Page 8 of Concrete Fasteners Catalog by Concrete Fastening Systems

6 p 888.498.5747 f 216.391.5352 www.confast.com LEADWOOD SCREW ANCHOR The cavity of the Leadwood screw anchor tapers and is designed to facilitate proper expansion in masonry. The anchor is split from the bottom up for most of its length and has longitudinal ribs for a portion of its length. The top end of the anchor tapers outward from the anchor diameter into a tubular thin section cone. The tapered diameter at the outer end of the anchor, in combination with the longitudinal split, facilitates ease of initial expansion and prevents the anchor from turning in the masonry. As the screw progresses deeper into the anchor, the longitudinal ribs bite into the masonry, preventing the anchor from twisting and allowing the screw to form its own threads. TECHNICAL INFO Approvals: Meets G.S.A. Specification F-S-325, Group IV, Type 1. Applications: Light duty into concrete, block and brick. Installation: (1) Drill hole into the base material (see chart below for recommended hole size) to a depth equal to the anchor length, plus one-quarter inch (1/4") or more. (2) Clean out hole of all dust and cuttings. (3) Place anchor into hole and with light hammer blows, tap anchor flush with surface of base material. (4) Insert screw through fixture into anchor and tighten. Screw Length: Thickness of material to be fastened plus anchor length plus 1/4" for complete expansion of anchor equals screw length. Anchor Spacing: The forces on a Leadwood screw 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. ANCHOR SIZE HOLE SIZE SCREW SIZE PULL-OUT 3000 PSI CONCRETE 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. TECHNICAL DATA 6-8 x 3/4" 1/4" 1/8" 3/16" 174 lb. 6-8 x 1" 1/4" 1/8" 3/16" 316 lb. 1/4" 6-8 x 1-1/2" 1/4" 1/8" 3/16" 168 lb. 10-14 x 1" 5/16" 3/16" 1/4" 720 lb. 10-14 x 1-1/2" 5/16" 3/16" 1/4" 720 lb. 16-18 x 1" 3/8" 5/16" 690 lb. 16-18 x 1-1/2 3/8" 5/16" 1617 lb.

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