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Product Details
Model NO.:
Rexnord Coupling Hub
Torque:
62-6500
Bore Diameter:
10-165
Speed:
1000-5400
Structure:
Flexible
Material:
Stainless Steel
Type:
Coupling Hub
Pump Package:
Carton And Wooden Cases
Testing:
Dynamic Balancing
Types Of Welding Parts:
OEM/ODM
Material Standard:
ASTM, ANSI, SAE, Uns, DIN, En, ISO, Toct
Material 1:
Cast Iron, Wear-Resistant Cast Iron, Cast Steel
Material 2:
Stainless Steel, Duplex Ss, Cast Alloy Steel
Certificate:
ISO9001:2015, ISO14001:2004, API Specification Q1
Mould:
Investment Casting Mould, Sand Casting Mould
Transport Package:
Carton And Wooden Cases
Specification:
According To The Drawings
Origin:
China
HS Code:
84139100
Production Capacity:
10, 000 Tons Per Year
Highlight:
Customized Rexnord Omega Coupling
,Stainless Steel Coupling Hub
,Rexnord Omega Coupling with warranty
Payment & Shipping Terms
Minimum Order Quantity
1
Price
35
Product Description
REXNORD Coupling Hub – Bore Types, Hub Mounting & How to Order
About Dongguan HydroBlue Co., Ltd.
DONGGUAN HydroBlue CO.,LTD. is a professional engineering enterprise providing comprehensive technical solutions in fluid machinery, fluid engineering, industrial automation, and frequency conversion systems. Our team of 8 technical professionals in fluid engineering, electrical engineering, and electronic engineering combines deep technical expertise with flexible manufacturing capabilities. Partnerships with Jiangsu University, Chinese Academy of Sciences, and Guangdong University of Technology underpin our capabilities in hydraulic R&D, specialty coating applications, and intelligent industrial drive technologies. Jiangsu University National Research Center of Pumps provides coupling hub stress distribution analysis and keyway root stress concentration modeling for REXNORD hub performance in pump drives; Chinese Academy of Sciences contributes advanced corrosion-resistant coating technology for hub surface protection in aggressive environments; Guangdong University of Technology supports automated bore gauge calibration and CMM-based hub dimensional verification for consistent manufacturing quality.
Inquire with your pump model and coupling hub specifications — our engineering team will assess compatibility and provide a detailed technical response.
OUR BRANDS & SERVICES
Our brand provides professional overall technical solutions in fluid machinery and engineering. We specialize in industrial control and drive equipment, mechanical seals, and overseas field engineering solutions. Our ecosystem of specialized technologies and product brands empowers our clients with high-caliber technical guidance, commercial support, and integrated product solutions — including pumps, frequency converters, servo drives, PLC-HMI, industrial control cabinets, motors, mechanical seals and systems, couplings, gearboxes, and engineering solutions (overseas on-site 3D scanning reverse molding of pump replacement parts to your satisfaction, and on-site equipment debugging services by overseas dispatched engineers).
