ASME B18.16.3M pdf free download

ASME B18.16.3M pdf free download DIMENSIONAL REQUIREMENTSFOR PREVAILING-TORQUE TYPE STEEL METRIC HEX NUTSAND HEX FLANGE NUTS
lf verifiable in-process inspection is used,inspectionsample sizes and reporting shall be in accordance withthe applicablc ASME,ASTM.or SAE quality systemconsensus standard.
For nondesignated dimensional characteristics.theprovisions of ASME BI8.18.1M shall apply.
Should a nondesignated dimcnsion be detemined tobe outside of its specified limits, it shall be deemed con-forming to this Standard if thc user who is the installeraccepts the dimension based upon form. fit, and functionconsiderations.
2 GENERAL DATA2.1 Width Across Flats
Thc width across flats，S. shall be the distanec,men-sured perpendicular to the axis of the nut, between twooppoaite wrenching flats.The maximum width acrossflats may be excecled by 0.05 mm to allow for nut de-foamation caased by introduction of the prevailing-torqucfeature.The width across flats and width across cornersmay be loss than the spocified minimame in the deformedportion of the nut containing the prevailing-torque fea-ture.
2.2 Thickness
The nut thickness，M，shail be the overall distance,mcasured parallel to the axis of the nut, from the top ofthe nut to the bcaring surface of hcx nuts,and to the planc
DIMENSIONAL REQUIREMENTS FOR PREVALING-TORauETYPE STEEL METRIC HEX NUTS AND HEX FLANGE NUTs
of the bearing circle diameter of hex flange nuts.Raisedidentification markings, if present, shall be excluded.
2.3 Hex Height
The hex height on hex flange nuts is the distance, mea-sured at a comer of the hex, from the junction of the hexportion with the flange to the top of the nut.
2.4 Wrenching Height
The wrenching height is the distance.measured at acorner of the hex,from the bearing surface of hex nuts,and from the junction of the hex portion with the flangeof hex flange nuts to the last plane of full formed hex,i.e., the plane perpendicular to the nut axis which is clos-est to the top of the nut at which the width across cor-ners is within its specified limits. Wrenching height forhex nuts is dimeasion M in Table 1. and is subject tomeasurement. Wrenching height for hex flange nuts isdimension T in Table 2, and is controlled by the gagingrequirement specified in pera.2.5.
2.5 Gaging of Hex Portion of Hex Flange NutsThe nut shall be gaged using two plain ring gages.Aand B, to demonstrate the coincidental acceptability ofhex height, wrenching height，and width across corners.Gage A shall be placed over the hex and shall seat on theflange.Gage B shall be placed on the top of the nut nor-mal to the nut axis.The two gages shall not be in con-tact.
NOTE The minimum jinside dianeter of Gage A equals the umaximamwidth acroS corners; the maximmurn inside diameter of Gage B equalsthe rninimem width across cormcrs minas 0.Ol mm; the maimuim thick-
ing height necessary “o peoride safficient dniveability o develop twowcosof Gage A was ccamputedl to be cqual toor grcatcr than thc wacnch-fimcs the torsionsl strengh of the properly malod.,exLernally thireadedcopone,
2.6 Flange
The top surface of the fnlange of hex nange nus shallbe conical or slightly rounded (oonvex). The flange pe-rlphery shall be round wlthin the specined naxirnuInflange diameter and a tolerance of -5%.The contour ofthwe edge at the flange periphery shall be optional pro-vided the minimum flange thickness is maintained ar themainimum bearing circle diamscter.
The flange shall be gaged using two plain ring gages,A and C, to demoastrate the coincidental acceptability offlange diameter and thickness.Gage C shall be seated ona flat surface and the nut plnced in it. Gage A shall bc