AN178-31: NAS58-31

AN178-31

What it is: AN178 close tolerance hex head bolt (AN173 THRU AN186), Hex head, close tolerance, .5000-20 UNF-3A, shank (A dia) .4991-.4986", grip 2.438" (±.016), length 3.219" (+.031 -.010 as printed) (AN173 THRU AN186 Rev. 7 sheet 3, Table II)
Equivalents: NAS58-31NASCatalog onlySame NSN 5306-00-180-0330 (government catalog). Not a maker's approval: confirm on the drawing.
Install tooling, by who made the part: Not documented for this part number. Ask a tooling specialist →

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Reference only: the drawing and its process spec govern. How to read this

Full detail: decode, cited documents, every stock number

Head: Hex head, close tolerance
Diameter: .5000-20 UNF-3A, shank (A dia) .4991-.4986"
Grip / length: grip 2.438" (±.016), length 3.219" (+.031 -.010 as printed) (AN173 THRU AN186 Rev. 7 sheet 3, Table II)
Material: Non-corrosion resistant steel (no material letter)

Install tooling, by who made the partNot documented for this part number.

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Identical or approved-alternate part numbers, each with the document that states it.

No sourced equivalent on file for AN178-31. SpecLok only lists an equivalent when a manufacturer or government document states it.