The Current Word on Concrete Anchors

By Michael Patino on 2009-08-21 12:54:58 -

reprinted by permission from LA Chapter Material Handling & Management Society Aug 2009

Anchors Revisited

As most of us are aware by now, all anchors that are to resist seismic forces, must be installed under the supervision of a deputy inspector.

The code change has allowed the "Periodic" in lieu of "Continuous" inspection.

Definition of the periodic supervision is up to the deputy inspector. However, the inspector should check the brand of anchor, observe how the holes are drilled (and cleaned) and observe some anchors being installed. He then returns, depending on the project size, and verifies the torque of the installed anchors.

The currently approved anchors in seismic areas are:


  • Kwik Bolt TZ (ESR-1917); Expansion anchor (3/8" – ¾")
  • HDA (ESR-1546); Undercut anchor (10mm-20mm)
  • HSL-3 (ESR-1545); Metric Sleeve Anchor (8mm-24mm)

ITW (REDHEAD) ANCHORS Updated 4-11-2011

  • TRUBOLT+ Expansion Anchor, ESR-2427 Report, (3/8 -3/4)
  • 3/8 and 1/2 anchors require 4" minimum slab
  • 5/8 anchors require 6" minimum slab
  • 3/4 anchors require 7" minimum slab


  • Power Stud SD1 (ESR-2818); Expansion Anchor (3/8"-5/8")
  • Power Stud SD2 (ESR-2502); Expansion Anchor (3/8" – ¾")
  • Wedge Bolt (ESR-2526); Concrete Screw (3/8"- ¾")


  • Strong Bolt (ESR-1771); Expansion Anchor (1/2" –1")
  • Titen HD (ESR-2713); Concrete Screw (3/8" –3/4")

All anchors must be installed under the periodic supervision of a deputy inspector, typically hired and paid by the owner, through a testing agency.

All submittals to the city must have the anchors selected and their capacity calculated. No more "Or approved equal", as each manufacturer has different approval criteria.

Testing of anchors installed, without a deputy inspector present, MAY be allowed, provided the engineer of record writes a proposal to be approved by the building official. Know the rules!


      Thanks to Sal Fateen, Seizmic Engineering and LAMHMS