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MACHINE SCREWS DIMENSIONS

MACHINE Screws78 LLAxis of screw thread BasicmajordiameterMinordiameterBasicpitc hdiameterThread DimensionsaTensile strength values are based on 60,000 psi. and apply to carbon steel SCREWS and SEMS only. Hex and Hex Washer head MACHINE SCREWS of sufficient length may be wedge tensile tested. Other head styles may be axial tensile tested. 2A Ex tE r nA l th rE Ad s f o r MA c h i nE sc rE w s A n d sEMsASME B (2002)Nominal Size & Threads per InchSeries DesignationAllowanceMajor DiameterPitch DiameterStress Area, in2 Tensile Strength,a lb., min. (STEEL SCREWS only)MaxMinMaxMinTolerance0-80 on Length LNominal Screw SizeNominal Screw LengthUp to 1/2 in.

Steel machine screws of diameters No. 6 to 1/2” inclusive, which are shorter than either 1/2” or 3D (where D is the nominal screw size in inches) are not subject to tensile testing. Such steel machine screws of a size to be tested shall meet the tensile load requirements listed above.

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