Standard housing materials and spring. 520 park east blvd, new albany, in 47150 phone: 812-944-6733 fax: 812-948-5047 e-mail info@samtec. The BON Plate also contains two sheet metal side brackets for wired connector mounting. 1mm off from nominal location:. 033. Also available is our unique, low-profile, compliant body socket receptacle, capable of press-fitting into . 2mm PCB Mounting Pin (PNL18) From £0. Dissolved copper in the chemical bath will be drawn to the negative charge and adhere. 150” (P15) (P15AD). In Altium Footprint Designer, under File → New → Library → PCB Library. Users expect an electronic device to power on and function flawlessly, but designers know how much work goes into. Choose from our selection of retractable pins, including over 500 products in a wide range of styles and sizes. If you do have silk screen on the PCB, then draw a flat on the cathode side which would correspond to the flat on the actual part. Note: In the rare case a connector is not available without alignment pins, the drill holes should be . 047"), 1mm (. You could drill out the jig holes for greater clearance to make the second way easier on alignment. MISUMI USA has all of your Contact Probes needs covered, with over 3. They are often used with a round pin to provide multi-axis alignment. SMDs are preferably packed in tapes/reels. PCB solder pins are, however, one of the most commonly used PCB pins where the connectors are soldered onto the. Drift pins have a tapered end that are placed. 1-inch female or male headers in most conventional PCBs. 039"), 1. These pins assist in hand placement and can be used to polarize the connector to the PCB, and for single connector applications, they don’t contribute to the overall tolerance stack. 8 Pin 21-033733-002 PCB 2 tails For epoxy filled connector 8 Pin 21-033733-004 PCB 2 tails For epoxy filled connector 8 Pin 21-033733-005 PCB 4 outer tails, 1 inner2. 250” (P25) (P25AD). You should also drill alignment holes for larger pins in the bed of nails that will mate with whatever mounting holes you have on the PCB. 4mm to. You can find at least one hundred different circuits that fit on a QFN-16. Electrical and manufacturability concerns with PCB component orientation. Tooling holes should be 1. 1 Advantages of Hotswap PCB. The present study proposed an. If I can pass the bootstrap (9th) track. 00mm pin header and sockets. 50 watt @ 70°C. Components are positioned on the board to not only satisfy the electrical requirements defined by the connective and signal integrity requirements, they must also be placed during the. Board to board connectors are available in 0. Dowel Pin Stock. But don't try to clip multiple leads at the same time- that can put excessive force on the joints. Service Class, Aluminum 175ºC DT Durmalon: Plated alternative to cadmium, corrosion resistant, 500 hrs. they are pretty cheap… 2. When adding tooling holes, please keep the following in mind: 1. Invoke ^Show Element. 5mm. These pins assist in hand placement and can be used to polarize the connector to the PCB, and for single connector applications, they don’t contribute to the overall tolerance stack. 25mm) They are small pads used for PCB alignment during automatic assembly. The main idea behind this process is to ensure that when you turn your board around to mill the bottom side of your PCB it will be perfectly aligned with the top side. AUTOMATION & IIOT. We offer a wide array of reliable and cost-effective products from standard solutions to custom designs. So, as the snap step changes in size, the fine grid changes by the exact same amount, and the coarse snap grid changes by a multiple amount. These 0. With my “street-cred” at stake, I chose to incorporate a mechanical adjustment into the board holder by means of. Slotted Bushings. 041" to . 5. 1. AOI (Automated Optical Inspection) Equipment can easily inspect Pin Tip True Position measurements but is challenged to detect presence of a pin tail buried in a thick PCB PTH. Note: The recommended pin hole dimension of the sen-sor is 0. Figure 5: The hole used for PCB positioning in pallet. Measure the diameter of the pin. Alignment using pins Diameter measurement. The chemical tin solution might be harder to find and can be quite expensive (about 50 bucks for a bottle), but is completely optional. We carry these pogo pins in the Adafruit shop!mechanisms. Electrical Connection. 57 mm of space between. Because fiducials serve as the reference position during PCB assembly, it is critical for OEMs to be able to extract and locate them accurately and repeatedly. These pins assist in hand placement and can be used to polarize the connector to the PCB, and for single connector applications, they don’t contribute to the overall tolerance stack. The sleeve for a P75 pin for example is an R75. The Raise workpieces and position them on a fixture plate. My pin was 0. Anyway, here are eight tips, thoughts, suggestions, and ideas, on how to process multiple connectors on a board, where the connectors need to be mated simultaneously. Reject if pins are bent or defective. Recommended PCB mechanical cutouts and spacing Assembly Recommendation 1. Alignment Pins. Pieces are aligned by installing a pin in one part and a liner in the other. 