Hex Thin Nut / Jam Nut (DIN 439 / ISO 4035)
A hex thin nut, often called a jam nut, is approximately half the height of a standard hex nut. Two thin nuts can be used together — one tightened against the other — to lock a connection, or a single thin nut can fit into low-clearance assemblies.
Specifications
| Standards | DIN 439, ISO 4035, ISO 8675 |
|---|---|
| Property Class | Class 04, 05 |
| Size Range | M3 – M52 |
| Height | Approximately 0.5 × diameter (vs 0.8 × for full hex nut) |
| Material | Carbon steel, Stainless 304/316 |
Frequently Asked Questions
How does the double-nut (jam) locking technique work?
Tighten the inner (thin) nut to the work, then tighten the outer (full or thin) nut down on top of it. Hold the inner nut and tighten the outer further — this pulls the threads in the two nuts in opposite directions on the bolt, creating a self-locking action. The technique is mechanically sound but requires correct sequence and torque to be reliable.
Need a quote on Hex Thin Nut / Jam Nut?
Send us your specifications, target quantity, and destination port. We will respond within 24 hours with sourceable options and indicative pricing.
Get a Quote