What requires a 90 degree clockwise twist to couple?

What requires a 90 degree clockwise twist to couple?

• A. Breech coupling connector
• B. Quick-disconnect plug
• C. Threaded coupling nut
• D. Snap-fit connector

Answer: (A)

A breech coupling uses a bayonet-style locking action, where two halves mate and then a 90-degree clockwise twist locks the connection. This quarter-turn engagement aligns the locking lugs with the receptacles and compresses the seal, giving a secure, leak-tight, and quickly mated connection. It’s designed for speed and positive retention, so a simple turn after push-in guarantees the halves stay locked during operation. The other types require different motions: a quick-disconnect plug uses a release collar or sleeve to separate, not a twist to lock; a threaded coupling nut requires multiple turns to engage the threads; and a snap-fit connector engages by snapping into place without any rotation.

A breech coupling uses a bayonet-style locking action, where two halves mate and then a 90-degree clockwise twist locks the connection. This quarter-turn engagement aligns the locking lugs with the receptacles and compresses the seal, giving a secure, leak-tight, and quickly mated connection. It’s designed for speed and positive retention, so a simple turn after push-in guarantees the halves stay locked during operation.

The other types require different motions: a quick-disconnect plug uses a release collar or sleeve to separate, not a twist to lock; a threaded coupling nut requires multiple turns to engage the threads; and a snap-fit connector engages by snapping into place without any rotation.