Description
Button Head Hexalobular Socket Screw M4 x 12, Steel Zinc Plated Class 8.8, Full Thread, BN — BOLTON SKU 53356.
About the Button Head Hexalobular Socket Screw M4
This fastener is a metric button head screw with an internal hexalobular (Torx-pattern) drive recess, supplied in M4 x 12 mm. The M4 thread runs at the ISO metric coarse pitch of 0.7 mm and is formed over the full shank length, so thread engagement is available across the whole grip. The low domed button head presents a shallow profile and a wide bearing face, spreading load over the joint surface and keeping the head close to flush where clearance above the panel is limited. The hexalobular recess seats the driver bit over a larger contact area than a comparable hexagon socket of the same size, which helps resist cam-out during powered assembly. The screw is carbon steel to property class 8.8 and zinc plated for general corrosion protection. Property class 8.8 denotes a nominal tensile strength of 800 MPa with a yield stress ratio of 0.8, giving a nominal yield of 640 MPa.
Key specifications
| Thread size | M4 × 0.7 (ISO metric coarse) |
|---|---|
| Nominal length | 12 mm |
| Head style | Button head |
| Drive | Internal hexalobular (Torx-pattern) socket |
| Thread coverage | Full thread |
| Material | Carbon steel |
| Property class | 8.8 (800 MPa nominal tensile strength) |
| Finish | Zinc plated |
Typical applications
Button head screws with a hexalobular recess are chosen where a fastener must sit close to flush on a visible or handled surface, and where powered drivers are used on repetitive assembly. At M4 x 12 the screw suits light bracketry, enclosure lids, panel and cover fixing, and mounting of sub-assemblies into tapped holes or nuts of a matching class. The zinc-plated class 8.8 specification places it in general mechanical assembly indoors or under cover, rather than in continuously wet or salt-laden service.
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).
Browse more in MIL-Spec & Coded Fasteners.
Reviews
There are no reviews yet.