How to define inner/outer thread - University of Arizona

How to define inner/ou

• Standard inch unit thread specificati

nominal diameter
thread form

.250 – 20 UNC – 2A in

class o
the number of

• Thread forms
UNC: Unified Coarse, most commo
UNF: Unified Fine, finer threads all
load tolerance.
UNEF: Unified national Extra Fine,
aerospace applications.

• Class fits
Class 1: Loose fit, Class 2: Standard

• Internal or external
A: external, B: internal

uter thread

ion

nternal or external
of thread fit
thread per inch

only used thread in general purposes.
lows better torque control and higher
used for ultra-precision purpose or

d fit, Class 3: Tight fit

How to define inner/ou

• Metric unit thread specification

nominal diamete
metric

M100 x 1.5 – 4h6h

pitch
metric unit indicator

• Metric thread fits
General purpose fit : 6g (external)
Close fit : 5g6g (external), 6H (inte

• Note: English unit equivalent
2A  6g, 2B  6H
3A  4h6h, 3B  4H5H

uter thread

er
c thread fits

, 6H (internal)
ernal)

How to define inner/ou

Use ‘Cosmetic thread’ in your 3D mod

Menu >
Insert >
Annotations>
Cosmetic threads…

uter thread in Solidworks

del

How to define inner/ou

Use ‘Cosmetic thread’ in your 3D mod

Select a circular edge for
cosmetic thread.

Define minor diameter
of the thread.
Define depth of the
thread.
Type thread callout

uter thread in Solidworks

del

How to define inner/ou

Use ‘Cosmetic thread’ in your 3D mod

Select a circular edge for
cosmetic thread.

Define minor diameter
of the thread.
Define depth of the
thread.
Type thread callout

uter thread in Solidworks

del

How to define inner/ou

Cosmetic thread icon

uter thread in Solidworks

How to define inner/ou

Move your mouse pointer on ‘Option’
and open the option window.

Menu >
Tools >
Options ..

In the ‘Document Properties’ tab,
there is ‘Detailing’ on the left box.
Click ‘Detailing’ and find ‘shaded
cosmetic threads’ in ‘display
category’. Check the option.

uter thread in Solidworks

How to define inner/ou
drawings

uter thread in mechanical

How to define inner/ou
drawings

Move your mouse pointer on
circular edge is highlighted.

uter thread in mechanical

n the cosmetic thread, then the
.

How to define inner/ou
drawings

Click right mouse button and s

uter thread in mechanical

select ‘Insert Callout’.

How to define inner/ou
drawings

It shows the thread callouts we d

uter thread in mechanical

defined in the callout text box.