Spring Pin Manufacturer｜Elastic Locating Pins, Factory-Direct
Spring pins (elastic locating pins): the elastic deformation of the pin body provides interference self-centering location — smooth assembly, easy disassembly without damaging the hole wall, high repeatable positioning accuracy. Widely used for precision assembly locating, limiting and hinged structures. Multiple sizes in stock, non-standard customization supported.
Why Choose YF Zhichengjia Spring Pins
Elastic self-centering
Elastic deformation of pin body compensates hole-position tolerance with wide assembly window
Easy assembly/disassembly
Repeated assembly/disassembly without scratching the locating hole
Stable locating
Constant rebound force, high repeatable locating accuracy
Premium spring steel
Reliable elasticity and fatigue life
Vibration-proof, anti-drop-out
Continuous spring preload: no loosening under vibration
Full range of sizes
Common sizes in stock, fast sampling for non-standard
Spring Pins (3 models)
Elastic Locating Pin Gen-1 · M8 Thread-Mount Type
M8×1.25-6h external thread (hex drive) mounting, overall height 14.5±0.25mm; pin Ø2.5±0.025mm, protrusion 3.2~4mm, spring force 2~5N; zinc-nickel natural finish + precote 85-3 adhesive, grade 8.8, with airtight design (pressure drop <5Pa at 50kPa/2s) — dedicated to e-drive bearing outer-ring locking.
Elastic Locating Pin Gen-2 · Short Press-in Type
Threadless cylindrical press-in type, overall length 12.25±0.25mm; sleeve Ø3±0.05mm (42CrMo quenched 39~44HRC); pin Ø2.65±0.05mm with 20°±2° lead angle (SUJ2/GCr15, 50~54HRC); SUS304 spring 10±3N, protrusion after compression <1.1mm, oiled for rust protection — suited to small-bearing location and zero-clearance assembly.
Elastic Locating Pin Gen-3 · Long Press-in Type
Threadless cylindrical press-in type, overall length 12.25±0.25mm; sleeve Ø6.50±0.02mm (42CrMo quenched 39~44HRC); pin Ø3.80±0.03 / Ø3.95±0.05mm with 23° lead angle, 20MnCr5 carburized & quenched 58~62HRC (case 0.4~0.8mm) — first choice for heavy-duty bearing location, oiled for rust protection.
Gen-1/2/3 Elastic Locating Pin Comparison
| Item | Gen-1 · M8 Thread-Mount Type | Gen-2 · Short Press-in Type | Gen-3 · Long Press-in Type |
|---|---|---|---|
| Installation | M8×1.25-6h external thread, hex | Cylindrical press-in, threadless | Cylindrical press-in, threadless |
| Overall length / height | 14.5±0.25 mm | 12.25±0.25 mm | 12.25±0.25 mm |
| Sleeve outer diameter | — (thread-mount type) | Ø3±0.05 mm | Ø6.50±0.02 mm |
| Pin diameter | Ø2.5±0.025 mm | Ø2.65±0.05 mm | Ø3.80±0.03 / Ø3.95±0.05 mm |
| Pin lead angle | — | 20°±2° | 23° |
| Spring compression force | 2~5 N | 10±3 N | 10±3 N |
| Pin protrusion after compression | 3.2~4 mm (protrusion) | <1.1 mm | <1.1 mm |
| Pin hardness / material | HRC 22-32 | SUJ2(GCr15)，50~54HRC | 20MnCr5 carburized & quenched, 58~62HRC (case depth 0.4~0.8mm) |
| Sleeve material | — | 42CrMo, quenched 39~44HRC | 42CrMo, quenched 39~44HRC |
| Rear plug | — | 45#，250~320HV | 45# |
| Spring | — | SUS304 | SUS304 |
| Surface treatment | Zinc-nickel natural finish + precote 85-3 adhesive | Oiled for rust protection | Oiled for rust protection |
| Others | Grade 8.8; airtight design (pressure drop <5Pa at 50kPa/2s) | — | — |
| Typical Applications | NEV e-drive bearing outer-ring locking | Small-bearing location, zero-clearance assembly | Heavy-duty bearing location |
Note: specifications are subject to custom drawings and measured reports; customization to customer operating parameters is supported.
Spring Pin Selection Guide
1. Choose by locating accuracy
For structures demanding high locating accuracy and repeated assembly, prefer elastic locating pins; rigid pins suffice for one-time press fitting.
2. Choose by hole tolerance
With large hole-position machining tolerances, the compensating ability of spring pins significantly reduces assembly defect rates.
3. Choose by load
Joints under mainly shear load require double-shear verification; increase pin diameter or use twin pins if necessary.
4. Choose by material
Standard spring steel with black finish; stainless steel for humid environments; alternative materials negotiable for lightweight or non-magnetic applications.
5. Installation method
Press in parallel with matching tooling; avoid hammering, which tilts the pin body.
Typical Applications
Precision assembly locating
Locating pin holes for mold closing and housing mating
Automated production lines
Rapid locating and changeover of fixtures
Limiting structures
Stroke limiting and locking of sliding parts
Hinged connections
Hinged parts such as flip covers and swing arms
Motor assembly
End-cover locating and fixing
Electronic equipment
Rapid locating and fixing of internal structures
Spring Pins FAQ
Q1How to choose between elastic and rigid locating pins?
Choose spring pins for repeated assembly/disassembly, larger hole-position tolerances, or when the hole wall must not be damaged; choose rigid pins for heavy loads and permanent locating. The two can also be combined.
Q2How is the locating accuracy of spring pins guaranteed?
A constant spring force keeps the pin body uniformly against the hole wall; combined with hole-tolerance design, repeatable locating accuracy meets most precision assembly requirements.
Q3How much shear force can it take?
Shear capacity depends on pin diameter and material. Provide the load conditions and we will recommend a suitable size with verification data.
Q4What materials do you offer?
Normally premium spring steel (oiled for rust protection); stainless steel and other options available, material certificate supplied with delivery.
Q5In stock? What's the lead time?
Common sizes in stock; non-standard samples in 1-2 weeks; volume lead time assessed by quantity.
Q6Do you support non-standard customization?
Yes. Diameter, length, end forms and elastic-section structure can all be customized to drawing.
Need the full catalog or drawing-based custom spring pins?
Send specifications, drawings or application details for selection advice, test reports and a fast quote — direct to our sales lead.
