A2 Stainless Steel Two-Piece Clamp Shaft Collars are supplied to Trade series (two-piece clamp-type shaft collars). 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 Two-Piece Clamp Shaft Collars
The most common stainless group for indoor and general outdoor fasteners. For two-piece clamp shaft collars, 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 Two-Piece Clamp Shaft Collars 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 two-piece clamp shaft collars 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 Two-Piece Clamp Shaft Collars Available in A2 Stainless Steel
| Bore (mm) | Outside diameter (mm) | Width (mm) | Clamp screws |
|---|---|---|---|
| 8 | 24 | 12 | two M3 socket head cap screws |
| 10 | 28 | 13 | two M4 socket head cap screws |
| 12 | 30 | 13 | two M4 socket head cap screws |
| 15 | 36 | 15 | two M5 socket head cap screws |
| 16 | 38 | 15 | two M5 socket head cap screws |
| 20 | 45 | 17 | two M5 socket head cap screws |
| 25 | 50 | 17 | two M6 socket head cap screws |
| 30 | 60 | 19 | two M6 socket head cap screws |
| 35 | 65 | 19 | two M8 socket head cap screws |
| 40 | 70 | 21 | two M8 socket head cap screws |
