Anti-Vibration Mounts

Anti-Vibration Mounts & Vibration Isolators — Mackay, Conflex & Multicushion

Anti-vibration mounts (also called vibration isolators or rubber mounts) sit between a vibrating machine and its supporting structure to absorb dynamic motion, reduce noise transmission and protect both the equipment and the building it sits on. AIMS Industrial is a specialist Australian supplier of 108 anti-vibration mount lines — cylindrical rubber mounts, Mackay flange isolators, Conflex heavy-duty mounts, multicushion isolators and levelling feet — from Mackay (Australian manufactured) and Finer Power Transmissions.

Mount Types — At a Glance

• Cylindrical rubber mounts — male-male, male-female and male-buffer in 40, 55 and 65 Shore hardness. The workshop default for isolating motors, fans, compressors and general machinery.
• Mackay flange isolators — M110, M114, M140, BRB series, plus MD and recessed flange types for electric motors, generators and industrial fans.
• Mackay Conflex isolators — small, medium and large heavy-duty configurations for high-frequency vibration from compressors, pumps and centrifugal equipment.
• Multicushion & dual-compression isolators — variable-direction loads on mobile plant, generator sets and vibrating screening.
• Levelling feet — for machinery floor mounting, alignment and load distribution.

Anti-Vibration Mount Selection — Quick Reference

Three inputs drive mount selection: static load per mount, excitation frequency, and required isolation efficiency. Common selection patterns:

For the full selection methodology including deflection calculation and natural-frequency analysis, see the Anti-Vibration Mounts Guide.

Cylindrical Rubber Mounts

Male-male, male-female and male-buffer cylindrical mounts in 40, 55 and 65 Shore hardness ratings provide a flexible solution for isolating motors, fans, compressors and general machinery. Softer compounds (40 Shore) offer greater deflection and isolation efficiency; harder compounds (65 Shore) suit higher load applications with less movement allowance. The choice of compound hardness is driven by the static load per mount and the required natural frequency of the isolation system.

Typical sizes: 20×15, 25×15, 30×20, 40×30, 50×40, 60×40, 75×40, 100×40 mm with M6, M8, M10 and M12 thread options. Load ratings from 5 kg to 200+ kg per mount.

Mackay Flange Isolators

Mackay light-duty (M110, M114), heavy-duty (M140) and BRB series flange isolators are engineered for mounting electric motors, generators and industrial fans to base frames and fabricated structures. MD and recessed flange types provide low-profile mounting where clearance is limited. Mackay is an Australian manufacturer — see the wider Mackay range covering rubber bellows and engineered rubber products.

Mackay Conflex & Multicushion Isolators

Conflex isolators in small, medium and large heavy-duty configurations handle high-frequency vibration from rotating plant — compressors, pumps and centrifugal equipment in particular. Multicushion and mobile dual-compression isolators suit applications with complex vibration spectra or where the load direction varies — for example, mobile plant, generator sets and vibrating screening equipment. Sizes from 80 × 50 mm to 140 × 85 mm with load ratings up to 270 kg per mount.

Standards & Regulatory Context

Anti-vibration mount selection in Australian industry sits within several standards frameworks:

• AS 2670 — Mechanical vibration: Evaluation of human exposure (whole-body, hand-arm)
• ISO 10816 — Mechanical vibration severity of machines with non-rotating parts
• ISO 14695 — Industrial fans vibration testing
• AS/NZS 1170 — Structural design actions, where vibration loads pass to structure

Compliance generally requires identifying the vibration source frequency (typically motor RPM × number of poles / 60, plus harmonics), measuring or calculating static load per mount, and selecting an isolator with a natural frequency at least 3-5× below the excitation frequency. For installations where vibration is a known compliance issue, an acoustic / vibration consultant can specify the mount and confirm performance post-install.

Selection Guidance

• Static load per mount: Total weight of equipment ÷ number of mount points. Add a 20-30% safety factor for dynamic loads.
• Excitation frequency: for electric motors, frequency = (RPM × number of poles) ÷ 60. A 1450 RPM 4-pole motor excites at 48 Hz.
• Natural frequency target: the isolation system natural frequency should be 3-5× below the excitation frequency for effective isolation (above ~85% isolation efficiency).
• Even loading: verify load distribution across all mount points — uneven loading creates resonance issues and accelerated mount wear.
• Sub-base mounting: for very low-frequency excitation (slow reciprocating engines, large compressors), a concrete inertia block on isolators provides better isolation than direct mounting.

Companion Ranges at AIMS

• Mackay range — full Mackay rubber engineering catalogue.
• Rubber bellows — flexible expansion joints for pipe and ductwork vibration isolation.
• Electric motors — single- and three-phase motors that typically sit on the mounts above.
• Flexible couplings — for shaft connection with vibration tolerance.
• Shims & shim stock — for setting machinery foot heights during installation.
• Lubrication — for the rotating equipment the mounts support.

Order Anti-Vibration Mounts from AIMS Industrial

AIMS Industrial stocks 108 anti-vibration mount lines from our Sydney warehouse for same-day or next-business-day dispatch Australia-wide. For mount selection by load and frequency, troubleshooting a vibration issue on existing plant, or volume pricing on a new installation, call (02) 9773 0122, contact our team or request a quote.