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How to Use Concrete Lag Shield Anchors

How to Use Concrete Lag Shield Anchors

How to Use Concrete Lag Shield Anchors


  1. Using a hammer drill and a carbide-tipped masonry bit, drill a hole of recommended diameter into the base material. The hole depth should be equal to the length of the lag shield anchor plus one half inch (1/2") or more.
  2. Clear the hole of all debris.
  3. Place the lag shield anchor, ribbed end first, into the hole. Tap the lag shield with a hammer until it is flush with the surface of the base material.
  4. Position the fixture to be fastened over the shield in the base material, insert the lag bolt through the fixture and into the shield, and tighten.

NOTE: 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.

Screw Length

The length of the lag screw required is equal to the thickness of the material to be fastened, plus the length of the lag shield, plus 1/2".

Anchor Spacing

The forces on a Lag Shield anchor are transferred to the base material in which it is installed. If the anchors are installed too close together, it can cause an interaction of the forces, thus reducing the holding power of the anchors. 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.

Technical Data

Anchor SizeHole SizeAnchor LengthPull Out
1/4" Short1/2"1"550 lb.
5/16" Short1/2"1 1/4"968 lb.
3/8" Short5/8"1 3/4"1408 lb.
1/2" Short3/4"2"2728 lb.
5/8" Short7/8"2"2816 lb.
3/4" Short1"2"3608 lb.
1/4" Long1/2"1 1/2"682 lb.
5/16" Long1/2"1 3/4"1364 lb.
3/8" Long5/8"2 7/16"2420 lb.
1/2" Long3/4"3 1/2"3674 lb.
5/8" Long7/8"3 1/2"3806 lb.
3/4" Long1"3 1/2"4444 lb

NOTE: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.

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