Double Expansion Anchors 1/4-20

1/4-20 Double Expansion Anchors

• 1/2" Recommended Hole Diameter
• 1/2" Minimum Diameter of Shield Body
• 1 1/4" Minimum Length of Shield Body
• 1100 Proof Test Load (Ultimate Tensile Strength) in 3000 PSI. Strength Concrete
• FF-S-325, Group II Type 2, Class 2
  

Description
This anchor consists of three parts-- (A) a two-piece expansion shield held together by a steel band or wire, or interlocked by ears and lugs; and (B) an expander nut. The outer surface of the shield is designed with ribs or corrugations to resist turning. The nut is either conical or eliptical in shape so as to fit within the shield body

Applications/ Advantages
Used in soft masonry with machine screws or machine bolts which are exposed to vibration or side pressure. The expander nut climbs the anchor bolt as it is tightened, expanding the shield body. The bolt can be removed and replaced without affecting the holding power of the anchor system. Can also be used in harder materials, including stone, brick or concrete

Material
Expansion shield and nut may be made of alloy zinc, brass, malleable iron or steel

Anchor Spacing
Anchors should be installed a minimum of ten anchor diameters between each other and a minimum of five anchor diameters from the edge

Depth of Hole
Should be equal to or slightly longer than the length of the anchor

Tensile Strength
Expansion anchors shall not be removable or show evidence of failure when subjected to axially applied proof test loads as specified in the above table when set in concrete of 3000 psi. compressive strength.The suggested safe working load is one-fourth the average proof test loads shown in the above table

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