High-strength DIN7991 flat countersunk hex socket screws made from durable Grade 10.9 black steel. Available in M1.6, M2, M2.5, M3, M4, M5, M6, and M8 sizes, these Allen head bolts provide a flush finish for secure, professional fastening. Ideal for bicycles, automotive, machinery, electronics, furniture, DIY projects, and industrial applications. Precision-machined for excellent strength, wear resistance, and long-lasting performance.

There are 5/10/50pcs hex socket flat countersunk head bolt

Item Description

Material: 10.9 grade steel

Size: d(thread diameter) x L(total length)

Metric thread diameter:

M1.6 (1.6mm) / M2(2mm) / M2.5(2.5mm) / M3(3mm) / M4(4mm) / M5(5mm) / M6(6mm) / M8(8mm)

Metric thread pitch:

0.35mm (M1.6) / 0.4mm(M2) / 0.45(M2.5) / 0.5mm(M3) / 0.7mm(M4) / 0.8mm(M5) / 1mm(M6) / 1.25mm(M8)

Thread length: 3mm-80mm