Are they uiaa certified?

I believe so. They have CE and KN rating so they are at least CE certified. I dont use them as lifeline due to still not 100% trusting in them, I use them for rigging limbs for ziplines or soft drops. Amazing feeling carabiners tho. Would recommend for rigging. For Lifeline go with Petzl or another known name brand.

Has there been stress-testing done, trying to collapse the lock from the outside in?

Probably a question for the manufacturer. I can tell you that I use these to connect my deer stand climbing harness to my safety line. Last year in a pouring rain when I slipped, I didn't hit the ground! PTL.

Is this strong enough to replace a collars d-ring to sustain heavy pulling by a 90lbs male german shepherd?

I have a 100 lb Czech working line GSD that is incredible strong, and I bought this for a tie out in my front yard. Since he's broken a collar and a harness running at people walking their dogs past our yard, I decided to beef everything up. I can confirm this will not break with a GSD running full speed and trying to get to another dog. If you're using it as part of a leash, you'll lose an arm before this thing breaks.

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🔒 Lock in safety, unlock your adventure!

UNMATCHED STRENGTH - Supports a massive 5620 lbs load for ultimate safety and confidence.
GENEROUS SIZE SMOOTH FINISH - Large 4.5" x 2.9" D-shape with no sharp edges—perfect for climbing, camping, or everyday carry.
PREMIUM AIRCRAFT GRADE BUILD - Crafted from 7075 aluminum alloy for a featherlight yet rock-solid feel.
EFFORTLESS ONE HAND OPERATION - Twist-lock design lets you secure or release with a simple flick—no fumbling required.
VERSATILE ADVENTURE ESSENTIAL - From rappelling to keychains, this carabiner adapts seamlessly to your active lifestyle.

The FVW Auto Locking Rock Climbing Carabiner is a professional-grade, large D-shaped clip made from lightweight 7075 aircraft aluminum. It features a secure one-hand twist-lock mechanism and supports up to 5620 lbs, making it ideal for climbing, rescue, camping, and everyday carry.

€ 34.14

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TrustScore 4.5 | 7,300+ reviews

Zainab N.

Fantastic and great service. Shipping was faster than expected.

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Color	Silver*2
Material	Aluminum
Brand	FVW
Item Weight	60 Grams
Recommended Uses For Product	Climbing
Shape	D-Shape
Lock Type	Screw Lock
Product Dimensions	4.5"L x 2.9"W
UPC	760385102415
Maximum Weight Recommendation	5620 Pounds
Item Package Dimensions L x W x H	7.56 x 5.43 x 0.87 inches
Package Weight	0.19 Kilograms
Item Dimensions LxWxH	4.5 x 2.9 x 0.04 inches
Brand Name	FVW
Part Number	FVW

FVW Auto Locking Rock Climbing Carabiner Clips,Professional 25KN (5620 lbs) Heavy Duty Caribeaners for Rappelling Swing Rescue & Gym etc, Large D-Shaped Carabiners

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