Thread data sheet

Basic Thread Dimensions

Property Inch mm
Nominal Diameter 0.812 20.625
Pitch (TPI)32
Pitch (Distance) 0.0313 0.795
Pitch Diameter 0.7917 20.109
Minor Diameter 0.7748 19.68
Thread Height 0.0169 0.429
Addendum 0.0101 0.257
Crest (External)
Root (Internal)
0.0039 0.099
Tap Drill Size
(75% depth)
0.781 19.85
Lead Angle
(Single Start)
0.72°
Thread Family Unified Constant Pitch 32 TPI (32-UN)
Relevant Standards ASME B1.1-2003
Equivalent MetricThreadM20 X 1

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

Choose the Threading Data you want to explore


13/16 - 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

13/16 - 32 32-UN 2A (External)

* Permisable values for thread Class 2A

# Description Value (Inch) Value (mm)
es Allowance 0.001 (Ref) 0.025 (Ref)
d Major Diameter 0.805 - 0.811 20.447 - 20.599
d2 Pitch Diameter 0.7872 - 0.7907 19.995 - 20.084
d3 Minor Diameter
(UNR Only)
0.7737 (Ref) 19.652 (Ref)
α Varation of 30° anngle (+/-) 1.5°
P Varation of pitch (+/-) 0.001 (Ref) 0.025 (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


13/16 - 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 0.806 - 0.812 20.472 - 20.625
d2 Pitch Diameter 0.7891 - 0.7917 20.043 - 20.109
d3 Minor Diameter
(UNR Only)
0.7748 (Ref) 19.68 (Ref)
α Varation of 30° anngle (+/-) 1.5°
P Varation of pitch (+/-) 0.0008 (Ref) 0.02 (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


13/16 - 32 32-UN 2B (Internal)

* Permisable values for thread Class 2B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.778 - 0.786 19.761 - 19.964
D2 Pitch Diameter 0.7917 - 0.7962 20.109 - 20.223
D Major Diameter 0.8120 (Min) 20.625 (Min)
α Varation of 30° anngle (+/-) 1.5°
P Varation of Pitch (+/-) 0.0013 (Ref) 0.033 (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


13/16 - 32 32-UN 3B (Internal)

* Permisable values for thread Class 3B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.7782 - 0.7839 19.766 - 19.911
D2 Pitch Diameter 0.7917 - 0.7951 20.109 - 20.196
D Major Diameter 0.8120 (Min) 20.625 (Min)
α Varation of 30° anngle (+/-) 1.5°
P Varation of Pitch (+/-) 0.001 (Ref) 0.025 (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 13/16 - 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% 0.790 20.06
60% 0.788 20.01
65% 0.786 19.95
70% 0.784 19.90
75% 0.782 19.85
80% 0.780 19.80
85% 0.777 19.75

Over Wire Measurements for 13/16 - 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 13/16 - 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=0.812 INCH, P=0.031 INCH, L=0.313 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
G28 U0
T0100
G99 G97 S1411 M03
G00 Z5.1
G00 X25.5 M08
G76 P010060 Q8 R0
G76 X20 Z-8 P487 Q116 F1 R
G28 U0
G28 U0
M09
M30
(PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.)
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CNC Gcode Program for Thread Milling of 13/16 - 32 32-UN

The below sample Gcode is configured for:

  • Fanuc Controller
  • Internal RH Thread
  • Climb Milling
  • Cutter diameter: 70% of the thread diameter
  • Single tooth Thread Mill cutter
  • Cutting conditions for steel
  • One radial pass

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


%
O0101
(WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM)
(CONTROLER - FANUC)
(THREAD - MAJOR DIAM.=0.812 INCH, PITCH=0.03125 INCH, LENGTH=0.3125 INCH)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER DIAM=0.406 [SINGLE TOOTH])
(CUTTER COMPENSATION D=0 - TOOLPATH FOR TOOL CENTER)
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S2822 M03
G43 H1 Z25.4 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-8.0367 F2032
G91 G01 G41 D1 X2.5781 Y-2.5781 F430
G03 X2.5781 Y2.5781 Z0.0992 I0 J2.5781 F108
G03 Z0.7938 I-5.1562 J0 F215
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 Z0.7938 I-5.1562 J0
G03 X-2.5781 Y2.5781 Z0.0992 I-2.5781 J0
G01 G40 X-2.5781 Y-2.5781 F2032
G90 G00 Z25.4
M30
(PLEASE NOTE THIS GCODE HAS NOT BEEN TESTED ON YOUR MACHINE AND SETUP. WE CANNOT GUARANTEE ITS ACCURACY OR COMPATIBILITY. NOTE THAT YOU ARE USING IT AT YOUR OWN RISK, AND WE SHALL NOT BE HELD LIABLE FOR ANY DAMAGES OR LOSSES ARISING FROM THE USE OF THIS PROGRAM.)
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