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Socket Head Cap Screws

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Technical Information

Allen Wrench Size Chart
  Allen Wrench Stock No. Allen Wrench Hex Key Size For Socket Head Cap For Socket Head Set For Button Head Cap
English #58-639 0.028" N/A #0 N/A
#58-638 0.035" N/A #2 #0
#56-271 0.050" #0 #4 #2
#58-637 1/16" #1 #6 #3 & #4
#56-270 1/64" #2 & #3 #8 #5 & #6
#55-188 3/32" #4 & #5 #10 #8
#55-189 7/64" #6 N/A N/A
#03-662 1/8" N/A ¼" #10
#55-190 9/64" #8 N/A N/A
#55-191 5/32" #10 & #12 5/16" #12 & ¼"
#55-192 3/16" ¼" 3/8" 5/16"
Metric #58-636 0.9mm N/A M2 N/A
#55-452 1.5mm M1.6 & M2 M3 M2.5
#57-445 2mm M2.5 & M2.6 M4 M3
#55-451 2.5mm M3 M5 M4
#55-199 3mm M4 M6 M5
#55-200 5mm M6 M10 M8