Expansion Shields

Single Expansion Shields

This is an example of a Mechanical Anchor. We carry a variety of conventional drilling and anchoring systems, each of which is different in its method of taking the applied load and transferring it through an anchor to the base material. Each type is designed for a specific application. Among these types are Cast-In-Place, Drilled In, Friction, Clamping, Compression, Undercut and Bonded Anchors.

These heavy duty machine bolt anchors are designed for use in concrete, brick or stone. They are made of a rustproof zinc alloy. As the bolt is tightened, the threaded cone is drawn up into the expansion shield, creating a wedging action. Load capacities up to 3000 PSI in concrete. Stocked in sizes from 1/4" to 3/4".

Group codes Represented: SINGLE
Part# Example: 9685R

Single Expansion Anchors
Bolt Diameter	Recommended Hole Diameter	D	L		Proof Test Load (Ultimate Tensile Strength)
		Minimum Diameter of Shield Body	Minimum Length of Shield Body		Proof Test Load (Ultimate Tensile Strength)
		Minimum Diameter of Shield Body	Short	Regular	In 3000 psi. strength concrete
1/4	1/2	7/16	1 1/4	1 1/2	800
5/16	5/8	1/2	1 3/8	1 5/8	1100
3/8	3/4	11/16	1 1/2	2	1450
1/2	7/8	7/8	2	2 1/2	1850
5/8	1	1	2 1/2	2 3/4	2400
3/4	1 1/4	1 1/8	2 3/4	3 1/4	3000

Double Expansion Shields

These dual expansion machine bolt anchors are particularly suited for materials of questionable strength. They can be used in solid concrete, block, brick, and stone. Made of a rustproof zinc alloy. Stocked in sizes from 1/4" to 3/4". Malleable iron shields available in 7/8" and 1".

Group codes Represented: DOUBLE
Part# Example: 9530R

Double Expansion Anchors
Bolt Diameter	Recommended Hole Diameter	D1	L1	Proof Test Load (Ultimate Tensile Strength)
		Minimum Diameter of Shield Body	Minimum Length of Shield Body	Proof Test Load (Ultimate Tensile Strength)
		Minimum Diameter of Shield Body	Minimum Length of Shield Body	In 3000 psi. strength concrete
1/4	1/2	1/2	1 1/4	1100
5/16	5/8	9/16	1 5/8	1450
3/8	3/4	11/16	2	1750
1/2	7/8	7/8	2 1/4	2200
5/8	1	1	2 3/4	3250
3/4	1 1/4	1 1/8	2 1/4	4600

Alma Bolt Company & Prime Fasteners 1-800-526-2200