center pin

基本解释

GAULDED ROLL: Defect on the cage caused by punches, which do not move freely on the center pin; cause a deformed bottom or side of cage.
卷边：由于冲头不能在中心销上自由地运动，造成保持架底部或者边侧的变形缺陷。
The center pin (30) comprises a slit (31) in the longitudinal direction, and first cutout parts (32) crossing perpendicularly to the slit (31).
中心引脚（30）具有在纵向上提供的割线（31）以及垂直横穿割线（31）的第一切口（32）。
ip.com
When the center pin is collapsed by the external force, corner parts (33) at intersections between the slit (31) and the first cutout parts (32) are projected to securely produce a short-circuit.
当因外力变平时，割线（31）与第一切口（32）的交叉点处的边角（33）突出，并且安全地产生短路。
ip.com

One call center scam involves calling the CSR to change the PIN on an ATM card.
FORBES: Cybercriminals Phone It In
Trailers are typically attached to tractors by a "fifth wheel, " in which a coupling pin on the trailer fits into the center of a large horseshoe-shaped piece of metal.
NPR: Runaway Trailer Crashes Rare; NY Accident Killed 7