Toro Power Clear 721 - Page 17

SAEGrade8SteelSetScrews
RecommendedTorque
ThreadSize
SquareHeadHexSocket
1/4-20UNC
140±20in-lb73±12in-lb
5/16-18UNC
215±35in-lb145±20in-lb
1/2-13UNC75±15ft-lb50±10ft-lb
3/8-16UNC35±10ft-lb18±3ft-lb
WheelBoltsandLugNuts
ThreadSizeRecommendedTorque**
7/16-20UNFGrade565±10ft-lb
88±14N•m
1/2-20UNFGrade580±10ft-lb
108±14N•m
M12X1.25Class8.880±10ft-lb
108±14N•m
M12X1.5Class8.880±10ft-lb
108±14N•m
**Forsteelwheelsandnon-lubricatedfasteners.
ThreadCuttingScrews(ZincPlatedSteel)
Type1,Type23,orTypeF
ThreadSizeBaselineTorque*
No.6-32UNC
20±5in-lb
No.8-32UNC
30±5in-lb
No.10-24UNC
38±7in-lb
1/4-20UNC
85±15in-lb
5/16-18UNC
110±20in-lb
3/8-16UNC
200±100in-lb
*Holesize,materialstrength,materialthicknessandnishmustbeconsideredwhendetermining
specictorquevalues.Alltorquevaluesarebasedonnon-lubricatedfasteners.
ConversionFactors
in-lbX11.2985=N•cm
ft-lbX1.3558=N•m
N•cmX0.08851=in-lb
N•cmX0.73776=ft-lb
ThreadCuttingScrews(ZincPlatedSteel)
ThreadsperInch
ThreadsSize
TypeATypeB
BaselineTorque*
No.6182020±5in-lb
No.8151830±5in-lb
No.10121638±7in-lb
No.12111485±15in-lb
*Holesize,materialstrength,materialthicknessandnishmustbeconsideredwhendetermining
specictorquevalues.Alltorquevaluesarebasedonnon-lubricatedfasteners.
POWERCLEAR®721/821SnowthrowerServiceManual
Page2–7
SpecicationsandMaintenance:TorqueSpecications
3438-776RevA