Head Marking Grade and Material Nominal Size Range (inches) Mechanical Properties Proof Load (psi) Min. Yield Strength (psi) Min. Tensile Strength (psi) 307A Low carbon steel 1/4" thru 4" N/A N/A 60,000 No Markings Grade 2 Low or medium carbon steel 1/4" thru 3/4" 55,...
Thread Size Chart Thread fit categorizes the tolerances between the peaks and valleys (crests and roots) of mating threaded hardware. In metric descriptions, thread fit is classified by a number and letter system; lower numbers indicate threads with higher precision and letters indicate tolerance pos...
KT Bolt Specializes in Standard, Non-Standard and Custom Fasteners About Us Products Committed to service since 1969! KT Bolt Manufacturing has served the fastener industry since 1969 as a manufacturer of non-standard and custom bolts and fasteners. During this time we have worked hard to ...
letters stamped on the head like the picture above. With this particular bolt, the letters “R S B” at the top of the bolt are short for “Regis Screw & Bolt” (A British manufacturer).The letter “R” on the underside of the hex tells us about the thread type and grade too.
Alloy718orGrade8CS40(4.5)100(11.3)200(22.6)600(67.8)600(67.8)CarbonSteel316SSorB7CS40(4.5)100(11.3)200(22.6)500(56.5)500(56.5)Grade8CS40(4.5)100(11.3)200(22.6)575(65.0)575(65.0)TitaniumorAlloy400316SSorAlloyK-50040(4.5)100(11.3)200(22.6)450(50.9)450(50.9)BodyBolt/StudTorqueChart,...
Take the minimum yield in psi of the ASTM grade (see our Strength Requirements by Grade Chart for this value), multiplied by the stress area of the specific diameter (see our Thread Pitch Chart). This formula will give you the ultimate yield strength of that size and grade of bolt. Examp...