ISO-5855-1 Aerospace -- MJ threads -- Part 1: General requirements

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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. For all diameters 1,6 mm to 300 mm, it offers in the form of tables the basic dimensions and tolerances for a selection of diameter and pitch combinations. It also provides the method of calculation for the dimensions and tolerances for any diameter and pitch combination not given in the tables, including threads with a diameter in excess of 300 mm.

For limit dimensions for bolts and nuts of nominal diameter 1,6 mm to 39 mm, see ISO 5855-2. For limit dimensions for fittings for fluid systems, see ISO 5855-3.




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49.030.10 (Screw threads Screw threads for general use, see 21.040)

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Document Number

ISO 5855-1:1999

Revision Level




Publication Date

Oct. 15, 1999

Committee Number

ISO TC 20/SC 4/WG 7