M16 Bolt Size and Thread Specifications

Q: What is the standard pitch for an M16 bolt?

The standard coarse pitch for M16 is 2.0 mm. Fine pitch is often 1.5 mm where specified.

Q: What imperial fastener is closest to M16?

5/8-11 is a practical imperial reference for M16; always verify against your application.

What is an M16 bolt?

An M16 bolt has 16 mm nominal diameter with 2.0 mm coarse pitch in typical ISO listings. Fine pitches such as 1.5 mm are used when specified.

M16 is widely used in structural steel, large machinery, and heavy flanges where high preload and durable threads are required. Spanish reference: perno M16.

Specifications

Specification	Value
Nominal diameter	16 mm
Standard pitch (coarse)	2.0 mm
Fine pitch	1.5 mm
Tap drill size	14.0 mm
Closest imperial equivalent	5/8-11

Hex head size

Bolt size	Hex head size
M16	24 mm

Common uses

Steel construction, machine tools, large flanges, and heavy-duty mechanical joints.

Related tools

Metric to Imperial Screw Converter — compare M16 to common inch threads.
Tap Drill Calculator — tap drill size for M16 and other metric threads.
Thread Identifier Tool — match measured diameter and pitch to a standard.

Related charts

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

FAQ

What is the standard pitch for an M16 bolt?

The common coarse pitch for M16 is 2.0 mm. Fine pitch is often 1.5 mm where specified.

What drill size should be used for tapping M16 threads?

For M16 x 2.0 coarse thread, use approximately a 14.0 mm tap drill. Use our Tap Drill Calculator for other pitches.

What imperial fastener is closest to M16?

5/8-11 is a practical reference for comparing M16 to inch hardware; verify fit for your application.

Related guide

Metric vs Imperial Fasteners