Page 55 - banneredThermosealCatalog2010

Page 1 of 3 Torque to Achieve Bolt Utilization 061207
2350 Campbell Road FAX: 937-498-7544 Admin.
Sidney, OH 45365-9573 FAX: 937-498-4911 Sales
Torque to Achieve Bolt Utilization
(Unlubricated Bolts)
Nominal
Diameter
(in.)
SAE J429
Grade 5
(ft-lbf)
SAE J429
Grade 8
(ft-lbf)
ASTM A193
Grade B7
(ft-lbf)
ASTM A193
Grade B8 (304SS)
(ft-lbf)
Yield 50% 70% 50% 70% 50% 70% 50% 70%
1/4 9 12 12 17 10 14 3 4
5/16 17 24 25 34 20 28 6 9
3/8 30 42 42 59 33 47 11 15
7/16 45 65 66 92 53 74 17 23
1/2 75 105 105 145 84 120 27 37
9/16 105 150 150 210 120 165 38 53
5/8 145 205 205 290 165 230 53 74
3/4 255 360 360 505 290 405 92 130
7/8 410 575 575 805 460 645 150 205
1 615 860 860 1205 690 965 220 310
The ability of a gasket material to make and maintain a seal depends not only on the quality of
the gasket material, but also on medium being sealed, the flange design, the amount of
pressure applied to the gasket by the bolts and how the gasket is assembled into the flanges
and tightened.