Fafnir® Single Row Imperial Ball Screw Support Bearings (MM9-H) On The Timken Company

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Timken® angular contact ball bearings are designed for combination radial and axial loading. Single-row bearings have high thrust capacity in one direction. Some single-row bearings are specifically designed for duplex mounting in sets for maximum performance.

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Rows per Set

d - Bore (mm)

D - Outer Diameter (mm)

D - Outer Diameter (in)

Bearing Width (mm)

Bearing Width (in)

Total Width (mm)

Total Width (in)

Ce - Dynamic Radial Rating (per row) (N)

Ce - Dynamic Radial Rating (per row) (lbf)

Limiting Speed (Grease) (per row) (rpm)

Limiting Speed (Oil) (per row) (rpm)

Part Number	Rows per Set	d - Bore	D - Outer Diameter	Bearing Width	Total Width	Contact Angle	C0 - Static Radial Rating (per row)	Ce - Dynamic Radial Rating (per row)	Ball Type	CAD

MM9306WI 2H DUH	N/A Duplex	N/A 20 mm	N/A 47 mm1.8504 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 24900 N5600 lbf	N/A 24900 N5600 lbf	N/A STEEL	N/A
MM9308WI 2H DUH	N/A Duplex	N/A 23.8 mm	N/A 62 mm2.4409 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 35600 N8000 lbf	N/A 29800 N6700 lbf	N/A STEEL	N/A
MM9310WI 2H DUH	N/A Duplex	N/A 38.1 mm	N/A 72 mm2.8346 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 45400 N10200 lbf	N/A 36300 N8150 lbf	N/A STEEL	N/A
MM9311WI 3H DUH	N/A Duplex	N/A 44.5 mm	N/A 76.2 mm3 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 50700 N11400 lbf	N/A 38500 N8650 lbf	N/A STEEL	N/A
MM9313WI 5H DUH	N/A Duplex	N/A 57.2 mm	N/A 90 mm3.5433 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 60900 N13700 lbf	N/A 41400 N9300 lbf	N/A STEEL	N/A
MM9316WI 3H DUH	N/A Duplex	N/A 76.2 mm	N/A 110 mm4.3307 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 77000 N17300 lbf	N/A 44500 N10000 lbf	N/A STEEL	N/A
MM9321WI 3H DUH	N/A Duplex	N/A 101.600 mm	N/A 145 mm5.7087 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 115700 N26000 lbf	N/A 57400 N12900 lbf	N/A STEEL	N/A
MM9326WI 6H DUH	N/A Duplex	N/A 127 mm	N/A 180 mm7.0866 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 186800 N42000 lbf	N/A 94300 N21200 lbf	N/A STEEL	N/A
MM9306WI 2H DUM	N/A Duplex	N/A 20 mm	N/A 47 mm1.8504 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 24900 N5600 lbf	N/A 24900 N5600 lbf	N/A STEEL	N/A
MM9308WI 2H DUM	N/A Duplex	N/A 23.8 mm	N/A 62 mm2.4409 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 35600 N8000 lbf	N/A 29800 N6700 lbf	N/A STEEL	N/A
MM9310WI 2H DUM	N/A Duplex	N/A 38.1 mm	N/A 72 mm2.8346 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 45400 N10200 lbf	N/A 36300 N8150 lbf	N/A STEEL	N/A
MM9311WI 3H DUM	N/A Duplex	N/A 44.5 mm	N/A 76.2 mm3 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 50700 N11400 lbf	N/A 38500 N8650 lbf	N/A STEEL	N/A
MM9313WI 5H DUM	N/A Duplex	N/A 57.2 mm	N/A 90 mm3.5433 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 60900 N13700 lbf	N/A 41400 N9300 lbf	N/A STEEL	N/A
MM9316WI 3H DUM	N/A Duplex	N/A 76.2 mm	N/A 110 mm4.3307 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 77000 N17300 lbf	N/A 44500 N10000 lbf	N/A STEEL	N/A
MM9321WI 3H DUM	N/A Duplex	N/A 101.600 mm	N/A 145 mm5.7087 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 115700 N26000 lbf	N/A 57400 N12900 lbf	N/A STEEL	N/A
MM9326WI 6H DUM	N/A Duplex	N/A 127 mm	N/A 180 mm7.0866 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 186800 N42000 lbf	N/A 94300 N21200 lbf	N/A STEEL	N/A
MM9306WI 2H DUL	N/A Duplex	N/A 20 mm	N/A 47 mm1.8504 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 24900 N5600 lbf	N/A 24900 N5600 lbf	N/A STEEL	N/A
MM9308WI 2H DUL	N/A Duplex	N/A 23.8 mm	N/A 62 mm2.4409 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 35600 N8000 lbf	N/A 29800 N6700 lbf	N/A STEEL	N/A
MM9310WI 2H DUL	N/A Duplex	N/A 38.1 mm	N/A 72 mm2.8346 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 45400 N10200 lbf	N/A 36300 N8150 lbf	N/A STEEL	N/A
MM9311WI 3H DUL	N/A Duplex	N/A 44.5 mm	N/A 76.2 mm3 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 50700 N11400 lbf	N/A 38500 N8650 lbf	N/A STEEL	N/A
MM9313WI 5H DUL	N/A Duplex	N/A 57.2 mm	N/A 90 mm3.5433 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 60900 N13700 lbf	N/A 41400 N9300 lbf	N/A STEEL	N/A
MM9316WI 3H DUL	N/A Duplex	N/A 76.2 mm	N/A 110 mm4.3307 in	N/A 15.88 mm0.625 in	N/A 31.76 mm1.25 in	N/A 60 º	N/A 77000 N17300 lbf	N/A 44500 N10000 lbf	N/A STEEL	N/A
MM9321WI 3H DUL	N/A Duplex	N/A 101.600 mm	N/A 145 mm5.7087 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 115700 N26000 lbf	N/A 57400 N12900 lbf	N/A STEEL	N/A
MM9326WI 6H DUL	N/A Duplex	N/A 127 mm	N/A 180 mm7.0866 in	N/A 22.23 mm0.8750 in	N/A 44.46 mm1.75 in	N/A 60 º	N/A 186800 N42000 lbf	N/A 94300 N21200 lbf	N/A STEEL	N/A
MM9306WI 2H QUH	N/A Quadruplex	N/A 20 mm	N/A 47 mm1.8504 in	N/A 15.88 mm0.625 in	N/A 63.52 mm2.5000 in	N/A 60 º	N/A 24900 N5600 lbf	N/A 24900 N5600 lbf	N/A STEEL	N/A

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