195 GB/T 929-1988 单耳托板自锁螺母 Self-locking nuts,singlelug, anchor
196 GB/T 930-1988 双耳托板自锁螺母 Self-locking nuts,twolug, anchor
197 GB/T 931-1988 角形托板自锁螺母 Self-locking nuts,angle, anchor
198 GB/T 932-1988 气密单耳托板自锁螺母 Self-locking nuts,singlelug, anchor, sealing,
199 GB/T 933-1988 气密双耳托板自锁螺母 Self-locking nuts,twolug, anchor, sealing
200 GB/T 937-1988 成组游动托板自锁螺母 Self-locking nuts, anchor, floating,Gang channel