BOLT-MACHINE, DOUBLE HEXAGON, EXTENDED WASHER HEAD, PD SHANK, STEEL (SAE 8740), BLACK OXIDE, .2500-28 UNF-3A AS9158A

DOI: https://doi.org/10.4271/AS9158A

Issuing Committee: E-25 General Standards for Aerospace and Propulsion Systems

Publisher: SAE International

Pages: 3

Rationale: FIGURE 1 RE-DRAWN, REVISE THREADS TO ASME B1.1, REVISE LIGHTENING HOLE DEFINITION TO ALLOW OPTIONAL SHAPE AT BOTTOM, ADD AS478 CLASS A MARKING, ADD MINIMUM BEARING FACE REQUIREMENT, ADD SURFACE TEXTURE REQUIREMENT TO HEAD, ADD REVISED DATUM FOR SHORT BOLT LENGTHS, UPDATE MPI REFERENCE, UPDATE SURFACE TEXTURE REFERENCES, EXTENSIVE EDITORIAL REVISIONS AND RE-FORMATTING.