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M3 x 20mm Flat Head Socket Screw, Stainless Steel 304
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M3 x 20mm Flat Head Socket Screw, Stainless Steel 304 — a M3 flat countersunk screw in Stainless Steel 304, driven with a hex socket.
Specifications
| Thread size | M3 |
|---|---|
| Thread pitch | 0.5 mm (coarse) |
| Length | 20 mm (0.787 in) |
| Outside diameter | 6.72 mm (0.265 in) |
| Head style | Flat Countersunk |
| Drive | Hex Socket |
| Thread configuration | N/A |
| Body shape | N/A |
| Material | Stainless Steel 304 |
| Finish | Plain |
| Strength grade / class | A2-70 |
| Standards | ISO 10642, DIN 7991 |
| Max continuous temperature | 400 °C (752 °F) |
| RoHS | Compliant |
| Unit weight | 1.23 g |
| Standard pack | 100 pcs |
| HTS classification | 7318.15.2000 |
Installation reference
- Clearance hole: 3.4 mm (0.134 in) — ISO 273 medium fit
- Tap drill for M3: 2.5 mm (0.098 in) at 75% thread engagement
- Hex key required: 2.0 mm
- Nearest imperial thread: #4-40 — similar in diameter but not interchangeable
About Stainless Steel 304
304 stainless resists general atmospheric and indoor corrosion and is non-magnetic in the annealed condition. It is not the right choice for salt spray or chloride exposure — 316 is. Stainless threads can gall under speed or load; back off the driver and use an anti-seize compound on repeated assemblies.
Related reference
- Fastener standards cross-reference: ASME, ISO and DIN
- Tap drill size chart — metric, UNC and UNF
- Metric to imperial fastener conversion
- Bolt head markings and grade chart
- All flat head socket screws
- All reference charts
Need a quantity, a length or a material that is not listed? Send us the specification and we will source it.