Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
12SWS0244 Richco, Inc. (Essentra Components)	SHOULDER WASHER .115 ID .234 OD	1000
12SWS0928 Richco, Inc. (Essentra Components)	SHOULDER WASHER .140 ID .500 O	0
12SWS3164 Richco, Inc. (Essentra Components)	SHOULDER WASHER .506 ID .885 OD	2000
12SWS0966 Richco, Inc. (Essentra Components)	SHOULDER WASHER .375 ID .563 O	0
12SWS2100 Richco, Inc. (Essentra Components)	SHOULDER WASHER .437 ID .688 O	0
12SWS0830 Richco, Inc. (Essentra Components)	SHOULDER WASHER .147 ID .375 O	0
12SWS1027 Richco, Inc. (Essentra Components)	SHOULDER WASHER .312 ID .500 O	0
12SWS5009 Richco, Inc. (Essentra Components)	SHOULDER WASHER .270 ID 2.111 OD	500
12SWS0820 Richco, Inc. (Essentra Components)	SHOULDER WASHER .140 ID .375 O	0
12SWS0191 Richco, Inc. (Essentra Components)	SHOULDER WASHER .140 ID .350 OD	1000
12SWS0245 Richco, Inc. (Essentra Components)	SHOULDER WASHER .115 ID .235 O	0
12SWS3104 Richco, Inc. (Essentra Components)	SHOULDER WASHER .265 ID .750 OD	991
12SWS0611 Richco, Inc. (Essentra Components)	SHOULDER WASHER .108 ID .201 O	0
12SWS0852 Richco, Inc. (Essentra Components)	SHOULDER WASHER .136 ID .375 OD	5000
12SWS0238 Richco, Inc. (Essentra Components)	SHOULDER WASHER .125 ID .230 OD	6000
MNI-HT-4-2 Richco, Inc. (Essentra Components)	WASHER SHOULDER #4 POLY SULFIDE	0
12SWS3163 Richco, Inc. (Essentra Components)	SHOULDER WASHER .476 ID .940 O	0
12SWS4002 Richco, Inc. (Essentra Components)	SHOULDER WASHER .510 ID 1.235	0
12SWS3516 Richco, Inc. (Essentra Components)	SHOULDER WASHER .311 ID .825 O	0
12SWS0260 Richco, Inc. (Essentra Components)	SHOULDER WASHER .125 ID .250 OD	1000

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