Heat-treated Large Steel Locking D was created to address the need for a very strong steel carabiner without adding unnecessary weight and size. Built to the same specifications as the standard SMC Large Locking Steel Carabiner and certified by Underwriters Laboratories to meet NFPA -G- General Use standards but with an additional step of heat-treatment in order to provide an incredible 30% greater strength.

This is one of SMC-s best selling steel carabiners. The Large Steel Locking D was developed especially for the needs of the fire and rescue communities with a large gate opening that easily fits over litter rails. The NFPA21001 & NFPA21007 are the models that are stamped with the requisite UL Certification.

The SMC Kinetic Series has been specifically designed for users who require only the best equipment possible, available in NFPA Certified for Work and Rescue environments.

The SMC NFPA Locking D Series carabiner is a true representation of timeless quality and attention to detail. As one of the most versatile mid-sized locking carabiners on the market you will find that form and function are unsurpassed. The enduring design of the SMC Locking D has become a standard in rock climbing, mountaineering and rescue applications as well as in ever increasing industrial applications due to its high strength, light weight, wide gate opening and overall functional versatility.

The SMC Kinetic Series has been specifically designed for users who require only the best equipment possible, available in NFPA Certified for Work and Rescue environments and Non-NFPA for Mountaineering and Sport environments.