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
88345044230	N/A QF250X2-3/4SH	N/A 2-3/4 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345043036	N/A QF250X2-3/4	N/A 2-3/4 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345044226	N/A QF250X2-1/4U	N/A 2-1/4 in	N/A 250	N/A 1/2x1/4 in	N/A 3.1 in78.7 mm	N/A
88345043034	N/A QF250X2-1/4	N/A 2-1/4 in	N/A 250	N/A 1/2x1/4 in	N/A 3.1 in78.7 mm	N/A
88345044221	N/A QF250X1-3/4	N/A 1-3/4 in	N/A 250	N/A 3/8x3/16 in	N/A 3.1 in78.7 mm	N/A
88345044219	N/A QF250X1-1/4	N/A 1-1/4 in	N/A 250	N/A 1/4x1/8 in	N/A 3.1 in78.7 mm	N/A
88345043041	N/A QF250X3-1/2U	N/A 3-1/2 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345043040	N/A QF250X3-1/2	N/A 3-1/2 in	N/A 250	N/A 7/8x7/16 in	N/A 3.1 in78.7 mm	N/A
88345044225	N/A QF250X2-1/2U	N/A 2-1/2 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345044224	N/A QF250X2-1/2	N/A 2-1/2 in	N/A 250	N/A 5/8x5/16 in	N/A 3.1 in78.7 mm	N/A
88345044218	N/A QF250X1-1/2	N/A 1-1/2 in	N/A 250	N/A 3/8x3/16 in	N/A 3.1 in78.7 mm	N/A
88345044247	N/A QF250X4	N/A 4 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345045753	N/A QF250S303X4	N/A 4 in	N/A 250	N/A 1x1/2 in	N/A 3.1 in78.7 mm	N/A
88345044246	N/A QF250X3U	N/A 3 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345096402	N/A QF250X3	N/A 3 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345044206	N/A QF250S303X3	N/A 3 in	N/A 250	N/A 3/4x3/8 in	N/A 3.1 in78.7 mm	N/A
88345043033	N/A QF250X2	N/A 2 in	N/A 250	N/A 1/2x1/4 in	N/A 3.1 in78.7 mm	N/A
88345044217	N/A QF250X1	N/A 1 in	N/A 250	N/A 1/4x1/8 in	N/A 3.1 in78.7 mm	N/A
88345005332	N/A QF25XPB	N/A Pilot 5/8 in	N/A 25	N/A No Keyway in	N/A 1.81 in46 mm	N/A
88345005296	N/A QF25S303XPB	N/A Pilot 5/8 in	N/A 25	N/A No Keyway in	N/A 1.81 in46 mm	N/A
88345044282	N/A QF25X15/16U	N/A 15/16 in	N/A 25	N/A 1/4x1/8 in	N/A 1.81 in46 mm	N/A
88345044280	N/A QF25X15/16	N/A 15/16 in	N/A 25	N/A 1/4x1/8 in	N/A 1.81 in46 mm	N/A
88345044276	N/A QF25X11/16	N/A 11/16 in	N/A 25	N/A 3/16x3/32 in	N/A 1.81 in46 mm	N/A
88345043690	N/A QF25X7/8U	N/A 7/8 in	N/A 25	N/A 3/16x3/32 in	N/A 1.81 in46 mm	N/A
88345043113	N/A QF25X7/8E	N/A 7/8 in	N/A 25	N/A 1/4x1/8 in	N/A 1.81 in46 mm	N/A

88345044230

N/A QF250X2-3/4SH

N/A 2-3/4 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345043036

N/A QF250X2-3/4

N/A 2-3/4 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345044226

N/A QF250X2-1/4U

N/A 2-1/4 in

N/A 250

N/A 1/2x1/4 in

N/A 3.1 in78.7 mm

N/A

88345043034

N/A QF250X2-1/4

N/A 2-1/4 in

N/A 250

N/A 1/2x1/4 in

N/A 3.1 in78.7 mm

N/A

88345044221

N/A QF250X1-3/4

N/A 1-3/4 in

N/A 250

N/A 3/8x3/16 in

N/A 3.1 in78.7 mm

N/A

88345044219

N/A QF250X1-1/4

N/A 1-1/4 in

N/A 250

N/A 1/4x1/8 in

N/A 3.1 in78.7 mm

N/A

88345043041

N/A QF250X3-1/2U

N/A 3-1/2 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345043040

N/A QF250X3-1/2

N/A 3-1/2 in

N/A 250

N/A 7/8x7/16 in

N/A 3.1 in78.7 mm

N/A

88345044225

N/A QF250X2-1/2U

N/A 2-1/2 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345044224

N/A QF250X2-1/2

N/A 2-1/2 in

N/A 250

N/A 5/8x5/16 in

N/A 3.1 in78.7 mm

N/A

88345044218

N/A QF250X1-1/2

N/A 1-1/2 in

N/A 250

N/A 3/8x3/16 in

N/A 3.1 in78.7 mm

N/A

88345044247

N/A QF250X4

N/A 4 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345045753

N/A QF250S303X4

N/A 4 in

N/A 250

N/A 1x1/2 in

N/A 3.1 in78.7 mm

N/A

88345044246

N/A QF250X3U

N/A 3 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345096402

N/A QF250X3

N/A 3 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345044206

N/A QF250S303X3

N/A 3 in

N/A 250

N/A 3/4x3/8 in

N/A 3.1 in78.7 mm

N/A

88345043033

N/A QF250X2

N/A 2 in

N/A 250

N/A 1/2x1/4 in

N/A 3.1 in78.7 mm

N/A

88345044217

N/A QF250X1

N/A 1 in

N/A 250

N/A 1/4x1/8 in

N/A 3.1 in78.7 mm

N/A

88345005332

N/A QF25XPB

N/A Pilot 5/8 in

N/A 25

N/A No Keyway in

N/A 1.81 in46 mm

N/A

88345005296

N/A QF25S303XPB

N/A Pilot 5/8 in

N/A 25

N/A No Keyway in

N/A 1.81 in46 mm

N/A

88345044282

N/A QF25X15/16U

N/A 15/16 in

N/A 25

N/A 1/4x1/8 in

N/A 1.81 in46 mm

N/A

88345044280

N/A QF25X15/16

N/A 15/16 in

N/A 25

N/A 1/4x1/8 in

N/A 1.81 in46 mm

N/A

88345044276

N/A QF25X11/16

N/A 11/16 in

N/A 25

N/A 3/16x3/32 in

N/A 1.81 in46 mm

N/A

88345043690

N/A QF25X7/8U

N/A 7/8 in

N/A 25

N/A 3/16x3/32 in

N/A 1.81 in46 mm

N/A

88345043113

N/A QF25X7/8E

N/A 7/8 in

N/A 25

N/A 1/4x1/8 in

N/A 1.81 in46 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