Strength specifications of metric threaded fasteners. Astm a394, also known as tower bolts, are lower in strength than a325, which is high strength bolts, and are commonly used in lattice towers. 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. Astm recommends against galvanizing grade bd as the high tensile strength makes it more susceptible to hydrogen embrittlement. A type 3 bolt is approximately twice as resistant to corrosion as a type 1 bolt. Metric bolts minimum ultimate tensile and proof loads. The f3125 specification is a consolidation and replacement of six astm standards, including. A307 vs a325 bolt engineeringeric structural 12 oct 15 15. Carbon steel bolt, astm a325 type 3 alloy steel bolts. Astm a490 m12 to m36 carbon steel hex bolts, construction bolt, class 4. Used in structural steel joints in heavy construction when greater yield and tensile strengths than those of an a325 bolt are required. Astm f3125f3125m is a structural bolt specification covering inch and metric bolt grades.
Contact us for any questions about your next project. Ignoring the strength increase in large a325 and f1852 bolts is a safe and conservative interim solution. Astm a325 f3125 structural bolts, steel, heat treated, 120105 ksi minimum tensile strength. In addition, you will find the estimated mechanical property requirements for each diameter of bolt required.
Technical info and astm specifications galvanized anchor. Astm a325 bolts astm a325 structural bolt a325 hex bolt. Astm a325 type 3 is a standard material specification for high strength weathering steel fasteners, for use in high tensile structural bolting and other general purpose applications. A449 is identical in strength to a325, but a more appropriate specification for headed anchor bolts. Technical info and astm specifications galvanized anchor bolts. A325 type 3 bolts are made from a corrosion resistant steel, and are only available in a plain finish. This specification covers the chemical, physical and mechanical requirements for structural bolts manufactured from steel and alloy steel, in two strength grades, two styles and two types.
Astm a325 specifications technical menu posted on july 1st, 2015 by vapro. Prior to its withdrawl in 2016, the astm a325 specification covered high strength heavy hex structural bolts from 12. A325s have a heavy hex head, a full body diameter, and are normally short in overall length since they are connecting steel to steel. Specification for structural joints using astm a325 or a490 bolts. Its virtually identical in terms of chemical and physical strengths and properties as an sae grade 5 bolt. A325 a490 heavy hex bolts structural hex bolts haydon.
Specification for structural joints using astm a325 or. Csa s1614 s1614 adopted the tensile strength, f u, and minimum pretension forces for bolts in astm bolt standards prior to publication of f3125 and values for f u are explicitly stated in s1614 standard. Type 3 is a quenched and tempered weathering steel bolting material with minimum tensile requirement of 105 ksi, yield 81 ksi and maximum hardness requirement of. It defines mechanical properties for bolts that range from 1. Yield strength, min, mpa elongation in 4d, min, % reduction in area, min, %. Astm a490 series bolts are equivalent to astm a325 bolts in application and geometry, but are made to a higher strength. A325 bolts buy hardware nuts, bolts, screws and fasteners store.
The tables in the nds are based on f yb 45ksi, which is generally thought to be a conservative value of yield strength for a307 bolts. In 2016, astm a325 was officially withdrawn and replaced by astm f3125, in which a325 now becomes a grade under the f3125 specification. An important distinction between a325 and a490 is that it a325 type 1 bolts can be galvanized. When looking at the mechanical requirements of bolts it appears that a grade a325 and sae j429 grade 5 are identical as do the. The maximum load at which a material exhibits a specific permanent deformation. The two figures indicate the tensile and yield strengths of the bolt or screw. The equivalent metric standard is astm a325m, which is titled standard specification for structural bolts. Astm fastener standards specifications for a325 bolts. Bolt torque calculator determining proper torque to bolt. This grade of studbolts are engineered to mate with astm a194 grade 2h heavy hex. Two other common symbols that are included on metric parts are the s. Astm a325 covers high strength structural bolts used in structural steel connections.
Structural bolts are commonly used in structural steel joint situations in heavy construction. A325 bolts from glaser and associates are available in two grades, type 1 and type 3, offering different mechanical and chemical properties for specific applications. The metric grades are made to the same strength specifications as astm f568m property class 10. The second figure signifies that the fastener will begin to yield at 80% of the ultimate tensile strength, i. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. These types of bolts are designed to be tightened close to their proof strength, in order to create significant bolt tension. A325 bolts atlanta rod and manufacturing astm bolts. Note 2bolts are sometimes detailed with names such as a325 hs, a325 sc, a325 x or a490 n. Below are the chemical and mechanical requirements per the astm a325 specification.
Proof load is defined as the maximum tensile force that can be applied. Astm a490 covering imperial sized high tensile bolting and a490m for metric sized bolts. A wide variety of astm a325 high strength structural bolt options are available to you, such as gb. We are choosing to keep this technical information about the now obsolete a325 specification on our.
A307 vs a325 bolt structural engineering general discussion. Astm a325 04 standard specification for structural bolts. Portland bolt is able to manufacture headed anchor bolts in astm a449. Astm a320 l7 stud bolts are specially engineered for. A449 is an appropriate anchor bolt specification when a project requires a bolt to be stronger than f1554 grade 55 and not as strong as f1554 grade 105. These types of bolts are designed to be tightened to near their proof strength, in order to create significant bolt tension. These names relate to connection design and bolt installation, but do not change the manufacturing requirements and are preferably not shown on bolt orders. The maximum load in tension pulling apart which a material can withstand before breaking or fracturing. The party responsible to ensure that the contractor has satisfied the provisions of this specification in the work. This specification is a consolidation of and replacement for six astm standards ranging from 12.
