CarbonSteelBolts Studs andThreadedRod60000PSl StandardSpecificationfor TensileStrength1
This standard is issued under the fixed designation A307; the nember immediately following the designation indicates the year ofoeiginal adoption ot in the case of revision the year of last revision. A number in parentheses indicates the year of last resuppeoval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standnd hs bem approed for ase br agencier ef the U.S. Deprmenr ef Dfene.
NOTESection 7.3 was editorilly corected in May 2017.
1. Scope*
Nuts of ther grades nd styleshaing speied prooflod streses Specifiction A563 Table 3) greater than the specifed grade and style of nut are also sutable.
1.1 This specification² covers the chemical and mechanicalrequirements of two grades of carbon steel bolts and studs insizes % in. through 4 in. The fasteners are designated by “"Grade” denoting tensile strength and intended use as follows:
as standard. No other units of measurement are included in this 1.4 The values stated in inch-pound units are to be regardedstandard.
Grade DescriptionGrade A Bols studs and threaded rod having a minimumtensile strength of 60 ksi and intended for general spplicatio Grade B Bolts studs and threaded rod* hsving a tensiestrengh of60 to 100ksiand inendedforflngedjointsinGrade C piping syslems with cast iron Replaced by Speitiatin flanges andF1554 Gr.36
provided which describes aditional restrictions to be applied 1.5 Supplementary Requirement S1 of an optional nature isps u o dde s pm q oae soq in the inquiry order and contract.
1.6 Terms used in this specification are defined in Termi-nology F1789 unless otherwise defined herein.
dance with internarionally recognized principles on standard- 1.7 This international standard was developed in accor-ization established in the Decision on Principles for the Development of Internarional Standards Guides and Re-mendations issued by the Worid Trade Organization Techunical Barriers to Trade (TBT) Commiltee.
^Thraded rod is nct usually prduced to Grade B but can be when specified by the purchaser.
machine screws thread cutting/forming screws mechanical 1.2 This specification does not cover requirements forexpansion anchors or similar externally threaded fasteners.
2. Referenced Documents
2.1 ASTM Standards:?
otherwise specified the grade and style of nut for each grade of 1.3 Suitable nuts are covered in Specification A563. Unlessfastener of all surface finishes shall be as follows:
A563 Specification for Carbon and Alloy Steel Nuts A706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete ReinforcementA751 Test Methods Practices and Terminology for Chemi- cal Analysis of Steel ProductsB695 Specification for Coatings of Zinc Mechanically De- posited on Iron and SteelF606 Test Methods for Determining the Mechaniecal Proper- ties of Extermally and Internally Threaded Fasteners Washers. and Rivets (Metric) F0606_F0606M
Fastener Grade and Size A %s to 11s in. A over 1% to 4 in.B 14 to 4 in.
3.Ordering Information
4. Materials and Manufacture
4.3 Heat Trearonent:
F788/F788M Specification for Surface Discontinuities of Bolts. Serews and Studs Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me- chanical Properties and Performance Inspection F1554 Specification for Anchor Bolts Steel 36 55 and 105-ksi Yield StrengthF1789 Terminology for F16 Mechanical Fasteners F2329 Specification for Zine Coating Hot-Dip Require-ments for Application to Carbon and Alloy Steel Bolts.2.2 ASME Standards: Screws Washers Nuts and Special Threaded FastenersB 1.1 Unified Serew Threads* B 18.2.1 Square and Hex Bolts and Screws*B 18.24 Part Identifying Number (PIN) Code System B18.31.3 Threaded Rods (Inch Series)*
3.1 Orders for externally threaded fasteners (including nuts
following: and accessories) under this specification shall include the3.1.1 ASTM designation and year of issue that is hex or heavy hex or threaded rod 3.1.2 Name of product bolts or studs; and bolt head style A is furnished. 3.1.3 Grade that is A or B. If no grade is specified Grade3.1.5 Fastener size and length 3.1.4 Quantities (number of pieces by size including nuts) 3.1.6 WushersQuantity and size (separate from bolts) required for example hot-dip mechanically deposited or no 3.1.7 Zinc CoaringSpecify the zinc-coating processpreference (see 4.5). 3.1.8 Orher Finishes-Specify other protective finish ifrequired. 3.1.9 Specify if inspection at point of manufacture isrequired and 3.1.10 Specify if certified test report is required (see 9.2) ments. 3.1.11 Specify additional testing (9.3) or special require-3.1.12 For establishment of a part identifying system seeASME B18.24.
