Certified Aircraft Bolts

We stock AN, MS, NAS Certified Bolts

We stock more sizes/length bolts not listed here 1-800-736-4123

AN BOLT DIMENSIONS

AN Bolt Guages available from Aircraft Spruce or elswhere on this Web Site

AN No.

AN3

AN4

AN5

AN6

AN7

AN8

Diam.

3/16"
(.186 -.189)

1/4"
(.246 - .249)

5/16"
(.309 -.312)

3/8"
(.371 - .374)

7/16"
(.433 -.437)

1/2"
(.459 - .499)

DASH NO.

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

GRIP
+1/64
-1/64

LENGTH
+ 1/32
- 1/64

3

1/16

15/32

1/16

15/32

4

1/8

17/32

1/16

17/32

1/16

19/32

5

1/4

21/32

3/16

21/32

3/16

23/32

1/16

45/64

1/16

23/32

6

3/8

25/32

5/16

25/32

5/16

27/32

3/16

53/64

3/16

27/32

1/16

27/32

7

1/2

29/32

7/16

29/32

7/16

31/32

5/16

61/64

5/16

31/32

3/16

31/32

10

5/8

1-1/32

9/16

1-1/32

9/16

1-3/32

7/16

1-5/64

7/16

1-3/32

5/16

1-3/32

11

3/4

1-5/32

11/16

1-5/32

11/16

1-7/32

9/16

1-13/64

9/16

1-7/32

7/16

1-7/32

12

7/8

1-9/32

13/16

1-9/32

13/16

1-11/32

11/16

1-21/64

11/16

1-11/32

9/16

1-11/32

13

1

1-13/32

15/16

1-13/32

15/16

1-15/32

13/16

1-29/64

13/16

1-15/32

11/16

1-15/32

14

1-1/8

1-17/32

1-1/16

1-17/32

1-1/16

1-19/32

15/16

1-37/64

15/16

1-19/32

13/16

1-19/32

15

1-1/4

1-21/32

1-3/16

1-21/32

1-3/16

1-23/32

1-1/16

1-45/64

1-1/16

1-23/32

15/16

1-23/32

16

1-3/8

1-25/32

1-5/16

1-25/32

1-5/16

1-27/32

1-3/16

1-53/64

1-3/16

1-27/32

1-1/16

1-27/32

17

1-1/2

1-29/32

1-7/16

1-29/32

1-7/16

1-31/32

1-5/16

1-61/64

1-5/16

1-31/32

1-3/16

1-31/32

20

1-5/8

2-1/32

1-9/16

2-1/32

1-9/16

2-3/32

1-7/16

2-5/64

1-7/16

2-3/32

1-5/16

2-3/32

21

1-3/4

2-5/32

1-11/16

2-5/32

1-11/16

2-7/32

1-9/16

2-13/64

1-9/16

2-7/32

1-7/16

2-7/32

22

1-7/8

2-9/32

1-13/16

2-9/32

1-13/16

2-11/32

1-11/16

2-21/64

1-11/16

2-11/32

1-9/16

2-11/32

23

2

2-13/32

1-15/16

2-13/32

1-15/16

2-15/32

1-13/16

2-29/64

1-13/16

2-15/32

1-11/16

2-15/32

24

2-1/8

2-17/32

2-1/16

2-17/32

2-1/16

2-19/32

1-15/16

2-37/64

1-15/16

2-19/32

1-13/16

2-19/32

25

2-1/4

2-21/32

2-3/16

2-21/32

2-3/16

2-23/32

2-1/16

2-45/64

2-1/16

2-23/32

1-15/16

2-23/32

26

2-3/8

2-25/32

2-5/16

2-25/32

2-5/16

2-27/32

2-3/16

2-53/64

2-3/16

2-27/32

2-1/16

2-27/32

27

2-1/2

2-29/32

2-7/16

2-29/32

2-7/16

2-31/32

2-5/16

2-61/64

2-5/16

2-31/32

2-3/16

2-31/32

30

2-5/8

3-1/32

2-9/16

3-1/32

2-9/16

3-3/32

2-7/16

3-5/64

2-7/16

3-3/32

2-5/16

3-3/32

31

2-3/4

3-5/32

2-11/16

3-5/32

2-11/16

3-7/32

2-9/16

3-13/64

2-9/16

3-7/32

2-7/16

3-7/32

32

2-7/8

3-9/32

2-13/16

3-9/32

2-13/16

3-11/32

2-11/16

3-21/64

2-11/16

3-11/32

2-9/16

3-11/32

33

3

3-13/32

2-15/16

3-13/32

2-15/16

3-15/32

2-13/16

3-29/64

2-13/16

3-15/32

2-11/16

3-15/32

34

3-1/8

3-17/32

3-1/16

3-17/32

3-1/16

3-19/32

2-15/16

3-37/64

2-15/16

3-19/32

2-13/16

3-19/32

35

3-1/4

3-21/32

3-3/16

3-21/32

3-3/16

3-23/32

3-1/16

3-45/64

3-1/16

3-23/32

2-15/16

3-23/32

36

3-3/8

3-25/32

3-5/16

3-25/32

3-5/16

3-27/32

3-3/16

3-53/64

3-3/16

3-27/32

3-1/16

3-27/32

37

3-1/2

3-29/32

3-7/16

3-29/32

3-7/16

3-31/32

3-5/16

3-61/64

3-5/16

3-31/32

3-3/16

3-31/32

40

3-5/8

4-1/32

3-9/16

4-1/32

3-9/16

4-3/32

3-7/16

4-5/64

3-7/16

4-3/32

3-5/16

4-3/32

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Within a given diameter (i.e. 1/4, 3/8, 1/2, etc.) of any AN/MS/NAS series, all bolts will have the same thread length, no matter how long the bolt. With AN series bolts, you must have a chart or bolt gauge to determine lengths, grips or part numbers. THE DASH NUMBERS DO NOT INDICATE GRIPS OR OVERALL LENGTHS. AN Bolt Guages available on this website on other pages.

With MS and NAS series bolts, the dash number is the grip in 1/16" (0.0625") increments, e.g. -18 = 18 x 0.0625" = 1.125" = 18/16". Thus, to determine the overall length of a bolt, simply add the thread length for that series and diameter to the grip length you desire, e.g. NAS 1306-24: grip is 1.50" + threads: 0.578" = 2.078" overall length.

Hex head aircraft bolts are made of high-strength 4037 or 8740 alloy steel (type 8740 is most commonly used). Bolts are centerless ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Cadmium plated per specification QQ-P-416A, Type II, Class 3. Available with shank drilled for cotter pin or undrilled for stop nut application, with or without drilled head for safety wire. Specify bolts that are undrilled shank by adding letter "A" after dash number. For bolts with drilled head add letter "H" after AN number (AN3H-10A). The length of AN aircraft bolts is measured from under the head to the end of the shank. The "grip" is the unthreaded portion of the shank. See table for conversion of length and/or grip for proper AN callout.