DIN 2391 including two parts:
Part 1 is DIN 2391-1, Seamless precision steel tubes - Dimensions.
Part 2 is DIN 2391-2, Seamless precision steel tubes - Technical delivery conditions
DIN 2391 is included in DIN Handbook 3 and 272. Gives dimensions for seamless precision steel tubes; these tube dimensions have been selected from the range of manufacturable tube dimensions which are mainly used as design elements. The tube dimensions follow ISO/DIS 3304.
References as such:
BS 7416 - Specification for Precision finished seamless cold-drawn low carbon steel tubes for use in hydraulic fluid power systems
BS 7388 - Guide for Prevention of leaks from hydraulic fluid power systems
The main products of steel / steel grade: DIN2391-1(ST35, ST45, ST52).
for Atuo use
for machinery use such as Sany, XGCM etc excavator.
Oil cylinder tube;
Motorcycle shock reducer steel tubes
Auto shock reducer inner cylinder