TUR/102
WTO/TBT
TR Türkei
  • 49 - Luftfahrttechnik, Raumfahrttechnik
2017-10-09
2017-08-11
Bolt and washer sets – regular screw threaded and non-falling conical spring washer sets. Bolts, screws, studs (ICS 49.030.20)

Communiqué on TS 1031 ''Bolt and Washer Sets – Regular Screw Threaded and Non-Falling Conical Spring Washer Sets'' (Communiqué No: MSG - MS - 2017/) (4 page(s), in English)

(1) This standard covers M2.5 to M12 regular screw threaded of which strength class is 8.8 to 10.9 (10.9 included) and bolt/screw with flat seating face and non-falling(fixed) conical, spring, washer-containing screw and washer assembly tolls in description, classification and specifications, sampling, inspection and testing, and based on market supply.

(2) As a result of installation process of spring washers (given within the scope of TS 79-5), it is intended to eliminate relaxation effect in bolted connections. These cannot prevent actively loose connection under varying radial load and therefore usually designed for the purpose of using with short screw exposed to axial pressure.

(3) Star screwdriver twisted screws, critical cross-sectional body not to be in threaded part but be in the beginning screws, is not suitable for bolt and washer sets. For restrictions in use of these bolts it should be viewed to the related product standard.

(4) NOT 1 Standardized bolt/screw and washer combinations and related symbols are given in TS EN ISO 10644. NOT 2 In this standard, from now on instead ''regular threaded and non-falling conical spring washer assembly tools'' expression purely ''non-falling washer bolt'' term is used.