DMM Ultra D Locksafe Carabiner – 30 kN, D-Shape

DMM Ultra D Locksafe – High-Strength D-Shape Aluminum Carabiner

The DMM Ultra D Locksafe (SKU: K337) is engineered for arborists and climbers who demand maximum strength from a D-shaped connector. The pronounced D-shape forces all loading along the major axis — where the carabiner is strongest — making it an ideal choice for lanyard terminations and high-load connection points.

Key Features

• Pronounced D-shape maximizes major axis loading for superior strength
• Locksafe gate — autolocking for secure, hands-free closure
• Hot-forged aluminum construction for strength and light weight
• 84g weight — lightweight for all-day carry
• 22mm gate opening for easy clipping
• Perfect for use at the end of lanyards and as a primary connector

Specifications

• SKU: K337
• Dimensions: 66 x 113mm
• Weight: 84g
• MBS Major Axis: 30 kN
• MBS Minor Axis: 12 kN
• MBS Gate Open: 9 kN
• Gate Opening: 22mm
• Gate Type: Locksafe (autolocking)
• Certifications: EN 362:2004 B, EN 12275:2013 B
• Vendor: DMM

D-Shaped Carabiner Comparison

Feature	Husqvarna D $19.99	RockD Autolock $28.50	RockD Orca $30.50	DMM Ultra D Locksafe $40.95	DMM Ultra D ANSI $44.65
MBS Major Axis	30 kN	29 kN	29 kN	30 kN	30 kN
MBS Minor Axis	7 kN	11 kN	11 kN	12 kN	16 kN
MBS Gate Open	7 kN	9 kN	9 kN	9 kN	9 kN
Gate Type	Double-lock twist	3-stage autolock	Orca-lock	Locksafe	Locksafe
Key-Lock Nose	✓	✓	✓	✓	✓
Gate Opening	High capacity	0.95" (24mm)	0.95" (24mm)	22mm	16mm
Weight	0.35 lb	2.85 oz (80g)	2.85 oz (80g)	84g	100g
Certifications	EN 362, ANSI Z133	CE	CE	EN 362, EN 12275	EN 362, EN 12275, ANSI/ASSE Z359.12
Price	$19.99	$28.50	$30.50	$40.95	$44.65

Full DMM Ultra D Range

Model	Code	Weight	MBS Major	MBS Minor	MBS Open	Gate Opening	Certifications
Ultra D Titanium Locksafe	A337	84g	30 kN	12 kN	9 kN	22mm	EN 362:2004 B, EN 12275:2013 B
Ultra D Matt Grey Locksafe	A337MG	84g	30 kN	12 kN	9 kN	-	EN 362:2004 B, EN 12275:2013 B
Ultra D Titanium Kwiklock	A333	84g	30 kN	12 kN	9 kN	22mm	EN 362:2004 B, EN 12275:2013 B
Ultra D Titanium Screwgate	A332	80g	30 kN	12 kN	9 kN	23mm	EN 362:2004 B, EN 12275:2013 B
Ultra D Matt Grey Screwgate	A332MG	80g	30 kN	12 kN	9 kN	22mm	EN 362:2004 B, EN 12275:2013 B
Ultra D Locksafe ANSI	A337ANSI	100g	30 kN	16 kN	9 kN	16mm	EN 362, EN 12275, ANSI/ASSE Z359.12, CAN/CSA Z259.12

Frequently Asked Questions

What is the difference between the Locksafe and ANSI versions?
The ANSI version (A337ANSI) meets additional North American standards (ANSI/ASSE Z359.12-2019 and CAN/CSA Z259.12-16) and has a higher minor axis MBS of 16 kN vs. 12 kN, but has a smaller gate opening of 16mm vs. 22mm.

What does Locksafe mean?
Locksafe is DMM's autolocking gate system — the gate closes and locks automatically without any manual action required from the user.

Is this suitable for arborist work?
Yes — the EN 362:2004 B certification covers connectors for personal fall protection, making it appropriate for professional climbing applications. Always verify compliance with your local regulations and employer requirements.

What is the gate opening size?
The standard Locksafe version has a 22mm gate opening. If you need a larger opening for bulky connectors, consider the Husqvarna D or Rock Exotica RockD which offer wider openings.

Related Products

• DMM Ultra D Locksafe ANSI
• Husqvarna D Carabiner
• Rock Exotica RockD Autolock
• Rock Exotica RockD Orca Auto Lock
• Browse All Aluminum Carabiners
• Browse All Autolocking Carabiners