Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
12SWS0916 Richco, Inc. (Essentra Components)	SHOULDER WASHER .376 ID .743 OD	1000
12SWS0217 Richco, Inc. (Essentra Components)	SHOULDER WASHER .100 ID .228 OD	775
12SWS2569 Richco, Inc. (Essentra Components)	SHOULDER WASHER .307 ID .550 O	0
12SWS1193 Richco, Inc. (Essentra Components)	SHOULDER WASHER .299 ID .730 O	0
12SWS0405 Richco, Inc. (Essentra Components)	SHOULDER WASHER .111 ID .250 O	0
12SWS1173 Richco, Inc. (Essentra Components)	SHOULDER WASHER .388 ID .839 O	0
12SWS2104 Richco, Inc. (Essentra Components)	SHOULDER WASHER .310 ID .500 O	0
12SWS1164 Richco, Inc. (Essentra Components)	SHOULDER WASHER .169 ID .562 O	0
12SWS0304 Richco, Inc. (Essentra Components)	SHOULDER WASHER .118 ID .256 OD	1000
12SWS1057 Richco, Inc. (Essentra Components)	SHOULDER WASHER .260 ID .505 OD	1000
12SWS2588 Richco, Inc. (Essentra Components)	SHOULDER WASHER .378 ID .752 O	0
12SWS1041 Richco, Inc. (Essentra Components)	SHOULDER WASHER .260 ID .498 OD	1000
12SWS3155 Richco, Inc. (Essentra Components)	SHOULDER WASHER .440 ID .875 OD	5000
12SWS4023 Richco, Inc. (Essentra Components)	SHOULDER WASHER .492 ID 1.250	0
SW-031-145 Califia Lighting (Bivar)	WASHER SHOULDER #4 POLY SULFIDE	0
12SWS1145 Richco, Inc. (Essentra Components)	SHOULDER WASHER .318 ID .562 O	0
12SWS0469 Richco, Inc. (Essentra Components)	SHOULDER WASHER .160 ID .388 OD	1000
12SWS3161 Richco, Inc. (Essentra Components)	SHOULDER WASHER .569 ID .875 OD	1000
12SWS3999 Richco, Inc. (Essentra Components)	SHOULDER WASHER .480 ID 1.250 OD	965
12SWS0839 Richco, Inc. (Essentra Components)	SHOULDER WASHER .169 ID .385 O	0

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