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

QUICK FLEX couplings consist of two hubs, one insert, and a cover.

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Bore Size (in)

Coupling Size

Keyway Size (in)

Part Number	Bore Size	Coupling Size	Keyway Size (W x D)	Length thru Bore	CAD

QF5S303X1	N/A 1 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1U	N/A 1 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1-1/4	N/A 1-1/4 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1-1/4E	N/A 1-1/4 in	N/A 5	N/A 5/16X5/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1-1/8	N/A 1-1/8 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1-1/16	N/A 1-1/16 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1-3/16	N/A 1-3/16 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X1/2	N/A 1/2 in	N/A 5	N/A 1/8x1/16 in	N/A 1.08 in27.4 mm	N/A
QF5S303X3/4	N/A 3/4 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X3/4E	N/A 3/4 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X3/4U	N/A 3/4 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X3/8	N/A 3/8 in	N/A 5	N/A 3/32 x 3/64 in	N/A 1.08 in27.4 mm	N/A
QF5S303X3/8E	N/A 3/8 in	N/A 5	N/A 1/8 x 1/16 in	N/A 1.08 in27.4 mm	N/A
QF5S303X5/8	N/A 5/8 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X5/8U	N/A 5/8 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X7/8	N/A 7/8 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X7/8E	N/A 7/8 in	N/A 5	N/A 1/4x1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303X9/16	N/A 9/16 in	N/A 5	N/A 1/8 x 1/16 in	N/A 1.08 in27.4 mm	N/A
QF5S303X13/16	N/A 13/16 in	N/A 5	N/A 3/16 x 3/32 in	N/A 1.08 in27.4 mm	N/A
QF5S303X15/16	N/A 15/16 in	N/A 5	N/A 1/4 x 1/8 in	N/A 1.08 in27.4 mm	N/A
QF5S303XPB	N/A Pilot in	N/A 5	N/A No Keyway in	N/A 1.08 in27.4 mm	N/A
QF15S303X1	N/A 1 in	N/A 15	N/A 1/4 x 1/8 in	N/A 1.34 in34 mm	N/A
QF15S303X1E	N/A 1 in	N/A 15	N/A 5/16 x 5/32 in	N/A 1.34 in34 mm	N/A
QF15S304X1	N/A 1 in	N/A 15	N/A 1/4 x 1/8 in	N/A 1.34 in34 mm	N/A
QF15X1	N/A 1 in	N/A 15	N/A 1/4 x 1/8 in	N/A 1.34 in34 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

Bore Size

Coupling Size

Keyway Size (W x D)

Length thru Bore

CAD