A bolt-load retention (BLR) test is a practical test to determine the bolt load of a fastener joint with time and at given temperatures. There are three types of BLR tests described in this standard, namely general-purpose test, design-purpose test, and screening material test. A general-purpose BLR test may be used for screening materials, while a design-purpose BLR test is usually used to verify the BLR behavior of a specific joint. The screening material test is an example of the general-purpose test for typical automotive applications.

This standard provides a test method for determining the torque-tension relationship of a fastener finish as applied to a surrogate screw for the purpose of measuring the frictional characteristic of the fastener finish. The results obtained by this test shall be used as a process control attribute of the fastener finish and shall not be utilized for specific applications.

Applications include specifications, reports, ratings, texts etc., where fluid leakage rates are treated.

To establish recommended hole sizes for use with protruding head metric threaded fasteners primarily used on propulsion equipment, and provide the recommended positional tolerance for use with these holes.

This document provides a recommended practice for installation of interference fit studs into threaded holes in non-ferrous alloys such as aluminum or magnesium.

The purpose of this MAP is to establish stud hole clearance diameters to accept standard Metric studs. This is based entirely on recommendations set forth by the International Organization for Standardization (ISO).

ISO Recommendations R273, Clearance Holes for Metric Bolts (Fine series) and R286, ISO System of Limits and Fits (H14 series) were used to establish the size and tolerance for each stud hole in the MAP.