A4 Stainless Steel Slotted Headless Screws with Shank are supplied to ISO 2342. The grade provides superior, including marine and chloride environments 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 A4 Stainless Steel for Slotted Headless Screws with Shank
Specified for marine, coastal and chemical applications. For slotted headless screws with shank, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Slotted Headless Screws with Shank in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless slotted headless screws with shank: (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
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 A4 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 A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
A4 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.
