Shop Keyed Couplings
Couplings are used to "couple" a pump and motor or engine together. One coupling half slips over the shaft of your engine or motor, one coupling half
slips over the shaft of your pump, and the flexible insert goes in between to mate the two halves together. The higher the series of your coupling, the more robust the coupling. The close machining tolerances of these couplings assures vibration-free operation and easy, accurate alignment without need for special tools.
Magnaloy Coupling Hub part numbers may be specified using the following format: Start with letter “M” designating Magnaloy, followed by 3 digit
Model Code (100, 200, etc.), then the specific 5 digit Bore/Key Code. All standard combinations of each series are shown below.
Coupling Type:
Material:
Bore Sizes:
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Series 100 Keyed Flexible Insert Coupling Halves
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Series 200 Keyed Flexible Insert Coupling Halves
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Series 300 Keyed Flexible Insert Coupling Halves
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Series 400 Keyed Flexible Insert Coupling Halves
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Series 500 Keyed Flexible Insert Coupling Halves
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Product SKU ▼ | Model ▼ | Coupling Series ▼ | Coupling Type ▼ | Bore Size ▼ | Key Size ▼ | Lead Time ▼ | Price ▼ |
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M500M4812 | 500 48MMBX12MMK : Magnaloy 500 HUB 48MM BORE X 12MM KEY METRIC | 500 | Keyed | 48mm | 12mm | 1-3 Days | $79.99 |
M500M4814 | 500 48MMBX14MMK : Magnaloy 500 HUB 48MM BORE X 14MM KEY METRIC | 500 | Keyed | 48mm | 14mm | 1-3 Days | $79.99 |
M500M4816 | 500 48MMBX16MMK : Magnaloy 500 HUB 48MM BORE X 16MM KEY | 500 | Keyed | 48mm | 16mm | 1-3 Days | $95.99 |
M50002004S | 500 5/8BX1/8K : Magnaloy 500 HUB 5/8" BORE X 1/8" KEY SPECIAL | 500 | Keyed | 0.625 (5/8") | 0.125 (1/8") | 1-3 Days | $79.99 |
M50002006S | 500 5/8BX3/16K : Magnaloy 500 HUB 5/8" BORE X 3/16" KEY SPECIAL | 500 | Keyed | 0.625 (5/8") | 0.1875 (3/16") | 1-3 Days | $79.99 |
M50002005S | 500 5/8BX5/32K : Magnaloy 500 HUB 5/8" BORE X 5/32" KEY SPECIAL | 500 | Keyed | 0.625 (5/8") | 0.15625 (5/32") | 1-3 Days | $79.99 |
M500020N | 500 5/8BXNOK : Magnaloy 500 HUB 5/8" BORE X NO KEY | 500 | Keyed | 0.625 (5/8") | NONE | 1-3 Days | $79.99 |
M500M5012 | 500 50MMBX12MMK : Magnaloy 500 HUB 50MM BORE X 12MM KEY | 500 | Keyed | 50mm | 12mm | 1-3 Days | $79.99 |
M500M5014 | 500 50MMBX14MMK : Magnaloy 500 HUB 50MM BORE X 14MM KEY METRIC | 500 | Keyed | 50mm | 14mm | 1-3 Days | $79.99 |
M500M5016 | 500 50MMBX16MMK : Magnaloy 500 HUB 50MM X 16MM KEY METRIC | 500 | Keyed | 50mm | 16mm | 1-3 Days | $79.99 |
M500M5018 | 500 50MMBX18MMK : Magnaloy 500 HUB 50MM BORE X 18MM KEY | 500 | Keyed | 50mm | 18mm | 1-3 Days | $79.99 |
M500M5216 | 500 52MMBX16MMK : Magnaloy 500 HUB 52MM BORE X 16MM KEY | 500 | Keyed | 52mm | 16mm | 1-3 Days | $79.99 |
M500M5308S | 500 53MMBX1/4K : Magnaloy 500 HUB 53MM BORE X 1/4" KEY SPECIAL | 500 | Keyed | 53mm | 0.25 (1/4") | 1-3 Days | $95.99 |
M500M5412 | 500 54MMBX12MMK : Magnaloy 500 HUB 54MM BORE X 12MM KEY | 500 | Keyed | 54mm | 12mm | 1-3 Days | $79.99 |
M500M5413 | 500 54MMBX13MMK : Magnaloy 500 HUB 54MM BORE X 13MM KEY | 500 | Keyed | 54mm | 13mm | 1-3 Days | $95.99 |
M500M5510 | 500 55MMBX10MMK : Magnaloy 500 HUB 55MM BORE X 10MM KEY METRIC | 500 | Keyed | 55mm | 10mm | 1-3 Days | $79.99 |
