Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
B-533-V2750 Aearo Technologies, LLC – a 3M company	BUSHING 3/4" THERMOPLASTIC	0
B-532-3 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	0
B-533-V2325 Aearo Technologies, LLC – a 3M company	BUSHING 3/4" THERMOPLASTIC	0
B-434-V2590 Aearo Technologies, LLC – a 3M company	BUSHING 1/2" THERMOPLASTIC	683
B-533-3 Aearo Technologies, LLC – a 3M company	BUSHING 3/4" THERMOPLASTIC	3631
B-434-V2575 Aearo Technologies, LLC – a 3M company	BUSHING 1/2" THERMOPLASTIC	0
B-532-V2325 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	0
B-434-V2325 Aearo Technologies, LLC – a 3M company	BUSHING 1/2" THERMOPLASTIC	1446
B-531-2 Aearo Technologies, LLC – a 3M company	BUSHING 0.36" THERMOPLASTIC	3950
B-531-V2325 Aearo Technologies, LLC – a 3M company	BUSHING 0.36" THERMOPLASTIC	0
B-532-V2525 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	0
B-533-2 Aearo Technologies, LLC – a 3M company	BUSHING 3/4" THERMOPLASTIC	3269
B-531-1 Aearo Technologies, LLC – a 3M company	BUSHING 0.36" THERMOPLASTIC	34370
B-532-V2590 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	500
B-532-1 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	0
B-434-V2375 Aearo Technologies, LLC – a 3M company	BUSHING 1/2" THERMOPLASTIC	0
B-532-2 Aearo Technologies, LLC – a 3M company	BUSHING 0.42" THERMOPLASTIC	394

Washers - Bushing, Shoulder

1. Overview

Washers - Bushing, Shoulder are precision mechanical components combining the functions of a bushing and a washer. Featuring a stepped outer diameter design, they provide axial load distribution while maintaining precise radial alignment. These components are critical in modern machinery for reducing friction, preventing vibration-induced loosening, and protecting assembly surfaces. Their engineered geometry enables simultaneous load-bearing and spacing functionality in compact designs.

2. Major Types & Functional Classification

Type	Functional Characteristics	Application Examples
Standard Shoulder Bushing Washer	Uniform wall thickness, concentric shoulder design	General-purpose machinery, automotive linkages
Threaded Shoulder Bushing	Integrated internal threading for secure fastening	Aerospace fastening systems, vibration equipment
Split Shoulder Bushing	Segmented design for easy installation/removal	Heavy equipment maintenance, shaft repair
Flanged Shoulder Washer	Extended flange for enhanced load distribution	Structural steel connections, rail systems

3. Structural Composition

Typical construction features:

Tapered or stepped outer diameter (15 -30 transition angle)
Controlled inside diameter tolerance ( 0.025mm to 0.1mm)
Material composition: Carbon steel (SAE 1045), Stainless Steel (AISI 304/316), Bronze (SAE 841), or Polymer (Nylon 6/66)
Surface treatments: Zinc plating (8-24 m), Black Oxide, DLC coating, or PTFE impregnation
Hardness range: 200-400 HV depending on application requirements

4. Key Technical Parameters

Parameter	Significance
ID/OD Dimensional Tolerance	Ensures proper fit with shaft and housing (typically H7/g6)
Shoulder Height	Determines axial positioning accuracy ( 0.1mm standard)
Hardness Rating	Affects wear resistance and load capacity
Surface Roughness (Ra)	Impacts friction coefficient (Ra 0.8-3.2 m typical)
Corrosion Resistance	Determines service life in harsh environments

5. Application Fields

Primary industries:

Automotive: Suspension systems, transmission linkages
Aerospace: Flight control actuation systems, engine mounts
Industrial Machinery: CNC machine tool spindles, robotic joints
Railway: Bogie pivot joints, coupler systems
Renewable Energy: Wind turbine pitch bearings, solar tracker mechanisms

6. Leading Manufacturers & Products

Manufacturer	Key Product Series	Technical Features
MISUMI	WSB Series	Modular design, 12 standard sizes
Nord-Lock Group	Shox Washer	Combined wedge-locking and bushing function
Bossard Group	Proliant SW	High-strength steel (12.9 class)
IKEUCHI	Oiles SPB	Self-lubricating polymer composite

7. Selection Guidelines

Key selection criteria:

Load Requirements: Calculate radial/axial loads using ISO 76:2006 standards
Environmental Factors: Consider operating temperature (-50 C to +300 C range)
Material Compatibility: Prevent galvanic corrosion between mating components
Installation Clearance: Allow 0.5-1.5mm radial play for thermal expansion
Case Study: In wind turbine pitch bearings, stainless steel shoulder washers with solid lubricant pockets demonstrated 40% longer service life versus conventional designs

8. Industry Trends

Emerging development directions:

Material innovation: Graphene-reinforced polymers for weight reduction
Smart integration: Embedded strain sensors for condition monitoring
Manufacturing advancement: Additive manufacturing for complex geometries
Sustainability focus: Bio-based coatings replacing hexavalent chromium
Standardization efforts: ISO/TC 2/SC 12 developing global design standards