HE Internally Threaded Anchor

HE Internally Threaded Anchor

European-approved (ETA) internally threaded drop-in anchor — a flush female thread in concrete for cracked and non-cracked concrete, dynamic loads and sprinkler systems.

ETA — Cracked concreteDynamic loadsFire ratingSprinklers — CSICSteel or SS316

The Adit internally threaded anchor family

Choose the right internally threaded (female) anchor for your ceiling type and application.

HEFemale anchor · internal thread HE-HCFemale anchor · hollow-core

Technical specification

PropertyHE — internally threaded drop-in anchor, European approval
PropertiesInternally threaded anchor, with or without collar
MaterialSteel or SS316 stainless steel
TechnologyInternally threaded drop-in anchor (expanded with a dedicated setting tool)
Cracked concreteYes
Dynamic loadsYes
Fire ratingYes
Sprinklers (fire suppression)Yes — CSIC certificate
Spancrete / hollow-core slabHE-HC version only (HE-HC)
StandardsEuropean Technical Assessment ETA 14-0068 · ETA 14-0135

4 versions in the HE series

VersionDescription
HE-HOWithout collar — standard anchoring in solid concrete
HE-CLWith collar — helps with fixing and depth identification
HE-HCAlso for Spancrete (hollow-core slab) — see HE-HC product page
HE-NSHot-dip galvanized — outdoor, humid and coastal environments

Downloads

Instructional & field videos

Internally threaded anchor: the complete guide

An internally threaded anchor is a drop-in anchor with an internal thread: you drill a hole, insert the anchor, and expand it with a dedicated setting tool. Once installed, a flush internal (female) thread remains in the ceiling or wall, into which a threaded rod, hook or any other element is screwed.

The advantage: the anchor stays flush with the concrete surface with no protrusion, and the suspended element is installed after anchoring — and can be replaced without touching the anchor. Ideal for overhead suspension, piping, sprinklers and hangers.

Which version to choose?

Your needVersion
Standard anchoring in solid concreteHE-HO (without collar)
A collar is required for fixing and depth identificationHE-CL (with collar)
Spancrete / hollow-core slab / prestressed concrete ceilingHE-HC
Outdoor, humid or coastal environmentHE-NS (hot-dip galvanized)
Especially aggressive environmentSS316 stainless steel

Applications

  • Pipe and duct suspension: a threaded rod is screwed directly into the anchor — water, electrical and HVAC.
  • Fire suppression systems: sprinkler anchoring backed by a CSIC certificate.
  • Dynamic loads: approved for both static and dynamic loads.
  • Flush head in the ceiling: the anchor stays flush with the concrete surface — no protrusion.
  • Hangers and rails: elements that will be replaced in the future, with no need to touch the anchoring.
  • Cracked concrete: explicit ETA approval for use in cracked concrete.

Frequently asked questions

What is the difference between HE-HO and HE-CL?
The difference is the collar. HE-HO comes without a collar, while HE-CL has a collar that helps with fixing and identifying the installation depth. In terms of performance and approvals — they are identical.
Is the HE anchor suitable for a Spancrete (hollow-core slab) ceiling?
Only in the HE-HC version, which is specially designed for Spancrete ceilings, hollow-core concrete and prestressed concrete. The other versions in the series are not approved for ceilings of this type.
What is the difference between the HE internally threaded anchor and the TFF internally threaded concrete screw?
HE is a drop-in anchor: the sleeve stays permanently in the concrete after installation, and only the male screw inserted into it can be removed and replaced. TFF is a directly threaded concrete screw: it cuts a thread into the concrete and can be fully removed and reused.
Can the suspended element be replaced?
Yes. This is the main advantage of the internally threaded anchor — the element is screwed into the internal thread and can be removed and replaced without touching the anchor itself.
Which version is suitable for an outdoor environment?
HE-NS comes hot-dip galvanized, suitable for outdoor, humid and coastal environments. For especially aggressive environments there is also an SS316 stainless steel version.

Planning a suspension system? Tell us about the ceiling type, the load and the number of suspension points — our engineers will recommend the right version and size.

Talk to our engineers