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Most orders ship within 1–2 business days via UPS. Larger equipment ships via freight carrier, and customers can use the shipping estimator on the product page for a location-specific quote. Local pickup is also available at the Fairfield, IL facility, typically ready within 4 hours.

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MRO Exchange accepts all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available, with payment due prior to shipment. Custom terms are available for established accounts.

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KTR Systems Backlash-Free Jaw Coupling M646-RDR 42 to 48

$239.00 USD

Sale Sold out

ConditionOpen Box - Unused MPNM646-RDR Stock #0226-00382

Photos reflect current condition. Items differing from description may be eligible for return or refund — see our condition guide.

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Estimated package weight: 5.0 lbs

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This listing is for one KTR ROTEX GS series backlash-free jaw coupling, complete assembly with green elastomeric spider element installed between two aluminum clamping ring hubs. The unit is confirmed as a KTR ROTEX GS series coupling by the engraved text visible on the hub body reading www.ktr.com and ROTEX GS. The green spider color is consistent with a mid-range Shore hardness spider element in the KTR ROTEX GS product line.

The internal part number M646-RDR appears on the box label along with lot code 1Z691E82034155 and a manufacturing date of November 10, 2022. The label origin is Carrollton, KY 41008, consistent with a major automotive or industrial OEM facility. The P: M6 and I: 10 designations on the label are internal OEM tracking codes and do not reflect the KTR part number.

The ROTEX GS series is a three-part backlash-free servo coupling designed for torsionally stiff, vibration-damping torque transmission in precision servo drive and CNC machine tool applications. It compensates for radial, axial, and angular shaft misalignment. The assembled unit appears unused and is consistent with new old stock condition. Original packaging box is included.

Stock # 0226-382

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Frequently Asked Questions

Shipping & Handling

Most orders ship within 1–2 business days via UPS, but expedited same-day handling is available as an add-on to orders in cart. Larger equipment ships via freight carrier. Use the shipping estimator above for a location-specific quote. Local pickup is also available at our Fairfield, IL facility, typically ready within 4 hours.

Returns & Condition

All items are sold as-described based on the photos and condition listed. If an item arrives differing from its description, it may be eligible for return or refund. See our full condition guide for details on our grading terms.

Payment Options

We accept all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available by selecting "Purchase Order / Wire Transfer" at checkout. Payment is due prior to shipment. Contact us for custom terms on established accounts. Tax exemptions are honored if proper documentation is provided.