Standards
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175 / ISO 15156-2
- NORSOK M-650 Qualified
- API 6A Certified
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Incoloy 925 Pins (UNS N09925)
Dowel / cotter / clevis / spring / taper pins ASME B18.8.2 / DIN 7 / ISO 8734
Incoloy 925 pins (UNS N09925) are precision cylindrical or tapered fasteners used for alignment, joint assembly, retention and shear-load transfer. Distinct from bolts (which clamp via thread tension), pins transfer load through SHEAR across the pin cross-section and are typically retained by interference fit, cross-bolting, or a separate cotter / split-pin retention. The five common pin types each suit different applications: dowel pins (precision-fit alignment of mating components); cotter pins / split pins (retention of slotted nuts and clevis pins); clevis pins (pivot joints in linkages and lifting hardware); spring / roll pins (compression-fit retention in interference holes); and taper pins (precision-locked joints with a tapered hole + tapered pin). TorqBolt manufactures Incoloy 925 pins in M3 to M50 (1/8" to 2") sizes ASME B18.8.2 (inch) / DIN 7 (dowel) / DIN 94 (cotter) / DIN 1481 (spring) / DIN 1 (taper), in the solution-annealed and aged condition with hardness controlled within the 35 HRC NACE MR0175 sour-service cap.
Need Incoloy 925 pins? Email info@torqbolt.com with pin type, diameter × length, tolerance class, quantity. WhatsApp +91-22-66157017.
Pin Variants Manufactured
| Variant | Description | Standard | Use |
|---|---|---|---|
| Dowel pin (parallel) | Precision-ground cylindrical pin, h6 / h7 tolerance, slight chamfer both ends | ASME B18.8.2 / DIN 6325 (hardened) / DIN 7 (unhardened) | Precision alignment of mating components (jigs, fixtures, machinery) |
| Cotter pin (split pin) | U-shape wire bent for insertion through drilled hole; ends spread to retain | ASME B18.8.1 / DIN 94 / ISO 1234 | Retention of slotted / castle nuts; clevis pin retention |
| Clevis pin (with cotter hole) | Cylindrical pin with cross-drilled hole for cotter pin retention | ASME B18.8.1 / DIN 1444 / ISO 2341 | Pivot joints in linkages, lifting hardware, hinged assemblies |
| Spring pin (roll pin) | Hollow cylindrical pin formed from coiled / slotted strip; compression-fit | DIN 1481 / ISO 8752 / ASME B18.8.3 | Interference-fit retention; vibration-tolerant |
| Taper pin | Tapered cylindrical pin (1:48 or 1:50 taper); locks in matching tapered hole | DIN 1 / ISO 2339 / ASME B18.8.2 | Precision locked-position joints; high shear-load capacity |
| Grooved pin | Cylindrical pin with longitudinal grooves for compression-fit retention | DIN 1474 / ISO 8740 / ASME B18.8.2 | Permanent assembly; alternative to spring pin in solid section |
Standard Size Range
| Diameter | Dowel Tolerance | Length Range |
|---|---|---|
| 3 mm / 1/8" | m6 / h7 | 5 to 50 mm |
| 5 mm / 3/16" | m6 / h7 | 10 to 80 mm |
| 8 mm / 5/16" | m6 / h7 | 15 to 100 mm |
| 10 mm / 3/8" | m6 / h7 | 20 to 120 mm |
| 12 mm / 1/2" | m6 / h7 | 20 to 150 mm |
| 16 mm / 5/8" | m6 / h7 | 25 to 200 mm |
| 20 mm / 3/4" | m6 / h7 | 30 to 250 mm |
| 25 mm / 1" | m6 / h7 | 40 to 300 mm |
| 32 mm / 1-1/4" | m6 / h7 | 50 to 350 mm |
| 40 mm / 1-1/2" | m6 / h7 | 60 to 400 mm |
| 50 mm / 2" | m6 / h7 | 75 to 500 mm |
Mechanical Properties (Aged)
Tensile 165 ksi min / Yield 110 ksi min / Shear strength ~100 ksi (single-shear, calculated from UTS) / Hardness 32–35 HRC (NACE cap). For dowel pins requiring hardness above 35 HRC for wear resistance in NON-sour applications, omit the second age step to retain higher core hardness, specify "non-NACE high-hardness" at RFQ stage.
