Abstract below is a list of fastener specifications, the product designation i. A320 a320m18 standard specification for alloysteel and stainless steel bolting for lowtemperature. In developing this information, fastenal has made a determined effort to present its contents accurately. A320 grade b8m bolts also do not require an impact test. Astm a320a320m18 standard specification for alloysteel and stainless steel bolting for lowtemperature service. Astm a320 grade l43 bolts and threaded studs are manufactured from aisi 4340 material and are also quenched and tempered. Astm bolting valvespecification temperature material a193 a320. For example, when grade l43 is specified to meet the table 2 impact energy values at. Our inventory includes astm sf593 bolts in many grades including din933 din 931 ansiasme b18. Standard bolt identification markings identification grade mark specification fastener description material nominal size range in. Astma320 standard specification for alloysteel and stainless steel bolting for lowtemperature service.
Buy a320 b8 bolts, a320 b8m bolt, astm a320 l7 flange bolts, astm a320 l7 fastener at best price in india. Size of speciment mm minimum impact value required for minimum impact value permitted for. Below is a basic summary of a few of the common grades within the astm a320 specification. We owned a position of leading manufacturer and supplier of astm a320 l7 nuts amongst clients, which are used in. C alloy steel bolting, a193 gr b7 bolts and a194 gr 2h nuts can only be used at moderate temperatures depending on the permissible differential expansion of valve design which may. Astm a320 grade l7 is a standard specification for high tensile 4140 alloy steel bolting materials, intended for use in low temperature service, covering rolled, forged or strain hardened bars, bolts, screws, studs and stud bolts. Tarq bolt is a leading manufacturer and exporter of astm a320 bolts in india. For the material to be classed as grade l7 it must have the following values. Astma320 standard specification for alloysteel and. This specification covers alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for lowtemperature service. Aisi 303 is most easily machinable steel of all austenitic grades of stainless steel. Astm a320 l7 aisi 4140 bolts, astm sa320 l7 aisi 4140 stud.
Astm a320 specification astm a320 grade l7 grade l43. Astm a320 grade b8t bolts,screws, studs for lowtemperature service 14 thru 34 over 34 thru 1. Astm a320 specification includes chemical composition, mechanical properties, dimensional reference standards, recommended nuts and washers for grades like l7, l43, b8, b8m, b8c, b8t and many others with notch. Call 2252726200 or email us lightning bolt and supply today, where our fastener experts can meet all of your fastener needs any fasteners any material. Astm a320 a320m 18 standard specification for alloy. Api specification 20e alloy and carbon steel bolting for use in the petroleum and. Grade l43 is sustained to meet the impact values at 101 degrees celsius and additional restrictions such as obtaining steel with lower s and p contents are provided.
Astm a320 grade l7 specification boltport fasteners. Grades there are several grades within the a320 specification. We stock the astm a194 grade 7 heavy hex nuts you need to complete your order. We stock a large amount of astm a320 l7 stud bolts up to 212 inches in diameter. Like the astm a193 specification, unless otherwise specified, the 8un thread series is specified on fastener larger than 1 in diameter. All material included in this chart is advisory only, and its use by anyone is voluntary. A number of other less common grades of astm a320 exist, but not covered in the description below. Govt recognised manufacturer of astm a320 grade l7 and astm a320 l7 hex bolts in india.
A wide variety of astm a320 grade l7 options are available to you, such as astm, aisi, and jis. The astm a320 specification is another popular specification used in the fastener industry. This standard is issued under the fixed designation a320a320m. Astm a320 a320m 18 standard specification for alloysteel and. Astm a320 l7m grades mandatorily goes through charpy impact test due to its low temperature service applications.
L43 bolts can be as large as 4 in diameter, whereas grade l7 does not exceed 212 diameter. Each alloy shall conform to the prescribed chemical composition requirements. Astm a320 a320m bolts manufacturer, sa320 bolts supplier in india asme, din, as, bs. Documents sold on the ansi standards store are in electronic adobe acrobat pdf format, however some iso and iec standards are available from amazon in hard copy format. American society for testing materials a 320 l7 can be designated astm a 320 gr l7. Astm a320 grade l7, a320 bolts, a320 b8 bolts, a320 b8m bolt. As you are aware, this test determines the total amount of energy that is absorbed by a material during fracture, thereby improving materials notch toughness and resistance to embrittlement. Astm a193 grade b7, astm a320 grade l7, astm a449, and astm a354 grade bc.
Astm a320 bolts, astm sa320 hex bolts, stainless steel. Choosing the correct grade depends on several factors, such as mechanical properties, lowtemperature characteristics, and service. Astm a320 aisi 4140 bolts, astm sa320 4140 hex bolts, aisi 4142 gr. The austenitic steel nuts, grade 8 and 8m are also available from stock for use on stainless steel studs and bolts. Danloc group stocks the ferritic steel nuts in grades 2h, 2hm, 7, l7, and l7m which are normally used in conjunction with grade b7, b7m, b16, l7 and l7m studs. When you need astm a320 l7 bolts fast call ameribolt, inc. Astm a320 grade l7 material is chemically equivalent to astm b638 grade 660 stainless steel alloy, also known by alloy a286 and uns s66286, heat treated to achieve properties defined in astm a453 specification. Alloysteel and stainless steel bolting materials for hightemperature service1 this standard is issued under the. Astm a193 b7b7m material in place of astm a320 l7m. Stud bolts, astm a320 sa320 grade l7, grade 7 heavy hex. A320 summary astm a320 is a fastener specification covering alloy and stainless steel bolts and threaded studs for use with flanges, valves, pressure vessels, and fittings for lowtemperature service. Astm a320 grade l7 bolts free download as word doc.
Astm a320a320m11a standard specification for alloy. This property is due to presence of sulphur in the steel composition, as the sulphur content improves machining, decreases corossion resistance although it remains good in mild environment and reduces the toughness. Several grades are covered, including both ferritic and austenitic steels designated l7, b8, etc. Astm a320 grade l43 and astm a540, grade b23 material shall be double tempered.
Astm a320 grade l7 fasteners manufacturers astm a320. L7 astm a320grade l7 bolts,screws, studs for lowtemperature service aisi 4140,4142 or 4145. Astm a320 scope this specification covers alloy steel and stainless steel bolting materials for low temperature service. Astm a320 a320m18, standard specification for alloysteel and stainless steel bolting for lowtemperature service, astm international, west conshohocken, pa, 2018. Astm a320 grade l7 chromium molybdenum alloy steel astm a320 grade l7 is a material specification chromiummolybdenum steel, used for manufacturing of bolts, studs, stud bolts and other fasteners for bolting pressure vessels, valves, flanges and fittings for various process industries across major industrial sectors in low temperature applications. There are 193 suppliers who sells astm a320 grade l7. Allpro threaded neither employs nor maintains an engineering or technica l staff, and allpro is merely supplying certain. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. See the chemical composition and physical properties of astm a320 grade l7 quenched and tempered, find alternative materials, and connect with suppliers. Astm a320 is a standard material specification covering alloy and stainless steel bolting materials for pressure vessels, valves, flanges, and fittings for low temperature services. Grade 660 fasteners are used in bolting boilers, pressure vessels, pipeline flanges and valves, intended for high temperature service. Alloysteel and stainless steel bolting for lowtemperature service1. Astm a193 grade b7 tensile and yield strength 2 12 and under tensile 125 ksi.
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