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Rexnord Industries, LLC
Thomas® Coupling Catalog

Thomas® Coupling Catalog

Product catalog summary

The Thomas Advantage
M.T. Thomas revolutionized the coupling industry with the invention of the flexible disc coupling in 1919. The Rex® Thomas® disc coupling is known for its quality, reliability, and easy maintenance, manufactured under an ISO 9001 quality system. Tpack™ technology enhances torque density and simplifies maintenance, compatible with existing Thomas disc couplings.

Application Guide
This section provides a detailed guide on the application of various coupling types, including Series 54RDG and Series 71, suited for specific applications such as mixers, compressors, pumps, and industrial drives. It includes torque range, RPM range, maximum bore, and angular misalignment per disc pack.

Misalignment
Flexible couplings connect two shafts, transmit torque, and accommodate slight misalignments. Proper shaft alignment during installation and regular checks are crucial to prevent damage to bearings and seals. Misalignments can be angular, parallel, or axial, and flexible couplings help mitigate these issues.

Selection Procedures
The document outlines procedures for selecting disc couplings, emphasizing the importance of choosing the correct size and type for the application. Proper installation and alignment are key to ensuring good service life.

Ordering Instructions and Information
Includes detailed instructions for ordering, specifications for tapered bores, bore specifications, and information on taper lock and Q.D. bushings. Alignment instructions and locknut tightening torques are also provided.

Coupling Types
The document categorizes couplings into various types such as close-coupled, spacer, cast iron, floating shaft, single flexing disc, high performance, miniature, and special flexible disc couplings. Each category is detailed with specific series and their applications.

Disc Coupling Benefits
Benefits include no lubrication, visual inspection, no backlash, low restoring forces, and a wide temperature range. The Rex® Thomas® couplings offer high reliability, a broad range of styles and sizes, extensive engineering support, and global support.

Coupling Selection Process:
1. Determine HP/100RPM: Calculate using the formula HP/100 RPM = Horsepower x 100 / RPM.
2. Determine Service Factor: Select from the Service Factor Table, adjusting for reciprocating prime movers by adding 0.5 for 8+ cylinders, 1.0 for 6 cylinders, and 1.5 for 4 cylinders. Consult Rexnord for less than 4 cylinders.
3. Select the Coupling: Choose the smallest coupling that can transmit the calculated HP/100 RPM at the proper Service Factor.
4. Check Limiting Conditions: Ensure maximum speed, bore, and other dimensions are within limits, and that maximum torque does not exceed the coupling’s Peak Overload Torque Rating.
5. Ordering Information: Refer to pages 10-11 for details.

Service Factors:
Service Factors adjust equipment ratings for variable loading conditions. They range from 1.0 for continuous service with slight load variations to 3.0 for heavy shock loading or light reversing drives. Consult Rexnord for specific applications.

Coupling Balance:
Thomas couplings are designed with high balance quality. Balance requirements depend on system dynamics, including bearing support stiffness and shaft overhang. AGMA Standard 9000-C90 provides guidelines for coupling balance quality. Some coupling types are unsuitable for dynamic balancing.

Typical Service Factors:
Service factors for various equipment types are provided, such as 1.0 for pure liquid agitators and 3.0 for crushers. Adjustments are needed for reciprocating prime movers.

Selection Example:
A 250 HP motor driving a dredge pump at 1,800 RPM requires a coupling with a service factor of 2.0. The Series 52, Size 225 coupling meets the torque and bore size requirements.

Ordering Instructions:
Provide a drawing of the hub or shaft with complete bore and keyway details, specifying dimensions such as large diameter and taper length.

Specifications:
The document outlines specifications for tapered bores and keyways, including the necessary clearance space for drawing hubs on tapered shafts, typically 1/8" or 1/4" depending on shaft size and taper. Keyway dimensions such as width and depth are specified, with a note on whether the keyway is parallel to the taper or the shaft center line.

Supplemental Taper Bore Information:
Additional dimensions "V" and "X" are required when connected equipment is in a fixed position. A fixed "X" dimension may necessitate special coupling hubs.

Procedures:
Bore tolerances are provided for various nominal bore diameters, with specific tolerances listed for different size ranges. The document also lists the necessary information for ordering, such as quantity, coupling size and type, bore sizes, keyway and setscrew sizes, and dynamic balancing requirements.

Ordering Information:
Couplings are bored according to AGMA Standard 9002-A86. The document recommends an interference fit whenever possible and provides a cross-reference for tapered bushing and bore sizes.

General Alignment Instructions:
Proper installation and alignment are crucial for long service life. Two alignment methods are recommended: the Reverse Indicator Method and the Face/Rim Method. Detailed instructions for each method are provided.

Locknut Tightening Torques:
The document provides a table of approximate locknut tightening torque values for disc couplings, with adjustments for stainless steel hardware.

Application Data Form:
A form is included for engineers to fill out with specific application data, such as driver and driven equipment, service conditions, and customer requirements.

