Regal Rexnord · Thomas
Thomas SR71 and SR718 Disc Couplings
Thomas disc coupling platforms within Regal Rexnord — SR71 and SR718 families for pumps, compressors and industrial drives requiring flexible disc pack torque transmission. Family-level engineering discovery; designation-level catalogue data not yet verified in repository.
Thomas disc coupling families
Thomas disc couplings within the Regal Rexnord portfolio use flexible disc packs to transmit torque while accommodating misalignment. Golden Bearing Company maintains a single canonical family page for both SR71 and SR718 intent.
Engineering characteristics
Disc coupling principles
Multiple thin discs flex to absorb misalignment without sliding contact in the element. Assemblies may be close-coupled or use spacer tubes for pump and compressor maintenance. Hardware, disc pack and hub designs are series-specific.
Platform families
SR71 and SR718
SR71 and SR718 denote distinct Thomas disc coupling platforms with different size ranges and configuration options. Identification requires installed marking, bore measurement and application duty review. No verified designation-level catalogue data is published on Golden Bearing Company in this batch.
Current platform
Thomas XTSR modular line
Regal Rexnord documents Thomas Series XTSR as the current modular disc platform. XTSR52 enhances legacy Series 52; XTSR71 enhances legacy Series 71. Legacy Series 52 and 71 remain listed for identification. This is portfolio platform context only — not a size-for-size cross-reference map.
Selection guidance
Identifying Thomas disc couplings
- Confirm installed hub marking and whether the duty is legacy SR71/SR718 or current XTSR modular platform.
- Measure bore sizes, shaft gap and note close-coupled versus spacer configuration.
- Record torque duty, speed, misalignment and environmental conditions.
- For legacy name routing (Torsiflex-I, Form-Flex spacer), use governed identification context only — not assumed interchange.
- Send photographs of hub marking and application data for platform identification.
Applications
Typical engineering use
Disc couplings are common on pumps, compressors, blowers, gearboxes and test equipment where precise torque transmission and defined misalignment capacity are required. Environmental factors and cyclic duty influence disc pack selection.
Legacy identification
Historic disc coupling routing
Manufacturer obsolescence notices identify these discontinued names as routing toward Rexnord Thomas disc couplings:
- TB Wood's Torsiflex-I and Bibby Torsiflex disc couplings
- TB Wood's Form-Flex heavy duty spacer series GCH, GCF, HSH and FSH only — directed to Thomas AMR/CMR for gas compression duty (partial scope; other Form-Flex types remain current)
Other historical disc coupling trade names are not automatically equivalent to SR71, SR718 or XTSR without manufacturer documentation and application confirmation.
Thomas disc coupling platforms
XTSR platform
Current modular Thomas disc line (XTSR52, XTSR71 and related configurations). Portfolio context; legacy Series 52/71 remain listed.
SR71 platform
Thomas SR71 disc coupling family within the Regal Rexnord portfolio. Send installed marking and application data for identification support.
SR718 platform
Thomas SR718 disc coupling family with distinct size range and configuration options from SR71. Confirm platform from hub marking or equipment documentation.
Engineering enquiry
No verified designation catalogue is published in this batch. Send application data for engineering review.
Engineering enquiry
Golden Bearing Company is an authorised Regal Rexnord distributor for Thomas disc coupling identification and quotation support.
Provide torque, speed, bore, shaft gap and service conditions for Thomas disc coupling identification.
Have a part number or designation?
Send manufacturer part numbers, bore sizes or coupling designations for engineering identification and quotation support. This is an identification/interchange enquiry—not a live stock lookup or availability confirmation.
Common questions
SR71 and SR718 denote distinct Thomas disc coupling platforms within the Rexnord catalogue, with different size ranges and configuration options. Confirm the installed marking or send photographs for identification support.
Disc couplings are generally non-lubricated flexible couplings. Maintenance focuses on disc pack inspection, bolt torque and alignment per manufacturer guidance.
Verified designation-level technical data for Thomas SR71 and SR718 is not yet established in the product catalogue. This family page provides engineering discovery and enquiry support until verified data is available.
XTSR is the current modular Thomas disc platform documented by Regal Rexnord. XTSR52 and XTSR71 enhance legacy Series 52 and 71 respectively. Legacy SR71 and SR718 remain listed for identification context.
Send hub marking photographs, bore dimensions, shaft gap, torque duty, speed and service conditions. For legacy name routing (Torsiflex-I, Form-Flex spacer), include the installed trade name.
Where to go next
Rexnord SpidaLink couplings
Composite disc alternative with verified catalogue.
View detailsRexnord Omega elastomeric
Elastomeric family for general industrial pump duty.
View detailsTB Wood's legacy identification
Historic elastomeric coupling name context for cross-reference routing.
View detailsEngineering enquiry
Send torque, speed and bore data for Thomas disc identification.
View details