M14 Bolt Size and Thread Specifications

The standard coarse pitch for M14 is 2.0 mm. Fine pitch is often 1.5 mm where specified.

9/16-12 is a practical imperial reference for M14; always verify against your application.

What is an M14 bolt?

An M14 bolt has 14 mm nominal diameter and 2.0 mm coarse pitch under common ISO tables. It is a standard step between M12 and M16 in large equipment.

M14 is used in heavy machinery and larger assemblies where higher clamp loads and shank area are required. Spanish reference: perno M14.

Specification	Value
Nominal diameter	14 mm
Standard pitch (coarse)	2.0 mm
Fine pitch	1.5 mm
Tap drill size	12.0 mm
Closest imperial equivalent	9/16-12

Bolt size	Hex head size
M14	22 mm

Machine frames, shafts, presses, and industrial equipment with medium-to-heavy loads.

Universal Screw & Bolt Size Chart — metric, imperial, pitch, and tap drill in one view.
Tap Drill Chart — metric tap drill sizes.

The common coarse pitch for M14 is 2.0 mm. Fine pitch is often 1.5 mm where specified.

For M14 x 2.0 coarse thread, use approximately a 12.0 mm tap drill. Use our Tap Drill Calculator for other pitches.

9/16-12 is a practical reference for comparing M14 to inch hardware; verify fit for your application.