Dimensional Data:
Detailed dimensional data for bore, keyway, and shaft are provided, with a sketch area for additional specifications.

Close-Coupled Series 54RDG:
Engineering data for this series includes maximum horsepower, RPM, torque, weight, and service factor.

Overview: The document provides detailed technical specifications and engineering data for REX® THOMAS® flexible disc couplings, specifically focusing on types BMR, SN-GA, SN, SF, SV, and ST. These couplings are designed for heavy-duty applications and are suitable for environments with moisture, dust, or corrosive conditions.

Type BMR Couplings: Recommended for heavy-duty motor and engine-driven services such as paper machines and marine propulsion. They feature a solid intermediate shaft, cast alloy iron hubs, and Tomaloy Tpack disc packs. Misalignment tolerance is 1/3° per disc pack. The document includes a table of general dimensions and engineering data, highlighting maximum horsepower, torque, and weight for various sizes.

Type SN-GA Couplings: Designed to replace gear couplings in pulp and paper applications. They are easy to install and come with axial shims for minor adjustments. The document provides engineering data, including maximum horsepower, torque, and axial capacity.

Floating Shaft Couplings (Types SN, SF, SV): These are used to connect units that are far apart, suitable for environments with moisture or corrosive conditions. The document discusses the construction, applications, and balancing requirements for these couplings. It includes a speed/span table for operational recommendations.

Type ST Couplings: Designed for applications requiring support for substantial radial loads while accommodating angular misalignment. They are used in installations where one shaft is fully supported, and the other is single-bearing supported. The document provides dimensions and construction details.

Materials and Coatings: The couplings are available in various materials, including stainless steel, Monel, and Inconel, with coatings like black oxide, zinc, and cadmium. Special materials are available upon request for highly corrosive environments.

General Notes: Dimensions are subject to change, and certified dimensions are available upon request. The document emphasizes consulting Rexnord Industries for specific applications, especially those involving high speeds or special balancing requirements.

Overview: The document provides detailed technical specifications and descriptions of various coupling products manufactured by Rexnord Industries, Inc. It includes information on the design, materials, and applications of these couplings, as well as guidelines for their use and installation.

Specifications: The document outlines the compliance of the couplings with API 671 standards, emphasizing features such as piloted fit between hubs and spacers, compact and lightweight design, and ease of use. It includes detailed engineering data, such as maximum speed, continuous torque, peak overload torque, weight, and torsional stiffness for different coupling sizes.

Design and Materials: The couplings are designed with unitized flexing elements and are part of the High Performance Series 63. Materials used include aluminum alloy for hubs and center members, brass for rivets and washers, and stainless steel for discs. Some couplings are available with electronically insulated phenolic material.

Product Variants: The document describes various styles of miniature couplings, such as Style CC, CA, CB, and CBC, each designed for specific shaft configurations and space limitations. It also mentions special flexible disc couplings for unique applications.

Applications and Recommendations: The couplings are suitable for industrial applications like pumps, compressors, blowers, mixers, and more. The document advises consulting Rexnord for specific application requirements and larger sizes.

Additional Products: Rexnord offers a range of coupling solutions, including Rex Viva, Omega Elastomer, Thomas Disc, and Addax Couplings, each designed for easy maintenance and specific industrial applications.

Customer Service: Rexnord provides worldwide customer service with contact information for various regions, emphasizing their commitment to quality and customer satisfaction.

Catalog excerpts

TABLE OF CONTENTS DESCRIPTION Couplings PAGE The Thomas Advantage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4, 5 Misalignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Selection Procedures . . . . . . . . . . . . ....

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Couplings THE REX® THOMAS® ADVANTAGE M.T. Thomas revolutionized the coupling industry by inventing the flexible disc coupling in 1919. Today Thomas’ engineers continue to improve the disc coupling through design innovation, modern materials and lean manufacturing processes. The Rex® Thomas® disc coupling is manufactured within a certified ISO 9001 quality system and is unsurpassed in its reputation for quality, reliability and easy maintenance features. The flexible disc packs are engineered for infinite life when applied within the published ratings and environmental guidelines. Our experience...

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Couplings REX® THOMAS® COUPLING APPLICATION GUIDE Typical Applications Close-coupled applications. Suitable as replacement for gear and grid couplings Torque Range* (lb.-in.) RPM* Range Up Coupling Type Up to to 1,724,800 to 43,400 to 3,390,000 1/3 4.75 16 1/2° 14 17 1/3° 10.8 18, 19 1/2° – 1/3° 4.75 20 1/2° 15.5 21 1/3° 15.5 22, 23 1/3° 6 24 1/3° N/A 25 15,000 Up 15 Up to 9.00 9,000 Up Max. Ang. Misalignment Per Disc Pack Up to Page Number 10,500 Up Max.* Bore (in.) Up ° Series 54RDG Mixers, Compressors, Agitators, Blowers and Fans, Centrifugal Pumps, Conveyors DBZ-B Pumps & Compressors (Centrifugal,...

