Civil Engineering Reference
In-Depth Information
Ta ble 1-14
Allowable Carrying Loads for Anchor Bolts
Allowable Load
1
/
2
-inch
5
/
8
-inch
Type Fastener
Size
Wallboard
Wallboard
Hollow wall screw
anchors
1
/
8
-inch dia. short
50 lbs
—
3
/
16
-inch dia. short
65 lbs
—
1
/
4
-inch,
5
/
16
-inch,
65 lbs
—
3
/
8
-inch
dia. short
—
90 lbs
3
/
16
-inch dia. long
—
95 lbs
1
/
4
-inch,
5
/
16
-inch,
3
/
8
-inch
dia. long
Common toggle
bolts
1
/
8
-inch dia.
50 lbs
90 lbs
3
/
16
-inch dia.
60 lbs
120 lbs
1
/
4
-inch,
5
/
16
-inch,
80 lbs
120 lbs
3
/
8
-inch dia.
(Courtesy National Gypsum Co.)
(depending on the weight of the object to be anchored) is inserted.
This is so that its length is inside the wall and its flange rests against
the wall's surface. The anchor is then lightly tapped with the butt of
a screwdriver to seat it and prevent it from turning in the hole. The
screw is then turned clockwise with a screwdriver.
As the screw is turned, it draws the collar end of the anchor
toward the flange end. Four slots cut lengthwise into the tube al-
low the sections of the tube between the slots to bend outward in
response to pressure from the collar until they lie flat against the
inside surface of the wall, drawing the flange tightly against the out-
side surface and locking the anchor securely in place. The screw is
then removed, inserted through whatever object is to be fastened,
and replaced in the anchor body, an action that can be performed
repeatedly without loosening the anchor body.
Hollow wall screw anchors are also manufactured with pointed
screws and tapered threaded collars. These can be driven into the
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