Morse 643903 — Clutches & Brakes
KKM Solutions is an independent parts distributor, not an authorized Morse dealer — how we source.
Morse 643903 - Cam Clutches - Width: 4.4 mm; Length: 4.8 ft; Height: 3.4 mm.
Overview
Part number 643903 from Morse, listed in Clutches & Brakes. Specifications on file: Additional Bearing Support Requirement No; Backstopping Clutch Yes; Bore (Max) (in) 0.875; Bore (Min) (in) 0.625. KKM Solutions quotes this part with pricing and availability confirmed per order.
This listing covers the Morse 643903, a part number in the Cam Clutches category. The manufacturer's published data for this part number specifies Width: 4.4 mm and Length: 4.8 ft.
Key manufacturer data on file for this item includes Height: 3.4 mm; Mode of operation: High Speed inner race overrunning; Type: CAM Clutches; Model: MO; Product type: M Series; Bore Size (in): 0.75; Outer Width (in): 2.625; Bore (Max) (in): 0.875; Bore (Min) (in): 0.625; Additional Bearing Support Requirement: No; Backstopping Clutch: Yes; Indexing Clutch: Yes. The complete technical table is shown in the Specifications tab on this page.
Specifications
| Additional Bearing Support Requirement | No |
|---|---|
| Backstopping Clutch | Yes |
| Bore (Max) (in) | 0.875 |
| Bore (Min) (in) | 0.625 |
| Bore Size (in) | 0.75 |
| Clutch size code | 400 |
| Height | 3.4 mm |
| Indexing Clutch | Yes |
| Inner Race Width (in) | 2.75 |
| Length | 4.8 ft |
| Lubrication Type | Grease |
| Mode of operation | High Speed inner race overrunning |
| Model | MO |
| Nominal Overrunning Drag (ft-lb) | 0.21 |
| Outer Width (in) | 2.625 |
| Overall Diameter (in) | 3.5 |
| Overrunning Clutch | Yes |
| Product type | M Series |
| Rated Torque Capacity (ft.-lbs.) | 400 |
| RPM Max. - Inner Race | 3600 |
| RPM Max. - Outer Race | 800 |
| Type | CAM Clutches |
| Width | 4.4 mm |
Product details
| Manufacturer | Morse |
|---|---|
| Manufacturer part number | 643903 |
| Product category | Clutches & Brakes |
| Published specifications | 23 attributes listed |
| Related part numbers | 1 other part number in this family |
Request a quote for this part
Email orderdesk@kkmsolutions.com or call (825) 454-5367 for pricing and availability.
Frequently Asked Questions
How do I get pricing for 643903?
This part is quoted on request, so no price is listed for it here. Send the quote form on this page with your quantity, or email orderdesk@kkmsolutions.com, and our order desk will reply with pricing and availability within 1 business day.
Who manufactures the 643903?
643903 is made by Morse and is listed in our Clutches & Brakes category. KKM Solutions is an independent distributor, not an authorized Morse dealer: we source the exact Morse part number 643903, and the quote confirms condition and lead time before you order.
Is the 643903 new and genuine?
Parts we supply are new and genuine unless the quote expressly states otherwise. Where a part is new-old-stock, from excess inventory, refurbished or open-box, the quote says so before you approve it.
What warranty comes with the 643903, and can I return it?
Parts we supply are warranted against manufacturing defects for 1 year from the date of delivery; where the manufacturer's own warranty is longer, the manufacturer's warranty applies. The warranty covers repair, replacement, or credit of the defective part and does not cover normal wear items, misapplication, improper installation, or consequential damages. Contact us within 30 days of delivery before returning anything — all returns need a return authorization from the order desk.
What is the lifecycle status of 643903?
No published lifecycle status is on file for 643903. Morse lists whether a catalog number is current, superseded or end-of-life on its own product page, and our order desk confirms the status with the manufacturer at quote time, before you commit. Send the part number through the quote form on this page.
What are the key specifications of 643903?
Key specifications include Additional Bearing Support Requirement: No; Backstopping Clutch: Yes; Bore (Max) (in): 0.875; Bore (Min) (in): 0.625. The full specification table on this page lists every published attribute for this part.
What is the bore size of 643903?
Per the published specification for 643903: Bore Size (in): 0.75. Confirm against the full specification table on this page, or ask our order desk to verify it with the manufacturer at quote time.
How quickly can 643903 ship?
Lead time for 643903 is quoted per order and confirmed on your quote, which our order desk sends within 1 business day. For a line-down emergency, call the 24/7 order desk at (825) 454-5367.
Variants & Related Part Numbers
Other Morse part numbers in this family:
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