4.1 Steel for bolts studs and threaded rod shall be made bythe open-hearth basic-oxygen or electric-furnace process.
heads or machining from bar stock. 4.2 Bolts shall be produced by hot or cold forging of the
than hex having a minimum head height less than or equal to 4.3.1 Cold headed fasteners with head configurations other a minimum temperature of 875°F. .5 D (D is nominal diameter) shall be stress relief annealed at
4.3.2 Stress relieving of hex head fasteners and those withminimum head heights greater than .5 D shall be at themanufacturer's option.
4.4 Bolt and stud threads shall be rolled or cut.
4.5 Zinc Cootings Hot-Dip and Mechanically Deposited:
chaser shallspecify the zinc-coating process for example hot 4.5.1 When zinc-coated fasteners are required the pur-dip. mechanically deposited or no preference.
4.5.2 When hot-dip is specified the fasteners shall berequirements of Specification F2329. zinc-coated by the hot-dip process in accordance with the
4.5.3 When mechanically deposited is specified the fasten-in accordance with the requirements of Class 55 of Specifica- ers shall be zinc-coated by the mechanical-deposition processtion B695.
sns s s d ou sSpecification F2329 or a mechanically deposited zinc coating furmish either a hot-dip zinc coating in accordance within accordance with Specification B695 Class 55. Threadedponents (bolts and nuts) shall be coated by the same zinc-coating process and the supplier’s option is limited to oneprocess per item with no mixed processes in a lot.
5. Chemical Composition
a heat analysis conforming to the requirements specified in 5.1 Grade A and B bolts studs and threaded rod shall haveTable I based on the steel producer’s heat analysis.
5.2 The purchaser shall have the option of conductingproduct analyses on finished bolts in each lot which shallconform to the product analysis specified in Table 1.
5.3 In case of conflict or for referee purposes the productanalysis shall take precedence.
which case individual heats of steel cannot be identified. 5.4 Bolts and studs are customarily furmished from stock in
5.5 Application of heats of steel to which bismuth not be permitted for Grade B bolts and studs. selenium tellurium or lead has been intentionally added shall
5.6 Chemical analyses shall be performed in accordancewith Test Methods Practices and Terminology A751.
6. Mechanical Properties
6.1 Grades A and B bolts studs and threaded rod shallconform to the hardness specified in Table 2.
diameter or less other than those excepted in 6.4 shall be 6.2 Grade A and B bolts studs and threaded rod 1% in. in
Studs and Threaded Rod
TABLE 1 Chemical Requirements for Grades A and B Bolts
Carbon max Heat Analysis 0.29 Product AnalysisPhosphonus.max Manganese max 0.04 1.20 0.041 1.25 0.33Sulfur max Grade A 0.15 AGrade B 0.05 0.051
Resuurds n ujtorjtin baednpt anis fu.
TABLE 2 Hardness Requirements for Bolts Studs and Threaded Rod
TABLE 3 Tensile Requirements for FullSize Bolts Studs andThreaded Rod
Grade HardhessLength in. Nominal Brinell Rockwell Bmin m8x min maxA Ls hn3 x d puep x 121 241 69 100B Lessthan3 × da 3 × dia and longer 121 241 212 212 69 100 95 95
Sress Tensile Strength IbSize Bolt in. per inch A min c Grade Grade Bmin? max% 20 18 0.0524 0.0318 3100 1900 1900 3100 3180 5 240% 16 14 0.0775 0.1063 4650 6 350 4 650 6 360 10 630 775013 12 0.182 0.1419 11 000 8 500 11 000 8500 14 190 18 200% % 11 10 0.226 0.334 20 050 13 550 20 050 13 550 22 600 00 CC1 % 9 00 0.462 0.606 27 700 36 350 27 700 36 350 60 600 46 2001% 136 7 7 0.763 0.969 45 800 58 150 45 800 58 150 000 94 96 90013 1 6 1.156 69 300 69 300 115 5001% 2 4% 5 6 1.90 2.50 1.405 150 000 114 000 84 300 114 000 150 000 84 300 140 500 190 000 250 000214 4% 3.25 195 000 195 000 325 0002% 2% 4 4 4.00 4.93 240 000 295 800 240 000 295 800 400 000 493 0003 31 4 4 5.97 7.10 358 200 426 000 358 200 426 000 597 000 710 0003 3% 4 4 9.66 8.33 499 800 579 600 579 600 499 800 833 000 966 0004 4 11.08 664 800 664 800 1108 000
As messured anywhere on the surlace or through the cross section. p spe susopnpmsqheads shall meet the minimum and maximum hardness ss hardness is the only requirement.
