ASME B107.18-2003 pdf – PLIERS: WIRE TWISTER.
Wire twister pliers shall incorporate a device, which, when actuated, will cause the pliers to rotate about its longitudinal axis. The halves of the pliers shall be permanently joined with a through fastener that shall act as the pivot or fulcrum point of the pliers. A locking device,
when engaged, shall hold the handles in a closed position in such a manner as to cause the jaws to firmly and securely grip and hold strands of lock wire.
A wire clearance opening shall be provided between the two jws and located between the gripping and cutting areas of the jws. This opening shall be ofa size and design which will perruit the user to swiftly and easily deflect double strands of wire out of the sides of the jaws and away from the cutting edges when performing continuous (multiple) lock wiring operations.
The nose design shall be as shown in Figs. 1 through 4 and blend with the radius of the sides of the pliers in accordance with good commercial practice, The maximum permissible opening at the top of the jaws, when closed, shall be as shown in Figs, 1 and 2
5.2 Material
The materials used in the marufacture of the pliers shall be such as to produce pliers conforming the requirements specifed herein.
5.3 Finish
Surfaces shall have a nust preventive reatment and be essentially free from pits, nodules, burrs, cracks, and other conditions that would adversely affect the performance or safety of the tool. When provided, coatings shall be adherent, smnooth, continuous, and free from any conditions that would interfere with their protective value, safety, and function.
5.4 Marking
Pliers shal be marked in a plain and permanent manner with the manufacturer ‘s name or with a tademark of such known character that the source of manufacture and country of origin shallbe readily determined. Marking shall be as permanent as the normal Life expectancy of the pliers to which it is applied (providing the marked surface has not been subjected a fretting or abrading
action) and be capable of withstanding the deaning procedures rormally experienced during its intended use.
5.5 Handles
Handles shal have a hardness of 36 HRC to 50 HRC, shall be shaped to provide a comfortable handgrip, and shall be free from rough edges and sharp comers.
5.6 Laws
5.6,1 Hardness. Jaws shall have a hardness of36 HRC to 50 HRC. The gripping portion of the jaws and wire cutter shall be heat treated to a hardness of 56 HRC 64 HRC. Jaw surfaces and edges shal not damage to wire being twisted,
5.6,2 Cushlon 6rip Throat. Cushion gip throat, when provided, shall grip and retain cut wire end. The cushion grip throat shall be nonmetallic and capable of withstanding normal use without deteriorating or rubbing off and shall pass the solvent resistance test in para. 6.4.
Cushion grip throat shall remain permanently attached under norrnal use.