Precision Fasteners & Custom CNC Components
Dowel Pins, Keys, Retaining Rings, Screws
STW Retaining Rings (S-Type Circlips for Shaft)
STW retaining rings, also known as S-type circlips, are widely used for securing components on shafts. Depending on regional standards and industrial requirements, they are commonly classified into two main specifications: JIS (Japanese Standard) and DIN (European Standard).
The following comparison outlines key differences in design dimensions, material compatibility, and typical applications, helping you select the most suitable standard for your needs.
Japanese Standard – JIS B 2804
Applicable Shaft Diameter: ø5 – ø300
Material Options:
• S50C (Medium Carbon Steel)
• SUS304 / SUS420 (Stainless Steel)
Key Features:
• Widely used across Asia
• Readily available stock for standard sizes
• Suitable for general shaft retaining applications
German Standard – DIN 471
Applicable Shaft Diameter: ø5 – ø300
Material Options:
• S50C (Medium Carbon Steel)
• SUS304 / SUS420 (Stainless Steel)
Key Features:
• Designed for heavy-duty shaft applications
• Preferred choice for European machinery
• High retention strength and dimensional precision
American Standard – 5100 Series
Applicable Shaft Diameter: 0.125" – 10"
Material Options:
• S50C (Medium Carbon Steel)
• SUS420 (Stainless Steel)
Key Features:
• Designed specifically for American machinery
• Inch-based sizing system
• Ideal for OEM replacements and maintenance parts
Application Guidance
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Automation Equipment
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Agricultural Machinery / Drive Shafts
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Mold Assembly
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Precision Machinery
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Medical Devices
Customization & Notes
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Small quantity orders, product code matching, and non-standard sizes available upon request
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Note: Dimensions between DIN 471 and JIS B 2804 differ slightly. Please verify your equipment standard before placing an order.
S-Type Circlip Installation Tool｜External Circlip Pliers for Shaft Use
Designed for use with S-type external retaining rings (STW series), this tool is an external circlip plier that expands the circlip outward after insertion into the holes, allowing for easy fitting into the shaft groove.
You can choose between two styles based on your working space and usage preference:
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Straight-Type: Suitable for open space and direct vertical operations
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Bent-Type: Ideal for limited hand space or when side-angle force is required
This circlip plier is a recommended tool by Sheng Fong, fully compatible with all STW series standards. It significantly improves installation efficiency and stability.