Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
12SWS2551 Richco, Inc. (Essentra Components)	SHOULDER WASHER .258 ID .753 OD	500
12SWS0364 Richco, Inc. (Essentra Components)	SHOULDER WASHER .197 ID .364 OD	1000
12SWS0296 Richco, Inc. (Essentra Components)	SHOULDER WASHER .187 ID .499 O	0
12SWS3032 Richco, Inc. (Essentra Components)	SHOULDER WASHER .324 ID .805 OD	900
10SCM008006 Richco, Inc. (Essentra Components)	SHOULDER WASHER 8.1MM ID 14.2MM	1000
12SWS1024 Richco, Inc. (Essentra Components)	SHOULDER WASHER .316 ID .620 OD	980
12SWS0870 Richco, Inc. (Essentra Components)	SHOULDER WASHER .199 ID .433 OD	1000
12SWS1222 Richco, Inc. (Essentra Components)	SHOULDER WASHER .378 ID .625 OD	1900
10SC250037 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	24700
10SC010056 Richco, Inc. (Essentra Components)	SHOULDER WASHER .200 ID .399 OD	496
12SWS0901 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	5000
12SWS3165 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	4992
12SWS1070 Richco, Inc. (Essentra Components)	SHOULDER WASHER .193 ID .500 O	0
FB1550A Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL,.385 IN	5988
12SWS1168 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	2000
12SWS0478 Richco, Inc. (Essentra Components)	SHOULDER WASHER .140 ID .325 OD	1000
10SC010014 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	23955
12SWS3029 Richco, Inc. (Essentra Components)	SHOULDER WASHER .639 ID .788 OD	1000
12SWS0257 Richco, Inc. (Essentra Components)	SHOULDER WASHER .118 ID .250 O	0
12SWS0194 Richco, Inc. (Essentra Components)	SHOULDER WASHER .118 ID .197 OD	1970

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