M14 × 2.0 Tap Drill Size & Thread Specs

Everything for a M14 × 2.0 coarse pitch thread on one page: tap drill (12 mm), clearance holes, wrench and hex key sizes, and the nearest inch thread.

SP-TD-01 · M14 × 2.0

M14 × 2.0 specs

SizePlate

M14 × 2.0 · tap with

12 mm drill

.4724″

12 mm · 77% thread

Inch drill: 15/32 · .4688
Clearance: 15 / 15.5 mm
Wrench: 21 mm
Cap screw key: 12 mm

Thread

Nominal size: M14 · .5512″
Pitch: 2 mm · 12.7 TPI
Series: coarse
fine pitch: M14 × 1.5

Drilling

Tap drill: 12 mm · .4724
Inch substitute: 15/32 · .4688
Close fit: 15 mm
Normal fit: 15.5 mm
Free fit: 16.5 mm

Tools

Hex head (ISO 4017): 21 mm
Hex head (DIN 933): 22 mm
Socket head cap key: 12 mm
Button head key: —
Flat head key: —

Nearest inch

Thread: 9/16-12
Major diameter: .5625″
Threads per inch: 12
Tap drill: 31/64
Interchangeable: No

Not interchangeable means the threads look close but won't run together: forcing one into the other strips both.

Drill size by thread percentage

Larger drill, less thread, easier tapping. 75% is the usual target.

Drill	Decimal	mm	Thread
11.8 mm	.4646	11.8	85%
11.9 mm	.4685	11.9	81%
15/32	.4688	11.91	81%
12 mm	.4724	12	77%
12.1 mm	.4764	12.1	73%
12.2 mm	.4803	12.2	69%
12.3 mm	.4843	12.3	65%
31/64	.4844	12.3	65%
12.4 mm	.4882	12.4	62%
12.5 mm	.4921	12.5	58%
12.6 mm	.4961	12.6	54%
1/2	.5000	12.7	50%
12.7 mm	.5000	12.7	50%
12.8 mm	.5039	12.8	46%

Neighboring sizes

Questions

What does M14 × 2.0 mean?

An ISO metric thread with a 14 mm major diameter and a 2 mm pitch (the distance from one thread crest to the next). It’s the coarse pitch for M14.

Can I use a 15/32 drill instead?

Usually. 15/32 is .4688″ against .4724″ for the 12 mm drill, which changes the thread engagement by a few percent at most.