1/2 (12.7mm) Outer Diameter

Shopping Options

Outer Diameter

1. 3/8 in.----------9.53mm (1)
2. 7/16 In.--------11.1mm (39)
3. 1/2 in.---------12.7mm (60)

Bolt Hole Size / Inner DIameter

1. For 5/16" or 8mm Bolts (89)
2. For 5/16 or 8mm Loose fit (9)

Length Decimal/Fraction/Metric

1. 0.094 in.----3/32---2.38mm (1)
2. 0.118 in.-------------3mm (2)
3. 0.125 in.-----1/8----3.18mm (1)
4. 0.141 in.----9/64---3.58mm (4)
5. 0.156 in.----5/32---3.96mm (2)
6. 0.172 in.---11/64---4.37mm (1)
7. 0.1875 in.---3/16---4.76mm (3)
8. 0.203 in.---13/64---5.16mm (2)
9. 0.208 in.-------------5.28mm (1)
10. 0.219 in.----7/32----5.56mm (2)
11. 0.225 in.-------------5.72mm (1)
12. 0.2345 in.--15/64--5.95mm (2)
13. 0.250 in.-----1/4----6.35mm (4)
14. 0.260 in.----------- (1)
15. 0.2655 in.--17/64--6.75mm (2)
16. 0.281 in.----9/32---7.14mm (2)
17. 0.297 in.---19/64---7.54mm (2)
18. 0.3125 in.---5/16---7.94mm (4)
19. 0.328 in.---21/64---8.33mm (2)
20. 0.344 in.---11/32---8.74mm (2)
21. 0.354 in.-------------9mm (1)
22. 0.375 in.-----3/8----9.53mm (3)
23. 0.380 in.-------------9.65mm (1)
24. 0.394 in.-------------10mm (2)
25. 0.402 in.-------------10.21mm (1)
26. 0.405 in.-------------10.28mm (1)
27. 0.406 in.---13/32---10.31mm (2)
28. 0.4375 in.---7/16---11.11mm (3)
29. 0.450 in.-------------11.43mm (1)
30. 0.453 in.---29/64---11.5mm (1)
31. 0.469 in.---15/32---11.91mm (3)
32. 0.475 in.----------- (1)
33. 0.500 in.-----1/2----12.7mm (4)
34. 0.531 in.---17/32---13.49mm (3)
35. 0.551 in.-------------14mm (1)
36. 0.555 in.-------------14.1mm (1)
37. 0.5625 in.---9/16---14.29mm (4)
38. 0.625 in.-----5/8----15.88mm (3)
39. 0.6875 in.--11/16--17.46mm- (2)
40. 0.750 in.----3/4-----19.05mm (3)
41. 0.788 in.-------------20mm (1)
42. 0.875 in.----7/8-----22.23mm (3)
43. 0.9375 in.--15/16--23.81mm (2)
44. 1 inch---------1-----25.4mm (3)
45. 1.0625 in.-1-1/16--27mm- (1)
46. 1.125 in.---1-1/8---28.58mm (1)
47. 1.156 in.--1-5/32---29.36mm (1)
48. 1.1875 in.--1-3/16-30.16mm (1)
49. 1.250 in.---1-1/4---31.75mm (1)
50. 1.3125 in.-1-5/16--33.34mm (1)
51. 1.375 in.---1-3/8---34.93mm (1)
52. 1.4375 in.--1-7/16-36.51mm (1)
53. 1.500 in.---1-1/2---38.1mm (1)

Metal Alloy

1. Aluminum 6061-T6 (97)
2. Steel (3)