Hexagon socket countersunk head screws ISO 10642 M4x8

Hexagon Socket Countersunk Head Screw M4x8 – ISO 10642

The M4x8 hexagon socket countersunk head screw to ISO 10642 (commonly referenced as DIN 7991) is designed for assemblies where a flush, snag-free surface matters. Thanks to its countersunk head, the screw sits neatly in a matching countersink, making it ideal for panels, covers, sliding parts, and clean-looking aluminium profile constructions. Manufactured from high-strength steel (property class 10.9) and zinc-plated for corrosion protection, it delivers reliable clamping force in compact builds.

Why choose a countersunk head?

• Flush finish: the head can sit level with the surface for a clean, professional look
• No protruding head: reduces the risk of catching on cables, clothing, or moving components
• Space-saving: useful where clearance is limited (covers, guards, tight frames)

Typical applications

• Machine covers, panels, and guards
• Aluminium profile constructions where a flat outer surface is required
• Automation, fixtures, and compact mechanical assemblies
• Projects where parts slide over or touch the fastened surface

Key specifications

• Size: M4 × 8 mm (metric thread; length measured overall for countersunk screws)
• Drive: Hex socket (for 2,5 mm Allen key)
• Material: Zinc-plated steel, property class 10.9
• Standard: ISO 10642 / DIN 7991

Dimensions (ISO 10642) – M4x8 (per drawing)

• l: 8 mm
• d_k max: 8,96 mm
• d_k min: 7,53 mm
• k max: 2,48 mm
• s (nom): 2,5 mm

Use with our aluminium T-slot profile connectors

Countersunk screws are especially useful in aluminium profile builds when you want a smooth outside surface—for example on panels, brackets, or plates mounted to a frame. Combine this M4 screw with our profile accessories such as:

• T-nuts / sliding nuts / hammer nuts (depending on your slot system) for fastening into the profile groove
• Plates and flat connectors where a flush head improves clearance and appearance
• Brackets and mounting plates for neat, low-profile assemblies

Quality & availability

We supply high-quality fasteners and aluminium profile accessories and keep a large stock available—so we can support both small DIY orders and large B2B projects with fast, reliable delivery from inventory.

Rendered hexagon socket countersunk head screw M4x8 (ISO 10642 / DIN 7991), zinc-plated steel Hexagon socket countersunk head screw M4x8 (ISO 10642 / DIN 7991) – dimensional drawing (l, dₖ, k, s, α)