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Home / Product Range / Taper Bushes / Taper Lock Bushes (Imperial Series) / P-Type Extra-Large-Bore American Standard QD Taper Bush, for Giant Mining and Marine Heavy Industry
  • P-Type Extra-Large-Bore American Standard QD Taper Bush, for Giant Mining and Marine Heavy Industry
  • P-Type Extra-Large-Bore American Standard QD Taper Bush, for Giant Mining and Marine Heavy Industry
Taper Lock Bushes (Imperial Series)

P-Type Extra-Large-Bore American Standard QD Taper Bush, for Giant Mining and Marine Heavy Industry

The P-type American-standard QD taper bush is a "brute-force class" transmission connector built for the world's top heavy industry, giant mining machinery, and energy equipment. Its torque capacity of up to 250,000 lb-in and extra-large bore design completely solve the critical pain points of heavy shaft systems loosening and rolling keys under extreme operating conditions.

Item Specification
Model P (American standard QD taper bush, Quick-Disconnect Bushing)
Material ASTM65-45-12 (QT450-10 ductile iron) / heavy-duty gray cast iron
Taper angle 4° external taper (core feature of QD type)
Bore type Mainly large imperial bores (metric optional)
Standard bore range 2.938 in ~ 5.938 in (approx. 74.6 mm ~ 150.8 mm)
Torque capacity 250,000 in-lb (approx. 28,248 N·m)
Keyway type Heavy-duty wide keyway / shallow keyway / keyless
Surface treatment Anti-rust primer / black oxide
Matching fasteners Heavy-duty American standard UNC/UNF bolt set (multiple bolts in an array)
Installation method Multi-point flange-face bolt locking, with heavy-duty jacking holes for quick removal




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Key Product Advantages Key Selling Points Applications and Scenarios Contact Us

1. Ultimate torque, pushing the limits of heavy industry: As the flagship of the QD series, the P type can withstand extreme torque of up to 250,000 in-lb. In giant jaw crushers or large marine propulsion systems, it locks the drive shaft with absolute rigidity and prevents any minute relative slip.
2. Ductile iron material, unfazed by extreme shocks: The body is made of high-strength ductile iron (QT450-10), combining outstanding rigidity and toughness. Compared with ordinary gray cast iron, ductile iron effectively absorbs the fearsome shock wave at heavy-load start-up and prevents the flange from cracking.
3. Heavy-duty array locking, high concentricity: A ring of high-strength heavy-duty fastening bolts is arranged on the flange face. When tightened evenly, the 4° taper generates tremendous radial clamping force that bites down on drive shafts up to 150mm thick, providing unmatched centering accuracy.
4. Solving the removal problem of large equipment: Traditional heavy shaft systems often need hydraulic jacks or flame cutting to disassemble. The P-type bush has multiple jacking holes built in; during maintenance, simply thread bolts into the jacking holes with a heavy-duty wrench to push the bush smoothly off the hub, greatly shortening downtime on large equipment.

The "anchor" of heavy machinery: Built for high-power transmission above the hundred-kilowatt level and a perfect substitute for the original connection parts of top imported heavy equipment.
Minimal maintenance, goodbye to heavy pullers: The jacking-hole design makes installing and removing drive parts on a 150mm shaft as simple and safe as turning a screw.
Globally interchangeable, solving discontinuation crises: Strictly benchmarked to North American heavy-duty standards and able to directly replace large QD bushes from brands such as Browning and Dodge.

Large mining equipment: Giant jaw crushers, large ball mills, and main drives of ten-million-ton-class belt conveyors.
Energy and power: Large thermal power generating units, wind turbine main shafts, and hydro turbine drives.
Marine and ports: Ship propulsion shafting, large port cranes, and bucket-wheel reclaimer drives.
Metallurgy and heavy industry: Large steel rolling mills, 10,000-ton hydraulic presses, and main-shaft connections of cement rotary kilns.

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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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