Astm a490 and astm a490m are astm international standards for heavy hex structural bolts made from alloy steel. Astm a325 has a longer shank and only about 2 inches of threading, compared to a394, which is threaded the length of the bolt. The imperial grades are made to the same strength specifications as astm a354 grade bd. Astm a490 bolts are intended for used in structural connections similar to astm a325 a325m but being produced from alloy steel instead of medium carbon steel, possed high tensile strength. This specification contains 4 inch series bolting grades.
A medium carbon steel commonly used in structural connections. The maximum load in tension pulling apart which a material can. The physical difference is the bolt head dimensions. An astm a325 or a490 bolt, an astm f1852 twistofftype tensioncontrol bolt or an alternativedesign fastener that meets the requirements in section 2. Fastener specifications astm a193, a320, a307, a325, a593. Astm a193 grade b7 chromium molybendum steel, normally aisi 4140, heat treated to 2832rockwell hardness, 125,000 psi tensile strength, 105, 000 psi yield. Grade a325 can be made of type 1 medium carbon steel or type 3 weathering steel.
Hot dipped galvanized is a coating for very good corrosion resistance. One thing to note is that with the implementation of astm f3125 grade a325, the mechanical properties differ slightly as indicated below. Astm a325 is the standard specification for heavy hex structural bolts in heattreated steel with a minimum tensile strength of 120105 ksi. A325 bolts have a minimum tensile strength of 120,000 psi for one inch or less diameters and 105,000 psi for over one inch. High strength hex bolt with heavy pattern head to increase the bearing surface, and distribute the clamping load over a larger area. In many but not all bolting situations, its important not to tension a bolt past its yield strength, because it no longer retains its original size and shape and ultimately its performance. They are used in structural steel joints in heavy construction applications that require greater yield and tensile strengths than those of an a325 bolt are required.
Astm a320 l7 stud bolts are specially engineered for low temperature performance. Astm a490 bolts are intended for used in structural connections similar to astm a325a325m but being produced from alloy steel instead of. 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. The equivalent metric standard is astm a325m, which is titled standard specification for structural bolts, steel, heat treated 830 mpa minimum tensile strength. Proof load, stress area, yield strength, and other data is based on ifi 7th edition 2003 technical data n68, sae j429, astm a307, a325, a354, a449, and a490. An a325 structural bolt uses the same material as most common bolts, but have a thicker and wider head to more effectively distribute the load. Astm a490 bolts are heavy hex bolts made of alloy steel with a flat bearing surface, washer faced, and chamfered point. This specification covers two types of bolting grades quenched and tempered, manufactured from high strength alloy steel. The astm a325 specification covers high strength heavy hex structural bolts from 12 diameter through 112 diameter.
Type 3 is a quenched and tempered weathering steel bolting material with minimum tensile requirement of 105 ksi, yield 81 ksi and maximum hardness requirement of 34 hrc. The imperial standard is officially titled standard specification for structural bolts, alloy steel, heat treated, 150 ksi minimum tensile strength, while the metric standard m is titled standard specification for high strength steel bolts, classes 10. Grade a325 bolts are available in diameters from 12 to 112 inch for diameters greater than 112, astm a449 specifications should be considered with a minimum tensile strength of 120,000 psi. Its virtually identical in terms of chemical and physical strengths and properties as an sae grade 5. Astm a490m type 3 12mm to 36mm nominal size, 830 proof strength mpa, 940 minimum yield strength mpa, 1040 minimum tensile strength mpa, c3339 core hardness rockwell glaser bolt a490 products meet these industry specifics and are certified for use in structural applications. The a394t1 and t0 has the smaller head while a325 has the larger bolt head. Two other common symbols that are included on metric parts are the s and the 3 designations. Material type 1 bolts shall be made from an alloy steel which conforms to the following chemical composition requirements. Properties astm a325 a325 structural bolts astm a325. An axial tensile load which the product must withstand without evidence of any permanent set. Astm a325 is an astm international standard for heavy hex structural bolts, titled standard specification for structural bolts, steel, heat treated, 120105 ksi minimum tensile strength. Standard specification for structural bolts, alloy steel, heattreated.
The difference between f3125 a325 and f3125 a490 structural bolts. The standard states in which the bolts must be tightened to are at least 70% of their tensile strength. Call or email us lightning bolt and supply today, where our fastener experts can meet all of your fastener needs any fasteners any material. Strength properties specifications for steel bolts. The a394t0 is a regular strength bolt iirc it is comparable to a307 while the a394t1 is a high strength and more expensive bolt that is the same strength shear anyway as a a325 bolt. Standard specification for structural bolts, steel, heattreated.
Unlike other astm grades, a325 is specific not only in the chemical and mechanical requirements, but also in the allowed. The imperial standard is officially titled standard specification for structural bolts, alloy steel, heat treated, 150 ksi minimum tensile strength, while the metric standard m is titled standard specification for highstrength steel bolts, classes 10. At certain temperature range, these astm a325 carbon steel bolts exhibit brittleness. This bolt is an astm specification bolt thats readily available in many home improvement and automotive stores. A325 04 standard specification for structural bolts, steel, heat treated, 120105 ksi minimum tensile strength, bolts, carbon steel, steel, structural, weathering steel. The yield strength of a bolt can be defined as the tensile force that will produce a certain amount of permanent deformation within a specific fastener. Available in type 1 and type 3 type 2 was withdrawn from the standard in 1991. This is a quenched and tempered bolt made from alloy steel and heat treated to the required strength.
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