Description
Hex Socket Button Head Screw M4x8 A4 Stainless Steel — BOLTON SKU 57589.
About the Hex Socket Button Head Screw M4x8 A4
The Hex Socket Button Head Screw M4x8 is an M4 metric machine screw with an 8 mm nominal length in A4 stainless steel. A4 denotes the molybdenum-alloyed austenitic stainless family equivalent to the 316 group, giving better resistance to chloride-induced pitting than A2 (304-family) fasteners — the reason it is often called marine grade. The button head form is domed and low-profile, with an internal hexagon socket that accepts a standard hex key. The short length relative to the M4 diameter makes this a stub fixing for joints with limited depth. Specific property class, thread tolerance and documentation needs are confirmed when your request for quotation is reviewed. The socket drive also allows tightening in recessed or shrouded positions where an external spanner cannot swing, which suits the shallow joints this short length is bought for.
Key specifications
| Thread size | M4 |
|---|---|
| Nominal length | 8 mm |
| Head style | Button (low-profile domed) |
| Drive | Hexagon socket |
| Material | A4 stainless steel (316-family austenitic, molybdenum-bearing) |
Typical applications
An M4 x 8 button head is a typical fixing for sheet components onto tapped plates or inserts — control boxes, junction covers and light guards — where the joint is shallow and the head must remain unobtrusive. Its A4 grade holds up in washdown, offshore and coastal service where plated-steel screws stain or seize.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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