Us Bolts Torques

Reference data and engineering information about us bolts torques for mechanics applications.

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Overview

Engineering reference data for Us Bolts Torques in mechanics.

Key Formulas

Newton's Second Law

$F = ma$

Force = mass × acceleration.

Work

$W = Fd\cos\theta$

Work = force × displacement × cos(angle).

Kinetic Energy

$E_k = \frac{1}{2}mv^2$

Energy of motion.

Potential Energy

$E_p = mgh$

Gravitational potential energy.

Variables

Symbol	Description	Unit
$F$	Force	N
$m$	Mass	kg
$a$	Acceleration	m/s²
$v$	Velocity	m/s

Tightening Torques for US Bolts (Imperial)

10 rows

Recommended tightening torques for imperial US bolts at approximately 70% of yield strength (lubricated).
Size(in)	SAE Grade 2 - Coarse(lbf ft)	SAE Grade 2 - Fine(lbf ft)	SAE Grade 5 - Coarse(lbf ft)	SAE Grade 5 - Fine(lbf ft)	SAE Grade 8 - Coarse(lbf ft)	SAE Grade 8 - Fine(lbf ft)	18-8 S/S - Coarse(lbf ft)	18-8 S/S - Fine(lbf ft)
1/4	4	4.7	6.3	7.3	9	10	6.3	7.8
5/16	8	9	13	14	18	20	11	11.8
3/8	15	17	23	26	33	37	20	22
7/16	24	27	37	41	52	58	31	33
1/2	37	41	57	64	80	90	43	45
9/16	53	59	82	91	115	129	57	63
5/8	73	83	112	128	159	180	93	104
3/4	115	138	200	223	282	315	128	124
7/8	129	144	322	355	454	501	194	193
1	188	210	483	541	682	764	287	289

Source: engineeringtoolbox.com

Important Notes:

Values in the table are for slightly lubricated bolts.
For dry bolts, increase the torque values by approximately 30%.
Bolt size conversion: 1 inch = 25.4 mm
SAE stands for Society of Automotive Engineers.
S/S stands for Stainless Steel (18-8 refers to 304 stainless steel).

Interactive Charts

US bolts - tightening torques

References

Original Source

Source: engineeringtoolbox.com