These bolts are categorized into three grades, grade a headed bolts, grade b headed, heavy hex bolts and grade c nonheaded anchor bolts where astm a307 grades a and b has one inch diameter bolt. Its strength grades are indicated by the letter a plus three numerals stamped on the bolt head. Unless otherwise specified, the grade and style of nut for each grade of fastener, of all surface finishes, shall be as follows. Interchangeability of grade 2 and a307a fasteners in general, since the minimum strength requirement of a grade 2 is greater than that of an a307a. Astm a307 specifications covers 2 bolting grades with requirements for chemical composition, mechanical properties, heattreatment, recommended nutswashers and bolt markings. Grade 2 requirements for diameters ranging from 14 through 34 only apply to headed fasteners up to and including 6 in length, and to studs of all lengths. Higher strength nuts may be a suitable substitute provided bolt standard allows. Carbon steel bolts in astm a307 grades a and b carbon and alloy steel nuts in astm a563. Torque values for 14 and 516in series are in inchpounds. Interchangeability of grade 2 and a307a fasteners in general, since the minimum strength requirement of a grade 2 is greater than that of an a307a, a grade. Length of a tap bolt is measured from the underhead bearing surface to the extreme end of the bolt. A30714e1 standard specification for carbon steel bolts, studs, and threaded rod 60 000 psi tensile strength bolts studs. How does b7 material compare with grade 5 and grade 8. Single shear is load applied in one plane that would result in the.
Astm, sae and iso grade markings for steel fasteners. In the petroleum and chemical industry the fully threaded stud is the most common astm a307 bolt used for flanged connections. Astm a307 grade b heavy hex bolts and studs with a tensile strength of 60 to 100 ksi for flanged joints in piping systems with cast iron flanges. Use hardened flat washers with bolt grades 5 and 8. Grade b, a307 heavy hex bolts are externally threaded fasteners made of carbon steel. Astm a193, a320, a307, a325, a593, a354, a449, a490, f593, f1554, f3125, and many more fastener specifications. Nogrademark, sae j429 grade 1, bolts, screws, studs, low or. Grade 5, carbon steel, 14 1 1 18 1 12, 92 81, 120 105, c25c34. Astm a307 bolts astm a307 hex bolts astm a307 flange.
Astm a449 is identical in chemical properties and is used in general engineering applications. At the industrial depot, we have several high quality a307 galvanized hex bolts in our inventory. They feature a shallow, conical bearing surface, a square neck under the head and a unified thread pitch. For headed fasteners longer than 6, see sae j429 grade 1. Hex bolts grade 8 galvanized hex bolts aft fasteners. Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or.
Astm, sae and iso grade markings for steel fasteners american. A flat countersunk head keeps these steel elevator bolts from pulling through the material. This table shows the mechanical properties of b7, grade 5 and grade 8. Given here is the bolt torque chart for the astm a307 bolts. Many dont realize, but when you need grade 5 bolts, you are looking for medium strength carbon steel. Astm a307 specification for carbon steel bolts, studs, threaded rods and other externally threaded fasteners with 60 ksi tensile strength. This type of bolt has medium strength bolt, manufactured from a medium carbon or alloy steel.
An astm a325 bolt is roughly equivalent in strength to sae grade 5 and an. Torque values for 14 and 5 16in series are in inchpounds. The astm a307 fastener specification is the most commonly requested fastener grade. One end green, a307 grade c, low or medium carbon steel, 1. Astm a307 grade b is made from a low carbon steel and is a relatively low strength heavy hex bolt. I cant afford to use high strength bolts as their use is for zee purlins a. Carbon steel bolts in astm a307 grades a and b glaser. Carbon steel bolts in astm a307 grades a and b glaser bolt. Bolts designated as heavy hex bolts are very similar to standard hex bolts however the head size across the flats and across the corners is larger providing a broader bearing surface. Hex cap screws are used in more precise applications.
It covers the raw material in this case steel round bar that is used to manufacture the bolts. There are six things that can be told by looking at the head of a bolt. Astm a325 bolts are assigned to group a while astm a490 bolts are assigned to group b. One thing, which has happened to me,the inspector may require you to torque the a325 bolts whereas the a307s do not require a specified torque the somewhat ambiguous pull on a wrench by an average man. The flat head helps prevent the bolt from spinning during installation. Our superintendent went to get a307 bolts as designated by the engineer on his structural plans, and they tell him they are no longer made and only carry grade 5 bolts. Yield strength, or working load limit, is the amount of stress a material can withstand without permanent deformation tensile strength is the maximum amount of axial stress that a material can take before breaking all strength measurements are in ksi kilopound per square inch. The torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolts minimum ultimate tensile strength. Below is a brief overview, information of the approved nuts and some information on the washers used with parts manufactured under this specification. We use plywood cases pallets, freefumigated wooden box for heavy thick fitting products because reaching the products to your destination is our assurrity. Grade 5 bolts vs a307 structural engineering general.