Bore Types & Shaft Connection Methods
|
Connection Type |
Bore Style |
Torque Transmission |
Mounting Effort |
Typical Application |
|---|---|---|---|---|
|
Straight bore + keyway |
Parallel bore with keyseat |
Key carries full torque |
Slide-on, tighten set screw; moderate |
Standard industrial, most common pump drive |
|
Taper bore + split bushing |
Tapered bore (8° or 2° per side) |
Bushing friction + key |
Slide bushing on shaft, seat hub, tighten bolts; easy |
Quick installation/removal, frequent maintenance |
|
Splined bore |
Involute or straight spline |
Spline teeth carry torque |
Slide-on; requires accurate spline alignment |
Heavy-duty, high-torque, where keyway is insufficient |
|
Interference fit (shrink) |
Bore undersize by 0.02–0.05 mm |
Press-fit friction without key |
Heat hub to 150–250°C, slide on; difficult |
High-speed, no-backlash, precision drives |
Hub Mounting & Installation Guide
- Shaft Inspection — Measure shaft diameter and check for burrs, corrosion, or surface damage; shaft material should be compatible with the hub bore fit
- Bore Fit Check — For straight bore hubs, verify the shaft OD is within H7 tolerance of the hub bore; a too-tight fit will seize, a too-loose fit will fret and wallow the bore
- Key Fit Check — Test-fit the key in the shaft keyseat and hub keyway separately; the key must slide in with light hand pressure -- no hammer fit
- Hub Mounting — For straight bore: apply light oil to shaft, slide hub to position, tighten set screws to manufacturer torque. For taper bushing: slide bushing onto shaft, position hub, torque bushing bolts evenly in sequence
- Axial Positioning — Position the hub so the flex element (spider, grid, disc pack, or gear sleeve) will align axially with the mating hub on the opposite shaft
- Set Screw Torque — Tighten set screws over the key to the specified torque; over-tightening distorts the keyway, under-tightening allows hub movement on the shaft
- Post-Mount Check — After mounting, check hub face runout against the shaft; runout ≤ 0.05 mm TIR is acceptable for most pump applications
Hub Dimension Reference
|
Coupling Size |
Max Bore (mm) |
Hub OD (mm) |
Hub Length (mm) |
Keyway Width (mm) |
|---|---|---|---|---|
|
Small (jaw/light duty) |
30 |
50–65 |
35–45 |
8–10 |
|
Medium (grid/disc) |
55 |
90–120 |
55–75 |
12–16 |
|
Large (grid/gear) |
100 |
150–200 |
80–110 |
20–28 |
|
Heavy (gear/API) |
180 |
230–330 |
120–180 |
32–45 |
How to Order
- REXNORD Coupling Model & Hub Type — Grid hub, jaw hub, disc hub, or gear hub; reference the existing coupling size if replacing
- Shaft Diameter — Pump shaft diameter and motor shaft diameter in mm or inches; specify tolerance grade if other than H7
- Keyway Dimensions — Keyway width, depth, and standard (DIN metric or ANSI inch); confirm if the hub is for the pump shaft or motor shaft side
- Bore Type — Straight bore + keyway, taper bore + QD/Taper-Lock bushing, or splined bore
- Hub Material — Forged steel (standard), alloy steel 4140, SS 304, SS 316, or ductile iron
- Balance Grade — Mill-balanced (standard), G6.3, or G2.5 dynamic balance
- Quantity — Individual hubs or pairs (matched set for one coupling assembly)
- Delivery — 10–20 days after deposit; standard bore and keyway sizes in stock, custom boring adds 3–5 days
Payment: 70% T/T deposit, balance against copy of B/L.
FAQ
Q1: Can I replace a hub without removing the shaft or pump from service permanently?
A: Yes. Hubs can be replaced without removing the pump or motor from the baseplate. For straight bore hubs, loosen the set screws and pull the hub axially off the shaft using a hub puller. For taper bushing hubs, remove the bushing bolts and tap the bushing loose using the ejection slots. Replace with the new hub, re-check alignment, and the pump is back in service.
Q2: What causes hub bore fretting wear and how can it be prevented?
A: Hub bore fretting is caused by micro-movement between the hub bore and shaft surface under cyclic torque. The primary causes are insufficient interference fit (bore too loose), missing or loose set screws, or a worn key that allows radial hub movement. Prevention: ensure the bore-to-shaft fit is within H7 tolerance, torque set screws to the manufacturer's specification, and replace worn keys during hub replacement.
Q3: Can hubs with different bore sizes on the pump and motor sides be paired in the same coupling assembly?
A: Yes, as long as the hub engagement features (grid slot size, spider leg spacing, disc bolt pattern, or gear tooth form) are the same coupling series and size. The pump-side hub bore and motor-side hub bore can be different diameters. When ordering, specify which hub is for which shaft and the respective bore/keyway dimensions for each.
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Room 1904, Building 1, Zhongtang Tianan Digital City, No.89 Jinyuan Road, Zhongtang Town,Dongguan City, Guangdong Province, China.
