Foundation Bolts

J-Type Foundation Bolts

DL/T 1236-2013 (reference only)

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DL/T 1236-2013 dimension drawing

Dimensions in mm
DL/T 1236-2013 dimension drawing

Specification parameters

Technical conditions and referenced standards

Recommended materials
  • Property class 4.6 a
  • Property class 5.6 a
  • Property class 8.8 b
  • Property class 8.8 b
Property class
  • Carbon steel or carbon steel with alloying additions
  • Carbon steel or carbon steel with alloying additions
  • Carbon steel with alloying additions (such as boron, manganese or chromium), quenched and tempered
  • Quenched and tempered alloy steel
Heat treatment
  • 20Mn, Q235
  • 35, 30Mn
  • For sizes ≤ M30, use 40Cr
  • For sizes > M30, use 42CrMo
  • For sizes ≤ M30, use 40Cr
  • For sizes > M30, use 42CrMo
Tolerances
  • Unspecified dimensional and geometrical tolerances for foundation bolts and nuts shall comply with GB/T 3103.1 for product grade C.
  • Unspecified dimensional and geometrical tolerances for foundation bolts and nuts shall comply with GB/T 3103.1 for product grade C.
  • Unspecified dimensional and geometrical tolerances for foundation bolts and nuts shall comply with GB/T 3103.1 for product grade C.
  • Unspecified dimensional and geometrical tolerances for foundation bolts and nuts shall comply with GB/T 3103.1 for product grade C.
Surface discontinuities
  • Surface discontinuities on foundation bolts shall comply with GB/T 5779.1 requirements
  • Surface discontinuities on foundation bolts shall comply with GB/T 5779.1 requirements
  • Surface discontinuities on foundation bolts shall comply with GB/T 5779.1 requirements
  • Surface discontinuities on foundation bolts shall comply with GB/T 5779.1 requirements
a If steel used to manufacture property class 4.6 or 5.6 foundation bolts has been work-hardened, it shall be heat-treated to remove the effects of work hardening.
b The material for these property classes shall have sufficient hardenability to achieve approximately 90% martensite at the core of the threaded cross-section after quenching and before tempering. Account shall also be taken of the effect of the hot-dip galvanizing temperature on mechanical properties.

Product overview

J-type foundation bolts have a hooked end and a threaded end. Their geometry and embedment requirements must follow the project design.

Provide the diameter, overall length, hook dimensions, thread length, material, finish, matching nuts and washers, and quantity.