DIN 988 Shim Rings — A2 Stainless Steel (SUS304), Whitened & Passivated

FULLERKREG DIN 988 shim rings are precision-stamped from A2 stainless steel (SUS304) with a whitened and passivated surface. Used for precise axial adjustment of bearings, shafts, and mechanical assemblies — setting bearing preload, eliminating axial play, and achieving precise dimensional tolerances. Multiple standard thicknesses (0.1–3.0 mm) can be stacked to achieve any required dimension.

Product Specifications

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Dimensions — DIN 988 Full Range

d = inner Ø (H11) | D = outer Ø (h11) | s = available thicknesses (mm)

Contact FULLERKREG for non-standard sizes or sizes above Ø200 mm.

Typical Applications

• ⚙️ Bearing preload & axial adjustment — angular contact, tapered roller, and thrust bearings in gearboxes and spindles
• 🔧 Shaft spacing & gear positioning — precise axial positioning of gears, pulleys, and sprockets
• 🏭 Gearbox & transmission assembly — automotive and industrial gearboxes, differentials
• 🤖 CNC & precision machinery — spindle bearing preload in machining centres and grinding machines
• 🍼 Food & pharmaceutical machinery — A2 stainless for hygienic, corrosion-resistant environments
• 🚗 Automotive & motorsport — differential preload, gearbox shaft positioning
• 🛠️ Tooling & fixtures — precise height adjustment in machining fixtures and jigs

FAQ

Q: What is a DIN 988 shim ring?
A: A precision thin flat ring for axial adjustment, manufactured to tight thickness tolerances (±0.010–0.015 mm). Unlike DIN 125A flat washers, shim rings set precise axial clearances and bearing preloads. Multiple shims can be stacked to achieve any required dimension.

Q: How do I select the correct thickness?
A: Measure the axial gap with a dial gauge. Required shim = measured gap − target clearance. Combine standard thicknesses (0.1, 0.2, 0.3, 0.5, 1.0, 2.0, 3.0 mm) to achieve the exact value. Verify each shim with a calibrated micrometer before assembly.

Q: Can I stack multiple shims?
A: Yes. Total stack = sum of individual shims. Ensure all shims are clean, flat, and burr-free.

Q: Why choose A2 stainless?
A: A2 (SUS304) resists corrosion in machinery, food processing, and mildly corrosive environments where carbon steel shims would rust and contaminate the assembly.