dead-stroke

from The Century Dictionary.

• Delivering a blow without recoil: as, a dead-stroke hammer. See drop-press.
• noun A stroke in power hammers (as in those driven by steam or by belts) in which the hammer-head is not instantly withdrawn after striking and the blow is inelastic in effect and is not received on any cushioning device.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Mech.) Making a stroke without recoil; deadbeat.
• adjective (Mach.) a power hammer having a spring interposed between the driving mechanism and the hammer head, or helve, to lessen the recoil of the hammer and reduce the shock upon the mechanism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Making a stroke without recoil; deadbeat.