Appendix
SP 305
Startup 250:Users:Danny:Desktop:Operation manuals:line pumps:maverick
(P305):Appendix.fm
Operation Manual -
63
Torque Specifications for SAE
Bolts
The following charts show the tightening torques
specified for the bolts used on PH series pumps. The
charts are to be followed unless a different torque
specification is indicated for a particular procedure.
A torque wrench must be calibrated to within 1% of its
indicated value throughout its range. Bolts must be
torqued to within 4% of the requirement if the wrench
has a dial scale. If no dial scale is present, the bolts
must be torqued to within 6% of the requirement. For
example, a bolt to be torqued to a 200 pound
requirement must be within the range of 208–192 foot
pounds for a dial scale torque wrench.
Schwing equipment uses two different types of bolts;
one has a black finish and the other has a dychromate
finish.
Torque specifications are very important for proper
machine function. For more information on this
subject, refer to the section on bolt tightening in the
Maintenance section of this manual.
GENERAL SAE BOLT TORQUE SPECIFICATION TABLE
Use the values listed unless special torques are specified. Values are for UNC and UNF thread fasteners.
Values do not apply if graphite, moly-disulphide or other extreme pressure lubricant is used.
Table 1
SAE Grade
Number
5 8
Bolt head identifi-
cation marks. See
Note below.
Bolt Size lb.-ft N•m lb.-ft N•m
1/4” 9-11 12-15 12-15 16-20
5/16” 17-20.5 23-28 24-29 33-39
3/8” 35-42 48-57 45-54 61-73
7/16” 54-64 73-87 70-84 95-114
1/2” 80-96 109-130 110-132 149-179
9/16” 110-132 149-179 160-192 217-260
5/8” 150-180 203-244 220-264 298-358
3/4” 270-324 366-439 380-456 515-618
7/8” 400-480 542-651 600-720 814-976
1” 580-696 787-944 900-1080 1220-1464
1-1/8” 800-880 1085-1193 1280-1440 1736-1953
1-1/4” 1120-1240 1519-1681 1820-2000 2468-2712
1-3/8” 1460-1680 1980-2278 2380-2720 3227-3688
1-1/2” 1940-2200 2631-2983 3160-3560 4285-4827
NOTE: Bolt head identification marks are shown as per grade. Manufacturer’s marks may vary.
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