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It is the North American equivalent of the ISO metric thread system. The UTS serves as the leading standard for bolts, nuts, and a wide variety of other threaded fasteners used in the USA and Canada. However, in recent years the metric thread standard is becoming more common.
Due to many variables that affect the torque-tension relationship like human error, surface texture, and lubrication the only way to determine the correct torque is through experimentation under actual joint and assembly conditions. * SAE J429 grade 5 bolts do not exceed 1-1/2" diameter. * SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter.
UNC threaded fasteners, Screw joint calculator. Tightening torque to preload a bolt: UNC thread : ... Head face friction M WD = F i μ head 1.3 d/2: lb·in: Initial preload F i: lb: Total tightening torque M A = M G + M WD: lb·in 1) the equivalent stress is a result of the stress by tension and torsion.
The standard series consists of three series with graded pitches (coarse UNC, fine UNF, and extra fine UNEF) and eight series with constant pitches (4, 6, 8, 12, 16, 20, 28, and 32 threads per inch). Special Series UNS.
13 Μαΐ 2016 · Grade 8 Tensile Strength: UNC & UNF 1/4" to 1-1/2" 74 MIN KSI. 120 MIN KSI. 150 MIN KSI. Proof Load. Diameter & Thread: Grade 2 Proof Load: Grade 5 Proof Load: Grade 8 Proof Load: 1/4" - 20: 1750 lbs. ... 1/2" - 20: 8800 lbs. 13600 lbs. 19200 lbs. 9/16" - 12: 10000 lbs. 15500 lbs. 21800 lbs. 9/16" - 18: 11200 lbs. 17300 lbs. 24400 lbs. 5/8 ...
1 - 8 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more
1/2 - 20 UNF : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more
