A-A-2558A
3.2 Handle and head. The handle and head shall be either integral, threaded or the head shall be welded
securely to the handle. The handle shall be either a straight, round steel bar, or steel tubing smoothly
finished to afford a comfortable handgrip. The head shall be drop-forged steel or malleabIe iron and aIl surfaces that bear or mate with the body shall have a satin finish.
3.3 Body. The body shall be drop-forged steel with a minimum of ten (1O) teeth or notches on the
outside diameter to assure ratcheting with the handle having a swing of 36 degrees or less. The inside
tapered hole shall be either American Standard taper or bitstock taper to accommodate drill shanks
within the capacity of the drill. The tapered hole shall be smoothl y finished and shall be concentric with
the bearing surfaces on the outside diameter. The outside diameter of the spindle or the end opposite the tapered hole shall be threaded to accommodate a body nut, or other means provided for securely holding the body in tbe head. The body shall form a part of the ratchet mechanism. he taper square hole shall be smooth and concentric with the bearing surface on the outside diameter.
3.4 Sockets. Sockets for ratchet drills shall have a standard self-holding taper in accordance with ASME B5.1O.
3.5 Ratchet Mechanism. The ratchet mechanism shall be enclosed in the head and secured in such a
manner as to minimize loosening during extreme usage. The ratchet mechanism shall be reversible by
movement of a shifting lever, knurled button, or equal means which permits ratcheting operation of the
body in either direction of rotation. The shifting lever or button shall be steel and shall be located in the head or at the handgrip end of the handle.
3.6 Feed Screw. The feed screw shall be alloy steel. The outside diameter of the screw shall be
threaded with a class 3 thread for engaging the spindle end of the body. One end of the screw shall have
a knurled collar with at least four (4) holes equally spaced at right angles to the axis to provide means
for applying pressure to the drill. Tbe knurled end of the screw shall be provided with an integral or
removable hardened-steel center.
3.7 Pawl. The pawl shall be hardened alloy steel. The pawl shall be firmly attached to a rod or pin
suitable for reversing the action of the ratchet. A spring OTother means shall be provided for applying
the proper tension on the pawl when engaged in the teeth or notches of the body.
3.8 Feed Pin. The feed pin shall be steel, suitable for regulating the feed screw in order to apply
pressure to the drill.
3.9 Screw Threads. The screw threads used with the ratchet drills shall be in conformance with the
screw-thread standards of FED-STD-H28.
3.10 Finish. All exposed metal surfaces of the ratchet drills shall have one of the coatings specified
below. All external surfaces shall be free from pits, nodules, forge flash, cracks, burrs, and other detrimental defects.
3,10.1 Bright Chromium Plate. The coating shalI be electro-deposited metals consisting of nickel
followed by chromium. The minimum thickness shall be 0.0002 inch for nickel and 0.00001 inch for chromium.
3.10.2 Bright Zinc Plate. The coating shall be electro-deposited nickel. The minimum thickness shall be
0.0002 inch.
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