ASME B107.18:2003 pdf download

ASME B107.18:2003 pdf download.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 perma- nently 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 posi- tion in such a manner as to cause the jaws to finnly and securely grip and hold strands of lock wire. A wire clearance opening shall be provided between the two jaws and located between the gripping and cutting areas of the jaws. This opening shall be of a size and design which will permit 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 per- forming 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 maxi- mum permissible opening at the top of the jaws, when closed, shall be as shown in Figs. 1 and 2.
5.4 Marking Pliers shall be marked in a plain and permanent man- ner with the manufacturer’s name or with a trademark of such known character that the source of manufacture and country of origin shall be readily determined. Mark- ing 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 to a fretting or abrading action) and be capable of withstanding the cleaning pro- cedures normally experienced during its intended use. 5.5 Handles Handles shall 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 Jaws 5.6.1 Hardness. Jaws shall have a hardness of 36 HRC to 50 HRC. The gripping portion of the jaws and wire cutter shall be heat treated to a hardness of 56 HRC to 64 HRC. Jaw surfaces and edges shall not damage the wire being twisted. 5.6.2 Cushion Grip Throat. Cushion grip throat, when provided, shall grip and retain cut wire end. The cushion grip throat shall be nonmetallic and capable of with- standing 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 normal use. 5.7 Joint Fastener The fastener shall have a hardness of 25 HRC to 50 HRC. 5.8 Spiral Mechanism The spiral mechanism shall be capable of producing a close, uniform twist in safety wire without binding of or damage to the mechanism. This mechanism shall be mounted between the handles of the pliers and shall be permanently affixed to one handle in such a position that the longitudinal axis of the mechanism shall corre- spond to the longitudinal axis of the pliers. The mecha- nism, when actuated, shall cause pliers to rotate about its longitudinal axis in its intended direction(s). Each full actuation of the mechanism shall cause the pliers to make the following minimum number of complete rotations