Spring Loaded
Test Pins
CNCPioneer produces pogo pin components, spring probes, PCB and ICT/FCT contacts, battery and charging probes, barrels, plungers, and custom test-pin parts for electronic fixtures. Swiss CNC turning, plunger-barrel control, spring-interface DFM, selective plating, low-burr finishing, and clean packaging support conductive alloys, stainless, tool steel, and more. Qualified features reach ±0.005mm diameter and ±0.010mm concentricity; quotes arrive in 24 hours.
What Are Spring Loaded
Test Pins?
Spring loaded test pins make temporary or repeated electrical contact with PCBs, pads, battery terminals, connector contacts, test coupons, and device surfaces. A typical pogo pin combines a plunger, barrel, internal spring, contact tip, and termination. It compresses during testing and returns to its free position with controlled force.
Performance depends on plunger and bore geometry, spring force, working stroke, tip profile, resistance, plating, alignment, wear, cleanliness, and fixture tolerance. Before production, CNCPioneer aligns the pin and fixture interface with the material, turning route, spring seat, finish, inspection, and packaging plan.
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Spring probe DFM for force, stroke, tip, barrel, and fixture alignment We review working force, length, stroke, overtravel, travel, spring seat, bore, tip, pad or terminal, alignment, wear, and test-cycle requirements before setting the machining route.
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Swiss CNC turning for miniature plungers and barrels Guide-bushing Swiss CNC supports small, stable pin components. CNC turning and MAZAK mill-turn centres produce larger probes, threaded pins, battery contacts, and fixture parts.
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Materials and finishes matched to electrical performance Brass, copper alloys, stainless, and tool steel are matched to conductivity, spring function, wear, corrosion, force, plating, and cycle requirements.
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24-hour quotes from a China factory Send a drawing, STEP file, sample, pad geometry, force, stroke, finish, cycle, and volume details. Quotes arrive within 24 hours, with DFM feedback in 48 hours.
Why CNCPioneer for
Spring Loaded Test Pins?
Our Swiss CNC and mill-turn platform combines conductive-alloy expertise, plunger and barrel DFM, selective finishing, force control, and clean packaging for test-fixture programmes. China production can provide a 40–60% cost advantage.
Plunger and Barrel Geometry for Repeatable Contact
Controlled plunger diameter, barrel bore, guide length, spring seat, tip, shoulder, and termination enable smooth movement and return. We review clearance, stroke, overtravel, alignment, tip radius, pad, retention, and assembly method. Qualified production can achieve ±0.005mm plunger or barrel capability with fixture-matched concentricity.
Force, Stroke, and Cycle-Life DFM
Test fixtures need reliable contact without damage to pads, joints, terminals, or device surfaces. We review free length, working force, spring rate, stroke, compression limit, cycle count, alignment, vibration, and pad finish, then align pin geometry with the spring specification and fixture tolerance.
PCB, ICT, FCT, Battery, and Functional Test
Our pins serve bed-of-nails, in-circuit, functional, boundary-scan, battery, connector, semiconductor, and end-of-line test systems. We define the pin, barrel, and termination around pad size, pitch, current, signal, cycle count, fixture plate, mounting, replacement, and clean handling.
Brass, Copper, Stainless, and Tool Steel Options
C36000 supports machinable plungers and barrels; C14500 balances conductivity and turning; C17200 serves resilient contacts; 303/304/316L supports corrosion-resistant mechanical parts; and tool steel suits high-wear fixtures. We match material, hardness, spring interface, resistance, finish, and service environment before production.
Gold, Nickel, Tin, and Silver Plating
Gold supports low-level signals; nickel provides a barrier and wear layer; tin suits solderable or low-resistance interfaces; and silver serves high-conductivity applications. We define thickness, resistance, cycles, wear, masking, dimensional allowance, spring movement, and post-plate inspection by zone.
Clean Packaging and Production Documentation
Programmes can include material and plating certificates, dimensional reports, specified force, stroke, or resistance records, RoHS/REACH, COC, PPAP, AS9102 FAIR, and lot traceability. Trays, tubes, reels, clean packs, and compartments protect assembled or unassembled components.
Spring Loaded Test Pins
Product Portfolio
We produce pogo pin plungers and barrels, spring probes, PCB, ICT/FCT, battery, connector, charging, threaded, and custom machined test-pin components.
Pogo Pin Plungers
Precision turned plungers and tips for PCB fixtures, spring probes, battery test, ICT/FCT, connector test, and production inspection. We control diameter, guide length, tip, profile, shoulder, groove, spring interface, stroke clearance, and plating area. Materials are selected for contact force and wear.
Pogo Pin Barrels
Machined barrels and spring housings with internal bores, spring seats, plunger guides, shoulders, flanges, and press-fit, threaded, or PCB mounts. We review barrel ID, roundness, wall thickness, clearance, compression, mounting, electrical path, finish, and assembly access. Small barrels suit guide-bushing Swiss CNC turning.
