Thread data sheet

Basic Thread Dimensions

Property Inch mm
Nominal Diameter 0.937 23.8
Pitch (TPI)16
Pitch (Distance) 0.0625 1.588
Pitch Diameter 0.8964 22.769
Minor Diameter 0.8626 21.91
Thread Height 0.0338 0.859
Addendum 0.0203 0.516
Crest (External)
Root (Internal)
0.0078 0.198
Tap Drill Size
(75% depth)
0.876 22.25
Lead Angle
(Single Start)
1.27°
Thread Family Unified Constant Pitch 16 TPI (16-UN)
Relevant Standards ASME B1.1-2003
Equivalent MetricThreadM24 X 1.5

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

Choose the Threading Data you want to explore


15/16 - 16 16-UNPossible Thread Classes

External Threads

2A, 3A

Metric ISO External Thread - Tolerance sketch

Internal Threads

2B, 3B

Metric ISO Internal Thread - Tolerance sketch

15/16 - 16 16-UN 2A (External)

* Permisable values for thread Class 2A

# Description Value (Inch) Value (mm)
es Allowance 0.0014 (Ref) 0.036 (Ref)
d Major Diameter 0.9262 - 0.9356 23.525 - 23.764
d2 Pitch Diameter 0.8903 - 0.895 22.614 - 22.733
d3 Minor Diameter
(UNR Only)
0.8612 (Ref) 21.874 (Ref)
α Varation of 30° anngle (+/-)
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


15/16 - 16 16-UN 3A (External)

* Permisable values for thread Class 3A

# Description Value (Inch) Value (mm)
es Allowance 0 (Ref) 0 (Ref)
d Major Diameter 0.9276 - 0.937 23.561 - 23.8
d2 Pitch Diameter 0.8929 - 0.8964 22.68 - 22.769
d3 Minor Diameter
(UNR Only)
0.8626 (Ref) 21.91 (Ref)
α Varation of 30° anngle (+/-)
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


15/16 - 16 16-UN 2B (Internal)

* Permisable values for thread Class 2B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.869 - 0.883 22.073 - 22.428
D2 Pitch Diameter 0.8964 - 0.9025 22.769 - 22.924
D Major Diameter 0.9370 (Min) 23.8 (Min)
α Varation of 30° anngle (+/-)
P Varation of Pitch (+/-) 0.0018 (Ref) 0.046 (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


15/16 - 16 16-UN 3B (Internal)

* Permisable values for thread Class 3B

# Description Value (Inch) VValue (mm)
D1 Minor Diameter 0.8693 - 0.8778 22.08 - 22.296
D2 Pitch Diameter 0.8964 - 0.901 22.769 - 22.885
D Major Diameter 0.9370 (Min) 23.8 (Min)
α Varation of 30° anngle (+/-)
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


Tap Drill Sizes for 15/16 - 16 16-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% 0.892 22.66
60% 0.888 22.56
65% 0.884 22.46
70% 0.880 22.36
75% 0.876 22.25
80% 0.872 22.15
85% 0.868 22.05

Over Wire Measurements for 15/16 - 16 16-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 0.0316 - 0.0631 0.802 - 1.604
Ideal Wire Diameter 0.0361 0.917
Possible Wires
From Standard Sets
* 0.866
* 1.01
* 1.155
* 1.443

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 15/16 - 16 16-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=0.937 INCH, P=0.0625 INCH, L=0.625 INCH)
(APPLICATION - EXTERNAL TURNING, TOWARDS CHUCK, RH TOOL, RH THREAD)
(FEED - 17 PASSES, FLANK, CONSTANT VOLUME)
(FINISH PASS - 0.0006 INCH)
(WITH CHAMFER -  NO)
G28 U0 W0
T0101 G99 G97 S1223 M03
G00 Z5.1
X 34.0 M08
G76 P010060 Q15 R0.015
G76 X21.852 Z-15.875 P974 Q232 F1.588 R0.00 
G28 U0 W0
M09
M30
%

CNC Gcode Program for Thread Milling of 15/16 - 16 16-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


%
O101
(WWW.MACHININGDOCTOR.COM - THREADMILLING PROGRAM)
(CONTROLER - FANUC)
(THREAD - D=0.937 INCH, P=0.0625 INCH, L=0.625 INCH)
(APPLICATION - INTERNAL, RH THREAD, CLIMB MILLING)
(CUTTER - D=0.4685 [SINGLE TOOTH])
N1 M06 T1
G54
G90 G40 G17 G94 G21
G00 X0 Y0 S2446 M03
G43 H1 Z25.4 M08
(M-CODE "THROUGH COOLANT ON")
(PASS 1 / 1)
G90 G01 Z-16.0734 F2032
G91 G01 G41 D1 X2.975 Y-2.975 F373
G03 X2.975 Y2.975 Z0.1984 I0 J2.975 F93
G03 Z1.5875 I-5.95 J0 F186
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 Z1.5875 I-5.95 J0
G03 X-2.975 Y2.975 Z0.1984 I-2.975 J0
G01 G40 X-2.975 Y-2.975 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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