SAE AS 8879D Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter

	Purchase Information Use this form to request purchase information on SAE online subscriptions. SAE Collections First Name: Last Name: Email address:

Document SAE AS 8879D is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.

You may also purchase this document alone from the IHS Standards Store.

SAE AS 8879D Document Information:

Title
Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter

SAE International

Publication Date:
Aug 1, 2004

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.

Purpose:

This document specifies the geometric design for each characteristic of screw threads - UNJ profile inch series and the conformance requirements. In addition, the purpose of this standard is to:

a. Define the geometric requirements for a selected series of Unified Screw Threads, modified to provide a radius at the external thread root.

b. Establish requirements for a continuous radius at the root of the external threads.

c. Establish requirements for an increase in the minor diameter of both internal and external threads to accommodate the external thread root radius.

About IHS
IHS (NYSE: IHS) is a leading global provider of critical technical information, decision-support tools and related services in a number of industries including aerospace and defense, automotive, construction, electronics, and energy. IHS serves customers ranging from large governments and multinational corporations to smaller companies and technical professionals in more than 100 countries. IHS been in business for more than 45 years and employ more than 2,300 people around the world.