No. 12 Wrenches | McMaster-Carr

A spline-shaped box end turns spline, hex, and 12-point fasteners with minimal effort. This shape also gets a better grip on rounded fasteners that can be difficult to turn with a traditional wrench. These wrenches have a ratchet mechanism that allows you to turn fasteners in tight spaces without removing and repositioning. Flip over to ratchet in the opposite direction. Wrenches are polished for a mirror-like finish.

For technical drawings and 3-D models, click on a part number.

Box End					Open End
External Hex/12-Point Drive Size	External Spline Drive Size	Head Offset Angle	Head Thick.	Turn Required to Ratchet	External Hex/Square/12-Point Drive Size	Opening Angle	Head Thick.	Overall Lg.	Material	Appearance		Each
Inch
3/8"	No. 12	15°	19/64"	5°	3/8"	15°	13/64"	5 59/64"	Chrome-Plated Steel	Polished	0000000	000000
Metric
12 mm	No. 12	15°	21/64"	5°	12 mm	15°	15/64"	7 27/64"	Chrome-Plated Steel	Polished	0000000	00000

Spline Ratcheting Combination Wrench Sets

A spline-shaped box end turns spline, hex, and 12-point fasteners. This shape also gets a better grip on rounded fasteners that can be difficult to turn with a traditional wrench. These wrenches have a ratchet mechanism that allows you to turn fasteners in tight spaces without removing and repositioning the tool. Wrenches are polished for a mirror-like finish.

For technical drawings and 3-D models, click on a part number.

Box End				Open End
External Hex/12-Point Size	External Spline Size	Head Offset Angle	Turn Required to Ratchet	External 12-Point Size	Opening Angle	Overall Lg.	Material	Container Type		Each
Inch Wrench Sets
11-Piece Sets
1/4" 9/32" 5/16" 11/32" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4"	No. 8 No. 9 No. 10 No. 11 No. 12 No. 14 No. 16 No. 18 No. 20 No. 22 No. 24	15°	5°	1/4" 9/32" 5/16" 11/32" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4"	15°	5 1/8"-11"	Chrome-Plated Steel	Plastic Roll-Up Pouch	0000000	0000000
Metric Wrench Sets
14-Piece Sets
6 mm 7 mm 8 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 18 mm 19 mm	No. 6 No. 7 No. 8 No. 9 No. 10 No. 11 No. 12 No. 13 No. 14 No. 15 No. 16 No. 17 No. 18 No. 19	15°	5°	6 mm 7 mm 8 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm 16 mm 17 mm 18 mm 19 mm	15°	4 15/16"-11 1/16"	Chrome-Plated Steel	Plastic Roll-Up Pouch	0000000	000000

Bit Assortments

These assortments contain general-purpose bits.

Hex shank bits (also known as insert bits) are used in hand drivers or with a bit adapter in power tools.


Hex	Tamper-Resistant Hex	Phillips	Slotted
Torx	Drilled Spanner	Pozidriv®	Tamper-Resistant Torx

1/4" Hex Shank Size—Steel
No. of Pieces	Components Included	Bits Included	Adapters Included		Each
100	96 Bits 4 Adapters	Drilled Spanner: No. 4, No. 6, No. 8, No. 10 No. 12, 1/4" (1" O'all Lg.)—1 ea. Hex (Inch): 0.050", 1/16", 5/64", 3/32", 7/64" 1/8", 9/64", 5/32", 3/16", 7/32", 1/4" 5/16", 3/8" (1" O'all Lg.)—1 ea. Hex (Metric): 1.5 mm, 2 mm, 2.5 mm, 3 mm 4 mm, 5 mm, 6 mm, 7 mm, 8 mm (1" O'all Lg.)—1 ea. Phillips: No. 0 (1" O'all Lg.)—1 ea. Phillips: No. 1, No. 3 (1" O'all Lg.)—2 ea. Phillips: No. 2 (1" O'all Lg.)—4 ea. Pozidriv®: No. 1, No. 2, No. 3 (1" O'all Lg.)—1 ea. Screw-In Hook Driver Bit—1 ea. Slotted: 3/32", 1/8", 5/32", 3/16", 7/32", 1/4" 9/32", 5/16", 3/8" (1" O'all Lg.)—1 ea. Square: No. 0, No. 1, No. 2, No. 3, No. 4 (1" O'all Lg.)—1 ea. Tamper-Resistant Hex (Inch): 3/32" 7/64", 1/8", 9/64", 5/32", 3/16", 7/32" 1/4", 5/16" (1" O'all Lg.)—1 ea. Tamper-Resistant Hex (Metric): 2.5 mm, 3 mm 4 mm, 5 mm, 6 mm, 8 mm (1" O'all Lg.)—1 ea. Tamper-Resistant Torx: T6, T7, T8, T9, T10, T15 T20, T25, T27, T30, T40 (1" O'all Lg.)—1 ea. Torx: T5, T6, T7, T8, T9, T10, T15, T20, T25, T27 T30, T40, T45, T50, T55 (1" O'all Lg.)—1 ea.	1/4" Male Square Drive × 1/4" Hex Shank Adapter (1" O'all Lg.) 1/4" Male Square Drive × 1/4" Hex Shank Adapter (2" O'all Lg.) 2 1/2" Lg. Bit Adapter for Power Tools Bit Adapter for Square Drive Tools	000000	000000