Industrial Fastener · Nuts Series
Hex Thin Nut / Jam Nut
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.
Product Overview
Hex Thin Nut / Jam Nut sourcing essentials
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.
DIN 439, ISO 4035, ISO 8675
Carbon steel, Stainless 304/316
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...
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| 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 |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
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.
Ready to quote Hex Thin Nut / Jam Nut?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.