This product is an M4 x 75 mm hexagon-head bolt designed to be driven with a 10 mm hex bit or socket. Its primary use is for securing assemblies where a compact M4 thread is required together with the convenience and torque control of a 10 mm external hex drive, such as light engineering, control cabinets and maintenance work where a repeatable, positive drive is needed.

The fastener features a metric coarse thread M4 with a standard pitch of 0.7 mm and a nominal length of 75 mm. It is supplied as a hex head type with a 10 mm external hex drive, compatible with common sockets and ring spanners. The dimensions and thread form comply with ISO metric thread standards (ISO 68‑1/ISO 261) and the bolt is manufactured to the usual hex-bolt profiles broadly equivalent to ISO 4017 / DIN 933 for fully threaded hex bolts. Material grade offered is typically grade 8.8 carbon steel for general engineering use; stainless options (A2-70 or A4-70) are available where enhanced corrosion resistance is required.

The standard finish is clear zinc plating with passivation to provide sacrificial corrosion protection for indoor and light outdoor environments. For demanding or marine applications choose A2 (stainless) for good corrosion resistance or A4 (marine-grade stainless) for the highest resistance to saltwater and aggressive atmospheres. Grade 8.8 provides a reliable strength class (nominal tensile strength ~800 MPa), making the bolt suitable for assemblies that require moderate structural strength while remaining compatible with M4 tapped holes and M4 nuts.

Typical applications include electrical enclosure assembly, instrument and control panel mounting, light machinery and fabrication, furniture fixings and general maintenance and repair across industries such as manufacturing, building services, HVAC, automotive interior assemblies and electronics. The use of a 10 mm hex drive gives straightforward installation with standard hand tools and power sockets, reducing cam‑out and speeding repetitive assembly tasks.

Duchy Fasteners stocks a wide range of M4 hex bolts and matching hex bits in multiple lengths, materials and pack quantities. Contact us for current availability and trade pack options to suit your project.