DIN 125 Product Class A, Up to 250 HV Hardness, Primarily For Hex Bolts and Nuts - ISO 7089 Flat Washers, Normal Series, Product Class A

In the DIN 125 standard published by the German Standardization Institute (DIN), primarily the requirements for hexagonal bolts and nuts with product class A and hardness up to 250 HV are explained and test methods are defined. This standard is designed as two parts in itself.

DIN 125 A standard covers flat washers without chamfers. For this material, the ISO 7089 standard has also been published by the International Standards Organization (ISO) (ISO 7089 Flat washers - Normal series - Product class A). This standard describes the characteristics of regular series, product class A flat washers in hardness classes 200 HV and 300 HV and nominal sizes ranging from 1,6 mm to 64 mm (nominal thread diameters).

Washers with a hardness class of 200 HV are suitable for:

• Hex bolts and screws of product classes A and В in property classes up to and including 8.8
• Hex nuts of product class A and В in property classes up to and including 8
• Hex bolts, screws and nuts in stainless steel with similar chemical composition
• Hardened tapping screws

Washers of hardness class 300 HV are suitable for:

• Hex bolts and screws of product classes A and В in property classes up to and including 10.9
• Hex nuts of product class A and В in property classes up to and including 10.

DIN 125 B standard covers beveled flat washers. The ISO 7090 standard has also been published by the International Standards Organization (ISO) for this material (ISO 7090 Flat washers, chamfered - Normal series - Product class A). This standard, on the other hand, describes the characteristics of the regular series, product class A flat washers in the hardness classes of 200 HV and 300 HV and chamfered outer diameters with nominal sizes ranging from 5 mm to 64 mm (nominal thread diameters).

Washers with a hardness class of 200 HV are suitable for:

• Bolts and screws of product classes A and В in property classes up to and including 8.8
• Nuts of product class A and В in property classes up to and including 8
• Bolts, screws and nuts of stainless steel with similar chemical composition
• Hardened tapping screws

Washers of hardness class 300 HV are suitable for:

• Bolts and screws of product class A and В in property classes up to and including 10.9
• Nuts of product class A and В in property classes up to and including 10.

Among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, our organization, with its trained and expert staff and advanced technological equipment, primarily for hexagonal bolts and nuts (product class A) up to 125 HV hardness within the scope of DIN 250 standard. Within the scope of ISO 7089 standard, it also provides testing services for flat washers, normal series (product class A) and within the scope of ISO 7090 standard, for flat washers, chamfered, normal series (product class A).