HEX COUPLING NUT / EXTENSION NUT (DIN 6334)

HEX COUPLING NUT / EXTENSION NUT (DIN 6334)
Hex coupling nut, also known as extension nut or long nut, is a threaded fastener for joining two male threads, most commonly a threaded rod.

But also pipes. The outside of the fastener is usually a hex so a wrench can hold it. Variations include reducing coupling nuts, for joining two different size threads; sight hole coupling nuts, which have a sight hole for observing the amount of engagement; and coupling nuts with left-handed threads.

These are used to make up long rod assemblies from shorter lengths of rods.
The rods are threaded into the coupling nut for a certain distance. Coupling nut dimensions are described by the Industrial Fasteners Institute in standard IFI-128.
It is given a plain finish. It is either cold drawn or hot rolled depending on the bar stock used. Coupling nuts threaded with two different thread sizes and profiles are called reducing coupling nuts. Coupling nuts can be used to tighten a rod assembly inward or to press a rod assembly outward.

INTERNATIONAL STANDARDS

  • DIN 6334
  • IFI-128

APPLICATIONS

COMMONLY USED IN THE AUTOMOTIVE, CONSTRUCTION, BICYCLE AND CABINET FURNITURE INDUSTRIES.

MATERIAL

Material Available:

  • LOW CARBON STEEL : C1006 - C1045
  • STAINLESS STEEL: SUS304, SUS316, SUS410
  • GRADE 8.8: C1018 - C1022, 10B21
  • MILD STEEL / MID CARBON STEEL: C1035 - C1045
  • ALLOY STEEL: SCM435 - SCM440 (Grade 10.9, Grade 12.9)
  •  │8│GRADE 1008K 1010 
  • 7 8 GRADE 1015(M<16) CH38F (M≥16)
  • 8 10 GRADE CH38F 1039 10B21 10B33
  • 9 12 GRADE 1039 10B21 10B33 10B38 
  • BRASS C2600, C2700, C2680
  • RED BRASS C1100
  • Phosphor Bronze C5191
  • Aluminum Alloy 1050, 5052, 6061
  • Material according to customer’s specifications

SIZE RANGE

  • HEAVY DUTY LONG NUT ; D= 1/2" - 3/4"

 HEX COUPLING NUT
DIAMETER         HEX SIDE          
#6~1-1/2        5/16~2"
M4~M30          8H~46H


ROUND COUPLING NUT
DIAMETER       HEX SIDE
5/32~1"         φ7~φ38
M4~M24

SURFACE TREATMENT

  • HEAT TREATMENT
  • ZINC PLATED – WHITE ZINC / YELLOW ZINC / BLACK ZINC
  • Zinc trivalent coatings Cr3+ (Meet RoHS standards)
  • Zinc hexavalent zinc plating Cr6+
  • Nickel plating
  • Black Oxide
  • Hot Dip Galvanised
  • GEOMET® 500
  • DACROMET®
  • Passivation
  • All electro-plating, electro-coating and surface treatment specifications can meet customer's requirements.