Set Screw Shaft Collars manufactured in A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) are dimensioned to DIN 705 A. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose A2 Stainless Steel for Set Screw Shaft Collars
The most common stainless group for indoor and general outdoor fasteners. For set screw 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 Set Screw Shaft Collars in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For Set Screw Shaft Collars, the alternative stainless grade is A4 (316). The practical dividing line is chlorides: A2 (304) is fine until salt is involved, and A4 (316) exists for the cases where it is — coastal, marine and road-salt service. Neither reaches the strength of a plated class 8.8 or 10.9 fastener.
Using Stainless Fasteners in Aluminum
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Set Screw Shaft Collars Available in A2 Stainless Steel
| Size | Bore d1 (mm) | Outer diameter d2 (mm) | Width b (mm) | Set screw | Reference standard |
|---|---|---|---|---|---|
| 3 | 3 | 7 | 5 | M2 (ISO 4027) | DIN 705 A |
| 4 | 4 | 8 | 5 | M2.5 (ISO 4027) | DIN 705 A |
| 5 | 5 | 10 | 6 | M3 (ISO 4027) | DIN 705 A |
| 6 | 6 | 12 | 8 | M4 (ISO 4027) | DIN 705 A |
| 7 | 7 | 12 | 8 | M4 (ISO 4027) | DIN 705 A |
| 8 | 8 | 16 | 8 | M4 (ISO 4027) | DIN 705 A |
| 10 | 10 | 20 | 10 | M5 (ISO 4027) | DIN 705 A |
| 12 | 12 | 22 | 12 | M6 (ISO 4027) | DIN 705 A |
| 14 | 14 | 25 | 12 | M6 (ISO 4027) | DIN 705 A |
| 15 | 15 | 25 | 12 | M6 (ISO 4027) | DIN 705 A |
| 16 | 16 | 28 | 12 | M6 (ISO 4027) | DIN 705 A |
| 18 | 18 | 32 | 14 | M6 (ISO 4027) | DIN 705 A |
| 20 | 20 | 32 | 14 | M6 (ISO 4027) | DIN 705 A |
| 22 | 22 | 36 | 16 | M6 (ISO 4027) | DIN 705 A |
| 24 | 24 | 40 | 16 | M8 (ISO 4027) | DIN 705 A |
| 25 | 25 | 40 | 16 | M8 (ISO 4027) | DIN 705 A |
| 28 | 28 | 45 | 16 | M8 (ISO 4027) | DIN 705 A |
| 30 | 30 | 45 | 16 | M8 (ISO 4027) | DIN 705 A |
| 32 | 32 | 50 | 16 | M8 (ISO 4027) | DIN 705 A |
| 35 | 35 | 56 | 16 | M8 (ISO 4027) | DIN 705 A |
| 36 | 36 | 56 | 16 | M8 (ISO 4027) | DIN 705 A |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this shaft collar in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Dimensions, material, finish and form are specified from the drawing — a shaft collar outside the standard range is a variation on existing tooling rather than a new design. Made by thread turning or turning.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
