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Home / Product Range / Taper Bushes / Taper Lock Bushes (Imperial Series) / JA-Type American Standard QD Taper Bush, for Small-to-Medium Fans and Agricultural Machinery Transmission
  • JA-Type American Standard QD Taper Bush, for Small-to-Medium Fans and Agricultural Machinery Transmission
  • JA-Type American Standard QD Taper Bush, for Small-to-Medium Fans and Agricultural Machinery Transmission
Taper Lock Bushes (Imperial Series)

JA-Type American Standard QD Taper Bush, for Small-to-Medium Fans and Agricultural Machinery Transmission

The American QD taper bush is a mainstream quick-release connecting component in European and American industrial transmission systems. It is secured by flange bolt locking and 4° taper expansion. It belongs to the same taper-bush family as the European-standard TB taper bush (8°), but differs clearly in locking structure and removal method.

Item Specification
Model JA (full series includes JA/SH/SDS/SD/SK/SF/E/F/J/M/N/P)
Material 45# steel / ASTM65-45-12 (QT450-10 ductile iron)
Taper angle 4° external taper (core feature of QD type)
Bore type Metric or imperial available
Bore coverage 0.500 in ~ 5.938 in (12.7mm ~ 150.8mm, depending on the specific model)
Torque capacity 1,000 in-lb (JA) ~ 250,000 in-lb (P)
Keyway type Standard keyway / shallow keyway / keyless
Surface treatment Black oxide / black phosphating
Matching fasteners American standard UNC inch-size bolts
Installation method Flange-face bolt locking, with jacking holes for quick removal
Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. 4° taper strong clamping, high centering accuracy: Multiple bolts on the flange face lock evenly, producing very high radial clamping force and high centering accuracy, suitable for medium-to-high speed and high torque conditions.
2. Dedicated jacking holes, quick removal without hammering: The flange face has jacking holes; for removal, simply thread bolts in and the bush pushes out smoothly. No heating, hammering, or puller is needed, greatly shortening equipment downtime for maintenance.
3. Standardized design, strong global interchangeability: Follows American standard general specifications, and the same size can replace QD bushes from mainstream brands such as Browning and Dodge, so overseas customers face no barrier when purchasing spare parts.
4. Replace the bush, not the pulley, lowering repair cost: Wear concentrates on the bush bore and keyway while the wheel body stays intact. Replacing just the low-cost bush of the same size restores accuracy, avoiding scrapping the entire pulley or sprocket.
5. Complete torque ladder, clear selection boundaries: From JA (1,000 in-lb) to P (250,000 in-lb), a single series covers every scenario from small fans to mining crushers.

Ultra-fast maintenance: The jacking-hole design turns removal into "just turning bolts," which is extremely friendly to overseas end users doing their own maintenance.
Flexible materials and bores: Supports metric/imperial bores and standard/shallow keyways; one pulley body can fit multiple shaft sizes by changing the bush, greatly reducing inventory.
Complete export support: Can be supplied as a set with our American-standard QD-bore pulleys and sprockets; laser LOGO engraving, custom labels, and solid-wood crate export packing are supported.

Industrial manufacturing: Sprocket and pulley connections in conveyor systems, material handling equipment, fans, and water pumps.
Heavy-duty mining and construction: Large sizes (E to P types) are used in crushers, vibrating screens, and large conveying equipment, with high torque and anti-loosening performance.
Agriculture and automotive: Connections of rotating parts on agricultural implements, and power transmission components in automotive repair and manufacturing.
Light manufacturing: Lubrication-free maintenance scenarios in clean conditions such as textile, packaging, and food machinery.

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About Rentai
Transmission Equipment

Shanghai Rentai Transmission Equipment Co., Ltd. is a manufacturer specializing in R&D, production and export of mechanical transmission components. Our main products include taper lock pulleys, taper lock bushes, timing pulleys, V-belts and timing belts. We also provide OEM & ODM custom service for non-standard transmission parts. Our factory covers over 8000 square meters, with more than 100 employees including 22 technical staff. We integrate casting, machining and finishing, equipped with CNC machines and testing instruments, with an annual casting output of 2000 tons. Supported by complete quality management system and international standards, our products are exported to Southeast Asia, Middle East, Europe and America, delivering reliable transmission solutions for global industrial clients.

  • 10+

    Industry Experience

  • 100+

    Production staff

  • 2000+Ton

    Annual Production

  • 8000+㎡

    Factory Area

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