Spring Probes Test Pins
Spring probes and signal pins for connector validation, sensors, cable continuity, semiconductor handling, medical devices, and instrumentation. Fine diameters, low-force probes, high-cycle tips, guide sleeves, threaded bodies, PCB tails, solder interfaces, and selective plating are available. DFM covers resistance, force, cycles, burrs, cleanliness, and replacement access.
Industries & Applications
We support OEM programmes that require repeatable temporary contact, controlled force, low resistance, clean handling, and reliable replacement parts for test and inspection systems.
Automotive
IATF 16949 pins for automotive PCB tests, battery modules, charging systems, sensors, control units, harnesses, and end-of-line inspection. Programmes can include PPAP Level 3, specified resistance, force, stroke, and plating records, bar-coded packaging, and scheduled delivery.
Semiconductor
Spring probes, pogo pins, miniature plungers, barrels, and contacts for semiconductor handling, electronics validation, component tests, sockets, and production inspection. Small pitch, controlled force, gold plating, low resistance, clean surfaces, particle-conscious packaging, traceability, and material records are available.
Aerospace
Pins for industrial sensors, automation fixtures, robotics, machine vision, servo equipment, control systems, and production lines. We review vibration, force, travel, alignment, cycles, cable or PCB interface, finish, contamination, replacement access, and automatic handling.
Materials
Materials for Spring
Loaded Test Pins
Our material platform includes brass, high-conductivity and tellurium copper, beryllium copper, stainless, tool steel, phosphor bronze, and customer-specified materials. Selection follows force, conductivity, resistance, wear, spring function, corrosion, plating, test cycles, and volume.
C36000 Free-Machining Brass
C36000 supports efficient production of pins, plungers, barrels, PCB contacts, signal probes, and fixture components. It offers clean turning, stable dimensions, practical conductivity, and economical plating. We confirm plunger-barrel fit, spring seat, force, finish, burr control, wear, and cycle requirements before approval.
C11000 / C10200 Copper
C11000 or oxygen-free copper is selected for high-conductivity current paths and low resistance. We review machinability, chip and burr control, plunger contact, spring interface, finish, oxidation, heat, and storage protection. Solid or hollow plungers, sleeves, shoulders, and terminations are available.
C14500 Tellurium Copper
C14500 balances conductivity and machinability for plungers, barrels, contacts, charging probes, and power interfaces. It supports complex small features with practical chip control. We review current path, resistance, force, finish, corrosion, heat, cycles, and dimensional stability.
C17200 Beryllium Copper
C17200 is suited to resilient plungers, spring interfaces, high-cycle probes, and components requiring strength with conductivity. We define heat-treatment condition, machining sequence, hardness, force, finish, safety controls, and final inspection.
Phosphor Bronze and Special Copper Alloys
Phosphor bronze and special copper alloys serve spring interfaces, socket parts, resilient contacts, low-friction components, and corrosion-sensitive probes. Before quotation, we review conductivity, spring force, hardness, wear, cycles, finish, safety, and availability.
303 / 304 / 316L Stainless and Tool Steel
Stainless supports corrosion-resistant barrels, guide sleeves, fixture components, and mechanical probes; tool steel suits high-wear, high-cycle parts. 303 prioritises machinability, 304 general corrosion resistance, and 316L demanding chemical or marine exposure. Heat treatment, grinding, passivation, finish, and documentation are available for qualified programmes.
Surface Treatments for
Spring Loaded Test Pins
Finish selection follows contact resistance, force, test cycles, wear, corrosion, signal stability, current, and cleanliness. We define thickness, masking, dimensional allowance, movement, contact-zone protection, cleaning, and post-finish inspection before production.
Gold Plating for Signal and Low-Level Test Contacts
Gold can be selected for signal pads, fine-pitch electronics, instrumentation, semiconductor devices, and low-level interfaces. We define thickness, nickel underlayer, contact force, cycles, tip wear, selective plating, movement, and dimensional allowance.
Nickel Plating for Barrel and Contact Protection
Nickel provides a barrier, corrosion protection, wear resistance, and a stable base for barrels, plungers, and mechanical contact zones. We review thickness, movement, resistance, spring seat, masking, diameter growth, and post-plate inspection. It can separate contact and guide surfaces.
Tin Plating for Power and Low-Resistance Test Probes
Tin can support power contacts, battery probes, charging interfaces, solderable terminations, and low-resistance pins. We review thickness, contact wear, movement, masking, dimensional allowance, specified storage requirements, and post-plate fit.
Silver Plating for High-Conductivity Test Contacts
Silver is considered for high-conductivity pins, battery probes, busbar contacts, and specialised electrical fixtures. We review thickness, resistance, wear, anti-tarnish protection, selective plating, mating material, and packaging. Specified electrical records are available.
Low-Burr Deburring and Probe Cleaning
Pins need clean plungers, smooth tips, burr-free barrels, and unobstructed movement. The finishing plan can include precision deburring, brushing, washing, specified ultrasonic cleaning, drying, and visual inspection. Critical zones are protected through packaging.
