Page 59 of Rigging by Vanguard Steel
d-rings vgd d-rings with bolt-on hinges · · · · made from drop forged carbon steel strong bolt-on hinges yellow chromated working load limit 4,000 lbs design factor 3:1 size 2.25 x 2.5 x 0.5 wll lbs 4,000 dimensions inches a 2.250 b 2.500 c 0.500 d 0.625 e 3.125 f 2.000 g 0.375 h 2.000 r1 1.500 r2 0.250 vanguard code 3705 0010 note working load limits are for straight in-line pulls only warning use bolts of adequate size and strength only secure bolts with washers and lock washers torque-tighten bolts vanguard steel ltd.
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