Metric Flat 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 |
| Flatness | Shim Rings: 0.025–0.075 mm; Supporting Rings: max. 0.05 mm |
The material and surface condition of a DIN 988 ring influence its dimensional stability, contact behavior, and suitability for the intended assembly.
- Dimensional Stability
Shim rings are manufactured from material suitable for thin-section production, helping maintain a consistent thickness when used for precise axial adjustment.
- Load-Bearing Condition
Supporting rings require a more rigid material condition for contact with loaded components. Hardened steel is used where the ring needs to maintain its shape under mechanical pressure.
- Surface Protection
The surface condition can be selected according to storage, handling, and operating exposure. Oiled or treated surfaces help protect the steel during handling and service.
- Mating Surface Compatibility
The ring material and finish should be considered together with the shaft, bearing, housing, or other contacting components to avoid unsuitable material combinations or surface conditions.
Shim Rings vs. Supporting Rings
DIN 988 includes different ring configurations for different mechanical requirements. The selection should be based on whether the primary requirement is precision spacing or mechanical support.
| Feature | Shim Rings | Supporting Rings |
|---|---|---|
| Primary Function | Axial clearance adjustment | Mechanical support and load distribution |
| Typical Thickness | 0.10–2.00 mm | 1.00–3.50 mm |
| Main Application | Fine dimensional compensation | Supporting shafts, bearings, and components |
| Selection Focus | Required adjustment value | Load, support area, and assembly structure |
Metric flat washer Manufacturer
DIN 988 Production Capability
Production covers standard ring dimensions, different thickness specifications, and supporting ring configurations in accordance with DIN 988 requirements.
Precision Thickness Control
Thin shim rings require consistent thickness to achieve the specified adjustment value. Production controls focus on thickness, inner diameter, outer diameter, and flatness.
Material & Heat Treatment Capability
Steel materials can be processed according to the required material specification, with supporting rings available in hardened conditions to achieve the specified hardness range.
Specification-Based Manufacturing
Anhui Pins can manufacture according to customer drawings or defined technical specifications, including non-standard dimensions, thicknesses, materials, and surface requirements.
FAQ
How do I determine the correct inner diameter?
The inner diameter should provide sufficient clearance around the shaft or other mating component without creating excessive radial movement. The shaft diameter, assembly tolerance, and installation conditions should be considered together.
Are DIN 988 rings suitable for bearing assemblies?
They can be used in certain bearing and shaft assemblies for axial spacing or support, provided the ring dimensions, hardness, load conditions, and contact surfaces are suitable for the specific design.
Can the rings be supplied in a specific thickness not listed as a standard size?
Custom thicknesses may be possible depending on the required dimension, material, quantity, and production feasibility. A technical drawing or specified tolerance should be provided for evaluation.
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