Thread data sheet

Basic Thread Dimensions

Property Inch mm
Nominal Diameter 0.312 7.925
Pitch (TPI)32
Pitch (Distance) 0.0313 0.795
Pitch Diameter 0.2917 7.409
Minor Diameter 0.2748 6.98
Thread Height 0.0169 0.429
Addendum 0.0101 0.257
Crest (External)
Root (Internal)
0.0039 0.099
Tap Drill Size
(75% depth)
0.281 7.15
Lead Angle
(Single Start)
1.96°
Thread Family Unified Constant Pitch 32 TPI (32-UN)
Relevant Standards ASME B1.1-2003
Equivalent MetricThreadM8 X 0.75

For more threading data scroll down, or use the Thread Calculator

Choose the Threading Data you want to explore


5/16 - 32 32-UNPossible Thread Classes

External Threads

2A, 3A

Metric ISO External Thread - Tolerance sketch

Internal Threads

2B, 3B

Metric ISO Internal Thread - Tolerance sketch

5/16 - 32 32-UN 2A (External)

* Permisable values for thread Class 2A

# Description Value (Inch) Value (mm)
es Allowance 0.0009 (Ref) 0.023 (Ref)
d Major Diameter 0.3051 - 0.3111 7.75 - 7.902
d2 Pitch Diameter 0.2877 - 0.2908 7.308 - 7.386
d3 Minor Diameter
(UNR Only)
0.2739 (Ref) 6.957 (Ref)
α Varation of 30° anngle (+/-) 1.5°
P Varation of pitch (+/-) 0.0009 (Ref) 0.023 (Ref)

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'

* Back to Thread Class Selection


5/16 - 32 32-UN 3A (External)

* Permisable values for thread Class 3A

# Description Value (Inch) Value (mm)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 0.306 - 0.312 7.772 - 7.925
d2 Pitch Diameter 0.2894 - 0.2917 7.351 - 7.409
d3 Minor Diameter
(UNR Only)
0.2748 (Ref) 6.98 (Ref)
α Varation of 30° anngle (+/-) 1.5°
P Varation of pitch (+/-) 0.0007 (Ref) 0.018 (Ref)

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator'

* Back to Thread Class Selection


5/16 - 32 32-UN 2B (Internal)

* Permisable values for thread Class 2B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.278 - 0.286 7.061 - 7.264
D2 Pitch Diameter 0.2917 - 0.2957 7.409 - 7.511
D Major Diameter 0.3120 (Min) 7.925 (Min)
α Varation of 30° anngle (+/-) 1.5°
P Varation of Pitch (+/-) 0.0012 (Ref) 0.03 (Ref)

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator

* Back to Thread Class Selection


5/16 - 32 32-UN 3B (Internal)

* Permisable values for thread Class 3B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.2782 - 0.2842 7.066 - 7.219
D2 Pitch Diameter 0.2917 - 0.2947 7.409 - 7.485
D Major Diameter 0.3120 (Min) 7.925 (Min)
α Varation of 30° anngle (+/-) 1.5°
P Varation of Pitch (+/-) 0.0009 (Ref) 0.023 (Ref)

* Values are calculated for Length of engagement of 5xPitch. For calculations of different engagement length use the Thread Calculator

* Back to Thread Class Selection


Tap Drill Sizes for 5/16 - 32 32-UN

  • If not specified, assume a thread depth of 75%.
  • You can learn more about thread depth in tapping here.
  • To get the tap drill size in other depths, use our Tap Drill Size Calculator .
Thread Depth Tap Drill Size (Inch) Tap Drill Size (mm)
55% 0.290 7.36
60% 0.288 7.31
65% 0.286 7.25
70% 0.284 7.20
75% 0.282 7.15
80% 0.280 7.10
85% 0.277 7.05

Over Wire Measurements for 5/16 - 32 32-UN


* OverWire is a measuring method to obatin the pitch diameter of threads. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. You can learn more about it here

Inch mm
Permissible Wire Diameter Range 0.0158 - 0.0316 0.402 - 0.803
Ideal Wire Diameter 0.0181 0.459
Possible Wires
From Standard Sets
* 0.016
* 0.018
* 0.0193
* 0.0206
* 0.0214
* 0.0222
* 0.0241
* 0.0262
* 0.0289
* 0.404
* 0.433
* 0.462
* 0.52
* 0.577
* 0.722

Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter (Depending on the class). Use our Over Wire Calculator to find out!


CNC Gcode Program for Turning of 5/16 - 32 32-UN

The below sample Gcode is configured for:

  • Fanuc Controller
  • External RH Thread
  • Right hand tool, machining towards the chuck
  • Flank Infeed method with contant volume
  • Flank Infeed method with contant volume
  • Cutting conditions for steel
  • Default number of passes

You can configure all the above parameters and much more in our Thread Turning Gcode Generator


%
O0100
(MACHINING DOCTOR - THREADING CNC PROGRAM)
(CONTROLER - FANUC A)
(THREAD - D=0.312 INCH, P=0.03125 INCH, L=0.3125 INCH)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 17 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.0003 INCH)
(WITH CHAMFER -  NO)
G28 U0 W0
T0101 G99 G97 S1224 M03
G00 Z5.1
X 18.1 M08
G76 P010060 Q8 R0.008
G76 X6.951 Z-7.938 P487 Q116 F0.794 R0.00 
G28 U0 W0
M09
M30
%
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