Standards
- ASTM B805, UNS N09925 input bar
- ASME B18.8.1, Clevis Pins and Cotter Pins (inch)
- ASME B18.8.2, Taper Pins, Dowel Pins, Straight Pins (inch)
- ASME B18.8.3, Spring Pins (inch)
- DIN 1 / ISO 2339, Taper pins
- DIN 7 / 6325, Dowel pins (unhardened / hardened)
- DIN 94 / ISO 1234, Cotter pins (split pins)
- DIN 1444 / ISO 2341, Clevis pins
- DIN 1481 / ISO 8752, Spring (roll) pins
- DIN 1474 / ISO 8740, Grooved pins
- NACE MR0175 / ISO 15156-3 Table A.10; EN 10204 3.1 / 3.2
Applications
- Sour-service rotating-machinery alignment (pump + compressor case-half registration)
- Wellhead-internal mechanism pivots (sour H₂S exposed)
- Valve-stem cross-pins for actuator-to-stem coupling
- Subsea connector alignment dowels
- Slotted-nut + castle-nut retention (cotter pin variant)
- Clevis pin in subsea mechanical-connector linkages (with retaining cotter)
- Spring-pin retention for sour-service rotating-shaft hardware
- Taper-pin precision joints in instrument valving
Manufacturing Sequence
- Bar input per ASTM B805 in annealed condition (round bar matched to pin diameter)
- Cut to length + face both ends
- Centerless grinding for dowel pins (h6 / h7 tolerance); turning for taper pins; coiling/stamping for spring pins
- Chamfer / radius end forms per applicable standard
- Solution anneal + age cycle per heat-treatment specification
- Cross-drill for clevis pins (cotter-hole feature)
- Final inspection: diameter Go/No-Go, length, end-form geometry, 100% hardness, sample tensile
- Bagged shipment with heat number on packaging (pins typically too small for individual stamping)
Frequently Asked Questions
Which pin type for which application? Dowel for precision alignment; cotter to retain slotted nuts; clevis for pivot joints; spring for vibration-tolerant interference fits; taper for high-shear precision joints. If unsure, describe the application and we'll recommend.
Why specify NACE-cap hardness for pins? Pins in sour-service equipment (wellhead internals, valve stems, subsea connectors) experience the same H₂S exposure as the surrounding components. Pins above 35 HRC can fail by SSC in sour brine. The 32–35 HRC cap applies to all sour-service pins; non-sour applications can specify higher hardness for wear.
Lead time? Standard dowel / cotter / clevis pins (M5 to M16): 4–6 weeks. Spring pins / taper pins / grooved pins: 6–8 weeks (specialty manufacture).
Documentation Package & Related Products
EN 10204 3.1 MTC (3.2 with TPI on request); chemistry, tensile, 100% hardness, dimensional + Go/No-Go inspection, NACE MR0175 reference. Related: hex nuts (cotter-pin retention companion), washers, bars, full datasheet.
Request a Quote
Email info@torqbolt.com · Phone +91-22-66157017 · WhatsApp +91-22-66157017. Specify pin type, diameter × length, tolerance class, dimensional standard (ASME B18.8.x / DIN / ISO), quantity, applicable standards, MTC level.
References: ASTM B805; ASME B18.8.1 / B18.8.2 / B18.8.3; DIN 1 / 7 / 94 / 1444 / 1474 / 1481 / 6325; ISO 1234 / 2339 / 2341 / 8740 / 8752; NACE MR0175 / ISO 15156-3 Table A.10; EN 10204. INCOLOY® is a registered trademark of Special Metals Corporation.
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