M4 Nuts, Bolts & Washers

Handle precision fastening tasks with confidence using our range of M4 nuts, bolts, and washers. With a nominal 4mm diameter, these metric fixings are essential for securing lightweight panels, small machinery, and electronic components where a compact yet strong connection is required. Whether you are working on automotive trim repairs or assembling intricate workshop equipment, these fasteners deliver the holding power needed for professional results.

Our selection specifically features nylon lock nuts, designed with a nylon insert that grips the bolt thread to prevent loosening caused by vibration and torque. Manufactured by trusted trade brands like FandF and finished with durable zinc plating, these M4 fixings offer reliable protection against rust and corrosion, ensuring a long-lasting hold for indoor and sheltered outdoor projects.

 

Frequently Asked Questions | FAQ

What is the thread size of an M4 nut?

An M4 nut has a nominal thread diameter of 4mm. It utilizes a standard metric coarse thread pitch, making it compatible with all standard M4 bolts, screws, and threaded bars.

What spanner size do I need for an M4 nut?

Standard M4 hexagon nuts typically require a 7mm spanner or socket. However, always check the specific head dimensions of your fixings, as specialized types like nylon lock nuts can sometimes vary.

Why use a nylon lock nut over a standard nut?

A nylon lock nut contains a nylon insert that deforms elastically over the mating thread. This creates friction that prevents the nut from working loose under vibration, making it superior to standard nuts for moving machinery or automotive applications.