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Technical Information:
This
two-part expansion shield is preassembled into a self-contained
single unit. The shell-like unit has tapered internal threads
for a portion of its length. The outside of the anchor has a
series of circumferential ribs starting at the bottom and running
for a major portion of its length. The back end of the anchor
has two equally spaced ribs that protrude beyond its diameter
and run for a portion of its length. Precision internal threads
permit easy turning of the lag screw without lubrication. Once
fastened, an object may be easily unbolted and removed. All
parts of the completed unit are made of zinc alloy commonly
known as Zamak 5, a rust-proof material. The anchor comes in
two lengths, short or long. The short lag shield is for anchoring
in high grade concrete or where thickness of base material prohibits
the use of a longer length shield. The long Lag shield is for
use in lower grade base material or where extra anchoring strength
is required.
Lag Shield Anchor concrete anchor/fastener -
Approvals:
Meets G.S.A. Specification FF-S-325, Group II, Type 1, Class
1 & 2. Zamak #5 Zinc Alloy meets the A.S.T.M. specification
XXV (AC41A) and S.A.E. 925.
Lag Shield Anchor concrete anchor/fastener -
Applications:
Light to medium duty into concrete, block and brick.
Lag Shield Anchor concrete anchor/fastener -
Installation:
(1) Drill hole of recommended diameter, into the base material
equal to the length of the expansion anchor plus one half
inch (1/2") or more. (2) Clean the hole of all dust and
cuttings. (3) Place the expansion anchor, ribbed end first,
into hole. Tap with a hammer until flush with the surface
of base material. (4) Position the material to be fastened
over the shield in the base material and screw in the lag
screw. (5) If the lag screw begins to torque-up or tighten
before the head of the lag screw mates up against the object
being fastened, the shield should be driven deeper into the
hole by hand hammering the head of the lag screw until flush
to the object being fastened. Re-tighten the lag screw to
complete the expansion of the shield and to secure the material
being fastened.
Lag Shield Anchor concrete anchor/fastener -
Screw Length:
Thickness of material to be fastened plus Lag
Shield length plus 1/2" equals Lag Screw length.
Lag Shield Anchor concrete anchor/fastener -
Anchor Spacing:
The forces on a Lag Shield anchor are transferred
to the material that it is installed in. If the anchors are
installed too close together, it can cause an interaction
of the forces, thus reducing the holding power of the anchor.
As a rule of thumb, the expansion industry has established
a minimum standard of ten (10) anchor diameters for spacing
between anchors and five (5) anchor diameters from an unsupported
edge. When vibration or sudden impact are part of the load
condition anchor spacing should be increased.
Lag Shield Anchor concrete anchor/fastener -
Technical Data
| Anchor Size |
Hole Size |
Anchor Length |
Pull-Out 6000 psi Concrete |
| 1/4" Short |
1/2" |
1" |
400
lb. |
| 5/16" Short |
1/2" |
1-1/4" |
800
lb. |
| 3/8" Short |
5/8" |
1-3/4" |
1300
lb. |
| 1/2" Short |
3/4" |
2" |
2100
lb. |
| 5/8" Short |
7/8" |
2" |
3400
lb. |
| 3/4" Short |
1" |
2" |
5000
lb. |
| 1/4" Long |
1/2" |
1-1/2" |
500
lb. |
| 5/16" Long |
1/2" |
1-3/4" |
1000
lb. |
| 3/8" Long |
5/8" |
2-7/16" |
1600
lb. |
| 1/2" Long |
3/4" |
3-1/2" |
2800
lb. |
| 5/8" Long |
7/8" |
3-1/2" |
4400
lb. |
| 3/4" Long |
1" |
3-1/2" |
6500
lb. |
Values shown are average ultimate values and are offered only
as a guide and are not guaranteed. A safety factor of 4:1 or
25% is generally accepted as a safe working load. Reference
should be made to applicable codes for the specific working
ratio. Minimum embedment for satisfactory anchor performance
is 4-1/2 bolt diameters. Deeper embedments will yield higher
tension and shear capacity.
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