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Couplings REX® THOMAS® COUPLING APPLICATION GUIDE Vertical Drives such as Sewage Pumps, Printing Machines, Marine Pumps. Available as a standard in corrosionresistant materials Up to to 1,466,000 3,600 Up Up to to 1,466,000 3,600 Up Up to to 200,000 2,500 Up Up to to 1,040,000 2,500 Up Up to to 838,800 7,100 Up to to 28,500 Up to to 1,150,000 SF Turbines, Pumps, Compressors, Test Stands, Generators, Speed Increasers, Fans (Cooling Tower, Mine Ventilating, Forced and Induced Draft), Paper Mill Drives, Line Shafts, Printing Machines, Pumps. Available as a standard in corrosion-resistant materials...

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Couplings REX® THOMAS® FLEXIBLE COUPLINGS A flexible coupling is a device used to connect the ends of two shafts, transmit torque, and at the same time, accommodate slight misalignments which develop in service. The primary functions of all flexible couplings are: 1. To transmit power from one shaft to another, efficiently and effectively. 2. To accommodate slight shaft misalignments which develop in service. The secondary functions of flexible couplings are: Shafts become misaligned during operation because of settling foundations, the effects of heat, vibration, etc. These misalignments take...

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Couplings REX® THOMAS® COUPLING SELECTION SELECTION PROCEDURES SERVICE FACTORS DISC COUPLING SELECTION PROCEDURE Service Factors are a means of classifying different equipment and applications into various load classifications. Due to variations in application of equipment, service factors are used to adjust equipment ratings to accommodate for variable loading conditions. The following procedure can be used to select Disc couplings for most applications. For applications involving other than normal loading or design, special consideration must be given to coupling selection. Rexnord application...

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Couplings REX® THOMAS® COUPLING SELECTION TYPICAL SERVICE FACTORS – MOTOR AND TURBINE DRIVEN EQUIPMENT* Application Typical Service Factor AGITATORS Pure Liquids . . . . . . . . . . . . . . . . . .1.0 Variable Density . . . . . . . . . . . . . . . .1.5 ALTERNATOR . . . . . . . . . . . . . . . . . .1.5 BLOWERS Centrifugal . . . . . . . . . . . . . . . . . . . .1.0 Lobe . . . . . . . . . . . . . . . . . . . . . . . .1.5 Vane . . . . . . . . . . . . . . . . . . . . . . . .1.5 BRIQUETTER MACHINES . . . . . . . .2.0 CAN FILLING MACHINES . . . . . . . . .1.0 CANE KNIVES . . . . . . . . . . . . . ....

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Couplings REX® THOMAS® FLEXIBLE DISC COUPLINGS SELECTION EXAMPLE A 250 HP electric motor is driving a dredge pump at 1,800 RPM. The shaft size of the motor is 23/8 the shaft of the pump is 21/8. The distance between the shaft ends (DBSE) is 5 inches. The environment is 150° F. HP/100 RPM = 250 HP × 100 1800 RPM = 13.89 HP/100 RPM OR Application Torque = 250HP × 63,000 = 8,750 lb.-in 1,800 Service factor (See typical service factor on page 8) = 2.0 Use chart on page 17 for HP/RPM OR Application torque requirements × Service factor – 8,750 × 2 = 17,500 Excerpt of page 17 – Series 52 Coupling Siz...

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Couplings REX® THOMAS® FLEXIBLE DISC COUPLINGS ORDERING INSTRUCTIONS PROCEDURES The following bore will be furnished when tolerance and type of fit are not specified. (Does not apply to miniature and DBZ stocked bores.) Nominal Bore Dia. Over Thru … 11/2 Bore Tolerance +0.0000-0.0005 11/2 3 +0.0000-0.001 3 6 +0.0000-0.0015 6 12 +0.0000-0.002 See page 11 for types of fits and shaft diameters. 1. 2. 3. 4. 5. 6. Quantity Coupling Size and Type Bore Sizes Keyway and Setscrew Sizes (if non-standard) Dynamic Balancing if required Additional Data (where applicable) (a) Disc Pack material (if other than...

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Couplings REX® THOMAS® FLEXIBLE DISC COUPLINGS ORDERING INFORMATION BORE SPECIFICATIONS Couplings will be bored in accordance with AGMAStandard 9002-A86. The type of bore fit normally supplied by Rexnord is listed below. DBZ Straight Bore – Class I Clearance Fit – Stocked Straight Bore – Interference Fit on Bore-To-Order Sizes ➀ Taper Bore – To Customer Specification AMR, BMR, CMR, SN, SF, Straight Bore – Interference Fit on All Bores ➀ SV, ST, 52, Taper bore – To Customer Specification 54RDG, 71 Series All Bores per Customer Specification 63/THP Miniatures See page 34-36 ➀ Unless specified otherwise...

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Thomas® Coupling Catalog

Thomas® Coupling Catalog

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