Inch torque chart (SAE J429)

99 sizes · ThreadRef · sample of the first 8 rows

Inch torque chart (SAE J429). Target preload and estimated tightening torque for SAE grades 2, 5 and 8 across the Unified series - including the numbered sizes and the diameters above 1-1/2 inch, which J429 does not grade and which are marked as undefined here.
Size	Stress area in²	Gr 2 preload lbf	Gr 2 torque lb·ft	Gr 5 preload lbf	Gr 5 torque lb·ft	Gr 8 preload lbf	Gr 8 torque lb·ft
UNC - Unified coarse
#1-64 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#2-56 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#3-48 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#4-40 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#5-40 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#6-32 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#8-32 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined
#10-24 UNC¹	not defined	not defined	not defined	not defined	not defined	not defined	not defined

Proof loads per SAE J429, which steps down with diameter. Preload is 75% of proof load; torque is the T = K · F · d estimate at K = 0.20 (dry / as-received steel).

Torque figures are estimates that depend on the stated nut-factor assumption. Verify against your fastener manufacturer's data and joint requirements before assembly.

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