Mackay M181550C Type A Steel Washer, 139 mm

The Mackay M181550C is a Type A steel washer. Mackay lists it against the M801550 recessed flange isolators (the 172 x 150 x 100mm range, M80155045 to M80155070) in both the top (overload) washer and the bottom (rebound) washer columns, and says those isolators are ordered without washers (manufacturer-stated).

Mackay gives it a 139 mm outer diameter, 25 mm hole, 10 mm thickness and a weight of 1.15 kg. Mackay says overload and rebound washers (top and bottom) are necessary to limit maximum movement in the event of shock loading (manufacturer-stated).

Where this product is used

• Fitted as the overload (top) and rebound (bottom) washer on the M801550 recessed flange isolators, which Mackay lists without washers (manufacturer-stated).
• Limiting movement of the suspended equipment under shock loads (manufacturer-stated).

Features

• Type A steel washer (manufacturer-stated)
• Listed as both the top (overload) and bottom (rebound) washer for M801550 (manufacturer-stated)
• 139 mm outer diameter with a 25 mm hole, 10 mm thick (manufacturer-stated)
• Weight 1.15 kg (manufacturer-stated)

Common specifications

Key specifications

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

Selecting the right option

Match the washer to the isolator: Mackay lists M181550C against the M801550 isolators (M80155045, M80155050, M80155060 and M80155070), whose catalogue entry says overload and rebound washers are ordered separately. Check the 25 mm hole against the centre bolt you are using and that there is clearance between the rebound washer and the isolator under static load. Contact Mackay for technical advice if you are unsure.

Related products

Isolator this washer is listed for: Mackay Recessed Flange Isolator 172 x 150 x 100mm.