Mackay M137063 Recessed Flange Isolator Type 31, Duro 50, 310 kg load

The Mackay Type 31 is a recessed flange isolator for equipment that needs high load capacity together with relatively large static deflections in the axial direction. Mackay says it gets its high loading for its size by using the rubber in both compression and shear (manufacturer-stated).

This listing has three part numbers, M137063, M137061 and M137062, in Duro 50, 60 and 70. Loads run from 310 to 960 kg with 6.0 to 6.5 mm deflection, and each weighs 1.18 kg. The flange is a four-hole plate 91 x 106 mm with ø10.2 mm holes, and the isolator is 66 mm high (manufacturer-stated). Mackay lists it as supplied with overload and rebound washers (manufacturer-stated).

Where this product is used

• Supporting equipment that needs high load capacity with relatively large static deflections in an axial direction (manufacturer-stated).
• Installations where overload and rebound washers control and limit the movement of the suspended equipment under shock loads (manufacturer-stated).

Features

• Rubber is used in both compression and shear, which gives high loading for the size (manufacturer-stated)
• Supplied with overload and rebound washers (manufacturer-stated)
• Overload and rebound washers control and limit movement of the suspended equipment under shock loads (manufacturer-stated)
• Central fixing bolt is torque tightened to the recommended value (manufacturer-stated)

Common specifications

Key specifications

Figures are from the Mackay Vibration Isolators catalogue (Industrial Edition 09/2026). Dimensions are in millimetres. Mackay prints all properties as nominal and asks you to contact them for technical advice.

Selecting the right option

Choose by load first: each part number has its own load figure and Duro, so work out the share of the machine weight each mount carries and pick the figure that matches. Then check the plate against your steelwork: four ø10.2 mm holes on a 70 x 82.5 mm pattern, plate 91 x 106 mm. Mackay says the central fixing bolt should be torque tightened to its recommended value. Mackay prints all properties as nominal and asks you to contact them for technical advice, so confirm critical loads and shock conditions with them. If your load is outside 310 to 960 kg, the larger Mackay recessed flange isolators are linked below.

Related products

Other Mackay recessed flange isolators: Mackay Recessed Flange Isolator Type 40, Mackay Recessed Flange Isolator Type 70 and Mackay Recessed Flange Isolator 172 x 150 x 100mm.