7D1 4121-7D1N 7/8-9UNC 4121-7C1 4121-7C1N No. 5-40UNC 4121-51 4121-51N 7/16-20UNF 4121-7D2 4121-7D2N 7/8-14UNF 4121-7C2 4121-7C2N No. 6-32UNC 4121-61 4121-61N 7/16-28UNEF 4121-7D3 4121-7D3N 7/8-16UN 4121-7C516 4121-7C516N No. 8-32UNC 4121-81 4121-81N 1/2-13UNC 4121-1A1 4121-1A1N 1-8UNC 4121-2A1 4121-2A1N No. 10-32UNF 4121-102 4121-102N 1/2-20UNF 4121-1A2 4121-1A2N 1-12UNF 4121-2A2 4121-2A2N No. 12
