Description
93395A217 Hex Socket Countersunk Screw M3x30 316 Stainless DIN 7991 — BOLTON SKU 66879.
About the 93395A217 Hex Socket Countersunk Screw M3x30
DIN 7991 corresponds to EN ISO 10642 and covers hexagon socket countersunk head screws with a 90 degree head that seats flush in a matching countersink. This 93395a217 screw hex skt csk item is the M3 coarse-thread size at a 30 mm nominal length, which for an M3 countersunk screw is a long fastener: at that length it is intended to pass through a stack of plates, spacers or a gasketed cover before reaching the tapped hole or nut. The material is 316 stainless steel, the molybdenum-bearing austenitic grade that resists chlorides, salt water and most chemicals better than 304 and needs no plating. Because a countersunk head transfers load through a conical seat rather than a flat bearing face, the mating countersink angle and depth must match so that the head pulls down square and the joint clamps evenly.
Key specifications
| Part reference | 93395A217 |
|---|---|
| Type | Hexagon socket countersunk (flat) head screw |
| Standard | DIN 7991 (EN ISO 10642) |
| Head angle | 90 degrees |
| Thread | M3 × 0.5 (coarse) |
| Nominal length | 30 mm |
| Material | 316 stainless steel |
Typical applications
A 30 mm M3 countersunk screw suits assemblies where several thin layers – a faceplate, an insulating sheet and a mounting plate, for example – are drawn together and the head must finish flush with the outermost surface. Flush heads matter where a sliding part, a seal or a hand passes over the joint. The 316 material makes it a reasonable specification for marine, coastal and chemically exposed enclosures.
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