10mm Bore 13-Tooth Chain Idler Sprocket | C45 Steel ISO 08B

10mm Bore 13-Tooth Chain Idler Sprocket – C45 Carbon Steel, 1/2" Pitch

Keep your machinery running smoothly with this precision-engineered Chain Idler Sprocket. Designed for ISO 08B roller chains with a 1/2" (12.7mm) pitch, this 13-tooth idler sprocket is built from high-grade C45 carbon steel with a high-temperature quench-hardened tooth profile — delivering exceptional hardness, wear resistance, and long service life in demanding transmission applications.

Featuring a sealed internal bearing, the sprocket rotates freely on a fixed shaft without the need for additional lubrication hardware. Its convex idler design ensures consistent chain tension, reducing slack and improving the efficiency and longevity of your drive system.

Made in Mainland China.

Key Specifications

• Number of Teeth: 13
• Outside Diameter: 58mm (2.28")
• Bore Diameter: 10mm (0.39")
• Pitch: 1/2" / 12.7mm (ISO 08B)
• Total Width: 14mm (0.55")
• Tooth Width: 7.3mm (0.29")
• Bump Width: 3.5mm (0.14")
• Material: C45 Carbon Steel
• Finish: Black (heat-treated)
• Compatible Chain Standard: ISO 08B Roller Chain

Product Highlights

• 🔩 C45 Carbon Steel Construction — High-strength material with heat-treated teeth for superior hardness and durability
• 🔄 Sealed Bearing — Allows free rotation on a fixed shaft; no additional lubrication needed
• ⚙️ Convex Idler Design — Maintains consistent chain tension for smoother, quieter operation
• 🏭 Versatile Applications — Suitable for milling machines, drilling machines, conveyor systems, and general machinery transmission
• ✅ ISO 08B Compatible — Direct fit for standard 1/2" pitch roller chains

How It Works

An idler sprocket is a flat sprocket mounted in a fixed position on a stationary shaft. Unlike drive sprockets, it does not transmit torque — instead, it guides and tensions the chain to prevent sagging or jumping. At least 3 teeth should remain in mesh with the chain at all times for optimal performance. Do not operate the idler sprocket at speeds exceeding the rated limit for drive sprockets of equivalent size.

What's in the Box

• 1 × Chain Idler Sprocket (pre-assembled with sealed bearing)

Important Notes

• Manual measurements may vary by ±2–3%. Please verify dimensions carefully before ordering.
• Slight color variation is possible due to photography lighting and display settings.
• Unit is supplied fully assembled and ready to install.

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For general guidance on mechanical power transmission standards and safe machinery operation practices, refer to OSHA's Machine Guarding resources.

Frequently Asked Questions

Q: What chain standard is this idler sprocket compatible with?

A: This sprocket is designed for ISO 08B roller chains with a standard 1/2" (12.7mm) pitch. Always verify your chain's pitch and width before purchasing to ensure a proper fit.

Q: Does the idler sprocket come with a bearing installed?

A: Yes. The sprocket includes a sealed bearing pre-installed, allowing it to spin freely on a fixed shaft. It is shipped fully assembled and ready to install.

Q: What is the minimum number of teeth that should engage the chain?

A: It is recommended that at least 3 teeth remain in mesh with the chain at all times for safe and effective operation. This ensures adequate load distribution and prevents premature wear.

Q: What applications is this sprocket suitable for?

A: This idler sprocket is widely used in milling machines, drilling machines, conveyor systems, and a variety of other industrial and mechanical transmission setups requiring ISO 08B chain compatibility.