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These nuts are designed for applications with limited clearance or for use in double nut locking arrangements. Although largely superseded by ISO standards, DIN 439 remains widely used and readily available in stainless steel.

Applicable Standard

  • DIN 439 1 – Unchamfered thin hexagon nuts (equivalent to ISO 4036)
  • DIN 439 2 – Chamfered thin hexagon nuts (interchangeable with ISO 4035)
  • Fine pitch variants covered by ISO 8675

Material

  • A2 Stainless Steel (304): A2/70
  • A4 Stainless Steel (316): A4/70, A4/80

Sizes

M5–M48.

Specific Features

  • Reduced height metric nuts
  • General fastening
  • Suitable for tightening using conventional spanners or sockets

Performance

  • Suitable for external, corrosive, and marine environments
  • Compatible with stainless steel threaded rod systems

Typical Applications

  • Locking arrangements using double nut configurations
  • Adjustment and setting applications on threaded bar
  • Limited clearance assemblies
  • Structural tie bar and façade support systems (as locking nuts)
  • General mechanical and construction fixings

Installation Notes

  • Tightened using standard spanners or sockets
  • Full thread engagement recommended
  • Anti galling measures advised for stainless steel assemblies

Dimensions & Design

  • Reduced height hexagon profile, typically around half the thickness of standard full nuts
  • Designed for use where thread engagement or installation space is restricted
Product Size D (mm)S (mm)E (mm)M (mm)Weight per 1000 pcs (Kg)
M5 5 8 8.87 2.7 0.83
M6 6 10 11.05 3.2 1.6
M8 8 13 14.38 4 3.2
M10 10 17 18.9 5 7.2
M12 12 19 21.1 6 10.4
M16 16 24 26.75 8 20.5
M20 20 30 33.53 10 0.2
M24 24 36 39.98 12 69.5
M30 30 46 51.28 15 139
M36 36 55 61.31 18 244
M42 42 65 72.61 21 403
M48 48 75 83.91 24 617

View our Stainless Steel Thin Hexagon Nuts (Jam Nuts) datasheet

(PDF, 770 KB)