Hole for 1/4" Bolts

Shopping Options

Outer Diameter

1. 5/16 in.--------7.94mm (4)
2. 3/8 in.----------9.53mm (22)
3. 7/16 In.--------11.1mm (8)
4. 1/2 in.---------12.7mm (27)
5. 5/8 in.---------15.9mm (19)
6. 3/4 in.---------19.05mm (19)

Bolt Hole Size / Inner DIameter

1. For 1/4" or 6mm Bolts (99)

Length Decimal/Fraction/Metric

1. 0.100 in.-------------2.54mm (1)
2. 0.125 in.-----1/8----3.18mm (5)
3. 0.1875 in.---3/16---4.76mm (6)
4. 0.219 in.----7/32----5.56mm (1)
5. 0.250 in.-----1/4----6.35mm (7)
6. 0.3125 in.---5/16---7.94mm (6)
7. 0.344 in.---11/32---8.74mm (1)
8. 0.375 in.-----3/8----9.53mm (7)
9. 0.406 in.---13/32---10.31mm (1)
10. 0.4375 in.---7/16---11.11mm (4)
11. 0.469 in.---15/32---11.91mm (1)
12. 0.500 in.-----1/2----12.7mm (5)
13. 0.531 in.---17/32---13.49mm (1)
14. 0.5625 in.---9/16---14.29mm (3)
15. 0.625 in.-----5/8----15.88mm (5)
16. 0.6875 in.--11/16--17.46mm- (1)
17. 0.750 in.----3/4-----19.05mm (7)
18. 0.8125 in.--13/16--20.64mm (3)
19. 0.875 in.----7/8-----22.23mm (6)
20. 0.906 in.---29/32---23.02mm (1)
21. 1 inch---------1-----25.4mm (4)
22. 1.0625 in.-1-1/16--27mm- (2)
23. 1.125 in.---1-1/8---28.58mm (3)
24. 1.1875 in.--1-3/16-30.16mm (1)
25. 1.250 in.---1-1/4---31.75mm (6)
26. 1.375 in.---1-3/8---34.93mm (3)
27. 1.4375 in.--1-7/16-36.51mm (2)
28. 1.500 in.---1-1/2---38.1mm (6)