A2 Stainless Steel Taper Pins with External Thread, Unhardened are supplied to ISO 8737. The grade provides good general corrosion resistance and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.
Why Choose A2 Stainless Steel for Taper Pins with External Thread, Unhardened
The most common stainless group for indoor and general outdoor fasteners. For taper pins with external thread, unhardened, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Taper Pins with External Thread, Unhardened in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Galvanic & Galling Considerations
For stainless taper pins with external thread, unhardened the compatibility question is galvanic rather than galling: joined to aluminum or galvanized steel in wet service, stainless drives corrosion of the less-noble metal. Isolate with a coating, sleeve or non-conductive washer where the joint sees moisture. Note also that stainless is softer than hardened carbon steel, so where the part carries a wear or shear duty, check the load against the grade before substituting.
Using Stainless Fasteners in Aluminum
Stainless steel is more noble than aluminum, so with an electrolyte present — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. Area ratio decides how bad it gets: a small stainless fastener in a large aluminum section is normally acceptable, a large stainless fastener in thin aluminum is not. Where the joint gets wet, isolate the metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.
Sizes of Taper Pins with External Thread, Unhardened Available in A2 Stainless Steel
| Nominal diameter d (mm) | d_1 (mm) | a (mm) | b (mm) | d_2 (mm) | Pitch P (mm) | d_3 (mm) | z (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| 5 mm | 5 | 2.4 | 14.8 | 5 | 0.8 | 3.375 | 1.375 | 40~50 | ISO 8737 |
| 6 mm | 6 | 3 | 19 | 6 | 1 | 3.85 | 1.625 | 45~60 | ISO 8737 |
| 8 mm | 8 | 4 | 23.25 | 8 | 1.25 | 5.35 | 2.125 | 55~75 | ISO 8737 |
| 10 mm | 10 | 4.5 | 25.5 | 10 | 1.5 | 6.8 | 2.625 | 65~100 | ISO 8737 |
| 12 mm | 12 | 5.3 | 28.75 | 12 | 1.75 | 8.3 | 3.125 | 85~120 | ISO 8737 |
| 16 mm | 16 | 6 | 37 | 16 | 2 | 11.75 | 4.15 | 100~160 | ISO 8737 |
| 20 mm | 20 | 6 | 37 | 16 | 2 | 11.75 | 4.15 | 120~190 | ISO 8737 |
| 25 mm | 25 | 7.5 | 42.5 | 20 | 2.5 | 14.75 | 5.15 | 140~250 | ISO 8737 |
| 30 mm | 30 | 9 | 49 | 24 | 3 | 17.75 | 6.15 | 160~280 | ISO 8737 |
| 40 mm | 40 | 10.5 | 61.5 | 30 | 3.5 | 22.75 | 7.25 | 190~320 | ISO 8737 |
| 50 mm | 50 | 12 | 74 | 36 | 4 | 27.75 | 9.2 | 220~400 | ISO 8737 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this pin in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Tolerance class is what a special pin usually turns on — a locating pin and a retaining pin want very different fits in the same nominal size. Made by cold heading or turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