2-side PCB. 82 £9. The 14-pin JTAG header on a PCB, JTAG pads without holes, no other holes on PCB around JTAG connection area. With this. g. Reworkable surface for manufacturers who want to press-fit pin inserts into the PCB. A pair of alignment bodies, each having a generally planar, elongated shape and preferably formed of plastic, each have a plurality of alignment holes formed therein, wherein each alignment hole is allocated to a. A fine grid is displayed which directly relates to the current snap grid setting. Unplated slots for edge mount connectors. 53 products. Six 3mm notches are placed 1-inch on center along the long edges of the board that will mate with indexing pins in the aluminum carrier. But this is what an excellent PCB design engineer should do. Eg. These are holes on your board and on the milling machine bed (typically a board of wood. The lay-up operator has already placed a copper foil and 2 sheets of prepreg on the heavy steel baseplate. Bed-of-Nails-style test fixtures provide precise alignment to the UUT to test points or connectors of choice, even in. Additional customising parts. J0/P0 Pin/Signal Description Vs1 High Voltage Power Input 1 Voltage specified in VITA 65. This way the DUT PCB can "fall" into the slot before it "meets" the test pogo pins. Stepped tails or PCB tails with an increased diameter on a designated portion may be required for certain applications. The DUT can be held down by a clamp (the normal ones used. Pcb Alignment Pins (20 products available) DJ7031Y-2. 3,555 products. PCB Stack-Up 51 6. 4. Besides getting the alignment right, you must ensure that no high profile components. PCB Solutions is a printed circuit board manufacturer providing printed circuit boards, assemblies, connectivity solutions and enclosures for the dynamic electronics industry. Weld in place for greater rigidity and strength than other pins. did not provide the recommended hole size. 2 further defines acceptance criteria for proper compliant pin termination. If you need 20 pins, use a 2 X 10 connector instead of a 1 X 20. These units are 0. This will add a new PCB component footprint library to your project. Key Takeaways. Learn the design steps for creating your own custom inclinometer PCB. 85mm is fine for a 3mm. Comparing the Gerbers might be worthwile. Avoiding the use of the alignment pin option (typically shown as "-A" in the part call out), to minimize the impact on the alignment tolerance analysis. 635mm MEC6 series PCB micro edge card sockets with standard PCB alignment pins and a double row design that accepts up to 140 gold plated contacts. The multifunction decoder module carries a female socket. coplanarity, soldering, and board-to-board or connector-to-connector alignment. Active . In my PCB design, I'm pulling out a track from the 8th pin which is the pin to connect the source of a FET as in the figure below. Shear Pins. Pair with a standard bushing to prevent alignment pins from binding in your fixture. 3. These units are 0. Just because a “rule of thumb” is usually based on experience instead of. The CNC-controlled process ensures precise hole alignment, making it suitable for high-volume production where consistency is critical. Tooling holes are not the same as mounting holes, and they are necessary for securing a board to a work table during manufacturing. Finally, insert the conductive protrusions of the 1st board into the 2nd board, and solder. 6. GD100 Ground Hollow Dowel reduce weight by over 50% as compared to the same size Solid Dowel. It has numerous pins inserted into holes in an epoxy phenolic glass cloth laminated sheet (G-10) which are aligned using tooling pins to make contact with test points on a printed circuit board and are also connected to a measuring unit by wires. Routing Fixture is specially developed for the PCB Routing Machine, using high strength Aluminium alloy sheet with Top Cover to ensure that PCB alignment and position of router bit as per the requirement. 8 x 1. This guideline applies to other types of polarized. Carefully thread the end of the pencil over the bent pin, like an arm through a sleeve, so that the pin slides into the pencil's empty nib. Make it deep enough so that you can put alignment pins in there later. A PCB 2D/3D component model represents the physical component in the PCB domain. Check. Description: Non-Concentric Design Reduces Capacitances and Eliminates the Need for an Electrostatic Shield Precision Pin Alignment for Easy Drop-In Installation. You are not actually supposed to solder to pogo pins, but rather insert them in sleeves. 