Learn how to use your handcuff key and engage handcuffs double locking mechanism

What are Handcuffs

Handcuff keys are simple devices with a very serious purpose. Used correctly and lawfully, they let you unlock standard handcuffs when you have the legal right to do so. This guide shows you how they work, how to use one, and how to stay safe and responsible. Always follow all local laws and never attempt to escape restraints placed by police or lawful authorities.

What a Handcuff Key Actually Does

Most handcuffs use a very simple lock. Inside the cuff is a small plate called the locking bar. When you turn the key, it lifts the locking bar off the teeth so the cuff can open. Every standard key is shaped the same because police handcuffs use the same internal pattern.

That is why even the tiny keys on Grim Workshop tools work. As long as the tip lifts the plate and the post turns the keyway, the cuff opens.

Operating Handcuffs

1. Locate the Keyhole

Handcuffs have a single keyhole on each cuff, usually facing:

Toward the subject’s hands (rear cuffing), or
Outward (front cuffing), depending on technique.

Check which side your keyhole is on by feeling for it with your fingers.

2. Insert the Key

Hold the handcuff firmly.
Insert the key fully into the keyhole with the bit oriented correctly (usually pointing upward).

Do not force the key — it should slide in smoothly.

3. Turn the Key to Release the Ratchet

Rotate the key 90 degrees or until you feel the lock mechanism disengage.

The cuff will loosen and open on its own once the ratchet is released.
Remove the cuff carefully to avoid pinching skin.

How to Engage the Double-Lock

Step 1: Locate the Double-Lock Hole or Slot

Each cuff has a small pinhole or slotted mechanism on the side.
This is the double-lock activation point.

On Smith & Wesson: small circular hole
On Peerless: rectangular slot or hole
On others: slightly different shapes, but always obvious near the keyhole

Step 2: Use the Back End of Your Handcuff Key

The raised nub or pin on the back of a standard handcuff key is designed specifically to set the double-lock.

Hold the key so the pin aligns with the hole or slot.

Step 3: Press the Pin Straight Into the Double-Lock Slot

Apply firm, direct pressure.
You will feel:

A small click
Or a solid “set” sensation

This tells you the cuff is now double-locked.

Do not dig, tilt, pry, or twist — press straight in.

How to Release the Double-Lock Later

When you’re ready to remove the cuffs:

Insert the key normally.
Turn the key in the opposite direction of unlocking to release the double-lock.
Turn the key the normal direction to open the cuff fully.

Common Mistakes to Avoid

Forcing the key: If it doesn’t turn, check orientation or double-lock status.
Unlocking too early during transport: Always ensure full control of the subject first.
Letting subjects reposition hands: Maintain control to prevent sudden movements.

FAQ

Q: Are all handcuff keys the same?

A: Standard police handcuffs all use the same key profile. Specialty, high security, or imported cuffs may use different patterns.

Q: Will a small Grim Workshop handcuff key work the same as a full size key?

A: Yes. As long as the key has the post and lever tip, it will operate a standard cuff.

Q: Can I legally carry a handcuff key?

A: In most places, yes, but there are exceptions. Some states or countries restrict possession when someone is detained or attempting escape. Always know your local laws.

Q: Why would someone carry a handcuff key for emergencies?

A: Outdoor workers, security staff, trainers, and people in high risk areas sometimes carry one to escape unlawful restraint. It is also common in survival kits.

Q: Will this open thumbcuffs or leg irons?

A: Many will, but not all. It depends on the lock type.

Q: What is a double lock and why does it matter?

A: A double lock prevents over tightening and stops a simple unlock. You must release it first or the cuff will not open.

Q: Can the key break inside the cuff?

A: Very rare. Stainless steel micro keys are strong enough for standard cuffs.

Q: What is the best way to practice?

A: Buy a pair of training handcuffs that you legally own and practice unlocking with your hands in front of you before trying more difficult positions.

Q: Can cold, water, or grit affect unlocking?

A: Yes. Dirt and cold can slow the turn or stiffen the mechanism. Keep your key clean and dry if possible.

Q: Will this damage the cuffs?

A: No. A proper handcuff key will not harm the mechanism.

How to Use Your Handcuff Key