ASME B107.8 pdf download

ASME B107.8 pdf download

See Fig. 1 as applicable.
adjustab/e jaw movable portion of the wrench that contacts the fastener.
adjusting worm: portion of the wrench used to adjust theclearance between the fixed and adjustable jaw.
fixed jaw: portion of the frame that contacts the fastener
frame portion of the wrench containing the fixed jawand handle.
hand/e portion of the wrench by which the tool is held.
proof torque: predetermined test torque to which a sampleis subjected.
worm pin. pin used to retain the adjusting worm in theframe.
worm spring. spring used to induce friction between theframe and adjusting worm for holding the adjustingworm in any preset position.
The figures in this Standard are descriptive and notrestrictive, and are not intended to preclude the manufacture of wrenches that are otherwise in accordancewith this Standard.
51 Materials
The materials used in the manufacture of thewrenches shall be such as to produce tools conformingto this Standard. The frame, adjustable jaw, adjustingworm, and worm pin shall be steel
5.2 Marking
Wrenches shall be marked in a legible and permanentmanner with the manufacturer’s name or with a trade-mark of such known character that the source of manu-facture and country of origin may be readily determined
5.3 Hardness
The frame (fixed jaw and handle) and adjustable jawshall show a hardness of not less than 40 HRC nor morethan 50 HRC when tested as specified in para.6.1.
5.4 Proof Torque
Wrenches shall withstand the proof torque specifiedherein for the appropriate size without failure or permanent deformation (set) that might affect the durability or serviceability of the wrench. There shall be no formation of cracks or fracture of any part of the wrench.including jaw, frame, worm, and worm pin. After prooftorque tests, there shall be no resultant binding or loos-ening of the adjustable jaw. Before and after the prooftorque test, each wrench shall be opened and closed toverify the wrench operates over the full range of thejaw opening.
5.5 Finish
5.5.1 Surface Finish. Wrenches shall be free from rustfins, burrs, pits, nodules, and other conditions that mayimpair their serviceability, durability, safety, or appear-ance. The external forge flash shall be removed to blendsmoothly with adjacent surfaces.
5.5.2 Coatings. The frame and the adjustable jawshall have one or more of the coatings described below,with the exception of zinc. Worm and worm pin shallhave any of the following coatings:
(a) Nicke/-Chromium P/ate. On wrenches with decora-tive nickel-chromium plating, the minimum thicknessshall be 0.00015 in for nickel and 0.000003 in. for chrome,unless the wrench passes the test in para.6.5. Nickeiron undercoating (16% iron max) may be substitutedfor nickel.
(b) Phosphate. Wrenches having a chemically pro-duced phosphate coating also shall have a coating ofrust preventive.
(C) Oxide. Wrenches having a coating consisting of achemically produced oxide also shall have a coating ofrust preventive.
(d) Zinc Adjusting worms and worm pins may havea coating of electrodeposited zinc of 0.0003 in. minimumthickness.
(e)A/ternate Coatings. Alternate coatings may be usedin lieu of nickel-chromium and shall be subjected to theAlternate Coating Test, as specified in para.6.5

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