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Kop-Flex 4F SB FR FB
K-F FAST STANDARD
Material
Medium Carbon Steel
Bolt Type
Shrouded
Bore Size Max (in)
4.25 in
Bore Type
Finished Bore
Need help confirming fit? Send us the current part number, shaft size, housing photo, or equipment model.
Product Overview
- All-metal end ring seal design for maximum service life. The industry standard for over 75 years.
- Provides 300% greater lubricant capacity than o-ring style couplings.
- Greater lubricant capacity allows longer periods between scheduled lubrications and longer service life.
- Straight tooth design provides improved load distribution, lower stresses and longer life for the gear teeth.
| Part Number | 2280840 |
| Brand | Kop-Flex |
| Material | Medium Carbon Steel |
| Bolt Type | Shrouded |
| Bore Size Max (in) | 4.25 in |
| Bore Type | Finished Bore |
| Compatible Bore Size [Min] (in) | 0 in |
| Compatible Bore Size Flex Hub [Min] (in) | 2.625 in |
| Compatible Bore Size Rigid Hub [Min] (in) | 2.5 in |
| Configuration | Flex Rigid |
| Coupling Size | 4 |
| Coupling Type | Gear Coupling |
| Fastener Quantity | 14 |
| Fastener Size | 5/8 x 1 5/8 |
| Length Through Bore (in) | 4.4375 in |
| Lube/Non-Lube | Lubricated |
| Max Bore w/standard key for Flex Hub | 4.25 in |
| Measurement System | Imperial |
| Outside Diameter (in) | 12.5 in |
| Rating HP @ 100 RPM | 375 |
| Speed Max (rpm) | 5,260 rpm |
| Style | FASTS |
| Tooth Profile | Straight Faced Involute Hub tooth |
| Torque [Max] (in-lb) | 472,000 in/lbs |
| Torque Rating (in-lb) | 236,000 in/lbs |
Always verify dimensions, load ratings, material, and seal type before ordering.
| Brandi | Kop-Flex |
| Mfg. Catalog Numberi | 4F SB FR FB |
| Mfg. Part Numberi | 2280840 |
| GDS #i | GDS-109147 |
| Categoryi | Couplings |
| UPCi | 662384011821 |
