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Troubleshooting Single Expansion

Troubleshooting Single Expansion

Purchase Single Expansion Anchors

Problem: Trying to determine which end of the single expansion anchor is inserted into the hole first.

Trouble Shooting Tips:

  1. Make sure that the threaded expansion nut is inserted into the hole first, with the open end of the single expansion anchor flush with the surface of the base material.

Problem: When turning the bolt the single expansion anchor spins in the hole.

Trouble Shooting Tips:

  1. Make sure the correct diameter hole has been drilled.  Each diameter of single expansion anchor requires a different diameter of the hole.  The hole diameter is equal to the outside diameter of the single expansion anchor.

Anchor Diameter

Hole Diameter

1/4” 1/2”
5/16” 5/8”
3/8” 5/8”
1/2” 7/8”
5/8” 1”
3/4” 1-1/4”
  1. Use a hammer drill with the hammer drill switched to the hammer and rotation mode.
  2. The carbide tipped bit used must meet ANSI standards, this will ensure proper tolerance between the hole size and anchor size.
  3. Clean the hole of all dust and debris before inserting the single expansion anchor.  A wire brush the same diameter, as the hole and a vacuum, will ensure the hole is clean.

Problem: Getting the single expansion anchor to be flush with the surface of the base material.

Trouble Shooting Tips:

  1. The depth of the hole for the single expansion anchor is equal to the length of the anchor being installed.
  2. To ensure proper and consistent depth of the hole in the base material use the depth gauge provided with the hammer drill.  If a depth gauge is not available use tape to mark on the bit the required drilling depth.
  3. When setting the depth gauge or placing the tape, make sure that the drill bit is in the most protracted position in the chuck.
  4. Measure the depth on the bit from the squared off part not from the tip.

measure from here image

  1. Drill the hole slightly deeper to allow space for any debris to fall into and out of the way.

Problem: Single expansion anchor is not grabbing and does not have much holding strength.

Trouble Shooting Tips:

  1. The base material must be solid where the expansion nut expands the body of the single expansion anchor against the base material.
  • If the base material has hollow areas the single expansion anchor may not work properly.