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Screw Pitch Gauges

Screw Pitch Gauge

A screw pitch gauge is the perfect tool to identify exact TPI or pitch.

The bolt diameter should be measured and matched to the closest size over, relating to the TPI ( threads per inch)  or pitch of the thread.

In general, major diameter of bolt or male thread will always be slightly less than the exact diameter listed in the thread identification and drill chart .

how to identify threads  
 

Metric 60 °

Metric threads have a 60 ° pitch angle

metric screw pitch gage

SPG 0.20-6.0mm

(25 leaves) .2 .25. 3 .35 .4 .45 .5 .6 .7 .75 .8 .9 1.0 1.25 1.5 1.75 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

metric screw pitch gauge

SPG 0.25-2.5mm

(28 leaves) .25 .3 .35 .4 .45 .5 .55 .6 .65 .7 .75 .8 .85 .9 1.0 1.1 1.2 1.25 1.3 1.4 1.5 1.7 1.75 1.8 1.9 2.0 2.5

mtric screw pitch gage

SPG 0.25-6.0mm

SPG 0.25-6.0mm (24 leaves) .25. 3 .35 .4 .45 .5 .6 .7 .75 .8 .9 1.0 1.25 1.5 1.75 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

 
 

Combined Gauges

Combined Unified and Metric

SPG-UN-M

Combined Unified and Metric (55 leaves)

0.25-6.0mm & 4-42 TPI inch

Metric- .25. 3 .35 .4 .45 .5 .6 .7 .75 .8 .9 1.0 1.25 1.5 1.75 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

Inch- 4 4.5 5 5.5 6 7 8 9 10 11 11.5 12 13 14 15 16 18 20 22 24 25 26 27 28 30 32 36 38 40 42 TPI

combined metric and whitworth

SPG-WM52

Combined Metric and Whitworth (52 leaves)

0.25-6.0mm & 4-62 TPI 55° Whitworth

Metric- .25. 3 .35 .4 .45 .5 .6 .7 .75 .8 .9 1.0 1.25 1.5 1.75 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

Whitworth- 4 4.5 5 6 7 8 9 10 11 12 13 14 16 18 19 20 22 24 25 26 27 28 30 32 36 38 40 48 60 62 TPI

...

SPG M-BSP

Combined Metric and BSP (7 leaves)

Metric- 1.0 1.5 2.0

BSP- 11 14 19 28

 
 

British Thread Form

BSP, BSPT, BSW, BSF & BSB threads have 55° pitch angle.

BA threads have 47.5° pitch angle

ba screw pitch gauge

SPG 0-10 BA

(12 leaves) 0 1 2 3 4 5 6 7 8 9 10 with 47.5° angle leaf

bsp screw pitch gauge

SPG BSP

(6 leaves) 8 10 11 14 19 28 TPI

whitworth screw pitch guage

SPG W4-62

(28 leaves) 4 4.5 5 6 7 8 9 10 11 12 13 14 16 18 19 20 22 24 25 26 28 30 32 36 40 48 60 62 TPI

 
 

American Unified (Inch) Screw Pitch Gauges

Unified threads have a 60 ° pitch angle

inch american unified screwpitch gage

SPG 12-80 TPI

(16 leaves) 12 14 16 18 20 24 28 32 36 40 44 48 56 64 72 80 TPI

4-42 TPi screw pitch gage

SPG 4-42 TPI

(31 leaves) 4 4.5 5 5.5 6 7 8 9 10 11 11.5 12 13 14 15 16 18 20 22 24 25 26 27 28 30 32 36 38 40 42 TPI

4-64 tpi screw pitch gage

SPG 4-64 TPI

(22 leaves) 4 4.5 5 6 7 8 9 10 11 11.5 12 13 14 16 18 20 22 24 32 40 48 56 64 TPI

4-80 tpi screw pitch gage

SPG 4-80 TPI

(27 leaves) 4 4.5 5 6 7 8 9 10 11 11.5 12 13 14 16 18 20 27 28 32 36 40 44 48 56 64 72 80 TPI

4-84 tpi screw pitch gage

SPG 4-84 TPI

(52 leaves) 4 4.5 5 5.5 6 7 8 9 10 11 11.5 12 13 14 15 16 18 20 22 24 25 26 27 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 TPI

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Trademarks are the properties of their respective owner(s).

June 2023

The descriptions, illustrations, specifications, dimensions, and part numbers are subject to change without notice.


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