Laser Marking and Clean Test-Pin Packaging
Part numbers, force codes, lot codes, orientation marks, clean trays, tubes, reels, sealed bags, or compartments can protect tips and prevent mixed lots. We review mark location, readability, protection, cleanliness, traceability, and receiving labels for fixture assembly.
Our DFM covers gold, nickel, tin, or silver plating; masking; deburring; cleaning; marking; specified force or resistance records; post-plate inspection; and clean packaging.
Quality System for
Spring Loaded Test Pins
Our IATF 16949 and AS9100D system controls four risks: plunger, barrel, and material identity; force and stroke stability; plating and cleanliness; and traceable documentation. It supports prototypes, fixture validation, and repeat production.
Material, Spring, and Test-Fixture DFM
Incoming brass, copper, stainless, tool steel, and special-alloy lots are checked against certificates and can receive alloy verification. DFM confirms plunger, barrel, spring, force, stroke, tip, pad or terminal, finish, test cycles, resistance, fixture alignment, assembly, and inspection before machining.
- Material and certificate review for brass, copper, bronze, stainless, steel, and special materials
- Force, stroke, overtravel, spring seat, pad size, alignment, cycles, and resistance reviewed
- Finish, masking, cleaning, dimensional allowance, and post-plate gauge plan defined
Swiss CNC and CNC Turning Plunger / Barrel Control
Swiss CNC, CNC lathes, and MAZAK mill-turn centres are selected by component size, material, spring interface, tip, volume, and tolerance. Small parts are supported close to the cut; larger probes, threaded bodies, and fixture parts use stable datums. Capability can include ±0.005mm diameter, ±0.010mm concentricity, controlled tips, and repeatable spring seats.
- Swiss CNC for miniature plungers, barrels, PCB probes, and spring contacts
- CNC turning and mill-turn for larger pins, threaded probes, features, and fixture bodies
- Specified first-piece optical, CMM, pin-gauge, bore, stroke, and finish inspection
100% Critical Geometry and Post-Plating Inspection
Pins are inspected to drawing for plunger and barrel dimensions, length, tip, spring seat, mounting features, concentricity, burrs, and finish. Specified post-plate checks cover thickness, contact area, appearance, dimensions, masking, movement, and mating fit. Force, stroke, resistance, cleanliness, and packaging can also be verified.
- 100% critical-dimension inspection for qualified programmes
- Specified post-plate diameter and contact-zone review
- Plunger movement, spring seat, tip, burr, cleanliness, force, stroke, and finish inspection
Documentation — Reports, Certificates, PPAP, and FAIR
Available documents include dimensional reports, material and plating certificates, alloy verification, specified force, stroke, or resistance records, finish readings, RoHS/REACH, COC, PPAP Level 3, and AS9102 FAIR. Lot traceability links material, machining, plating, inspection, cleaning, and packaging records.
- Dimensional report, material certificate, plating certificate, and COC available
- PPAP Level 3 for automotive, EV, battery, PCB, and high-volume programmes
- AS9102 FAIR for aerospace, medical, semiconductor, and precision-equipment programmes
Spring Loaded Test Pins FAQ
Answers for fixture engineers and buyers on drawings, force, stroke, materials, plating, prototypes, and production lead times.
Send a 2D drawing or STEP file with plunger and barrel dimensions, material, spring force, stroke, tip, pad or terminal, plating, resistance, cycles, mounting, quantity, and packaging. Without a drawing, a sample, fixture photos, pad geometry, force requirement, and annual usage can support a quote.
Force and stroke depend on the pad or terminal, target resistance, permitted pad load, fixture tolerance, alignment, cycle count, tip, and available compression. Too little force risks unstable contact; too much can damage pads or reduce probe life. DFM aligns force, length, stroke, overtravel, spring seat, movement, and fixture stack-up for the application.
C36000 brass is common for plungers and barrels; C14500 and C11000 support conductivity; C17200 and phosphor bronze support resilient interfaces; and stainless or tool steel suits guide and wear parts. Gold serves signal contacts, nickel barrier and wear, tin solderable or low-resistance interfaces, and silver high conductivity. The right combination follows force, stroke, resistance, wear, corrosion, cycles, and cost.
Simple turned plungers, barrels, or fixture parts typically take 5–8 business days after drawing confirmation and material availability. Plated, high-cycle, low-force, small-pitch, force-tested, clean-packaged, or documentation-heavy programmes commonly take 8–15 days. Volume lead time depends on material, cycle time, supply, inspection, packaging, and quantity. Most inquiries receive a 24-hour quote and 48-hour DFM.
Get a Quote for Spring Loaded Test Pins
Upload a drawing or 3D model with pad or terminal geometry, force and stroke requirements, material and plating notes, test cycles, cleanliness needs, quantity, or annual usage. Receive a quote within 24 hours and DFM feedback within 48 hours.