09-10-2014  (3801 ) Categoria: Mechanics

Whitworth BSW/BSF/BSP & Metric thread sizes

Whitworth thread sizes[4]
Whitworth size (in) Core diameter (in) Threads per inch Pitch (in) Tapping drill size
1/16 0.0411 60 0.0167 Number Drill 56 (1.2 mm)
3/32 0.0672 48 0.0208 Number Drill 49 (1.85 mm)
1/8 0.0930 40 0.025 Number Drill 39 (2.55 mm)
5/32 0.1162 32 0.0313 Number Drill 30 (3.2 mm)
3/16 0.1341 24 0.0417 Number Drill 26 (3.7 mm)
7/32 0.1654 24 0.0417 Number Drill 16 (4.5 mm)
1/4 0.1860 20 0.05 Number Drill 9 (5.1 mm)
5/16 0.2414 18 0.0556 Letter Drill F (6.5 mm)
3/8 0.2950 16 0.0625 5/16 in (7.94 mm)
7/16 0.3460 14 0.0714 Letter Drill U (9.3 mm)
1/2 0.3933 12 0.0833 Letter Drill Z (10.5 mm)
9/16 0.4558 12 0.0833 12.1 mm (0.4764 in)
5/8 0.5086 11 0.0909 13.5 mm (0.5315 in)
11/16 0.5711 11 0.0909 15 mm (0.5906 in)
3/4 0.6219 10 0.1 16.27 mm (0.6406 in)
13/16 0.6845 10 0.1 18 mm (0.7087 in)
7/8 0.7327 9 0.1111 19.25 mm (0.7579 in)
15/16 0.7953 9 0.1111 20.75 mm (0.8169 in)
1 0.8399 8 0.125 22 mm (0.8661 in)
1 1/8 0.9420 7 0.1429
1 1/4 1.0670 7 0.1429
1 1/2 1.2866 6 0.1667
1 3/4 1.4939 5 0.2
2 1.7154 4.5 0.2222
2 1/2 2.180 4 0.250

BSF threads (use the 55 degree Whitworth thread form).

fractional inches decimal inches thread per inch BSC match Jaw mm exact or ~inch drill for tap
3/16 0.19 32tpi `= 8.59mm 11/32" 6pt 5/32"
7/32 0.22 28tpi
? ? 4.6mm
1/4 0.25 26tpi `= 11.30mm -- 5.3mm
5/16 0.31 22tpi
13.34mm 17/32" 17/64"
3/8 0.375 20tpi
15.24mm 5/8" 8.2mm
7/16 0.44 18tpi
18.03mm -- 9.7mm
1/2 0.50 16tpi
20.83mm 13/16 7/16"
9/16 0.56 16tpi
23.37mm 15/16 1/2"
5/8 0.63 14tpi
25.65mm 1" 6pt 14mm
11/16 0.69 14tpi
27.94mm 1'1/8" 6pt 15.5mm
3/4 0.75 12tpi
30.48mm 1"1/4 6pt 16.75mm
7/8 0.88 11tpi
33.02mm 1"5/16 25/32"
1" 1.00 10tpi
37.59mm 1"1/2 22.75mm
1â…›" 1.13 9tpi
42.42mm 1"11/16 26.50mm
1¼" 1.25 9tpi
47.24mm 1"7/8 28.75mm
1½" 1.50 8tpi
56.39mm 2"1/4 34.50mm
Dash
thread
size		 BSP
size
(in)		 Thread pitch Thread major
diameter		 Thread minor
diameter[1][2]		 A/F
(mm)		 Gauge
length
(mm)
Corresponding pipe Tapping drill
size (mm)
/in
(TPI)		 (mm) (mm) (in) (mm) (in) DN
(mm)		 OD
(mm)		 OD
(in)		 Thickness
(mm)		 BSP.PL
(Rp)		 BSP.F
(G)
−1 1â„16 28 0.907 7.723 0.304 6.561 0.2583
4±0.9



6.60 6.80
−2 1â„8 28 0.907 9.728 0.383 8.565 0.3372 15 4±0.9 6 10.2 0.40 2 8.60 8.80
−4 1â„4 19 1.337 13.157 0.518 11.445 0.4506 19 6±1.3 8 13.5 0.53 2.3 11.50 11.80
−6 3â„8 19 1.337 16.662 0.656 14.950 0.5886 22/23 6.4±1.3 10 17.2 0.68 2.3 15.00 15.25
−8 1â„2 14 1.814 20.955 0.825 18.633 0.7336 27 8.2±1.8 15 21.3 0.84 2.6 18.75 19.00
−10 5â„8 14 1.814 22.911 0.902 20.589 0.8106

16

2.6 - 21.00
−12 3â„4 14 1.814 26.441 1.041 24.120 0.9496 32 9.5±1.8 20 26.9 1.06 2.6 24.25 24.50
−16 1 11 2.309 33.249 1.309 30.292 1.1926 43 10.4±2.3 25 33.7 1.33 3.2 30.40 30.75
−20 1 1â„4 11 2.309 41.910 1.650 38.953 1.5336 53 12.7±2.3 32 42.4 1.67 3.2 39.00 39.50
−24 1 1â„2 11 2.309 47.803 1.882 44.846 1.7656 57 12.7±2.3 40 48.3 1.90 3.2 45.00 45.00
−32 2 11 2.309 59.614 2.347 56.657 2.2306 70 15.9±2.3 50 60.3 2.37 3.6 56.75 57.00
−40 2 1â„2 11 2.309 75.184 2.960 72.227 2.8436
17.5±3.5 65 76.1 3.00 3.6

−48 3 11 2.309 87.884 3.460 84.927 3.3436
20.6±3.5 80 88.9 3.50 4

−64 4 11 2.309 113.030 4.450 110.073 4.3336
25.5±3.5 100 114.3 4.50 4.5

−80 5 11 2.309 138.430 5.450 135.472 5.3335
28.6±3.5 125 139.7 5.50 5

−96 6 11 2.309 163.830 6.450 160.872 6.3335
28.6±3.5 150 165.1 6.50 5



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