SMC ‘Large Heat-Treated Steel Locking D’

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Product Description
Color Bright
Description One of the strongest 100% USA-Made steel carabiners on the market!

Heat-treated Large Steel Locking D was created to address the need for a very strong steel carabiner without adding unnecessary weight and size. Given the additional step of heat-treatment in order to provide an incredible 30% greater strength. With same specs as the SMC Large Locking D Carabiner platform, and certified to meet NFPA “G” General Use standards, this is the hard working, nearly indestrcutible carabiner needed in every kit.

The sleeve locks on the gate rather than the body of the carabiner, eliminating problems of the knob binding on the frame after the carabiner has been loaded. Uses “hybrid” steel/stainless steel construction; incorporating stainless steel gate and locking sleeve for greater strength, smoother action and long-lasting reliability. All the components in this carabiner are meticulously hand-finished after machining resulting in the smooth, free gate action that is the hallmark of all SMC carabiners. Additionally, each carabiner is 100% hand inspected for gate action and other functional characteristics before leaving our factory.

Available in Bright Zinc plated.


  • Heat treated, high quality Alloy Steel for significantly increased strength to weight ratio.
  • UL certified to meet NFPA1983 “G” General Use.
  • 100% Made in the USA
  • Unique “hybrid” construction utilizes stainless steel for gates and other internal parts
  • Pins are flush-mounted with gate for a virtually snag-free operation.
  • Thread design and medium knurl provide a positive action for secure use with gloves yet is easy on bare hands.
  • Offset D shape results in larger gate opening.
  • Model #: NFPA21002
  • Material: Heat Treated Steel Alloy
  • Finish: Zinc Plated
  • Dimensions: 5.04” x 2.97”
  • Gate opening: 1.20”
  • Weight: 10.6 oz (300g)
  • 3 Sigma test:
    • Major axis– 75kN (14,612 lbf)
    • Minor axis– 16kN (3,597 lbf)
    • Gate open– 18kN (4,046 lbf)
  • NFPA1983 Certified
  • Made In USA
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