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Machine Screw Anchor
Internally threaded anchor designed to make female threads into concrete. It features a soft lead shell on the outside and steel threads on the inside. They are designed for solid concrete but can be installed into hollow block or brick with a special setting tool.
Base Materials: Concrete, Masonry. Solid or Hollow. *Special tool required if used in hollow material*
Other Names: Korker, Caulk In®, Hollow Wall Anchor
Solid Installation: Drill recommended sized hole in base material. Make sure to drill to the proper embedment length. Set the anchor into the hole with the lead portion on top. Use the setting tool and a hammer to drive the lead sleeve over the threads to lock into place.
Hollow Installation: Drill recommended sized hole in base material. Set the anchor into the hole with the lead portion on top. Screw the setting tool into the threads. Hit the setting tool with a hammer to drive the threads up into the lead sleeve.
Drill Bit and Allowable Load Data
| Thread Dia. | Drill Bit | Embed Length | Tension (lbs.) | Shear (lbs.) |
|---|---|---|---|---|
| No. 8 | 5/16 | 1/2 | 90 | 90 |
| No. 10 | 3/8 | 5/8 | 245 | 235 |
| 1/4 | 1/2 | 7/8 | 375 | 355 |
| 5/16 | 5/8 | 1 | 490 | 520 |
| 3/8 | 3/4 | 1 1/4 | 620 | 825 |
| 1/2 | 7/8 | 1 1/2 | 875 | 1135 |
Allowable Load (Safety Factor of 4). Based off 4000 psi Normal Weight Concrete
Powers Spec Sheet