Fisher Fisher Body-to-Bonnet Torque Values for Hot-Dipped Galvanized Fasteners Manuals & Guides

Installation Instructions

D103559X012

Hot-Dipped Galvanized Fastener Torque

July 2012

Fisherr Body-to-Bonnet Torque Values for
Hot-Dipped Galvanized Fasteners

Fastening hot-dipped galvanized (HDG) studs and nuts needs to be done with extreme caution. The amount of torque
needed to apply the correct force between the body and bonnet is approximately 75% of what is needed for lubricated
fasteners. Tables 1 and 2 give the torque values for HDG body-to-bonnet bolting.

Bolt Torque Values for Bolt Materials with Yield Strength 6895
bar (100,000 psi) and Above

Bolt Materials:
SA 193-B7, SA 564-630 (H1150), SA 193-B16, SA 564-630 (H1150 DBL and FGS 20B7),
SA 354-BD, SA 193-B8 Class 2 sizes up thru 3/4 inch, SA 564-630 (H1100) SA 637 (N07718)

Table 1. Bolt Torque Values for Bolt Materials with Yield Strength 100,000 psi and Above

BOLT TORQUE NOMINAL VALUES

Studs with Heavy Hex Nuts

Bolt Size

1/4 - 20 8.54 6.3 8.13 6.0

5/16 - 18 17.1 12.6 15.9 11.7

3/8 - 16 29.7 21.9 27.9 20.6

7/16 - 14 47.5 35 44.7 33

1/2 - 13 67.8 50 65.1 48

9/16 - 12 90.8 67 86.8 64

5/8 - 11 119 88 114 84
3/4 - 10 190 140 183 135

7/8 - 9 281 207 273 201 +15% / -10%

1-8 392 289 382 282
11/8-8 533 393 522 385
11/4-8 705 520 687 507
13/8-8 937 691 919 678
11/2-8 1224 903 1204 888
15/8-8 1566 1155 1542 1137
13/4-8 1966 1450 1936 1428
17/8-8 2428 1791 2394 1766

2-8 2957 2181 2919 2153
21/4-8 4236 3124 4185 3087
21/2-8 5837 4305 5773 4258

3-8 10151 7487 10059 7419

Heavy Hex Head Cap Screws

FFS3A19 FFS3A19

NSm LbfSft NSm LbfSft

Studs with Standard Hex Nuts

Standard Hex Head Cap Screws

Tolerances

±15%

+15% / -5%

www.Fisher.com

Hot-Dipped Galvanized Fastener Torque

July 2012

Installation Instructions

D103559X012

Bolt Torque Values for Bolt Materials with Yield Strength from
80,000 to 92,000 psi

Bolt Materials:
SA 449 (Grade 5) sizes above 1 inch thru 1-1/2 inch, SA 193-B7M, SA 320-L7M, SA 453-660 A and B,
SA 193-B8 Class 2 sizes above 3/4 inch thru 1 inch. SA 193-B8M Class 2 sizes above 3/4 inch thru 1 inch

Table2.BoltTorqueValuesforBoltMaterials with Yield Strength from 80,000 to 92,000 psi

BOLT TORQUE NOMINAL VALUES

Studs with Heavy Hex Nuts

Bolt Size

1/4 - 20 7.59 5.6 7.19 5.3

5/16 - 18 15.6 11.5 14.5 10.7

3/8 - 16 27.5 20.3 25.9 19.1

7/16 - 14 43.4 32 42.0 31

1/2 - 13 66.4 49 63.7 47

9/16 - 12 96.3 71 86.8 64

5/8 - 11 119 88 114 84
3/4 - 10 190 140 183 135

7/8 - 9 281 207 301 222 +10% / -15%

Heavy Hex Head Cap Screws

FFS3A19 FFS3A19

NSm LbfSft NSm LbfSft

Studs with Standard Hex Nuts

Standard Hex Head Cap Screws

Tolerances

+5% / -15%

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2

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