Vintage Knowledge - Spanner Sizes

 

When you don't think you have the spanner to fit, consult the table for the bodgers guide to the next nearest size!

 

Inches

mm

Spanner

0.25

6.35

1/4" AF

0.276

7

7mm

0.313

7.95

5/16" AF

0.315

8

8mm

0.344

8.74

11/32" AF, 1/8" BSW, 3/16 BSF

0.354

9

9mm

0.375

9.53

3/8" AF

0.394

10

10mm

0.433

11

11mm

0.438

11.13

7/16" AF

0.445

11.30

3/16" BSW, 1/4 BSF

0.472

12

12mm

0.5

12.70

1/2" AF

0.512

13

13mm

0.525

6.35

1/4" BSW, and 5/16" BSF

0.551

14

14mm

0.563

14.30

9/16" AF

0.591

15

15mm

0.6

15.24

5/16" BSW, and 3/8" BSF

0.625

15.88

5/8" AF

0.63

16

16mm

0.669

17

17mm

0.686

17.42

11/16" AF

0.709

18

18mm

0.71

18.03

3/8" BSW, and 7/16" BSF

0.748

19

19mm

0.75

19.05

3/4" AF

0.787

20

20mm

0.813

20.65

13/16" AF

0.82

20.83

7/16" BSW, and 1/2" BSF

0.826

21

21mm

0.866

22

22mm

0.875

22.23

7/8" AF

0.905

23

23mm

0.92

23.37

1/2" BSW, and 9/16" BSF

0.938

23.83

15/16" AF

0.945

24

24mm

0.984

25

25mm

1

25.40

1" AF

1.01

25.65

9/16" BSW, and 5/8" BSF

1.024

26

26mm

1.063

27

11/16 AF; 27mm

1.1

27.94

5/8" BSW, and 11/16" BSF

1.125

28.58

1 1/8 AF

1.181

30

30mm

1.2

30.48

11/16" BSW, and 3/4" BSF

1.25

31.75

1 1/4" AF

1.26

32

32mm

1.3

33.02

3/4" BSW, and 7/8" BSF

1.313

33.35

1 5/16" AF

1.39

35.31

13/16" BSW; and 15/16" BSF

1.417

36

36mm

1.418

36.02

1 7/16" AF

1.48

37.59

7/8" BSW, and 1" in BSF

1.5

38.10

1 1/2" AF

1.575

40

15/16" AF; and 40mm exactly

1.614

41

41mm

1.625

41.28

1 5/8 AF

1.67

42.42

1" BSW; and 1 1/8" BSF

1.688

42.88

1 11/16" AF

1.811

46

46mm

1.813

46.05

1 13/16" AF

1.86

47.24

1 1/8" BSW; 1 1/4 BSF

1.875

47.63

1 7/8" AF

1.969

50

50mm


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