Idler Sprocket, #40 Chain 18T 1/2"Bore

Idler Sprocket, #40 Chain 18T 1/2"Bore

The 25401808 Idler Sprocket is a roller chain idler sprocket built for #40 chain applications, providing smooth chain guidance and dependable engagement where a free-spinning idler is needed. With an 18-tooth design and a 1/2" bore, it’s a practical replacement or service part for agricultural and industrial chain-driven equipment.

Country of Origin
Varies by production batch

Key Features / Specifications

• Model / Part Number: 25401808
• Product Type: Idler Sprocket
• Chain Size Compatibility: #40 chain
• Tooth Count: 18T
• Bore Size: 1/2 in
• Overall Length: 0.68 in (17 mm)
• Outside Diameter: 3.14 in (80 mm)
• Width: 0.22 in (6 mm)
• Item Weight: 0.44 lb (0 kg listed)
• Shipping Dimensions: 0.68 in L × 3.14 in H × 0.22 in W (2 cm L × 8 cm H × 1 cm W)
• Shipping Volume: 0.47 in³ (8 cm³)
• Shipping Weight: 0.44 lb (0 kg listed)

Ideal For

• Replacing worn idlers on equipment using #40 roller chain
• Chain drive setups that need an 18-tooth idler sprocket for guidance or tensioning
• Agricultural and industrial machinery requiring a 1/2" bore idler sprocket
• Maintenance repairs to restore smooth chain tracking and engagement
• Shops stocking common idler sprocket sizes for quick turnaround service