CARRIAGE BOLT (DIN 603)

CARRIAGE BOLT (DIN 603)
A carriage bolt, coach bolt or round head square neck bolt is a form of bolt used to fasten metal to wood.

It is distinguished from other bolts by its shallow mushroom head and that the shank cross-section of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square section.

This makes the bolt self-locking when placed through a square hole in a metal strap, or a round hole in most wood. This allows the fastener to be installed with only a single tool, a spanner or wrench, working from one side. The head of a carriage bolt is usually a shallow dome. The squared section is of the same size as the diameter of the bolt shank, with a plain unthreaded shank.

Carriage bolts were developed for use through iron strengthening plates on either side of a wooden beam, the squared section fitting into a square hole in the ironwork. It is commonplace though to use them to bare timber, the squared section giving enough grip to prevent rotation.

INTERNATIONAL STANDARDS

  • DIN 603
  • ANSI/ASME B18.5

APPLICATION

Carriage bolts are extensively used for security fixings; such as locks and hinges, where the bolt must only be removable from one side.

The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side.

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

  • D = M6 - M12
  • L = 12mm - 100mm
  • d* = 5/16" X 1/2", 5/8", 3/4"

SURFACE TREATMENT

SURFACE TREATMENT TYPES:

  • PLAIN ; NON-PLATED
  • 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.