(Note: Measurements are outside max. dimensions unless stated otherwise).19th Century : Traditional mild steel bed bolt with square nut and hand cut thread.Collar diam. 28mm. (1 1/16")Total length 153mm. (6 1/8") THREAD 64mm. (2 1/2") + SHAFT 72mm. (2 13/16") + COLLAR 3mm. (1/8") + SQUARE HEAD 14mm. (9/16")Shaft diam. 12mm. (7/16")Square head 10mm. (3/8") x 10mm. (3/8")Square nut 22mm. (7/8") x 22mm. (7/8")