ASME B107.24 pdf download LOCKING PLIERS
Materials used in the manufacturing of the pliers shallbe such as to produce pliers conforming to the require-ments hereinafter specified.
Pliers shall be similar to the figure to which referenceis made and shall be proportioned in all parts so as to meet the requirements of this Standard. Pliers shall be-provided with a toggle or cam device having an adjust-able mechantsm designed so that the jaws can be clamped and locked. Pliers shall be released by handanywhere within the capacity of the pliers by any releasemechanism similar to Fig.1.Test specimens shall with-stand applicable test procedures without cracking orbreaking.
Handles of pliers shall be through hardened from 30HRC to 50 HRC or case hardened from 75 HR15N to86 HR15N with a case depth of a minimum of 0.010 in.(0.25 mm).Handles shall be so shaped as to afford acomfortable grip and shall be free from rough edges andsharp corners.The minimum handle clearance betweenthe fixed and moveable handle shall be as specified inthe appropriate tables, when the pliers are locked in anyposition of the jaws. Outer hand-gripping surfaces ofhandles shall be smooth, knurled, or impressed.
Pliers joints shall have no excessive looseness, play,or any other indications of side play of the two halvesof the pliers when opened or closed that would impairthe function of pliers. Joint fasteners shall be throughhardened from 25 HRC to 50 HRC. Where fastenersreceive a case hardening treatment in addition to thethrough hardening, a maximum hardness of 60 HRC orequivalent will be permitted.
4.6.1 Jaw Openings. Ends of jaws shall open, whenadjusted by the screw, to the respective minimum dis-tance specified in Tables 4 through 8. Pliers shall operatein a smooth and uniform manner.
4.6.2 Jaw Hardness. Jaws shall be through hardenedfrom 45 HRC to 60 HRC or case hardened from 83
HR15Nto 90 HR15N with a case depth minimum of0.010 in.(0.25 mm).
4.6.3 Jaw Serration.Serrated surfaces for Classes 1,2,and 3 shall have continuous and uniform sharp projec-tions.
4.7 Adjusting Screw
Adjusting screw located at the end of the handle shallhave a minimum hardness of 30 HRC.
Pliers shall be marked in a plain and permanent man-rer with the manufacturer’s name or with a trademarkof such known character that the source of manufactureand country of origin shall be readily determined. Mark-ing shall be as permanent as the normal life expectancyof the plicrs, providing the surface to which it wasapplied has not been subjected to a fretting or abradingaction,and is capable of withstanding the cleaning nor-mally experienced during its intended use.
4.9.1 Appearance.Surfaces shall be tested in accor-dance with ASME B46.1.Surfaces shall be free from pits,nodules, burrs, and other conditions that may adverselyaffect the performance or appearance. Ground surfacesshall have a maximum surface roughness of 200 uin.(5.1 um) arithmetic average. Measurement of the finishshall be made with a measuring instrument using acutoff length of 0.03 in.(0.8 mm).
4.9.2 Coating. Coatings shall be adherent, smooth,continuous and free of pits, blisters, nodules, oxide scale,and any other conditions that may interfere with theprotective value and serviceability of the pliers.Cad-mium plate will not be allowed. Pliers shall be coatedwith a supplementary rust preventative treatment.
Spring shall be capable of opening the jaws to therespective minimum jaw opening tip-to-tip dimensionas specified in the tables for the individual type andclass of pliers.
Dimensions shall be determined by measuring thepliers with jaws in the closed and locked position. Theoverall length measurement shall include the adjustingscrew.