Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
12SWS0437 Richco, Inc. (Essentra Components)	SHOULDER WASHER .126 ID .265 OD	964
12SWS0250 Richco, Inc. (Essentra Components)	SHOULDER WASHER .142 ID .265 O	0
12SWS0917 Richco, Inc. (Essentra Components)	SHOULDER WASHER .308 ID .428 O	0
12SWS2521 Richco, Inc. (Essentra Components)	SHOULDER WASHER .270 ID .720 O	0
10SCM003009 Richco, Inc. (Essentra Components)	SHOULDER WASHER 3.1MM ID 6.2MM	0
12SWS3008 Richco, Inc. (Essentra Components)	SHOULDER WASHER .320 ID .745 OD	2000
12SWS0446 Richco, Inc. (Essentra Components)	SHOULDER WASHER .097 ID .312 O	0
12SWS0202 Richco, Inc. (Essentra Components)	SHOULDER WASHER .093 ID .205 OD	950
SW-031-177 Califia Lighting (Bivar)	WASHER SHOULDER #6 POLY SULFIDE	0
12SWS0391 Richco, Inc. (Essentra Components)	SHOULDER WASHER .110 ID .279 O	0
12SWS0193 Richco, Inc. (Essentra Components)	SHOULDER WASHER .093 ID .250 O	0
12SWS0449 Richco, Inc. (Essentra Components)	SHOULDER WASHER .124 ID .313 O	0
12SWS3006 Richco, Inc. (Essentra Components)	SHOULDER WASHER .375 ID .750 O	0
12SWS0893 Richco, Inc. (Essentra Components)	SHOULDER WASHER .170 ID .595 O	0
12SWS3105 Richco, Inc. (Essentra Components)	SHOULDER WASHER .310 ID .825 OD	500
12SWS1202 Richco, Inc. (Essentra Components)	SHOULDER WASHER .374 ID .644 O	0
12SWS3035 Richco, Inc. (Essentra Components)	SHOULDER WASHER .375 ID .625 O	0
12SWS1021 Richco, Inc. (Essentra Components)	SHOULDER WASHER .171 ID .630 O	0
12SWS1060 Richco, Inc. (Essentra Components)	SHOULDER WASHER .265 ID .492 O	0
12SWS3038 Richco, Inc. (Essentra Components)	SHOULDER WASHER .375 ID 1.000 OD	880

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