Jam nuts are half-height hex nuts used to lock a full nut or to secure a component where there is no room for a standard nut. We stock DIN 439 / ISO 4035 in Umm Al Quwain from M4 to M52 in steel and stainless A2 / A4, zinc plated or plain.
A jam nut (thin nut, lock nut, half nut) is about half the height of a standard hex nut. Tightened against a full nut it jams the threads and stops the assembly working loose — the traditional double-nut lock. It is also used where a thin nut is needed to hold a bearing, adjuster, sensor or spindle in position. Because the thread engagement is short, jam nuts are not used alone to carry full bolt load.
Applications
- Double-nut locking on threaded rod and adjusters
- Bearing, spindle and shaft retention
- Sensors, fittings and instrument mounting
- Turnbuckles, tie rods and stay bars
- Electrical panels and busbar supports
- Pipe hangers and clevis adjustments
Standards, grades & finishes
Nuts to DIN 439 / ISO 4035 (chamfered) and ISO 4036 (unchamfered), property class 04 and 05 to ISO 898-2, stainless A2 / A4 to ISO 3506-2, threads ISO 965 6H coarse or fine (DIN 439-2). Finishes zinc plated to ISO 4042, plain, hot-dip galvanized.
This item is imported from approved mills and held in stock in our Umm Al Quwain warehouse alongside the anchor bolts, studs and plate washers we manufacture ourselves, so complete bolt sets ship from one source. Tensile, hardness and chemical testing is carried out by independent UAE-accredited laboratories, and EN 10204 3.1 certificates are issued with every batch. We supply across the GCC, MENA and Africa.