cushion head

cushion head, Brit. pile helmet

cushion head
A cap which covers and protects the head of a pile while it is being driven into the ground by a pile driver.
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Tenders are invited for Pneumatic Cylinder Bore 3 1/4 Inch Stroke 5 Inch Rod Dia Equal 1 Inch Cushion Head Both Ends, Head Trunion Mounting Style.
The FT Air Cushion Head generates a cushion of air between the film and the head.