NF EN 20898-2 : 1994

Cooperating organizations
National foreword
Foreword
1. Scope and field of application
2. References
3. Designation system
4. Materials
5. Mechanical properties
6. Proof load values
7. Failure loads for nuts with nominal height of 0,5 D
8. Test methods
9. Marking
Annex
Loadability of bolted connections
Tables
1. Designation system for nuts with nominal heights
     >/= 0,8 D
2. Designation system and proof stresses for nuts with
     nominal heights >/= 0,5 D < 0,8 D
3. Limits of chemical composition
4. Mechanical properties (coarse thread)
5. Proof load values - Coarse thread
6. Minimum bolt stress when stripping occurs
7. Marking symbols for nuts with property classes
     according to 3.1
8. Marking for nuts with property classes according to
     3.2
9. Property classes for bolts and screws
10. Heights of hexagon nuts
11. Nut designs and property classes
12. Mechanical properties (coarse thread)
13. Influence of the thread tolerance upon the test load
Figures
1. Axial tensile test
2. Axial compressive test
3. Examples of marking with designation symbol
4. Examples of marking with code symbol (clock-face
     system)
5. Left-hand thread marking
6. Alternative left-hand thread marking
National annex NA (informative)
National annex NB (informative)

Specifies the mechanical properties of nuts within the plus 300 Degrees C to minus 50 Degrees C with nominal diameters up to and including 39 mm of triangular ISO thread and made of low alloy steel and carbon steel. Does not apply to nuts requiring weldability, locking abilities, corrosion resistance. Coverage includes proof load values, materials, marking, and mechanical properties. Also gives detailed tables and diagrams.