This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter
- Aerospace Standard
- AS8879D
- Reaffirmed
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.
Rationale
AS8879D has been reaffirmed to comply with the SAE five-year review policy.
Recommended Content
| Aerospace Standard | PORT OR FITTING END, INTERNAL STRAIGHT THREAD, DESIGN STANDARD |
| Aerospace Material Specification | Plating, Cadmium (Electrodeposited) |
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 | |
| 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 7 | Sixteen Thread Series | |
| 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. |
| ASMEB1.7 | 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. |
| FED-STD-H28/20 | This document is not part of the subscrption. |
| FED-STD-H28/6 | This document is not part of the subscrption. |
* Redlines comparisons are available for those standards
listed in the Revision History that contain a radio button. A
redline comparison of the current version against a revision is
accomplished by selecting the radio button next to the standard and
then selecting 'compare'. At this time, Redline versions only exist
for some AMS standards. SAE will continue to add redline versioning
with ongoing updates to SAE MOBILUS.