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