Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
12SWS0256 Richco, Inc. (Essentra Components)	SHOULDER WASHER .125 ID .243 OD	1000
12SWS0924 Richco, Inc. (Essentra Components)	SHOULDER WASHER .130 ID .375 O	0
12SWS0930 Richco, Inc. (Essentra Components)	SHOULDER WASHER .325 ID .468 OD	895
12SWS0951 Richco, Inc. (Essentra Components)	SHOULDER WASHER .171 ID .500 OD	3000
12SWS0617 Richco, Inc. (Essentra Components)	SHOULDER WASHER .114 ID .750 O	0
12SWS0796 Richco, Inc. (Essentra Components)	SHOULDER WASHER .144 ID .313 O	0
12SWS3015 Richco, Inc. (Essentra Components)	SHOULDER WASHER .320 ID .752 OD	1000
24SW0008B Richco, Inc. (Essentra Components)	SHOULDER WASHER, #8 SCREW, .174	5000
12SWS1068 Richco, Inc. (Essentra Components)	SHOULDER WASHER .171 ID .375 O	0
12SWS3598 Richco, Inc. (Essentra Components)	SHOULDER WASHER .630 ID 1.000	0
12SWS0851 Richco, Inc. (Essentra Components)	SHOULDER WASHER .145 ID .370 O	0
12SWS2102 Richco, Inc. (Essentra Components)	SHOULDER WASHER .310 ID .620 OD	1000
12SWS3028 Richco, Inc. (Essentra Components)	SHOULDER WASHER .563 ID 1.188	0
12SWS0971 Richco, Inc. (Essentra Components)	SHOULDER WASHER .166 ID .500 O	0
12SWS0280 Richco, Inc. (Essentra Components)	SHOULDER WASHER .112 ID .280 O	0
12SWS0968 Richco, Inc. (Essentra Components)	SHOULDER WASHER .316 ID .698 OD	1000
12SWS3510 Richco, Inc. (Essentra Components)	SHOULDER WASHER .306 ID .825 O	0
12SWS4005 Richco, Inc. (Essentra Components)	SHOULDER WASHER .538 ID 1.252 OD	4230
12SWS2495 Richco, Inc. (Essentra Components)	SHOULDER WASHER .139 ID .375 O	0
12SWS3685 Richco, Inc. (Essentra Components)	SHOULDER WASHER .612 ID 1.064	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