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Home / Hardware / Bolts /AN4 Bolts 1/4-28
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AN4 Bolts 1/4-28

315 Reviews 2 Answered Questions
From $0.50 to $39.60
Reference Chart

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Dash No. Nominal
Length		 Grip
Length		 AN4 Cad Plated
Drilled		 AN4 Cad Plated
Undrilled		 AN4C Stainless
Drilled		 AN4C Stainless
Undrilled
-315/321/16$1.09
Quantity
$0.50
Quantity
$13.90
Quantity
$3.70
Quantity
-417/321/8$1.44
Quantity
$0.50
Quantity
$2.04
Quantity
$5.35
Quantity
-521/323/16$1.01
Quantity
$0.75
Quantity
$1.92
Quantity
$5.80
Quantity
-625/325/16$1.50
Quantity
$0.54
Quantity
$2.90
Quantity
$2.74
Quantity
-729/327/16$1.63
Quantity
$0.58
Quantity
$2.37
Quantity
$3.45
Quantity
-101-1/329/16$1.56
Quantity
$0.66
Quantity
$6.65
Quantity
$3.50
Quantity
-111-5/3211/16$2.23
Quantity
$0.76
Quantity
$3.70
Quantity
$5.35
Quantity
-121-9/3213/16$2.09
Quantity
$0.85
Quantity
$3.50
Quantity
$4.35
Quantity
-131-13/3215/16$1.46
Quantity
$0.84
Quantity
$3.40
Quantity
$2.78
Quantity
-141-17/321-1/16$2.13
Quantity
$1.17
Quantity
$3.35
Quantity
$3.85
Quantity
-151-21/321-3/16$2.00
Quantity
$0.93
Quantity
$3.35
Quantity
$4.80
Quantity
-161-25/321-5/16$2.55
Quantity
$1.71
Quantity
--$4.35
Quantity
-171-29/321-7/16$1.73
Quantity
$1.09
Quantity
$9.50
Quantity
$3.35
Quantity
-202-1/321-9/16$2.09
Quantity
$2.45
Quantity
$6.50
Quantity
$4.75
Quantity
-212-5/321-11/16$2.73
Quantity
$1.05
Quantity
--$6.50
Quantity
-222-9/321-13/16$1.98
Quantity
$1.57
Quantity
--$2.67
Quantity
-232-13/321-15/16$2.55
Quantity
$1.52
Quantity
--$10.50
Quantity
-242-17/322-1/16$2.00
Quantity
$2.13
Quantity
--$6.80
Quantity
-252-21/322-3/16$2.78
Quantity
$1.76
Quantity
--$11.80
Quantity
-262-25/322-5/16$3.35
Quantity
$1.54
Quantity
--$4.85
Quantity
-272-29/322-7/16$2.06
Quantity
$1.46
Quantity
--$6.60
Quantity
-303-1/322-9/16$2.24
Quantity
$1.96
Quantity
--$6.60
Quantity
-313-5/322-11/16$3.50
Quantity
$1.57
Quantity
----
-323-9/322-13/16$2.17
Quantity
$3.45
Quantity
----
-333-13/322-15/16$2.47
Quantity
$2.10
Quantity
----
-343-17/323-1/16$2.57
Quantity
$1.73
Quantity
----
-353-21/323-3/16$2.36
Quantity
$1.71
Quantity
----
-363-25/323-5/16$3.75
Quantity
$2.48
Quantity
----
-373-29/323-7/16$2.61
Quantity
$2.33
Quantity
----
-404-1/323-9/16$3.35
Quantity
$5.80
Quantity
----
-414-5/323-11/16$3.35
Quantity
$2.76
Quantity
----
-424-9/323-13/16$3.40
Quantity
$4.75
Quantity
----
-434-13/323-15/16$3.80
Quantity
$4.75
Quantity
----
-444-17/324-1/16$3.35
Quantity
$4.35
Quantity
----
-454-21/324-3/16$4.40
Quantity
$12.50
Quantity
----
-464-25/324-5/16$4.60
Quantity
$4.35
Quantity
----
-474-29/324-7/16$3.75
Quantity
$3.35
Quantity
----
-505-1/324-9/16$9.60
Quantity
$9.50
Quantity
----
-515-5/324-11/16$15.50
Quantity
$17.50
Quantity
----
-525-9/324-13/16$16.70
Quantity
$11.50
Quantity
----
-535-13/324-15/16--$11.80
Quantity
----
-545-17/325-1/16--$17.50
Quantity
----
-555-21/325-3/16$17.50
Quantity
$15.80
Quantity
----
-565-25/325-5/16$17.50
Quantity
$23.50
Quantity
----
-575-29/325-7/16$17.50
Quantity
$32.85
Quantity
----
-606-1/325-9/16$17.50
Quantity
$38.50
Quantity
----
-616-5/325-11/16--$16.60
Quantity
----
-626-9/325-13/16--$20.50
Quantity
----
-646-1/26-1/16$22.50
Quantity
$38.65
Quantity
----
-666-25/326-5/16--$24.50
Quantity
----
-727-9/326-13/16--$39.60
Quantity
----
Subtotal $0.00
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Overview

Hex head aircraft bolts are made of high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly used). The 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, and with or without drilled head for safety wire. Specify bolts to have undrilled shank by adding letter "A" after the dash number. For bolts with drilled head add letter "H" after the AN number. See illustrated examples. "C" represents Type 431 Stainless Steel (contains iron which is magnetic). 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 to proper AN callout.

15% discount on qty of 50-99
20% discount on qty of 100+

Note: Drilled bolts listed above are drilled shank only. To order drilled head only or both drilled head and shank bolts, please use our AN Bolt Selector by clicking the link below.

Click here for the AN Bolt Selector

Reference Chart

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Reviews

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First class quality bolt for use on a sports racing car, at a very good price.

William F Verified Purchase

Bolt Undrilled AN4-26A
October 23, 2025

Chris D Verified Purchase

Bolt Undrilled AN4-26A
October 22, 2025

the very best bolt I have ever bought

Greg M Verified Purchase

Bolt Undrilled AN4-7A
September 17, 2025

the very best bolt I have ever bought

Greg M Verified Purchase

Bolt Undrilled AN4-10A
September 17, 2025

Martinho C Verified Purchase

Bolt Undrilled AN4-6A
September 2, 2025

Kenneth L Verified Purchase

Bolt Undrilled AN4-14A
September 2, 2025

Kenneth L Verified Purchase

Bolt Undrilled AN4-13A
September 2, 2025

Just what I wanted and ordered excellent service

Barry F Verified Purchase

Bolt Undrilled AN4-15A
August 10, 2025

Kenneth L Verified Purchase

Bolt Undrilled AN4-27A
July 28, 2025

Kenneth L Verified Purchase

Bolt Undrilled AN4-26A
July 28, 2025

Q&A

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Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What are the quantities for price breaks and the standard package quantities? I know you'll send any quantity, but I'd order above the price breaks and in multiples of the package quantities if they were listed.

The discount schedule for large quantities are: 50-100 = 15% / 100+ = 20%. Package quantities are usually 25 but we can sort them however you prefer as long as you mention it in special instructions at checkout.

Q: How do I order AN4 bolts with the head drilled on line?

Use the AN Bolt Selector page. Keyword search "AN Bolt Selector" on our website and click the first result, then use the drop down selections on the page to choose the bolts you need.

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