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