QUICK FLEX Standard Hubs with Keyway - Inch (Imperial) Bores On The Timken Company

Part Number	Description	Bore Size	Coupling Size	Keyway Size (W x D)	Length thru Bore	CAD
88345044244	N/A QF250X3-7/8U	N/A 3-7/8 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345043052	N/A QF250X4-1/8	N/A 4-1/8 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345043053	N/A QF250X4-1/8U	N/A 4-1/8 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345044232	N/A QF250X2-5/16	N/A 2-5/16 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345044234	N/A QF250X2-7/16	N/A 2-7/16 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345044203	N/A QF250S303X2-15/16	N/A 2-15/16 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345044229	N/A QF250X2-15/16	N/A 2-15/16 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345043035	N/A QF250X2-15/16U	N/A 2-15/16 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345043215	N/A QF250X3-1/16	N/A 3-1/16 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345044240	N/A QF250X3-3/16	N/A 3-3/16 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345044242	N/A QF250X3-5/16	N/A 3-5/16 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345043050	N/A QF250X3-7/16	N/A 3-7/16 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345044245	N/A QF250X3-9/16	N/A 3-9/16 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345043051	N/A QF250X3-9/16U	N/A 3-9/16 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345043044	N/A QF250X3-11/16	N/A 3-11/16 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345044207	N/A QF250S303X3-15/16	N/A 3-15/16 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345040991	N/A QF250X3-15/16	N/A 3-15/16 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345044239	N/A QF250X3-15/16U	N/A 3-15/16 in	N/A 250	N/A 1/x1/2 in	N/A 3.1 in78.7 mm	N/A
88345095970	N/A QF250S303XPB	N/A Pilot 1 1/2" in	N/A 250	N/A No Keyway in	N/A 3.1 in78.7 mm	N/A

88345044244

N/A QF250X3-7/8U

N/A 3-7/8 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345043052

N/A QF250X4-1/8

N/A 4-1/8 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345043053

N/A QF250X4-1/8U

N/A 4-1/8 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345044232

N/A QF250X2-5/16

N/A 2-5/16 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345044234

N/A QF250X2-7/16

N/A 2-7/16 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345044203

N/A QF250S303X2-15/16

N/A 2-15/16 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345044229

N/A QF250X2-15/16

N/A 2-15/16 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345043035

N/A QF250X2-15/16U

N/A 2-15/16 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345043215

N/A QF250X3-1/16

N/A 3-1/16 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345044240

N/A QF250X3-3/16

N/A 3-3/16 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345044242

N/A QF250X3-5/16

N/A 3-5/16 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345043050

N/A QF250X3-7/16

N/A 3-7/16 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345044245

N/A QF250X3-9/16

N/A 3-9/16 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345043051

N/A QF250X3-9/16U

N/A 3-9/16 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345043044

N/A QF250X3-11/16

N/A 3-11/16 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345044207

N/A QF250S303X3-15/16

N/A 3-15/16 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345040991

N/A QF250X3-15/16

N/A 3-15/16 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345044239

N/A QF250X3-15/16U

N/A 3-15/16 in

N/A 250

N/A 1/x1/2 in

N/A 3.1 in78.7 mm

N/A

88345095970

N/A QF250S303XPB

N/A Pilot 1 1/2" in

N/A 250

N/A No Keyway in

N/A 3.1 in78.7 mm

N/A

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No Preference
1
1/2
11/16
1-1/16
1-1/2
1-1/4
1-1/8
1-11/16
1-15/16
13/16
1-3/16
1-3/4
1-3/8
15/16
1-5/16
1-5/32
1-5/8
1-7/16
1-7/8
1-9/16
2
2-1/16
2-1/2
2-1/4
2-1/8
2-11/16
2-13/16
2-15/16
2-3/16
2-3/4
2-3/8
2-5/16
2-5/8
2-7/16
2-7/8
2-9/16
3
3/4
3/8
3-1/16
3-1/2
3-1/4
3-1/8
3-11/16
3-15/16
3-3/16
3-3/4
3-3/8
3-5/16
3-5/8
3-7/16
3-7/8
3-9/16
4
4-1/4
4-1/8
5/8
7/8
9/16
Pilot
Pilot 1 1/2"
Pilot 1"
Pilot 15/16
Pilot 17/32
Pilot 23/32
Pilot 5/8
Solid

No Preference
1/2 x 1/4
1/2 x1/4
1/2x1/4
1/4 x 1/8
1/4x1/8
1/8 x 1/16
1/8x1/16
1/x1/2
1x1/2
3/16 x 3/32
3/16x3/32
3/32 x 3/64
3/4x3/8
3/8 x 3/16
3/8x3/16
5/16 x 5/32
5/16x5/32
5/8x5/16
7/8x7/16
No Keyway

Bore Size (in)

Coupling Size

Keyway Size (in)

Part Number

Description

Bore Size

Coupling Size

Keyway Size (W x D)

Length thru Bore

CAD