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Bolts, Screws and Nuts - External Wrenching UNJ Thread, Inch - Design Standard
- Aerospace Standard
Published February 24, 2016 by SAE International in United States
Downloadable datasets availableAnnotation ability available
The scope of this SAE Aerospace Standard (AS) is to define the following dimensional requirements for double hexagon, hexagon head and tee headed bolts, and nuts with AS8879 UNJ inch series threads primarily for use in propulsion systems. Design requirements are based on UNJC threads for sizes 0.1640 and smaller and UNJF threads for sizes 0.1900 and larger.
General revision, revise datums for position on bolts with drilled holes, revise datums for geometric tolerancing requirements on nuts (Figures 18A and 18B), delete radius at transition of wrench and base flange on 12 point bolts and nuts, update callouts and formats per ASME Y14.5M, clarify strength classes, add tertiary datum for safety wire hole position requirements, add part drawing templates (appendices), figures redrawn and tables reformatted, and general editorial update.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Table 1A||Head dimensions for double hexagon head bolts|
|Table 1B||Drilled head dimensions for double hexagon head bolts|
|Table 2A||Head dimensions for double hexagon head bolts (260 ksi min)|
|Table 2B||Drilled head dimensions for double hexagon head bolts (260 ksi min)|
|Table 3A||Head dimensions for hexagon head bolts|
|Table 3B||Drilled one hole - hexagon head bolts|
|Table 3C||Drilled six hole - hexagon head bolts|
|Table 4A||Head dimensions for tee head bolts with compound under head radius|
|Table 4B||Shank length (L) range for bolts with compound under head radius|
|Table 5||Shank length (L) range for bolts|
|Table 6||Shank diameter, full shank and PD shank diameter and lead thread chamfer diameter|
|Table 7||Grip length range for close tolerance shank bolts|
|Table 8||Straightness of shank and thread - TOL AD|
|Table 9||Runout tolerance for plain shank in relation to pitch diameter cylinder (all sizes)|
|Table 10||Geometric tolerances for OD, crest of double hexagon and crest of hexagon relative to plain shank|
|Table 11||Positional tolerance for drilled holes in head of hexagon and double hexagon head bolts|
|Table 12||Perpendicularity tolerance for bearing surface relative to the shank|
|Table 13||Nut configurations|
|Table 14||Nut, self-locking, spline drive|
|Table 15||Nut, hexagon, plain, drilled and undrilled|
|Table 16||Nut, hexagon, castellated|
|Table 17||Nut, hexagon, shear, drilled and undrilled|
|Table 18||Nut, self-locking, double hexagon|
|Table 19||Nut, self-locking, double hexagon, reduced height|
|Table 20||Nut, self-locking, double hexagon, counterbored|
|Table 21||Nut, self-locking, double hexagon (260 ksi min)|
|Table 22||Geometric tolerances for nuts|
E-25 General Standards for Aerospace and Propulsion Systems
The SAE E-25 General Standards for Aerospace & Propulsion Systems committee addresses aerospace propulsion systems and components. These systems and components include bolts, screws, nuts, washers, studs, rivets, pins, covers, O-rings, brackets, plugs and associated procurement requirements, as well as solid film lubricants and design specifications for screw threads and fastener assembly requirements.
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