Washers - Bushing, Shoulder

Part Number	Description / PDF	Quantity
11SFW0006 Richco, Inc. (Essentra Components)	FINISHING WASHER .143 ID .437 OD	986
12SWS0234 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	8650
12SWS2508 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	4925
12SWS1048 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	24351
12SWS0223 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	9453
12SWS1216 Richco, Inc. (Essentra Components)	SHOULDER WASHER .315 ID .630 OD	998
10SCM006006 Richco, Inc. (Essentra Components)	SHOULDER WASHER 6.1MM ID 12.2MM	988
12SWS0803 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	4994
12SWS0211 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	9690
10SCM002003 Richco, Inc. (Essentra Components)	SHOULDER WASHER 2.1MM ID 4.2MM O	315
12SWS2570 Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL, NYLON	9696
12SWS1026 Richco, Inc. (Essentra Components)	SHOULDER WASHER .198 ID .588 O	0
MNI1/4-16 Richco, Inc. (Essentra Components)	WASHER SHOULDER 1/4 NYLON	4448
12SWS1154 Richco, Inc. (Essentra Components)	SHOULDER WASHER .260 ID .516 OD	1000
FBM1150A Richco, Inc. (Essentra Components)	SHOULDER WASHER, NATURAL,.709 IN	995
12SWS0408 Richco, Inc. (Essentra Components)	SHOULDER WASHER .090 ID .235 OD	1000
12SWS0605 Richco, Inc. (Essentra Components)	SHOULDER WASHER .146 ID .328 OD	6000
12SWS0918 Richco, Inc. (Essentra Components)	SHOULDER WASHER .230 ID .450 OD	1000
12SWS0957 Richco, Inc. (Essentra Components)	SHOULDER WASHER .194 ID .281 O	0
12SWS2536 Richco, Inc. (Essentra Components)	SHOULDER WASHER .375 ID .750 OD	2000

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