NA 131

DIN Standards Committee Aerospace


Aerospace series - Inserts, helical coil threads, screw-locking - Part 1: Class: 1 100 MPa/235 °C/425 °C; Text in German and English


This document is applicable to screw-locking thread inserts for the manufacturing of high-strength, wear-resistant, high-duty, vibration-proof and exchangeable bolted connections in metallic and non-metallic materials and for repairing stripped or damaged threads. The thread inserts are applicable for bolts having ISO metric threads or MJ threads (see Table 1). Thread inserts with surface treatment according to code letter A are suitable for use at temperatures up to 235 °C.



Planned document number

LN 9499-1

Project number


Responsible national committee

NA 131-03-01 AA - Aerospace fasteners 

previous edition(s)

Aerospace series - Inserts, helical coil threads, screw-locking - Part 1: Class: 1100 MPa/235 °C/425 °C; Text in German and English

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