Shaft-Saver™ Timing Pulleys

SHAFT SAVER VS STANDARD SET SCREWS

A setscrew 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 setscrew 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
  • Make 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 MethodABCDEFG
York Shaft-Saver™YYYYYYY
Modified Hubs (Offset screws)YYYnYnn
Clamps (Separate Components)YnnYnnY
KeysnnnnnYY
PinsnnnnYYY
Cup Point SetscrewsnYnnYYY
  • 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, steelScrew sizeShaft/hub break-away torque (inch/lb)
Standard Allen
Set Screw (1)
Shaft-Saver
Set Screw (2)
1 scr.2 scr.1 scr.2 scr.
.156Hardened and ground4-4043
.187Hardened and ground6-321210
.250Hardened and ground8-3220452040
.312Hardened and ground8-3232423052
.375Hardened and ground10-3248624465
 
.250Drill rod8-3225453240
.250Cold rolled steel8-3220351222

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 sizeTorque inch/lb
4-403
6-326
8-3211
10-3220