ASME/ANSI B18.21.2M-7-1999
米制A型锥形锁紧垫圈 表7
Metric type A toothed lock washers with countersunk-Table 7
ASME/ANSI B18.21.2M-8-1999
米制A型内外齿锁紧垫圈 表8
Metric type A external-internal tooth lock washers-Table 8
ASME/ANSI B18.21.2M-7-2005
米制A型锥形锁紧垫圈 表7
Metric type A toothed lock washers with countersunk-Table 7