The MJ screw thread is intended for aerospace metric threaded parts and for other highly stressed applications requiring high temperature or high fatigue strength, or for “no allowance” applications. The MJ profile thread is a hard metric version similar to the UNJ inch standards, ANSI/ASME B1.15 and MIL-S-8879. The MJ profile thread has a ...

MJ thread is a special form of thread that is used in the aerospace market for applications that require high stress or high temperture. it gives the designer a "no allowance" thread.

2003年4月25日 · Thread profile MJ designates the external thread has an increased root radius (shallower root relative to external M thread profile), thereby having higher fatigue strength (due to reduced stress concentrations), but requires the truncated crest height of the MJ internal thread to prevent interference at the external MJ thread root (just as the ...

ISO 5855 consists of the following parts, under the general title Aerospace — MJ threads : Part 1: General requirements Part 2: Limit dimensions for bolts and nuts

This part of ISO 5855 specifies the general requirements for MJ threads used in aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for designating the diameter and

ISO 5855 consists of the following parts, under the general title Aerospace — MJ threads: This part of ISO 5855 specifies the general requirements for MJ threads used in aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for designating the diameter and pitch combinations.

This Standard establishes the basic triangular profile for the MJ thread form; provides a system of designations; lists the standard series of diameter/pitch combinations for diameters from 1.6 to 200 mm; and specifies limiting dimensions and tolerances.

Aerospace Series - Bolts, Large Bihexagonal Head, Close Tolerance Normal Shank, Medium Length Thread, in Heat Resisting Nickel Base Alloy, Passivated - Classfication: 1550 MPa (at Ambient Temperature)/315℃

This standard specifies the characteristics of the MJ profile metric series of screw threads, altered from ISO 68 M Profile, to include a mandatory controlled radius of 0.18042P to 0.15011P at the root of the external thread and with the minor diameter of both external and internal threads increased to provide a basic thread height of 0.5625H ...

A bolt with metric thread and J profile, of nominal diameter 6 mm, and pitch 1 mm, and tolerance class 4h6h would be designated MJ 6 X 1 - 4h6h. A nut with metric thread and J profile, of nominal diameter 6 mm, and pitch 1 mm, and tolerance class 4H5H would be designated MJ 6 x 1 …