High Tensile Hex Bolts/Screws
Metric Series - Dimensions
Note: 
  1. The bolts and screws will generally confirm to IS:1364

  2. Threads will generally confirm to class 6G of IS:4218

  3. Material High grade carbon / alloy steel

  4. Heat Treatment : Property class 8.8 or 10.9

  5. Thread Length : Bolts shall be half threaded.
                              Screws shall be fully threaded.

  6. All dimensions are in millimeters.

Specifications Diameter Range Length Range Property Grade
IS 1364 M 16 - M 64 30 mm - 450 mm IS 1367 Gr. 8.8 / 10.9
 
High Tensile Hex Head Nuts 
Note:
  1. The nuts will generally confirm to IS:1364

  2. Threads will generally confirm to class 6H of IS:4218

  3. Material            : High grade carbon/alloy steel

  4. Heat Treatment : As per property class 8 or 10.

  5. In Bolt/Nut assembly, tightening should be done by rotation of nut.

  6. All dimensions are in millimeters.

Specifications Diameter Range Grade
IS 1364 M 16 - M 64 IS 1367 Gr. 8 / 10
 

It is obvious from the following chart that high tensile bolt of property class 8.8 is approximately four times stronger than an ordinary mild steel bolt of property class 4.6. This extra strength of high tensile bolts can be used to upgrade an assembled joint from a low tensile one to high tensile one to gain all the advantage described.

 
Advantage : 
 
  • Reduced number of bolts.

  • Reduced bolt size.

  • Less numbers of holes.

  • Reduced size of holes.

  • Reduced assembly cost.

  • Reduced maintenance cost.

Strength Grade Tensile Grade Yield Grade Yield Index
(4.6=100)
4.6 400 Mpa 240 Mpa 100
8.8 800 Mpa 640 Mpa 266
10.9 1000 Mpa 900 Mpa 375