DIN6921 HEXAGON HEAD FLANGE BOLT GRADE 4.8 8.8 10.9 12.9

Bolt Standards:

• DIN6921 - Hexagon flange bolts

Strength Grades:

• 4.8: Minimum tensile strength of 400 N/mm²

• 8.8: Minimum tensile strength of 800 N/mm²

• 10.9: Minimum tensile strength of 1000 N/mm²

• 12.9: Minimum tensile strength of 1200 N/mm²

Material and Properties:

• Carbon steel

• Plain carbon steel (e.g. C10, C15, C22)

• Alloy steel (e.g. 34CrMo4, 40CrMnMoS8-6)

• Provides good strength and hardness

• Stainless steel

• Austenitic (e.g. A2, A4) - Excellent corrosion resistance

• Martensitic (e.g. 1.4006, 1.4021) - Good corrosion resistance and strength

Applications:

• General purpose (Carbon steel 4.8, 8.8)

• High-strength applications (Alloy steel 8.8, 10.9, 12.9)

• Corrosive environments (Stainless steel A2, A4, 1.4006, 1.4021)

• Flange connections where a clamping surface is required

Coatings and Finishes:

• Plain (uncoated)

• Zinc plated (for mild corrosion resistance)

• Hot-dip galvanized (for better corrosion resistance)

• Stainless steel bolts may have a passivation or polishing finish

 Dimensions: