Inch Torque Reference - Grade 2 / 5 / 8

Printable shop wall chart: Inch Torque Reference - Grade 2 / 5 / 8. Free letter-size PDF to print and post at the counter; 25 x 36 inch poster version available.

Last reviewed 2026-09-10 · reference FG-FB2D00 · Report an error on this sheet

Before you use a torque value: these are starting estimates for general bolting. Do not use them for pretensioned or slip-critical structural joints (ASTM F3125 A325/A490 under RCSC) — those are installed by turn-of-nut, calibrated wrench, twist-off or DTI methods. Lubrication changes the answer: a dry value applied to a lubricated or plated bolt can yield or break it. The manufacturer’s or engineer’s value always governs.

Size-TPI	Grade 2	Grade 5	Grade 8	Grade 5 lubricated (K 0.15)	Grade 8 lubricated (K 0.15)
1/4-20	5	8	12	6	9
5/16-18	11	17	25	13	18
3/8-16	20	31	44	23	33
7/16-14	32	49	70	37	52
1/2-13	49	75	105	57	80
9/16-12	70	110	155	82	115
5/8-11	97	150	210	115	160
3/4-10	170	265	375	200	280
7/8-9	165	430	605	320	455
1-8	250	645	910	485	680
1-1/8-7	355	795	1,290	595	965
1-1/4-7	500	1,120	1,815	840	1,365
1-3/8-6	655	1,470	2,380	1,100	1,785
1-1/2-6	870	1,950	3,160	1,460	2,370

T = K x D x F, F = 0.75 x SAE J429 proof load. Starting estimates only: OEM or engineer torque always governs. Not for structural bolts (A325/A490), which follow RCSC pretension methods.

These tables carry the same figures as the printed sheet below.

The printed sheet

25 x 36 inch poster version

For the full-size shop poster, tell us where to send it.

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Text version of this sheet

GRADE 2

GRADE 5

GRADE 8

Estimated assembly torque, lb-ft · UNC coarse thread · K = 0.20 dry · clamp load = 75% of proof

Size-TPI

Grade 2

Grade 5

Grade 8

Grade 5 lubricated (K 0.15)

Grade 8 lubricated (K 0.15)

1/4-20

5/16-18

3/8-16

7/16-14

1/2-13

105

9/16-12

110

155

115

5/8-11

150

210

115

160

3/4-10

170

265

375

200

280

7/8-9

165

430

605

320

455

1-8

250

645

910

485

680

1-1/8-7

355

795

1,290

595

965

1-1/4-7

500

1,120

1,815

840

1,365

1-3/8-6

655

1,470

2,380

1,100

1,785

1-1/2-6

870

1,950

3,160

1,460

2,370

T = K x D x F, F = 0.75 x SAE J429 proof load. Starting estimates only: OEM or engineer torque always governs. Not for structural bolts (A325/A490), which follow RCSC pretension methods.

The Fastener App | TheFastenerApp.com

Fastener Guide reference FG-FB2D00 · thefastenerapp.com/fastener-guide/wall-charts/inch-torque-reference-grade-2-5-8 · © The Fastener App. Reference only — verify the current governing standard, drawing and manufacturer data before specifying or installing.

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Customer	Hours a month	Hours a week
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Talleyrand Signs LLC	13.9	3.2
Mayport Tool & Die Inc.	13.5	3.1
Eagle Mechanical LLC	12.5	2.9
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Tallahassee Packaging LLC	6.4	1.5
Coastal Maintenance Group	5.7	1.3
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