Toro Power Clear 721 - Page 15

StandardTorqueforDry,ZincPlated,andSteelFasteners(InchSeries)
ThreadSizeGrade1,
5,&8
Fasteners
withThin
HeightNuts
SAEGrade1Bolts,Screws,
Studes&Semswith
RegularHeightNuts(SAE
Grade2orBetterNut)
SAEGrade5Bolts,Screws,
Studs&SemswithRegular
HeightNuts(SAEGrade
5orBetterNut)
SAEGrade8Bolts,Screws,
Studs&SemswithRegular
HeightNuts(SAEGrade
8orBetterNut)
in-lbin-lbN•cmin-lbN•cmin-lbN•cm
#6-32UNC
15±2169±2323±3260±34
#6-40UNF
10±213±2147±23
17±2192±2325±3282±34
#8-32UNC
29±3328±3441±5463±56
#8-36UNF
13±225±5282±30
31±4350±4543±5486±56
#10-24UNC
42±5475±5660±6678±68
#10-32UNF
18±230±5339±56
48±5542±5668±7768±79
1/4-20UNC
48±753±7599±79100±101130±113140±151582±169
1/4-28UNF
53±765±10734±113115±121299±136160±171808±192
5/16-18UNC
115±15105±151186±169200±252260±282300±303390±339
5/16-24UNF
138±17128±171446±192225±252542±282325±333672±373
ft-lbft-lb
N•m
ft-lb
N•m
ft-lb
N•m
3/8-16UNC
16±216±222±330±341±443±558±7
3/8-24UNF
17±218±224±335±447±550±668±8
7/16-14UNC
27±327±337±450±568±770±795±9
7/16-20UNF
29±329±339±455±675±877±8104±11
1/2-13UNC
30±348±765±975±8102±11105±11142±15
1/2-20UNF
32±453±772±985±9115±12120±12163±16
5/8-11UNC
65±1088±12119±16150±15203±20210±21285±28
5/8-18UNF
75±1095±15129±20170±18230±24240±24325±33
3/4-10UNC
93±12140±20190±27265±27359±37375±38508±52
3/4-16UNF
115±15165±25224±34300±30407±41420±43569±58
7/8-9UNC
140±20225±25305±34430±45583±61600±60813±81
7/8-14UNF
155±25260±30353±41475±48644±65667±66904±89
Note:Reducetorquevalueslistedinthetableaboveby25%forlubricatedfasteners.Lubricated
fastenersaredenedasthreadscoatedwithalubricantsuchasoil,graphite,orthreadsealantsuch
asLoctite.
Torquevaluesmyhavetobereducedwheninstallingfastenersintothreadedaluminumorbrass.The
specictorquevalueshouldbedeterminedbasedonthefastenersize,thealuminumorbasematerial
strength,lengthofthreadengagement,etc.
ThenominaltorquevalueslistedaboveforGrade5and8fastenersarebasedon75%oftheminimum
proofloadspeciedinSAEJ429.Thetoleranceisapproximately±10%ofthenominaltorquevalue.
Thinnutsincludejamnuts.
POWERCLEAR®721/821SnowthrowerServiceManual
Page2–5
SpecicationsandMaintenance:TorqueSpecications
3438-776RevA