Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
WS0670A Richco, Inc. (Essentra Components)	WASHER SHOULDER M4 NYLON	329
12SWS0624 Richco, Inc. (Essentra Components)	SHOULDER WASHER .176 ID .312 OD	990
MNIM3-3.5 Richco, Inc. (Essentra Components)	WASHER SHOULDER M3 NYLON	457
FB1480A Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL,.375 IN	1939
12SWS0450 Richco, Inc. (Essentra Components)	SHOULDER WASHER .144 ID .312 OD	996
12SWS0420 Richco, Inc. (Essentra Components)	SHOULDER WASHER .120 ID .312 OD	765
10SC010037 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	29803
12SWS0453 Richco, Inc. (Essentra Components)	SHOULDER WASHER .140 ID .312 OD	1000
12SWS0100 Richco, Inc. (Essentra Components)	SHOULDER WASHER .038 ID .096 OD	935
12SWS0416 Richco, Inc. (Essentra Components)	SHOULDER WASHER .126 ID .250 OD	1000
12SWS1005 Richco, Inc. (Essentra Components)	SHOULDER WASHER .255 ID .464 OD	4000
12SWS0888 Richco, Inc. (Essentra Components)	SHOULDER WASHER .156 ID .400 OD	1000
12SWS0864 Richco, Inc. (Essentra Components)	SHOULDER WASHER .230 ID .395 O	0
12SWS0847 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	6863
12SWS0410 Richco, Inc. (Essentra Components)	SHOULDER WASHER .100 ID .250 OD	950
12SWS0865 Richco, Inc. (Essentra Components)	SHOULDER WASHER .196 ID .380 OD	1000
12SWS0400 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	4865
12SWS0853 Richco, Inc. (Essentra Components)	SHOULDER WASHER .190 ID .380 O	0
12SWS1010 Richco, Inc. (Essentra Components)	SHOULDER WASHER .250 ID .625 O	0
10SCM003007 Richco, Inc. (Essentra Components)	SHOULDER WASHER 3.1MM ID 6.2MM O	400

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