Material specification page for slotted headless screws with shank in A2 Stainless Steel. Covers the grade designation (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 2342.
Why Choose A2 Stainless Steel for Slotted Headless Screws with Shank
The most common stainless group for indoor and general outdoor fasteners. For slotted headless screws with shank, 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 Slotted Headless Screws with Shank 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 Slotted Headless Screws with Shank, 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 Slotted Headless Screws with Shank Available in A2 Stainless Steel
| Size | Pitch P (mm) | b (mm) | d_s_min (mm) | d_s_max (mm) | n_nom (mm) | n_min (mm) | n_max (mm) | t_min (mm) | t_max (mm) | x_max (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M1 | 0.25 | 1.2 | 0.86 | 1 | 0.2 | 0.26 | 0.4 | 0.63 | 0.78 | 0.6 | 2.5~4 | ISO 2342 |
| M1.2 | 0.25 | 1.4 | 1.06 | 1.2 | 0.25 | 0.31 | 0.45 | 0.63 | 0.79 | 0.6 | 3~5 | ISO 2342 |
| M1.6 | 0.35 | 1.9 | 1.46 | 1.6 | 0.3 | 0.36 | 0.5 | 0.88 | 1.06 | 0.9 | 4~6 | ISO 2342 |
| M2 | 0.4 | 2.4 | 1.86 | 2 | 0.3 | 0.36 | 0.5 | 1 | 1.2 | 1 | 5~8 | ISO 2342 |
| M2.5 | 0.45 | 3 | 2.36 | 2.5 | 0.4 | 0.46 | 0.6 | 1.1 | 1.33 | 1.1 | 5~10 | ISO 2342 |
| M3 | 0.5 | 3.6 | 2.86 | 3 | 0.5 | 0.56 | 0.7 | 1.25 | 1.5 | 1.25 | 6~12 | ISO 2342 |
| (M3.5) | 0.6 | 4.2 | 3.32 | 3.5 | 0.5 | 0.56 | 0.7 | 1.5 | 1.78 | 1.5 | ISO 2342 | |
| M4 | 0.7 | 4.8 | 3.82 | 4 | 0.6 | 0.66 | 0.8 | 1.75 | 2.05 | 1.75 | 8~14 | ISO 2342 |
| M5 | 0.8 | 6 | 4.82 | 5 | 0.8 | 0.86 | 1 | 2 | 2.35 | 2 | 10~20 | ISO 2342 |
| M6 | 1 | 7.2 | 5.82 | 6 | 1 | 1.06 | 1.2 | 2.5 | 2.9 | 2.5 | 12~25 | ISO 2342 |
| M8 | 1.25 | 9.6 | 7.78 | 8 | 1.2 | 1.26 | 1.51 | 3.1 | 3.6 | 3.2 | 14~30 | ISO 2342 |
| M10 | 1.5 | 12 | 9.78 | 10 | 1.6 | 1.66 | 1.91 | 3.75 | 4.25 | 3.8 | 16~35 | ISO 2342 |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Where the standard stops, the drawing takes over: fine pitches, left-hand threads, partial threading, and property classes above the catalogued grade where material and heat treatment allow. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
