SMC NFPA Locking D Aluminum NFPA Versions


SKU: NFPA18501 P Category:

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.

Like our Mountain D and Light D Series carabiners the asymmetrical frame is slightly flattened for an increased strength-to-weight ratio, internal components are stainless steel, and the locking sleeve engages on the gate not on the carabiner frame to help prevent jamming or vibrating loose.

SMC assures that all carabiners are 100% visually and physically inspected. Our attention to detail and precision craftsmanship guarantees you receive the highest level of quality, value and flawless performance insuring your carabiners are amongst the finest in the world. The Locking D is offered in five colors, Bright, Black, Purple, Orange and Red. Purple, Red and Orange versions feature a color anodized frame with bright gate and sleeve.

Also available as non-NFPA Certified for environments that require strong high quality connectors such as sport climbing and mountaineering.


UL certified to NFPA 1983 “T” Technical Use

Simple design uses minimum number of parts / components providing for excellent and reliable functionality.

Modified D shape provides for larger gate opening.

Sleeve locks on gate not the frame, resulting in greater reliability and less jamming.

The frame is slightly flattened for increased strength-to-weight.

Pins are flush-mounted with gate for virtually snag-free operation.

Manufactured using high quality aluminum for light weight, durability and strength.

Available in Bright , Black, Purple, Orange and Red.

Made in the USA.


Certified by Underwriter’s Laboratories to exceed the NFPA 1983 “T” – Technical Use requirement of 27kN.

All SMC NFPA products are stamped with the required certification information and the user information is enclosed with each item as required by NFPA.


Black, Bright, Red



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