Technical Specifications for Lag Shield Anchors

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Technical Specifications

There are numerous technical specifications that must be considered when using Lag Shield Anchors, including diameter, internal thread length, minimum embedment and required hole size. The Lag Shield Anchor is a great fastener when very hard (short) concrete or lower grade (long) concrete is a concern. The size of the anchor refers to the diameter of the lag bolt to be used with this fastener. Once all these factors have been determined, you can find the expected holding values in the technical information below.

Length:
To determine the length required, add the thickness of the material to be fastened, plus the lag shield anchor length, plus an additional half an inch. NOTE: The tip of the screw must protrude from the bottom of the lag shield anchor to insure proper expansion.

Spacing:
The forces on a Lag Shield Anchor are transferred to the 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. As a rule of thumb, the expansion anchor 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 conditions, the spacing should be increased.

Short lag shield anchor
Ultimate Holding Values – CONCRETE**

Bolt Size (Inches) Anchor Length (Inches) Hole Size (Inches) 3000 PSI Concrete
Tension (lbs.)
Item Number Box Quantity
1/4 1 1/2 1000 LSS14 100
5/16 1-1/4 1/2 2000 LSS516 100
3/8 1-3/4 5/8 3300 LSS38 50
1/2 2 3/4 5500 LSS12 25
5/8 2 7/8 6500 LSS58 25
3/4 2 1 7000 LSS34 25

Long lag shield anchor
Ultimate Holding Values – CONCRETE**

Bolt Size (Inches) Anchor Length (Inches) Hole Size (Inches) 3000 PSI Concrete
Tension (lbs.)
Item Number Box Quantity
1/4 1-1/2 1/2 1250 LSL14 100
5/16 1-3/4 1/2 2500 LSL516 100
3/8 2-1/2 5/8 4100 LSL38 50
1/2 3 3/4 6800 LSL12 25
5/8 3 7/8 7000 LSL58 25
3/4 3 1 7500 LSL34 25

*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. All values are based on close-tolerance holes drilled with carbide tipped drill bits. Designated holding power depends on the quality of the masonry material, depth of embedment, and proper hole size.