Designed for High-Strength Fasteners
300HV hardness prevents washer deformation and maintains clamp load in Grade 10.9 bolted assemblies.
DIN 125 2B
Washers with a hardness from 300HV,Type B
- Standard: DIN 125 2B
- Material: Stainless Steel
- Size: 5-160
- Surface Treatment: Plain, Zinc Plated
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 125-2B Hardened Flat Washers are high-strength chamfered flat washers (Form B) manufactured with a minimum hardness of 300 HV, specifically designed for high-strength bolted joints. Compared with standard 140HV or 200HV washers, DIN 125-2B provides significantly higher bearing strength, preventing washer deformation under heavy preload while ensuring reliable load distribution and joint stability.
Form B washers feature a single-sided chamfer, making them especially suitable for use beneath hexagon bolt heads and nuts with fillet radii, allowing proper seating and reducing localized stress concentration. DIN 125-2B has largely been replaced by ISO 7090 (300HV) while maintaining the same functional purpose and dimensions.
Draw
Specification
DIN 125-2B vs DIN 125-2A
DIN 125-2B
- One-side chamfer
- Better fit for bolt head radius
- Preferred for heavy-duty assemblies
- Improved stress distribution
DIN 125-2A
- Flat on both sides
- General industrial applications
- Easier manufacturing
- Suitable where chamfer is unnecessary
DIN 125-2B vs ISO 7090
Although DIN 125-2B is still widely specified worldwide, ISO 7090 is its modern international equivalent.
DIN 125-2B
- Traditional DIN standard
- Form B chamfer
- Widely used in Europe and Asia
ISO 7090
- International replacement
- Same functional dimensions
- Available in 200HV and 300HV hardness classes
- Preferred for new international projects
Product Advantages
Chamfered Form B Geometry
The precision chamfer seats correctly against bolt-head fillets, minimizing edge stress and improving load distribution.
Built for Demanding Industrial Service
Ideal for heavy machinery, structural steel, mining, wind energy, and other high-load, vibration-prone applications.
Common Questions
What is DIN 125-2B?
DIN 125-2B is a hardened Form B flat washer with a chamfered edge and a minimum hardness of 300HV for high-strength bolted joints.
What is the difference between DIN 125-2 Form A and Form B washers?
Form A has flat faces without chamfers, while Form B includes a chamfer that accommodates the radius under bolt heads and nuts, improving seating performance.
Which bolt grades are suitable?
Yes. ISO 7090 is the current international replacement standard for DIN 125 Form B washers with equivalent dimensions and hardness classes.
Can you provide OEM manufacturing?
Yes. We offer customized dimensions, hardness requirements, coatings, laser marking, packaging, and private-label solutions.
