Table of Contents
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REF: Hex, Socket (Allen) and Torx Bolt and Screw Wrench Sizes
Hex Bolt and Socket (Allen) Screw Wrench Sizes
US Hex Bolt and Socket (Allen) Screw Wrench Size | Metric Hex Bolt and Socket (Allen) Screw Wrench Size | ||||
Nominal Thread Diameter | Hex Bolt Wrench Size | Hex Socket Wrench Size | Nominal Thread Diameter | Hex Bolt Wrench Size | Hex Socket Wrench Size |
#6 | 1/4“ | - | M4 | 7mm | 3mm |
#8 | 1/4” | - | M5 | 8mm | 4mm |
#10 | 5/16“ | - | M6 | 10mm | 5mm |
#12 | 5/16” | - | M8 | 13mm | 6mm |
1/4“ | 7/16” | 3/16“ | M10 | 17mm | 8mm |
5/16” | 1/2“ | 1/4” | M12 | 19mm | 10mm |
3/8“ | 9/16” | 5/16“ | M14 | 22mm | 12mm |
7/16” | 5/8“ | 3/8” | M16 | 24mm | 14mm |
1/2“ | 3/4” | 3/8“ | M18 | 27mm | 14mm |
9/16” | 1-3/16“ | 7/16” | M20 | 30mm | 17mm |
5/8“ | 1-5/16” | 1/2“ | M22 | 32mm | 17mm |
3/4” | 1-1/8“ | 5/8” | M24 | 36mm | 19mm |
7/8“ | 1-5/16” | 3/4“ | M30 | 46mm | 22mm |
1” | 1-1/2“ | 3/4” | |||
1-1/8“ | 1-11/16” | 7/8“ | |||
1-1/4” | 1-7/8“ | 7/8” | |||
1-3/8“ | 2-1/16” | 1“ | |||
1- 1/2” | 2-1/4“ | 1” | |||
1-3/4“ | 2-5/8” | 1-1/4“ | |||
2” | 3“ | 1-1/2 |
Torx Screw Wrench Sizes
Screw Size | Torx Socket Set Screw | Torx Socket Cap Screw | Torx Pan Head Screw | Torx Flat Head Screw | Torx Fillister Head Screw | Torx Truss Head Screw | Torx Oval Head Screw | Torx Hex Head Screw | Torx Internal Washer Head Screw |
#2 | T3 | - | T7 | T6 | - | - | - | - | T7 |
#3 | T5 | - | T8 | T7 | - | - | - | - | T8 |
#4 | T6 | T10 | T9 | T8 | T9 | - | - | T9 | T9 |
#5 | T7 | T10 | T10 | T9 | T10 | - | T10 | T10 | T10 |
#6 | T7 | T15 | T15 | T10 | T15 | T10 | T15 | T15 | T15 |
#8 | T8 | T25 | T20 | T15 | T20 | T15 | T20 | T20 | T20 |
#10 | T10 | T27 | T25 | T20 | T25 | T20 | T25 | T25 | T25 |
#12 | T10 | T27 | T27 | T25 | T27 | T25 | T27 | T27 | T27 |
1/4” | T20 | T30 | T30 | T27 | T30 | T27 | T30 | T30 | T30 |
5/16“ | T27 | T45 | - | T40 | T40 | T30 | T40 | T40 | - |
3/8” | T30 | T50 | T45 | T40 | T45 | T40 | T45 | T45 | - |
7/16“ | T40 | T55 | T50 | T50 | T50 | T45 | T50 | - | - |
1/2” | T45 | T55 | T55 | T55 | T55 | T50 | T50 | - | - |
SAE to Metric Wrench Conversions
SAE Wrench Size | 5/16“ | 3/8” | 7/16“ | 1/2” | 9/16“ | 5/8” | 3/4“ | 13/16” | 7/8“ | 15/16” |
SAE Bolt Size | 1/8“ | 3/16” | 1/4“ | 5/16” | 3/8“ | 7/16” | 1/2“ | 9/16” | 9/16“ | 5/8” |
Metric Wrench Size | 8mm | 10mm | 11mm | 13mm | 14mm | 16mm | 19mm | 21mm | 22mm | 24mm |