Therefore, the msb10 would be selected, with a screw diameter of 10mm like the m8. Materials, mechanical properties and markings james glen. Details of the software products used to create this pdf file can be found in the general info. Proof load psi yield strength min psi tensile strength min psi standard bolt identification markings. In this video i have talked about reduction factors that. Properties of externally threaded fasteners chart in the fastenal technical. Proof load is the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. Fastener description material nominal size range in.
A number of standard documents are available for the selection, installation. An axial tensile load which the product must withstand without evidence of any permanent set. Screws too short for this formula shall be threaded as close to the head as practicable. The higher tensile strength of unbrako socket screws can be translated into savings. In the table to the right, the allowable load for load over 200kgf for a strength category of 10. This technical information is supplied as a courtesy. Steel institutes document, specification for the design of.
Kn grade of bolt according to mechanical properties nominal size of threads hardness m12 m16 m20 m22 m24 m27 m30 f 10 t 84 157 245 303 353 459 561 h r c 27 38 mechanical properties grade of bolt according yield tensile elongation reduction to mechanical properties strength strength % of area nmm 2 n. Proof loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread. To find the tensile strength of a particular bolt, you will need to refer to mechanical. Likewise for a load of 200kgf, the stripper bolt would be scm435, 3338hrc, with a strength category of 10. Mechanical properties of steel bolts, screws and studs. In this study, the tensile characteristics of a friction connection using a highstrength bolt, based on the clamping force loss developed by sectional.
Materials f 606, standard test methods for determining the mechanical properties of. Proof loads and tensile strengths are computed by multiplying the proof load. The maximum load at which a material exhibits a specific permanent deformation. Guide to design criteria for bolted and riveted joints second edition. Determination of the tensile and shear strengths of. Current design practice that is founded on an allowable stress format treats. The fastener manual was intended primarily for aeronautical applica tions, where outgassing is typically not a. Formed steel design manual aisi, 1996 gives design provisions for. However, unbrako socket cap screws are consistently maintained at 190,000 and 180,000 psi depending on screw diameter. Tensile strength is an expression of the maximum capaci ty of a particular material to stretch under tension load prior to failure. The maximum load in tension pulling apart which a material can withstand before breaking or fracturing.