Shaft-Saver™ Timing Pulleys

York Shaft Saver™ Pulleys prevent the usual shaft damage caused by set screws, allowing easy replacement or re-adjustment of timing pulleys in the field.

SHAFT SAVER VS STANDARD SET SCREWS

A SET SCREW SHOULD

  • Firmly secure the timing pulley on the shaft
  • Permit precise radial adjustment on timing drives
  • Allow easy replacement or re-adjustment of timing pulleys in the field

A SET SCREW SHOULD NOT

  • Damage or deform the shaft in any way
  • Make replacement or adjustment of timing pulleys difficult or impossible

Cup point setscrews are the industry standard for securing timing pulleys to a shaft. They do, however, make a crater in the shaft, pushing material up around the tip of the screw. This can make subsequent removal of the pulley or radial adjustment almost impossible. There are ways to minimize this problem, but all require extra machining steps on the shaft and still don’t allow fine radial adjustment of the pulley. Slotted hubs are another attempt to solve this problem, but they, too, require extra machining steps and/or extra parts and are often more costly and not available from stock.

York Shaft-Savers Pulleys eliminate all these problems. They are equipped with a special copper alloy tip that completely conforms
to shafts made of any material without damaging them in any way.

SHAFT-SAVER

  • Can be delivered in all York standard pulleys at low cost and from stock
  • Makes removal of pulleys or re-adjustment easy without damaging the shaft
  • Holding power is not diminished by grease, oil or dirt
  • Can be reused at least 10 times
  • Are RoHS and REACH compatible

TIMING PULLEY FASTENER SELECTION GUIDE

Fastening Method

A

B

C

D

E

F

G

York Shaft-Saver™

Y

Y

Y

Y

Y

Y

Y

Modified Hubs (Offset screws)

Y

Y

Y

n

Y

n

n

Clamps (Separate Components)

Y

n

n

Y

n

n

Y

Keys

n

n

n

n

n

Y

Y

Pins

n

n

n

n

Y

Y

Y

Cup Point Setscrews

n

Y

n

n

Y

Y

Y

 

  • Legend:
  • A – Shaft remains smooth and unmarked.
  • B – Self-contained solution (no additional components needed).
  • C – Part is fully supported on drive axis with no offset.
  • D – Easy readjustment.
  • E – Pinning is possible if needed.
  • F – Resistant to dirt and debris.
  • G – Holding power not overly sensitive to screw torque.

SHAFT-SAVER™ – GRIPPING TORQUE VALUES

Shaft
Dia.

Material,
steel

Screw
size

Shaft/hub
break-away torque (in/lb)

Standard
Allen
Set Screw (1)

Shaft-Saver
Set Screw (2)

1 scr.

2 scr.

1 scr.

2 scr.

.156

Hardened
and ground

4-40

4

 

3

 

.187

Hardened
and ground

6-32

12

 

10

 

.250

Hardened
and ground

8-32

20

45

20

40

.312

Hardened
and ground

8-32

32

42

30

52

.375

Hardened
and ground

10-32

48

62

44

65

 

.250

Drill
rod

8-32

25

45

32

40

.250

Cold
rolled steel

8-32

20

35

12

22

1) Shafts sustained indentation damage from standard Allen set screws.
2) Shaft-Saver shaft break-away torque exceeds the point where belt slippage occurs.

Test Condition: Maximum
recommended screw torque in an aluminum hub per SAE recommendation, steel
screw, Aluminum 2024 T4 hub, no lubrication

Screw
size

Torque
inch/lb

4-40

3

6-32

6

8-32

11

10-32

20

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York Shaft-Saver™ Timing Pulleys prevent the usual shaft damage caused by set screws, allowing easy replacement or re-adjustment of timing pulleys in the field.

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