M500M5512 | 500 55MMBX12MMK : Magnaloy 500 HUB 55MM BORE X 12MM KEY | 500 | Keyed | 55mm | 12mm | 1-3 Days | $79.99 |
M500M5515 | 500 55MMBX15MMK : Magnaloy 500 HUB 55MM BORE X 15MM KEY METRIC | 500 | Keyed | 55mm | 15mm | 1-3 Days | $79.99 |
M500M5516 | 500 55MMBX16MMK : Magnaloy 500 HUB 55MM BORE X 16MM KEY METRIC | 500 | Keyed | 55mm | 16mm | 1-3 Days | $79.99 |
M500M5516C | 500 55MMBX16MMK : Magnaloy 500 HUB 55MM BORE X 16MM KEY W/CLAMP | 500 | Keyed | 55mm | 16mm | 1-3 Days | $112.99 |
M500M5816 | 500 58MMBX16MMK : Magnaloy 500 HUB 58MM BORE X 16MM KEY | 500 | Keyed | 58mm | 16mm | 1-3 Days | $95.99 |
M500M6016 | 500 60MMBX16MMK : Magnaloy 500 HUB 60MM BORE X 16MM KEY METRIC | 500 | Keyed | 60mm | 16mm | 1-3 Days | $79.99 |
M500M6017 | 500 60MMBX17MMK : Magnaloy 500 HUB 60MM BORE X 17MM KEY | 500 | Keyed | 60mm | 17mm | 1-3 Days | $79.99 |
M500M6018 | 500 60MMBX18MMK : Magnaloy 500 HUB 60MM BORE X 18MM KEY | 500 | Keyed | 60mm | 18mm | 1-3 Days | $79.99 |
M50002808 | 500 7/8BX1/4K : Magnaloy 500 HUB 7/8" BORE X 1/4" KEY | 500 | Keyed | 0.875 (7/8") | 0.25 (1/4") | Same Day | $62.99 |
M50002806C | 500 7/8BX3/16K : Magnaloy 500 HUB 7/8" BORE X 3/16" KEY W/CLAMP | 500 | Keyed | 0.875 (7/8") | 0.1875 (3/16") | 1-3 Days | $96.99 |
M50002806 | 500 7/8BX3/16K : Magnaloy 500 HUB 7/8" BORE X 3/16" KEY | 500 | Keyed | 0.875 (7/8") | 0.1875 (3/16") | Same Day | $62.99 |
M50002810S | 500 7/8BX5/16K : Magnaloy 500 HUB 7/8" BORE X 5/16" KEY SPECIAL | 500 | Keyed | 0.875 (7/8") | 0.3125 (5/16") | 1-3 Days | $95.99 |
M500028N | 500 7/8BXNOK : Magnaloy 500 HUB 7/8" BORE X NO KEY | 500 | Keyed | 0.875 (7/8") | NONE | 1-3 Days | $79.99 |
M50001804S | 500 9/16BX1/8K : Magnaloy 500 HUB 9/16" BORE X 1/8" KEY SPECIAL | 500 | Keyed | 0.5625 (9/16") | 0.125 (1/8") | 1-3 Days | $79.99 |
M500R | 500 NO BORE : Magnaloy 500 HUB NO BORE | 500 | Keyed | NONE | NONE | 1-3 Days | $57.99 |
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Series 600 Keyed Flexible Insert Coupling Halves
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Series 700 Keyed Flexible Insert Coupling Halves
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Series 800 Keyed Flexible Insert Coupling Halves
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Series 900 Keyed Flexible Insert Coupling Halves
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Product SKU ▼ | Model ▼ | Coupling Series ▼ | Coupling Type ▼ | Bore Size ▼ | Key Size ▼ | Lead Time ▼ | Price ▼ |
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Coupling Options
Double Set Screws or Clamp options are ideal for improved shaft retention. Just add a 'DSS' or 'C' at the end of the part numbers above to add those options.

Standard Style

Double Set Screw Style
Ideal for improved shaft
retention of keyed shafts.

Clamp Style
Ideal for improved shaft
retention of splined shafts.
Spare Parts
Our full range of flexible inserts permit custom design performance for a wide range of applications. All insert materials offer complete electrical insulation, as our factory design eliminates all metal-to-metal contact. Which Coupling Insert you select will vary based on the application, but the series of your Coupling Insert must match the series of the Coupling Halves. For example, a 200 Series Coupling must use a 200 Series Coupling Insert.
Don't see what you need? Give us a call! Special combinations may be available upon request.
Want to view all keyed coupling options? Click HERE for our full collection.