ERECTION AND SAFETY MANUAL - Rigid Global Buildings

Page 7.1-26
Revision: 2
August 2011
W
A 325
BOLT SIZE
(INCHES)
1/2
5/8
3/4
7/8
JOINTS NOT SUBJECT TO TENSION LOADS
BOLT TIGHTENING PROCEDURES
ERECTION AND SAFETY MANUAL
JOINTS NOT SUBJECT TO TENSION LOADS need only be tightened to the snug tight condition, defi ned
as the tightness attained by a few impacts of an impact wrench or the full effort of a man using an ordinary
spud wrench.
JOINTS SUBJECT TO TENSION LOADS
1
1 1/4
W
(INCHES)
7/8
1 1/16
1 1/4
1 7/16
1 5/8
2
A325 BOLTS
SPECIFIED
MINIMUM FASTENER
TENSION KIPS
(1000 LBS)
SPECIFIED NUT
ROTATION
BOLT LENGTH
4 DIAMETER
Two tightening procedures are specifi ed for A325 bolts in joints subject to tension loads, Turn-of-the-nut
method and direct tension indicator.
Turn-of-the-nut method - When turn-of-the-nut method is used to provide tension, fi rst bring enough bolts
to a “snug tight” condition to insure that the parts of the joints are brought into good contact with each
other. Next, place bolts in all remaining bolt holes and bring to unsnug tight”. Then additionally tighten
all bolts per the above table - progressing from the bolts nearest the web, to the free edges. During this
operation there shall be no rotation of the part not turned by the wrench.
Tightening by use of a direct tension indicator - Tightening by this means is permitted provided it can
be demonstrated, by an accurate direct measurement procedure, that the bolts have been tightened to
specifi ed tension.
Consult latest edition of the AlSC Manual of Steel Construction for more complete instructions for installing
high strength bolts.
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19
28 1/3 TURN 1/2 TURN
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51
71
Technical information contained herein is subject to change without notice.