M68 Metric Thread Dimensions and Pitch

Below are the key dimensions for M68 metric threads: pitch, tap drill and clearance drill according to ISO 724:2023.

M68 Coarse (standard)

M68 Pitch:  6mm
M68 Tap Drill:  62mm
M68 Clearance Drill:  74mm
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M68 Metric Thread

M68 ISO metric thread profile illustration

Welcome to our M68 Metric Thread Page, your indispensable hub for immediate assessments on M68 metric threads. We've gathered an extensive database for all the standard metric threads you'll need for your components, focusing on critical dimensions such as thread pitch, tap drill, and clearance drill. This page is a comprehensive solution for engineers, machinists, and hobbyists seeking accurate, reliable data.

M68 Coarse Pitch Dimensions

Nominal Size
d=D
p
r
d2=D2
d3
D1
h3
H1
Tap Drill
M68
68
6
0.866
64.103
60.639
61.505
3.681
3.248
62
All dimensions stated in are mm (millimetre)

M68 Fine Pitch Dimensions

| Nominal Size | d=D | p | r | d2=D2 | d3 | D1 | h3 | H1 | Tap Drill | |--------------|-----|-----|-------|--------|--------|--------|-------|-------|-----------| | M68x1.5 | 68 | 1.5 | 0.217 | 67.026 | 66.16 | 66.376 | 0.92 | 0.812 | 66.5 | | M68x2.0 | 68 | 2 | 0.289 | 66.701 | 65.546 | 65.835 | 1.227 | 1.083 | 66 | | M68x3.0 | 68 | 3 | 0.433 | 66.051 | 64.319 | 64.752 | 1.84 | 1.624 | 65 | | M68x4.0 | 68 | 4 | 0.577 | 65.402 | 63.093 | 63.67 | 2.454 | 2.165 | 64 |

All dimensions stated in are mm (millimetre)

ISO Metric Thread profile

d=D: Major Diameter
p: Pitch
r: Root Radius
d2=D2: Pitch Diameter
d3: Minor Diameter Male Thread
D1: Minor Diameter Female Thread
h3: Thread Height Male
H1: Thread Height Female

Major Diameter

The Major Diameter is the largest diameter on the thread and is measured from the thread crest to crest (peak of the thread).

Pitch

This is the distance (mm) from one thread to the next, this can be measured from tip to tip or groove to groove. Pitch can also be defined as TPI, which stands for threads per inch.

Minor Diameter

Minor Diameter is the smallest diameter on the thread and is measured from the thread root to root (Bottom of the thread).

Thread Angle

The angle between the thread faces. 60 degrees in the example above.

Right-Hand Thread

The thread will assemble when rotated clockwise. "righty tighty lefty loosely"

Left-Hand Thread

The thread will assemble when rotated counter-clockwise.

Frequently Asked Questions

What is the pitch of an M68 thread?

The pitch for an M68 thread is 6 mm.

What is the tap drill for an M68 thread?

The tap drill for an M68 thread is 62 mm.

What size is a clearance hole for an M68 thread?

The clearance drill for an M68 thread is 74 mm.

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