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List of symbols, units and abbreviations

MarkDimensionUnit
tTemperature°C
pPressurePa
HBHardness by Brinella 
HRA, HRB, HRCHardness by Rockwella 
HVHardness by Vickerse 
 TorqueNm
 Recommended torqueNm
RStrengthN/mm²
RmTensile strengthN/mm²
 Limit of tensile of strengthN/mm²
RpTensile slideN/mm²
 Limit of tensile slideN/mm²
SpTest stressN/mm²
ReLimit of flexibilityN/mm²
AlExtension to break%
MarkDimensionUnit
d1Diameter of threadmm
d2Diameter of headmm
fHeight of rounding (for raised countersunk head)mm
LLength of screwmm
bLength of thread without shaftmm
kLenght of headmm
mDiameter of hexagonal - bigger (for internal hexagonal, screws and nuts)mm
sDiameter of hexagonal - smaller (for internal hexagonal, screws and nuts)mm
nDiameter of pozidrive and slotted groovemm
tDepth of groovemm
PLead of threadmm

 

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