Hammerlock

The hammerlock or chicken-wing is a standing shoulder lock and come-along hold, frequently used by policemen and nightclub bouncers. Hammerlocks are the to-go way to restrain and relocate an opponent; wherever you move, they will follow. Hammerlocked opponents can be used as human shields, and shoved into another opponent’s path as an atemi. Since the hammerlock is a completely nonviolent technique, it is ethical to use on people who are intoxicated, hysterical, and/or threatening self-harm.

To perform a hammerlock:

1. Grab the opponent’s same-side wrist.
2. Reach between the opponent’s body and arm, hooking their elbow or tricep with your opposite-side hand.
   • This "arm drag" is a common jiu-jitsu takedown setup.
   • Ideally, place your middle finger in the crook of their elbow.
3. Simultaneously pull your opposite-side hand down to towards your hip, and press your same-side hand in towards the opponent’s neck. This turns the opponent around, pinning their hand behind their back, with their elbow pointing out to the side (thus, a “chicken-wing”).
   • If the opponent’s elbow won't bend, apply nikkyō instead.
4. Push the opponent’s elbow towards their spine, sliding their wrist up towards their neck to increase shoulder joint pressure.
   • The goal is not to cause pain; the goal is to force the opponent on to their tiptoes, which makes them easy to off-balance. Mechanical-compliance holds are always more effective than pain-compliance holds.
5. Take your hand off the opponent’s elbow, and establish head control by:
   • Grabbing the back of the opponent’s jacket collar.
   • Reaching across the opponent’s neck to grab their opposite-side lapel.
   • Reaching across the opponent’s neck to hook the side of their face with the back of your hand, like an irimi hold.
     
     While this step is not required, it is strongly recommended since most hammerlock escape waza assume that this step was omitted. These extra grips keep the opponent from side-stepping or ducking to extend their arm. Also, your forearm will jam or check elbow strikes from the opponent's free arm.
     
     
6. Take a small step backwards, to slightly pull the opponent’s shoulders back past the plane of their hips. This breaks the opponent’s balance, making them easier to move and steer. This also precludes the opponent from performing foot hooks, sweeps, trips, or desperation moves.

[Photos of isolation techniques]
[Video of a hammer lock, fast and slow, from the front and side, and over the tori’s shoulder.] 

While hammerlocks superficially resemble a kimura, hammerlocks do not use a "figure-4" grip.

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