Vibration Isolation Hangers

Hangers that keep suspended equipment, ductwork and pipework from passing vibration into the slab above. Spring for low-frequency vibration, rubber for high-frequency noise, combined where you need both. We select the hanger by load and frequency, not by catalogue page.

See the range

Insulated pipework on red steel trapezes, each hung from the slab on four housed spring hangers

The range

Six hangers, housed or open

Housed hangers carry the load in a steel frame; open hangers fix straight to the rod or bracket. Standard sizes are available to buy online from Fixing Smith, our group company’s store. Heavier loads and project-specific hangers come directly from us.

Housed

AH-S
Housed Spring Hanger
Steel spring in a welded housing, seated in a rubber cup that stops high-frequency noise.
Colour-coded springs · rod misalignment up to ±15° on selected capacities, see datasheet
Buy on Fixing Smith
AH-R
Housed Rubber Hanger
Double-deflection rubber in a powder-coated housing.
Up to 13 mm deflection · 40 / 50 / 60 Shore A as standard · other hardnesses on request
Buy on Fixing Smith
AH-C
Combined Spring & Rubber Hanger
Spring and rubber in series: one hanger for low- and high-frequency vibration.
Spring and elastomer in one housing
Buy on Fixing Smith

Open

AH-OS
Open Spring Hanger
The same spring and acoustic cup without the housing, for lighter suspended services.
Colour-coded springs · rod misalignment up to ±15° on selected capacities, see datasheet
Ask us for a selection
AH-OR
Open Rubber Hanger
Fixes directly to equipment brackets: the cost-effective rubber option.
Up to 13 mm deflection · 40 / 50 / 60 Shore A as standard · other hardnesses on request
Buy on Fixing Smith
AH-RE
Threaded Rod Isolator
Clips into perforated channel; isolates threaded rod for ductwork and light services.
Supplied in packs
Ask us for a selection

Datasheets, installation guides and certificates Downloads

Selection

Spring, rubber or combined?

The right hanger depends on the speed the equipment runs at and what it weighs. A hanger that is too stiff passes the vibration straight through; one that is too soft sags and bottoms out.

Spring, rubber or combined?
Criterion	Spring	Rubber	Combined
Best against	Low-frequency vibration from fans, pumps and AHUs, and from the pipework and ductwork connected to them	Higher-frequency noise and structure-borne hum	Both, where the source runs across a broad range
Deflection	Large: the spring does the isolating	Small, up to 13 mm	Spring deflection, with a rubber element in series
Typical use	Fans, FCUs, AHUs and pumps hung from the slab; the ductwork and pipework around them	Pipework, ductwork and cable trays; suspended ceilings and light equipment	Equipment hung under noise-sensitive rooms: studios, theatres, hotel bedrooms, meeting rooms; anywhere both low- and high-frequency vibration matter
Range	AH-S, AH-OS	AH-R, AH-OR, AH-RE	AH-C

Heavier loads, or a frequency you need to hit exactly? We design and size tailor-made hangers for the project.

Isolated is not restrained

A hanger keeps vibration out of the slab; it does not hold the load in an earthquake. In a seismic zone, equipment on spring hangers must be resiliently mounted yet seismically restrained: cable restraints with a controlled slack let it float in normal operation and catch it before the movement becomes damaging.