Hole for 1/4" Bolts

Shopping Options

Outer Diameter

1. 5/16 in.--------7.94mm (23)
2. 3/8 in.----------9.53mm (61)
3. 7/16 In.--------11.1mm (52)
4. 1/2 in.---------12.7mm (60)
5. 5/8 in.---------15.9mm (44)
6. 3/4 in.---------19.05mm (31)

Bolt Hole Size / Inner DIameter

1. For #12 or 5mm Screws (3)
2. For 6mm or #12 Screws (1)
3. For 6mm or #12 Screws (11)
4. For 1/4" or 6mm Bolts (243)
5. 9/32 in. (7.14mm) (5)
6. .300 (7.6mm) (1)
7. .312 in (7.92mm) (1)
8. For 5/16 or 8mm Loose fit (1)
9. For 10mm or 3/8" Bolts (2)

Length Decimal/Fraction/Metric

1. 0.0625 in.---1/16--1.59mm (2)
2. 0.1095 in.---7/64---2.77mm (1)
3. 0.118 in.-------------3mm (1)
4. 0.125 in.-----1/8----3.18mm (8)
5. 0.134 in.----------- (1)
6. 0.141 in.----9/64---3.58mm (5)
7. 0.145 in.----------- (1)
8. 0.156 in.----5/32---3.96mm (6)
9. 0.1575 in.-----------4mm (1)
10. 0.172 in.---11/64---4.37mm (4)
11. 0.1875 in.---3/16---4.76mm (7)
12. 0.203 in.---13/64---5.16mm (3)
13. 0.210 in.-------------5.33mm (1)
14. 0.210 in.------5.94 (1)
15. 0.219 in.----7/32----5.56mm (4)
16. 0.2345 in.--15/64--5.95mm (4)
17. 0.250 in.-----1/4----6.35mm (12)
18. 0.2655 in.--17/64--6.75mm (3)
19. 0.275 in.----------- (1)
20. 0.281 in.----9/32---7.14mm (5)
21. 0.297 in.---19/64---7.54mm (4)
22. 0.306 in.------------ (1)
23. 0.3125 in.---5/16---7.94mm (8)
24. 0.315 in.-------------8mm (1)
25. 0.328 in.---21/64---8.33mm (3)
26. 0.335 in.----------- (1)
27. 0.344 in.---11/32---8.74mm (5)
28. 0.354 in.-------------9mm (1)
29. 0.375 in.-----3/8----9.53mm (11)
30. 0.380 in.-------------9.65mm (1)
31. 0.406 in.---13/32---10.31mm (6)
32. 0.433 in.-------------11mm (1)
33. 0.4375 in.---7/16---11.11mm (8)
34. 0.469 in.---15/32---11.91mm (5)
35. 0.472 in.-------------12mm (1)
36. 0.500 in.-----1/2----12.7mm (10)
37. 0.500 in.-----1/2----12.7mm (1)
38. 0.505 in.-------------12.83mm (2)
39. 0.531 in.---17/32---13.49mm (5)
40. 0.5625 in.---9/16---14.29mm (6)
41. .565 in.-------14.95 (1)
42. 0.567 in.-------------14.40mm (1)
43. 0.594 in.---19/32---15.08mm (2)
44. 0.600 in.-------------15.24mm (1)
45. 0.625 in.-----5/8----15.88mm (7)
46. 0.630 in.-------------16mm (1)
47. 0.6405 in.--41/64--16.27mm (1)
48. 0.650 in.-------------16.51mm (1)
49. 0.656 in.---21/32---16.66mm (1)
50. 0.6875 in.--11/16--17.46mm- (5)
51. 0.748 in.-------------19mm (1)
52. 0.750 in.----3/4-----19.05mm (9)
53. 0.8125 in.--13/16--20.64mm (5)
54. 0.875 in.----7/8-----22.23mm (8)
55. 0.900 in.-------------22.86mm (1)
56. 0.906 in.---29/32---23.02mm (4)
57. 0.9375 in.--15/16--23.81mm (5)
58. 0.965 in.----------- (1)
59. 0.969 in.---31/32---24.61mm (1)
60. 0.975 in.-------------24.77mm (1)
61. 1 inch---------1-----25.4mm (12)
62. 1.010 in.-------------25.65mm (1)
63. 1.024 in.-------------26mm (2)
64. 1.0625 in.-1-1/16--27mm- (4)
65. 1.103 in.-------------28mm (2)
66. 1.125 in.---1-1/8---28.58mm (5)
67. 1.142 in.-------------29mm (1)
68. 1.172 in.----------- (1)
69. 1.181 in.-------------30mm (2)
70. 1.1875 in.--1-3/16-30.16mm (5)
71. 1.236 in.-------------31.39mm (1)
72. 1.242 in------------ (1)
73. 1.250 in.---1-1/4---31.75mm (7)
74. 1.3125 in.-1-5/16--33.34mm (4)
75. 1.375 in.---1-3/8---34.93mm (4)
76. 1.4375 in.--1-7/16-36.51mm (4)
77. 1.4845 in.-1-31/64-37.70mm (1)
78. 1.500 in.---1-1/2---38.1mm (4)
79. 1.654 in.-------------42mm (1)

Metal Alloy

1. Aluminum 6061-T6 (262)
2. Steel (3)
3. Steel (zinc plated) (1)
4. Brass (4)
5. Stainless Steel 303/18-8 (1)