φ = Lead angle (helix angle) of the thread A thread’s strip strength depends on both its geometry and material. An external unified coarse thread (UNC), whose cross section is approximately triangular, is wrapped as a helix around a solid cylinder. To enter details about the thread, click on the Select your thread size, your effective length of thread engagement and the shear strength of the weakest material and then SOLVE. Thread Stripping Analysis using the BOLTCALC Program (continued) (Side) The Thread Friction Coefficient Form will appear. The angle between the flanks of the thread measured in an axial plane. Thread Calculations 1. Applying this formula results in the effective length of thread engagement of L 0 =11.5mm. - 6 - www.StanleyEngineeredFastening.com Thread forming and Stripping Torque Because friction increases as penetration increases, the differential between the thread forming torque and the strip (failure) torque must be maximized. P = Pitch, mm or threads per inch (t.p.i.) β = The thread profile angle. This times shear area=the load it will handle at shear with no factor of safety added. Formula for Ats (when shear occurs at the roots of the thread) Ats = π n Le Dsmin[1/(2n) + 0.57735 (Dsmin - Enmax)] (Below) On clicking 'Continue' from the Thread Stripping Friction Form, the Thread Strength Data Entry Form will appear. Knowledge of the thread stripping strength of tapped holes is necessary to develop full tensile strength of the bolt or, for that matter, the minimum engagement needed for any lesser load. Thread Stripping.xls Thread Stripping.xls. S ty. The bolt tensile strength and thread-stripping strength are roughly the same if the nut thickness is td≈0.47 . There are other formulas out there that take in account thread flank angles, coeficient of friction, external thread or internal thread material strength, etc, etc. The 0.577 value corresponds to the reciprocal of the √3 term that appears in the von Mises failure criterion. These equations originate from ASME and ISO specifications for inch and metric threads, respectively, as well as materials and mechanical engineering concepts. Therefore, the stripping strength of an assembly depends on the shear strength of the nut and bolt materials. Inch Threads Metric Threads References ASME B1.1 ISO 68 -1 ISO 724 ISO 898 -1 Tensile stress area of threads, A s =∙ 2= 4 ∙ : ;2= 4 Singley's formula is based on a "square" thread form. The distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis. The number of threads that resist load depends on the thread spacing, or pitch, THREAD SIZE M1 M1.2 M1.6 M2 M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36 M42 Select the entry shown and then click the 'Ok' button. CLEAR ALL will clear all fields. Tensile Strength Strain (% Elongation)-40° 73° 170° 250° Clamp Load (lbs.in) Time (min.) The nut is generally softer than the bolt. Shear (thread stripping) strengths of screw threads under load are dependent, in addition, on mating component relative material strengths, connection geometry, and coefficient of friction between thread bearing surfaces. (pin) thread, assuming that both the pin and box have the same yield strength, etc. THREAD STRIPPING STRENGTH - Tribology / A generally used practical calculation method for the tread stripping strength is given by the formula A th =0.5πd 0 L 0. where d 0 = (d 2 +d 3 )/2. Rating: 8 Description. The size of a screwed fastener is first established by calculating the tensile load to be withstood by the screw and selecting a suitable screw to withstand the tensile load with the appropriate factor of … Conversely, if only limited length of engagement is available, the data help determine the maximum load that can be safely applied without stripping the threads

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