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AN4 Bolts -- Undrilled Head Product Group

AN4 Bolts -- Undrilled Head

AN4 bolts have a 1/4-28 UNF thread with 0.469 inch thread length (except AN4-3A, which has 0.406 inch thread length).

A or no A? AN bolts were originally designed to be used with a castle nut and cotter pin, so the base part number indicates a drilled shank. The addition of an "A" at the end (for example, AN4-13A) indicates an undrilled head and an undrilled shank for use with a self-locking nut.

AN bolt nomenclature can be confusing. Please take a look at our page on Identifying AN Bolt Sizes.

Image
Part No.
Description
Price
Status
Click this thumbnail image of AN4  Airframe Bolt, 1/4-28 Thread for product details

AN4-Size 

AN4 Airframe Bolt, 1/4-28 Thread

Click to check price Some
In Stock
Click this thumbnail image of Pocket AN Bolt Identification Gauge for product details

3319 

Pocket AN Bolt Identification Gauge

$12.99 In Stock
Click this thumbnail image of (HAO) Torque Seal Inspector's Lacquer, Orange, 1/2 oz. Tube for product details

3329 

(HAO) Torque Seal Inspector's Lacquer, Orange, 1/2 oz. Tube

$2.29 In Stock

 

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