ASTM A325

ASTM A325 - Wikipedia, the free encyclopediahttp://en.wikipedia.org/wiki/ASTM_A325 ASTM A325 From Wikipedia, the free encyclopedia ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1 2 to 1-1 2 in diameter.[1] The equivalent metric standard is ASTM A323M, which is titled Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength. It defines mechanical properties for sizes M12–36.[2] There is also a T version, which is used to refer to fully threaded bolts.[3] This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services. Contents 1 Types 2 Connection types 3 Mechanical properties 4 References Types The type refers to the type of material used to make the bolt. The standard currently defines two types, however it previously defined the following three:[3] Type 1: Medium carbon steel, boron steel, or medium carbon alloy steel Type 2: Low carbon martensitic steel[4] (withdrawn from the standard in 1991) Type 3: Weathering steel Note that independent of the material the bolt is quenched and tempered.[4] Connection types There are also three connection types defined:[3] SC: A slip critical connection. N: A bearing type connection where the threads are on the shear plane. X: A bearing type connection where the threads are not on the shear plane. Mechanical properties These types of bolts are designed to be tightened to near their proof strength, in order to create significant bolt 1 of 3 28/08/2012 4:16 PM the free encyclopedia http://en. ^ ASTM A325 .wikipedia.htm.org/Standards/A325.8 bolts according to ASTM F568M.astm. but have a thicker and wider head to more effectively distribute the load. http://www.htm) .[5] ASTM 325 bolts can be considered equivalent to Grade 8. see ASTM A490. retrieved 2 of 3 28/08/2012 4:16 PM . These bolts use the same material as their common cousins (ASTM F568M for metric bolts).09 (http://www. For a higher strength version of this type of bolt. The standard states that the bolts must be tightened to at least 70% of the tensile strength.Wikipedia.org/wiki/ASTM_A325 tension. Head markings and mechanical properties for imperial sizes[4] Tensile Yield Proof Nominal size strength (min) strength strength Head marking Grade range [in] [ksi] (min) [ksi] [ksi] or Type 1 [6] 1 2–1 (inc.ASTM A325 .) Core hardness [Rockwell][6] C24–35 85 92 120 1–1-1 2 74 81 105 C19–31 Type 2 1 2–1 85 92 120 C24–35 1 [7] Type 3 2–1 85 74 92 81 120 105 C24–35 C19–31 1–1-1 2 Head marking Head markings and mechanical properties for metric sizes[5] Proof Yield strength Tensile strength Nominal size strength Grade (min) [MPa] (min) [MPa] range [mm] [MPa] Type 1 Type 2 Type 3 Core hardness [Rockwell] 12–36[2] 600 660 830 C23–34 References 1. This modified geometry is often referred to as heavy hex geometry.astm.org/Standards/A325. 3.edu/~sdesign1/Text/fasteners_si.php?title=ASTM_A325&oldid=499557441" Categories: ASTM standards Screws This page was last modified on 18 August 2012 at 21:56. retrieved 2009-06-13.html) . 4.Wikipedia. ^ a b c ASTM A325 (http://www. http://www.icaen.org/Standards/A325M.com/technicalinformation/astm/ASTM_A325.com/technical/technical. Text is available under the Creative Commons Attribution-ShareAlike License. ^ Other markings may be used to denote atmospheric corrosion resistant material Retrieved from "http://en. the free encyclopedia http://en.html. 7.wikipedia. See Terms of use for details. retrieved 2009-05-30.uiowa.asp) .org/wiki/ASTM_A325 2.com/technical /grade_markings_steel.com/technical/grade_markings_steel.com/technicalinformation/astm/ASTM_A325.htm) . 5.americanfastener.09 (http://www.fastspecinc.fastspecinc. retrieved 2009-06-06.astm. 3 of 3 28/08/2012 4:16 PM .portlandbolt.edu/~sdesign1/Text/fasteners_si. 2009-06-13. additional terms may apply. http://www. Inc. retrieved 2009-06-06.html.html) .portlandbolt.icaen.uiowa. ^ a b ASTM A325M . Wikipedia® is a registered trademark of the Wikimedia Foundation.wikipedia.html. ^ a b Grade Markings: Carbon Steel Bolts (http://www.asp.astm. a non-profit organization. http://www.americanfastener.htm.com/technical/technical.. http://www. ^ a b c ASTM.org/w/index. retrieved 2009-06-13.org/Standards/A325M.ASTM A325 . 6.html) . ^ a b Metric structural fasteners (http://www. SAE and ISO grade markings and mechanical properties for steel fasteners (http://www. http://www.