05 mm) tolerance and 2 mil larger than the maximum peg. 1-8 layer Pcb Prototype Fabrication Manufacturer And Assembly In China. At this point, user-specified, discrete components—capacitors, resistors, etc. 157 products. Ensure headers maintain position during solder processing and proper alignment to PCB; Allow for 260ºC wave and reflow solder processing; Ditto Power Connectors. 090” (2. However, if the pin is short and the PCB is thick, the pin is not visible thus limiting defect detection. Two or three tooling holes should be added on the PCB, they should be placed in opposite corners of the PCB and as far apart from one another as practical. A bed of nails tester is a traditional electronic test fixture used for in-circuit testing. Different customers may have different module designs, but provisions should be made for alignment features to assure precise location and orientation of the module in the test socket. 25mm)They are small pads used for PCB alignment during automatic assembly. 0mm and PCB alignment pins; 10. 50mm and 0. In this month’s column, I will discuss optical alignment for pinless lamination stackup, a topic that complements the induction lamination in my November 2021 column. There were two capacitors, one near the pins 7 and 20. 2 amp per pin current rating, and gold plating on all components. 5 to 6mm,. You could drill out the jig holes for greater clearance to make the second way easier on alignment. Applications. com, or call us toll-free at 1-888-812-1949. They are made of aluminum, beryllium copper, metal, nylon, plastic, polybutylene, polycarbonate, polyphenylene, polystyrene, stainless steel, and zinc. Right-click in the workspace then choose the Align » Align command from the context menu. It's easier if you have a jig that can hold the pins while you solder. I'm sorry. this way i was able to test 100% of alignment: mount holes + connector pins !! marvelous , board arrived , NO SURPRISES !!!!! i slept like a. I am designing a circuit using an IC, LTC7004, which is a high-side MOSFET driver. relies on several toggle and pneumatic presses to press-fit pins and connectors into PCBs of all sizes and shapes. Putting a good PCB plan on "paper" starts with having the right overall product goals, market/customer insight and target specifications. 2 products. The PCB pins can legitimately be referred to as the foundation of every PCB design. Laser cut the stainless steel foil to create an opening for each surface-mounted device on the board. For CPU Pins Bent Flat. For plastics, you can still use locating pins with a sliding fit and snap. Individual SMT Spring Loaded Pogo Pin with Peg, 8. to determine whether the Designator for the pin is displayed or hidden (respectively) when the parent part is placed on a schematic sheet. Objects are carefully placed to fulfill their mechanical and electronic requirements. Locating pegs are particularly useful when using surface mount components. Name each component, wire, and net as per a. If I chose to use simple digital calibration as the datasheet suggests, I might lose the nickname “Hard-way Hughes” around the office. Pin insertion is also a cost-effective and automatable means of delivering signal or power to your PCB. Line up holes in sheet metal, I-beams, and angle irons for bolting, riveting, and welding. After cleaning, the laminate boards are ready for layer alignment. This pin number may be a number, letter, or any combination (the pin numbers on diodes are usually "A" and "K"). 157 products. I'm a bot, bleep, bloop. 1mm; Check F. 800. 1. Step Six: Layer Alignment. Each pair of PCBs would be connected by two connectors for mechanical stability. Press-fit PCB Pins for Plated Through-Holes. PCB Test Point, Pin, Multicomp Colour Coded Through-hole PCB Test Pins, Red, Through Hole Mount. 1mm hole size on the PCB. Arrange components neatly with digital parts on left and analog parts on right. Staplers & Staples Hole Punches Scissors Clips, Pins & Tacks Rubber Bands Rubber Stamps & Stampers Rulers & Measuring Tape Desk Pads Desk Organizers Rolodex. In this scenario, even if there is plenty of board area for the circuitry, the board edge dimensions are more critical, and the tolerance will have to be reduced to make sure the board fits properly. The PCB footprint simply has test-pads that connect with the pogo-pins and holes that allow for a rock solid connection. Phone: 781-935-9066. The best alignment method for PCB fabrication is still the humble tooling hole. Pitch (mm): Mated Height (mm): Circuits: Current (MAX): 2. Overall height refers to the length of the pin, from is barbed tip to the top of its flat head. 00. 