Mechanical properties, corrosion behaviour and the full dimensional range for this grade.
A4 Stainless Steel Hex Keys (Allen Keys) are supplied to ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80. Corrosion behaviour is superior, including marine and chloride environments, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is specified for marine, coastal and chemical applications.
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
A4 Stainless Steel is not a material hex keys (allen keys) are supplied in. Hex Keys (Allen Keys) are specified by nominal size, and this combination does not describe a part that exists.
See the Hex Keys (Allen Keys) product page for the specifications that do apply →
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
| Wrench size s (mm) | Common bolt sizes | Short leg (mm) | Long leg (mm) | Reference standard |
|---|---|---|---|---|
| 0.7 | M1 | 28 | 51 | ISO 2936 / DIN 911 |
| 0.9 | M1.1 | 28 | 56 | ISO 2936 / DIN 911 |
| 1.0 | M1.2 | 32 | 56 | ISO 2936 / DIN 911 |
| 1.3 | M1.6 | 36 | 63 | ISO 2936 / DIN 911 |
| 1.5 | M2 | 40 | 71 | ISO 2936 / DIN 911 |
| 2.0 | M2.5 | 50 | 90 | ISO 2936 / DIN 911 |
| 2.5 | M3 | 56 | 100 | ISO 2936 / DIN 911 |
| 3.0 | M4 | 63 | 112 | ISO 2936 / DIN 911 |
| 4.0 | M5 | 71 | 125 | ISO 2936 / DIN 911 |
| 5.0 | M6 | 80 | 140 | ISO 2936 / DIN 911 |
| 6.0 | M8 | 90 | 160 | ISO 2936 / DIN 911 |
| 7.0 | --- | 100 | 180 | ISO 2936 / DIN 911 |
| 8.0 | M10 | 112 | 200 | ISO 2936 / DIN 911 |
| 9.0 | --- | 112 | 200 | ISO 2936 / DIN 911 |
| 10.0 | M12 | 125 | 224 | ISO 2936 / DIN 911 |
| 12.0 | M14 | 140 | 250 | ISO 2936 / DIN 911 |
| 14.0 | M16 | 160 | 280 | ISO 2936 / DIN 911 |
| 17.0 | M20 | 180 | 315 | ISO 2936 / DIN 911 |
| 19.0 | M22 | 200 | 355 | ISO 2936 / DIN 911 |
| 22.0 | M24 | 224 | 400 | ISO 2936 / DIN 911 |
| 24.0 | M27 | 250 | 450 | ISO 2936 / DIN 911 |
| 27.0 | M30 | 280 | 500 | ISO 2936 / DIN 911 |
| 32.0 | M36 | 315 | 560 | ISO 2936 / DIN 911 |
| 36.0 | M42 | 355 | 630 | ISO 2936 / DIN 911 |
| 41.0 | M48 | 400 | 710 | ISO 2936 / DIN 911 |
| 46.0 | --- | 450 | 800 | ISO 2936 / DIN 911 |
| 50.0 | --- | 500 | 900 | ISO 2936 / DIN 911 |
| 55.0 | --- | 500 | 900 | ISO 2936 / DIN 911 |
| 60.0 | --- | 560 | 1000 | ISO 2936 / DIN 911 |
Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.
A4-80 Stainless Steel 316 DIN 7991 hex Socket Countersunk Machine Screws
Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
For Hex Keys (Allen Keys), A4 Stainless Steel suits general indoor and outdoor use; A2 (304) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.
Yes — stainless on stainless is prone to thread galling under load, especially at smaller sizes. Use an anti-galling lubricant or wax thread compound, and slow the tightening rate where possible.
A4 (316) is the standard food-contact stainless grade in most jurisdictions, particularly where chloride exposure (brines, dairy CIP) is present.
Yes, but stainless drives mild galvanic corrosion of aluminum in wet service — isolate with a coating, sleeve or paint, or accept the trade-off if the joint is dry and indoor.
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
