DIN 988 Hardened Steel Washer Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 988 |
| Product Types | Shim Rings / Supporting Rings |
| Inner Diameter (d1) | 3–170 mm |
| Outer Diameter (d2) | 6–200 mm |
| Shim Ring Thickness (s) | 0.10–2.00 mm |
| Supporting Ring Thickness (h) | 1.00–3.50 mm |
| Shim Ring Material | DC01-C490, EN 10139 |
| Supporting Ring Material | Hardened Steel, EN 10132 |
| Supporting Ring Hardness | 440–500 HV |
| Surface | Oiled / Phosphated / According to requirement |
Material selection is matched to the function of the ring. DIN 988 shim rings use DC01-C490 material according to EN 10139, providing controlled sheet thickness for axial adjustment. Supporting rings are manufactured from hardened steel according to EN 10132, with a specified hardness range of 440–500 HV.
- DC01-C490 for Shim Rings
The material is suited to thin-section rings where dimensional thickness and flatness are important for controlled axial spacing. Shim thicknesses from 0.10 to 2.00 mm allow adjustment in small increments.
- Hardened Steel for Supporting Rings
Supporting rings use a higher-hardness steel structure for applications requiring a more resistant contact surface. The 440–500 HV hardness range helps limit permanent deformation at the supporting interface during mechanical assembly.
- Material Control
Material grade, thickness, and hardness can be verified against the specified order requirements. For custom production, alternative material grades or hardness requirements can be evaluated according to the application and drawing.
Shim Ring & Supporting Ring Construction
DIN 988 rings are manufactured with a circular flat-ring geometry defined by the inside diameter (d1), outside diameter (d2), and thickness. These dimensions determine how the ring fits around a shaft or between mating components and how much axial space is controlled during assembly.
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Quality Control for Hardened Steel Washers
Quality control focuses on the dimensions and material properties that directly affect washer installation and mechanical positioning. Inspection requirements can be established according to DIN 988 or the dimensional tolerances specified on the customer's drawing.
Material Verification
Incoming steel materials are verified before production to ensure the specified material grade meets the required standards. Material composition and batch information can be checked to maintain traceability throughout the manufacturing process.
Dimensional Inspection
Critical dimensions including inner diameter (d1), outer diameter (d2), thickness, and flatness are inspected according to DIN 988 requirements or customer drawings. Precision measuring instruments and optical inspection equipment are used to verify dimensional consistency.
Hardness & Surface Inspection
Supporting rings are tested for hardness according to the specified requirement, including the 440–500 HV range for hardened steel configurations. Surface inspection is performed to check burrs, scratches, deformation, and surface treatment conditions.
Final Inspection & Batch Control
Finished Hardened Steel Washers undergo final verification before shipment. Inspection records, production batches, and quantity checks are maintained to ensure consistent delivery for repeat orders and bulk production.
Custom Hardened Steel Washer Manufacturing
Dimensional Customization
Custom inside diameter, outside diameter, and thickness can be produced according to approved drawings. Tight dimensional tolerances can be reviewed according to the functional requirements of the assembly.
Material & Hardness Requirements
Customers can specify the required steel grade, hardness range, and heat-treatment condition. Supporting-ring hardness can be controlled according to the application instead of being limited to the standard configuration.
Surface Treatment
Available surface requirements can include natural oil, phosphating, or other specified finishes, depending on the material and application.
Drawing-Based Production
Technical drawings can define dimensions, tolerances, hardness, surface treatment, inspection requirements, and packaging specifications. Production can be arranged for samples, repeat orders, and bulk quantities according to the customer's requirements.
FAQ
What is the main purpose of these washers in mechanical assemblies?
These washers are mainly used for spacing, alignment, and axial clearance adjustment between mechanical components. They help maintain the required position of parts where precise assembly dimensions are important.
How should I choose between a shim ring and a supporting ring?
Shim rings are typically selected when fine thickness adjustment is required, while supporting rings are used when a thicker support surface is needed. The selection depends on the assembly structure, available space, and required adjustment range.
Can you produce washers based on our technical drawings?
Yes. Custom production can be arranged according to customer drawings or specifications. Dimensions, tolerances, material requirements, surface conditions, and inspection requirements can be reviewed before production.
What information should be provided when requesting a quotation?
For an accurate quotation, customers can provide the required dimensions, material specifications, quantity, drawings if available, application details, and any special requirements for surface treatment or inspection.
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