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- Thread Size
UNF A2 Stainless Part Thread Socket Cap Head Allen Bolts 8,10,1/4,5/16,3/81/2
10"UNF - 32tpi, allen key size 5/32". Threads are Unified National Fine (UNF). 1/4"UNF - 28tpi, allen key size 3/16". 5/16"UNF - 24tpi, allen key size 1/4".