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A carabiner is a metal loop with a spring-loaded gate used to quickly and reversibly connect components, most notably in safety-critical systems. There are different carabiners available in the market. However many people face the dilemma of choosing one that suits their need. After going through this article one would be able to select from various variety of carabiners available.
Three main factors to consider while choosing a carabiner are:
Gate type
• Shape
• S-W-S (Size, Weight & Strength)

Once you are well versed with these three, you would be in a position to choose one as per your need.

Carabiner Gate Types
1. Bent Gate
These strong, durable gates have a concave shape that makes clipping a rope quick and easy; they are generally reserved for the rope-end of quickdraws. Some bent-gate carabiners are also known by the name of keylock carabiners. Bent-gate carabiners typically have an asymmetric shape.
• Make clipping the rope easy
• Durable
• Can feature a keylock for snag-free clipping
• Heavier than others

2. Locking Gate Carabiners
Locking carabiners have gates that can be locked in the closed position to provide extra protection against accidental gate openings. They feature either a manual (a.k.a. screw-lock) or auto-locking system.
Screw-lock gates require the user to manually screw the sleeve onto the gate to lock it.
Auto-lock carabiners automatically lock whenever the gate is closed.
Locking carabiners, though heavier than non-locking models, are the only choice for use with a belay/rappel device. You should also consider using them at belay stations and at critical protection placements. They offer a more secure attachment and enhance your peace of mind.
• Locking gate adds security
• Heavier than other styles

Carabiner Shapes
Mainly carabiners are available in four shapes which are as follows:
1. Asymmetric D Shape Carabiner
• Large gate opening
• Strong and light
• More expensive than other shapes
• Not as strong as the D shape

2. Pear Shape Carabiner
• Large gate opening
• Designed specifically for belaying and rappelling
• Heavier and more expensive than most other shapes
• Not as strong as D and asymmetric D shapes

3. D Shape Carabiner
• Strongest shape
• Larger gate opening than oval shape
• Smaller gate opening and heavier than asymmetric D shape
• More expensive than oval shape

4. Oval Shape Carabiner
• Uniform shape limits load shifting
• Hold more gear than D-shape carabiners
• Smaller gate opening and heavier than other shapes
• Not as strong as other shapes

Carabiner Size, Weight and Strength
Carabiner Size:
Carabiners come in a variety of sizes. Large carabiners are typically easier to handle and easier to clip (they have larger gate openings), and they can hold more gear inside. They are commonly used with belay and rappel devices. Smaller carabiners are lighter and take up less room on your rack, but they can be harder to clip.
Gate open clearance, provided in millimeters, is something you may want to pay attention to when looking at the size of a carabiner. This number refers to the width that the gate can open, plus the depth and shape of the bottom of the carabiner below the gate. Generally the smaller the carabiner, the less clearance it offers.
Too little gate-open clearance may lead to your finger getting stuck between the gate and the carabiner body while clipping; too deep a clearance can also make the carabiner difficult to clip. An ideal amount makes clipping the carabiner easy.

Carabiner Weight:
In general, the less weight you carry with you as you climb, the better. But lighter carabiners are not always best. Superlight carabiners are often smaller, which can make them harder to use when you’re clipping the rope or a bolt. Also, lightweight carabiners often use narrower rod stock, which can mean lower gate-open strengths and shorter lifespans. Narrow 'biners can also cause more rope wear, since the narrow ends can act like edges, biting into your weighted rope as it slides past.

Carabiner Strength:
Carabiners are rated for strength in three directions: lengthwise (major axis), sideways (minor axis) and while open (major axis open or "gate open"). These ratings are typically marked on the spine of the carabiner. All climbing carabiners pass some mandatory standards, which means they are plenty strong enough as long as you use them correctly. Gate-open strength and minor-axis strength are where you see the most variation.

Once you have the info about all these three parameters that define a carabiner, you would be in a comfortable position to make a good choice for your Adventure need.