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Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter
- Aerospace Standard
- AS8879C
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Aerospace Standard (AS) specifies the characteristics of screw threads - UNJ profile inch series, including a mandatory controlled radius as specified in Table 1 at the root of the external thread. The minor diameter of both external and internal threads provides a basic thread height of .5625H to accommodate the external thread maximum root radius. The following detailed design requirements are included:
-
a
Screw threads - UNJ basic profile and design profiles.
-
b
Standard series of diameter-pitch combinations for nominal thread diameters from 0.060 to 6.000 inches.
-
c
Standard thread classes and form tolerances.
-
d
Formulae for thread dimensions and tolerances.
-
e
Method of designating UNJ threads.
-
f
Tables for selected diameter-pitch combinations for close tolerance mechanical thread applications.
-
g
Tables for screw thread - UNJ profile thread limit dimensions.
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Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| TABLE 1 | Basic Thread Data | |
| TABLE 1 | Basic Thread Data (Continued) | |
| TABLE 2 | Coarse Thread Series | |
| TABLE 3 | Fine Thread Series | |
| TABLE 4 | Extra Fine Thread Series | |
| TABLE 5 | Eight Thread Series | |
| TABLE 6 | Twelve Thread Series | |
| TABLE 6 | Twelve Thread Series (Continued) | |
| TABLE 7 | Sixteen Thread Series | |
| TABLE 7 | Sixteen Thread Series (Continued) | |
| TABLE 8 | Dimensional Design and Conformance Requirements | |
| TABLE 8 | Dimensional Design and Conformance Requirements | |
| TABLE 9 | Special Diameter-Pitch Combinations |
Issuing Committee
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.
Reference
| Number | Title |
|---|---|
| ASMEB1.1 | This document is not part of the subscrption. |
| ASMEB1.2 | This document is not part of the subscrption. |
| ASMEB1.3 | This document is not part of the subscrption. |
| ASMEB1.7M | This document is not part of the subscrption. |
| ASMEB46.1 | This document is not part of the subscrption. |
| ASMEB47.1 | This document is not part of the subscrption. |
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