Astm a307 grade a, covers the mechanical and material requirements for inch series. A hex bolt named for its sixsided head, is the industry standard for fasteners with forged heads. Medium carbon steel, 14 thru 112, 33,000, 36,000, 60,000. Bolt gauges carriage common head markings counter bore elevator flanged head plow heavy hex head heavy hex head specs hex head cap hex tap lanchor proof load tensile scraper blade square head step tslot tightening torque.
A grade 5 bolts can be identified by the three lines. A307 bolts by aisc astm designation are common bolts. Astm a307 grade b bolts are medium tensile carbon steel fasteners for use in general purpose piping. Best price of m2m100 carbon steel black astm a307 hex head hollow bolt hex bolt. Sae the main classifications are grades 2, 5, 8, allen heads, and stainless. Heat treated in a controlled atmosphere, these bolts can be identified by. Clamp load calculated as 75% of the proof load when specified by the standard. New with the scm 14th addition is the introduction of bolt. Astm a36 is a steel grade, not a bolt specification. A307 is basically an ungraded bolt and a325 is grade 5 or so.
Contact american fastener with any questions or for a custom quote. Our packaging section for astm a307 carbon steel nuts is of high standard, as we are concerned about reaching the products safely to the destinatin. Astm a307grade a low or medium carbon steel 14 4 60,000 b69 b100. A307 grade b differs from a307 grade a in that it has a maximum tensile strength requirement. This is the most common heavy hex bolt and includes grades a, b, and c which denote tensile strength, configuration, and its intended use. Astm a307 bolts are not assigned to a group since they are not considered to be high strength bolts. Most of these are pretty harmless, but to state that a grade five bolt is preferred over a grade 8 bolt when mounting suspension components is really dangerous. Astm a307 grade c has been replaced by astm f1554 grade 36. General heavy hex bolts include astm a307 specifications, which covers carbon steel bolts and studs ranging from 14 through 4 in diameter. The below is the astm a449 sae grade 5 bolt torque chart which provides tension, torque, tpi against their corresponding sizes.
Grade 2 flat washers should only be used with grade a307 and grade 2 hex bolts. The high strength bolts are astm a325 and astm a490. Astm a307 grade b is made from a low carbon steel and is a relatively low strength heavy hex bolt or stud specifically intended for cast iron pipe flange connections. Astm a449 is a medium carbon steel that is heat treated to develop higher strength characteristics than a307 grade b. Want to prove it to yourself, drill two holes in two pieces of bar stock 2 ft long, 3 apart at one end one 38, and the other 14. Common astm grades include a307, which roughly corresponds to sae grade 2. The steel material to conform to astm a307 specification for carbon steel externally threaded standard fasteners, grade b. Grade 2 low carbon steel up to 34 proof load 55000 psi, minimum tensile strength 74000 psi 34 112 proof load 33000 psi, minimum tensile strength 66000 psi. Grade 2 bolts a307 are a standard hardware grade steel. This is commonly used for a variety of applications such as fastening of steel and wood, and as part of several construction projects including houses, buildings, bridges, highway structures.
We provide both stocked and custom anchor bolts, anchor bolt assemblies, threaded rod, bolts, bent bolts, nuts, washers, turnbuckles, clevises and more. Download a complimentary pdf of our fastener markings chart. New with the scm 14th addition is the introduction of bolt groups in scm j3. Astm a307 is the standard specification for carbon steel bolts, studs, and threaded rods of 60000 psi tensile strength in sizes from. To find the actual weight a bolt can withstand you would have. Bolts astm a307 grade b, nuts astm a563, grade a napac, inc. Fastener specifications astm a193, a320, a307, a325, a593. Heavy hex bolts, a307 grade b, hdg inch aall american. Higher strength nuts may be a suitable substitute provided bolt standard. Astm a307 14e1 standard specification for carbon steel.
Supplier and exporter of astm a307 bolts, astm a307 anchor bolt, astm a307 flange bolt, astm a307 tap bolt, astm a307 lag bolt a307 grade a bolts, astm a307 studs, astm a307 carbon steel bolts, astm a 307 hex bolts, astm a307 threaded rods exporter in. Whereas a307 grade b is limited by its configuration heavy. An astm a325 bolt is roughly equivalent in strength to sae grade 5 and an a490 bolt is about equivalent in strength to sae grade 8. Grade 5 medium carbon steel, quenched and tempered up to 1 proof load 85000 psi 1 112 proof load 74000 psi, minimum tensile strength 105000 psi. Identification grade mark specification fastener description material nominal size range in. Hex bolts are often mistakenly called hex cap screws, though the main difference is that hex cap screws feature a washer face under the head and a chamfered point, and a hex bolt does not have a washer face or chamfered threads. This lowcarbon, mild steel bolt specification covers heavy hex bolts and fully threaded studs that are intended for cast iron flanged joints in piping systems with cast iron flanges. Astm a307 carbon steel anchor bolts,a307 bolts studs and.
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