#8 外齒鎖緊墊圈 | 鋼製黑色氧化處理 (5000 / 包)

The black oxide finish on these held up perfectly through a full day of assembly work, no flaking or rust spots after getting handled with oily gloves. Five thousand pieces in the bag means I won’t need to reorder for a long time, and they seat flat without any wobble on the bolts I’ve torqued down.

Been using these for a few weeks on a bench-mounted grinder, and the black oxide finish hasn't chipped or worn off at all. The external teeth really grip tight—nothing has loosened despite constant vibration from the motor.

Exactly what I needed for securing some brackets on a vibrating machine. The black oxide finish looks clean and they seat nicely against the steel surface. A solid 5000-count box means I won't be running out anytime soon.