S-5909K978 0.312" ID x 0.75" OD Washers for Needle-Roller Thrust Bearings

Key Features & Benefits at a Glance

• Precision dimensional control ensures reliable fit and alignment for 5/16" shafts, minimizing assembly issues and vibration.
• Robust steel construction provides excellent load distribution and resistance to deformation under high-stress industrial conditions.
• Tight tolerance ranges (ID: 0.002" to 0.012", OD: -0.03" to -0.01") guarantee consistent performance and interchangeability in automated or manual assembly.
• RoHS 3 and REACH compliance ensures environmental safety and material sustainability, meeting strict international regulatory standards.
• 0.0625" thickness with controlled tolerance offers optimal spacing and secure fastening without adding excessive bulk to the assembly.
• Standard inch sizing (0.312" ID, 0.75" OD) ensures broad compatibility with common North American machinery and components.
• Durable material properties enhance service life and reduce maintenance frequency in demanding mechanical applications.

Professional Applications & Engineering Value

This precision steel washer is engineered to address critical challenges in industrial machinery and mechanical assemblies. Its exact 0.312" inner diameter and controlled ID tolerance (0.002" to 0.012") ensure a secure fit on 5/16" shafts, preventing misalignment and reducing wear on rotating components. The 0.75" outer diameter with negative OD tolerance provides reliable bearing surface area, distributing load effectively to protect softer materials and prevent fastener embedding. Manufactured from high-grade steel, this washer maintains integrity under repetitive stress and vibration, making it ideal for heavy-duty applications such as automotive systems, conveyor equipment, and agricultural machinery. The combination of tight thickness control and RoHS & REACH compliant materials ensures not only mechanical reliability but also adherence to global environmental and safety standards, supporting sustainable manufacturing practices.

Specification Summary & Compliance

This steel washer conforms to inch system specifications: Inner Diameter 0.312" (tolerance 0.002" to 0.012"), Outer Diameter 0.75" (tolerance -0.03" to -0.01"), and Thickness 0.0625" (tolerance -0.0025" to 0.0005"). It is designed for use with 5/16" shaft diameters. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets the latest environmental and health safety requirements for industrial components.