bolt head वाक्य

As the bolt head is driven rearward, rollers on the sides of the bolt are driven inward against a tapered bolt carrier extension.
Can someone say what type of screw head socket ( or bolt head socket ) is most resistant to rounding-preferable from personal experience?
Early in the morning of 17 April 1800, " Spitfire " was nine leagues south of the Bolt Head when she sighted a brig.
As the shotgun recoils after firing, inertia causes the bolt body to remain stationary while the recoiling gun and locked bolt head move rearward.
The break came three years ago when an amateur relic hunter in Texas found a crossbow " bolt head, " or arrowhead, in a canyon.

The bolt head, locking ring, and extractor and magazines were also revised to work with the increased size and operating pressures of magnum rifle cartridges.
Bolt heads of early Post War Rubery Owen production were marked simply with " RO ", and then " Rubery Owen " was spelled out.
The breech is opened when both rollers are compressed inward against camming surfaces driven by the rearward pressure of the expanding gases upon the bolt head.
In 1913 she was in collision with a submerged rock near Bolt Head in Devon, when she was on an excursion trip from Plymouth to Torquay.
In addition to the bolt heads, the site has so far yielded some pieces of horseshoes and some unusual horseshoe nails, a type never seen before by archeologists.