6mm x 1. Solder paste is a gray-colored goo made from a mixture of tiny particles of metal alloys; usually of tin, lead and silver. Locating pegs (also referred to as locating posts, alignment pins or board locks) are used to assist alignment of connectors to the PCB. passive alignment onto a PCB of any opti cal or opto-. Alignment Pins. X-pins with the poka-yoke ensure the proper alignment 2. Line up holes in sheet metal, I-beams, and angle irons for bolting, riveting, and welding. This helps our customers reduce operational costs and complete their projects on time with complete. Sorry to post this as an issue, but I'm having trouble to understand how to align for double sided pcbs. Pre-preg is applied between the layers of substrate and copper foil as an adhesive before applying heat and. Search our portfolio of products and select your specifications. The invention discloses an expanding-collapsing-type PCB alignment pin mechanism. post size reduces too, one reason for lower current carrying capability of smaller pitch PCB connectors. 3. Here are the four main areas of PCB layout that should be considered for EMI prevention: Board Layer Stackup. Quote Reply Topic: Alignment pins/Mounting holes Posted: 10 Apr 2017 at 12:13pm: I'm curious if there are any guidelines for symbols and footprints for parts (typically connectors) with alignment and/or mounting pins. A dowel pin will be more than accurate enough for this. During lay-up, pins are used to fix the layers in position and ensure the stack remains in alignment prior to pressing. Some designs also have quality control patterns to measure soldering and etching processes. 4mm Pitch Centerline Mating Height: 0. Amphenol offers various floating board-to board connectors in 0. In this case, the designer will have a simpler way of debugging a circuit. Insert one end of the flatflex cable into the connector on the main PCB. Ball lock pins, quarter turn fasteners, sliding lock, spring plungers, retractable indexing plungers and more are all available. A sandwich jig, for example, is made with two individual plates. Compact, powerful, and easy-to-use vision sensors for robot and stage alignment applications. Fasten or remove components on equipment with a spring-loaded retaining ball or built-in magnet. Prepare cooling system with the sealing ring. Drawbacks The finish can oxidize. The optical punch drives a pin down through the holes to line up the layers of the PCB. 98mm Current Rating: 0. Photo courtesy Würth Elektronik ICS Inc. The. These can often most easily be sourced by doing a search on the part number, for example a P75 pogo uses. (See Figure 7) The PCB and connector assembly should be inspected from the back side of the PCB to ensure that the pin has properly entered the PCB and not buckled. Re: Home made two sided PCBs alignment techniques. The socket “grabs” the pins, further straightening them. The number of layers used for a PCB depends on the application, the operating frequencies, pin density, and the requirement for signal layers. 82 10+ £5. By Jim Camillo. To do this, select the Group tool on the left-hand side of your interface. Alignment pins, kapton pads, pick and place pads, end shrouds, etc. . Robust reflow processing, due to higher pitch (1. SMD and Through Hole. The pins featured in the table above are often used in applications with more demanding mechanical/electrical requirements such as power supplies, power converters and any device subject to blind mating or rough handling. 54 - 5. With a two-layer stack-up, the top layer—or layer 1—works as a signal layer. Weld in place for greater rigidity and strength than other pins. Common or singulated ground: Optimizes connector for power and slow-speed, single-ended signals in addition to high-speed differential circuits. Weld Pins. 08mm pitch sizes, this single-row, wire-to-board and board-to-board product family is cost effective and versatile. Contact in socket allows long terminal strip pin to pass-through socket and PCB to another socket; Saves space, routing flexibility, fewer connectors; Also allows bottom-entry board stacking. The grid lines are usually turned on by default on the layout but if you’re seeing a blank design sheet, you’ll need to manually turn on the grid. The 2D footprint may include such items as pads for connecting to the pins of a device, a physical outline of the package and device mounting features. If you’re looking for terminal pins for board-to-board connection, the header pins are the right choice. 157 products. Choose from our selection of alignment fixture pins, including mating locating pins and hole liners, threaded locating pins, and more. Capability per VITA 46. Highlight all GND pins on a particular component (All Levels) onsider using the ^Find by Query _ function to locate elements based on qualifiers. Objects are carefully placed to fulfill their mechanical and electronic requirements. 