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AN102906

Aeronautical Standard Bolt

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Description

Fastener Length: 1/2", Hole Diameter: 1/16", Thread: 1/4-28, Thread Length: 31/64"

Specifications

Fastener Length 0.490 inches minimum and 0.510 inches maximum
Features Provided Finished head
Hardness Rating 26.0 rockwell c minimum and 32.0 rockwell c maximum
Head Height 0.178 inches minimum and 0.198 inches maximum
Head Style Hexagon Head
Hole Configuration Style Hexagon flats
Hole Diameter 0.070
Hole Quantity 1
Hole Type Drilled
Length 1/2
Material Steel
Material Specification Ams 6322 assn std single material response
Surface Finish 32.0 microinches threads, 63.0 microinches bearing surface of head, 63.0 microinches grip
Surface Treatment Cadmium
Surface Treatment Specification Ams 2400 assn std single treatment response
Thread Class 3a
Thread Diameter 0.250
Thread Direction Right-hand
Thread Length 0.419 inches minimum and 0.490 inches maximum
Thread Qty 28
Thread Qty Per Inch (tpi) 28
Thread Series Designator UNF
Thread Size 1/4
Width Between Flats 0.430 inches minimum and 0.439 inches maximum

Cross-reference

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Catalog data updated 2026-07-05. Report a data error