Mackay M400300 Surefoot Levelling Isolator, M12 x 1.75, 30 to 300 kg

The Mackay Surefoot levelling isolator (Mackay's catalogue spells it Sure Foot) is a threaded levelling foot designed for cost-effective machine levelling, for isolator loads up to 6000 kg (manufacturer-stated). Mackay says it is an effective and durable way to isolate free-standing equipment and machinery on non-level surfaces, and that it is made using Nitrile rubber, which has better chemical and oil resistance than natural rubber (manufacturer-stated).

This is the standard range, made with electrolytically plated zinc applied to automotive standards (manufacturer-stated). It has 5 part numbers, M400300 to M406000, with threads from M12 x 1.75 to M24 x 3.0 and load ranges that run end to end from 30 kg to 6000 kg. For the first three sizes Mackay lists a stainless steel (type 304) version, and recommends it where better corrosion resistance is required (manufacturer-stated). M404000 and M406000 have no stainless version in the Mackay catalogue.

Where this product is used

• Machine levelling at low cost, for isolator loads up to 6000 kg (manufacturer-stated)
• Isolating free-standing equipment and machinery on non-level surfaces (manufacturer-stated)
• Installing machinery with less vibration, less noise and less wear, and less downtime when moving it (manufacturer-stated)

Features

• Designed for cost-effective machine levelling, for isolator loads up to 6000 kg (manufacturer-stated)
• Made using Nitrile rubber for better chemical and oil resistance than natural rubber (manufacturer-stated)
• Standard range made with electrolytically plated zinc applied to automotive standards (manufacturer-stated)
• Stainless steel (type 304) version listed for M400300, M401200 and M402500 (manufacturer-stated)
• Mackay lists an exposed base range (B to C) and an adjustment range (D to E) for each size (manufacturer-stated)

Common specifications

Adjustment and diameters

Key specifications

Dimension letters A to H follow the Mackay drawing, in millimetres: A overall height, B and C exposed base (min and max), D and E adjustment (min and max), F thread, G base diameter, H cap diameter. Deflection is Mackay's figure at the maximum exposed base, at the minimum and at the maximum load of the range. Mackay prints the minimum adjustment for M400300 as "31.7." and this page reads it as 31.7 mm. Mackay prints all properties as nominal and asks you to contact them for technical advice.

Selecting the right option

Share the machine weight across the number of feet and choose the size whose load range covers the load on each foot. Mackay's ranges meet at 300, 1200, 2500 and 4000 kg, so where a load sits on one of those figures compare the deflection figures (given at the minimum and maximum load) and the base diameter to choose. Check the thread, the base and cap diameters and how much height adjustment you need against the table. Mackay prints all properties as nominal: contact Mackay for technical advice on heavy or critical machines.

Related products

The stainless steel (type 304) version: Mackay Surefoot Levelling Isolator Stainless Steel. Other Mackay adjustable feet: Mackay Adjustable Rubber Foot SV Type, Mackay Adjustable Rubber Foot JT Type and Mackay Adjustable Rubber Foot SX - 10 to 25kg.