312” to 48. A mounting plane assembly (e. It may be difficult to line up a large number of pins all at the same time. PNL - Valcon Nylon 8mm PCB Mounting Pin (PNL8) From £0. The pins can be either solid (rolled or stamped) or flat. Restricted Item. 200" in from any edge. Featuring a configurable head length in 0. 05mm: Total: 0. TheseExport your OrCAD PCB outline and drill holes as a DXF drawing;. 6. 635mm MEC6 series PCB micro edge card sockets with standard PCB alignment pins and a double row design that accepts up to 140 gold plated contacts. The result is a compound screw whose effective pitch is the. 16 inch (see sheet 6). Guides - used to toggle whether the cursor will snap to manually placed linear or point Snap Guides. 100" grid standard. 85mm is fine for a 3mm. The pins elevate the module, giving clearance underneathIn addition, the following characteristics define a fine pitch PCB: The screw terminal features 2. 152mm (45. 6 mm) and contains spring-loaded pins featuring . MISUMI USA has all of your Contact Probes needs covered,. VERSATILE • Variety of tail and standoff lengths • Custom extended lengths available • Choice of finishes FLEXIBLE • Contacts available alone or assembled in connectors Mill-Max is expanding its range of SMT pins with the introduction of three new series featuring the Sure-Hold grooved base design. 020"(0,3mm - 0,51mm) component leads. Weld Pins. Spring Locating Pins. Dowel pins press fit is solid pins, typically precise, with limitations of precise fit; they are typically used to keep the pieces in PCB to a set alignment, depending on the strength of fit to remain in place. The ideal pin for our pick-and-place process has the following properties: Comes in a housed array (ideally in dual-row, 2×2 or greater, for best for vertical alignment and stability) Through-hole (either the pins have a ‘tail’ or they have housing that has alignment pins) Proportionally ‘short. In Altium Designer's PCB editor, the process of how you define any multi-sided polygonal object, such as a solid region, the board shape or a polygon, is the. Access Align Objects Dialog (from Active Bar) Click to Expand. If you are involved in PCB layout, then you are already familiar with single-ended signaling, even if you haven’t heard that exact term used before. 5” FFC takes multiple capacitive-touch lines from the microcontroller to an exterior control panel that is not yet designed. I need to align two flat surfaced components, say pcb to chassis, and want to control the alignment of said components as tight as possible prior to installing fasterner hardware. Each pin has four channels machined into the SMT base providing excellent solder flow and ensuring a secure soldered connection. The alternative, rigid boards using flexible cable and connectors between them, is also based on quotes from PCB fabricators. Attach power module with PCB to the prepared cooling system. pins, tooling pins which align the PCB under test, and two 1/2" Stainless Steel guide pins which provide alignment for the Turcite Bushed Press Plate. The most significant advantage of using a hotswap PCB is the ease of switch installation, making it ideal for beginners. If you still find yourself with any questions about proper alignment, or to send in the PCB Design Files for your PCB project today, please feel free to Contact Us any time! You can reach us over email at [email protected]" x . Stac64 Hybrid Header, 14 Circuits, Right-Angle, Polarization B, Mylar Pin Alignment Plate, Gray, TrayThe invention discloses a device for automatic hole digging and detection after PCB punching. Maximum Secondary Current Rating: 0. 177 products. To achieve perfect alignment of all films, registration holes should be punched through all films. Laser drilling and scribing is used to manufacture a variety of electronic hardware and components. Here’s another important tip–use only one press fit pin and make the second pin a sliding fit for alignment only. Each pair of PCBs would be connected by two connectors for mechanical stability. Regardless of the quantity, they should be pushed out towards the corners (if there are corners) to make it easy to line up the pins and holes each time. The ProtoProg does not need a physical connector on the board, it uses surface-mount pads for signals and thru-holes for alignment. 635mm MEC6 series micro edge card socket connectors are available as PCB vertical mount and PCB Contact Pitch: 0. SMDs have very short pins and are surface-mounted on PCBs, while THT components have long pins, and their pins insert through the PCB holes and are soldered with the wall of the PCB holes. 154 products. A pushing pin penetrates into the through hole. 0mm connectors can withstand the solder process up to 280°C (IR Reflow) or 250°C (Wave Solder), with LCP or Nylon 6T, have an operating temperature of -40°C to + 105°C and have a current rating of 2 amps per circuit. 5" long and have a spear point. Mechanical alignment tools, such as pins and alignment jigs, can be employed to manually align layers before lamination. View Details. A good foundation for your PCB starts in the library. 2. The first step in PCB assembly is the application of solder paste onto the board. Tooling holes are also used during the testing process if the board needs additional test fixture support. 050"), 2mm (. I can tell you that the "Align components" won't work because it's only meant to work on components as a whole. One useful approach is to drill twin holes into mating parts, and then use a pin or dowel. Pin and receptacle shells are machined from brass alloy, for strength, conductive and thermal properties. 8mm pitch ICs, this method can be used for alignment, but for narrow pitch pads such as 0. The project uses a 32bit Microchip MCU to control the automatic testing process. 563 2 8 17. PCB alignment. 3D view of vias in a high-speed design. NOTE 1: Each of the two boards will be mechanically bound using screws to the. Flexible terminal strips and board stackers. 2. PCB Headers and Receptacles. The holes from earlier are used to align the inner and outer layers. They are typically staked into a PCB at the press-fit end and either soldered or plugged in at the pin end. 1mm pin. If the PCB is not kept still, it will be impossible. Tooling holes on the PCB should be as far apart as possible, diagonally placed, with a tolerance between holes of ±0. Summary Alignment Pins. Recommended PCB mechanical cutouts. Floating connectors come with built-in guide posts enabling self-alignment and ensure a secure connection with proper retention of pins in uneven surfaces. Line up holes in sheet metal, I-beams, and angle irons for bolting, riveting, and welding. 024. rigid PCB-and-cable assembly and a 3D rigid-flex design. 57 mm of space between. Align Left Click to Expand. Data will be taken from the board via the USB to UART interface. For the ATmega164, with p = 0. The BGA pin pads are spaced according to the size and number of pins for the device in pitches from 1. Shrinkage (typically a couple of percent in linear dimensions, first-order. Anyway, here are eight tips, thoughts, suggestions, and ideas, on how to process multiple connectors on a board, where the connectors need to be mated simultaneously. PCB support pins. Components placed on a printed circuit board, as viewed in a 3D PCB design system. 35 mm, this means we have 0. Solder In Header Pins. Avoiding the use of the alignment pin option (typically shown as "-A" in the part call out), to minimize the impact on the alignment tolerance analysis. Flexible PCB and lower support tool equipped with pin presence check support for enhanced productivity; Real-time force monitoring for 100% quality assurance (maximum force and force vs. As the pin is driven through the holes the pieces become aligned, allowing for bolting or. Place the components of a power supply as close together as possible. Maximum. Follow these steps to hand solder headers to a PCB: 1. CT 3-D PCB stack belong to what layer on a physical PCB in an automated, generalizable, and completely unsupervised fashion. MISUMI Locating Pins are available in a vast array of styles to meet most automation applications. Location bushes, standard drill bushes, or slotted bushes can be used as a location system with location pins and alignment pins. PNL - Valcon Nylon 16. 007 inches. Foil Lamination of a 6-Layer PCB Foil lamination involves processing one less detail (pair of layers on a piece of laminate) than that done with cap lamination. Types of standard alignment pin handle styles include: T pins, L pins, convertible handle. The pins featured in the table above are often used in applications with more demanding mechanical/electrical requirements such as power supplies, power converters and any device subject to blind mating or. Place a pad. 2. Fasten or remove components on equipment with a spring-loaded retaining ball or built-in magnet. PCB Adapter, ITA, QuadraPaddle, 192 Position, to PCB-Mounted 2x68 Pin Female SCSI Connector 510109591 PCB Adapter, ITA, QuadraPaddle, 192 Position, to PCB-Mounted 2x96 Male SCSI ConnectorSearch our portfolio of D-Sub Connectors products and select your specifications. QFP32, QFP64, etc. Shrouded, skyscraper and low profile. com. We report a complete deep-learning framework using a single-step object detection model in order to quickly and accurately detect and classify the types of manufacturing defects present on Printed. $endgroup$ – Scott Seidman. Press-fit or compliant-pin terminal design: Easy board termination using flat-rock tooling. 9mm in diameter. 4. 050”) pitch. The locating pin is at 9 o'clock. The PCB assembly to be tested is placed on 4 guides and above a bed of pogo pins. These 0.