tested full size and shall conform to the requirements fortensile strength specified in Table 3. Threaded rod is permitted to becut to a length suitable for tensile testing and shallbe treatedusing the same method specified for studs.
6.3 Grade A and B bolts studs and threaded rod larger thanpreferably be tested fullsize and when equipment of suficient 11 in. in diameter other than those excepted in 6.4 shallcapacity is available and shall conform to the requirements fortensile strength specified in Table 3. When equipment of sufficient capacity for full-size testing is not available or whenthe length of the bolt or stud makes full-size testing impractical machined specimens shall be tested and shallconform to the requirements specified in Table 4.
^ Area calculated from the equafos:where: A = 0.7854 [0 (0.9743/r)]
in nominal length or bolts with drilled or undersize heads are 6.4 Grades A and B bolts and studs less than three diameters not subject to tensile tests.
A.- stress are8 D= n nominal diameter of bolt and thresds per inch.
by both full size and by machine test specimen methods the 6.5 In the event that bolts studs and threaded rod are testedfull-size test shall govern if a controversy between the two methods exists.
1 Ibf = 4.448 N. C Based on 60 ksi (414 MPa).° Based on 60100 ksi (414690 MPa).
TABLE 4 Tensile Requirements for Machined Specimens
6.6 For bolts studs and threaded rod on which bothhardness and tension tests are performed acceptance based on tensile requirements shall take precedence in the event that there is controversy over low readings of hardness tests.
Grade A Grade BTensile strength ksi Yield point min ksi 60 min .. 60-100Elongation in 2 in. min % 18 18
7. Dimensions
shall be the Coarse Thread Series as specified in the latest issue 7.1 Unless otherwise specified threads on bolts and studsof ASME B1.1 and shall have a Class 2A tolerance. Unless otherwise specified threads on threaded rod shall be per therequirements of the latest issue of ASME B18.31.3.
ASME B18.2.1. Unless otherwise specified threads onthreaded rod shall be per the requirements of the latest issue ofASME B18.31.3.
7.3 Unless otherwise specified bolts studs and threadedrod to be used with nuts or tapped holes which have been tapped oversize in accordance with Specification A563 shalldeposited zinc coating. have threads as specified in 7.1 before hot-dip or mechanically
bolts with dimensions as given in the latest issue of ASME 7.2 Unless otherwise specified Grade A bolts shall be hexB18.2.1. Unless otherwise specified Grade B bolts shall beheavy hex bolts with dimensions as given in the latest issue of
After zinc coating the maximum limit of pitch and majordiameter shall not exceed the Class 2A maximum limit by morethan the following amounts:
Diameter in. Oversize Ume in.455e % % 0.016 0.017 to4 ind 0.018 0.020 0.022% 1.0 to 134 incl 1% 11/ 0.024 0.0271% to 4.0 incl 0.050
Thee th ate ertspinqired fines i Specification A563.
shall be verified during manufacture or use by assembly of a 7.4 The gaging limit for bolts and studs and threaded rodnut tapped as nearly as practical to the amount oversize shownabove. In case of dispute a calibrated thread ring gage of that same size (Class X tolerance gage tolerance plus) shall beused. Assembly of the gage or the nut described above must be possible with hand effort following application of lightinspections when performed to resolve disputes shall be machine oil to prevent galling and damage to the gage. Theseperformed at the frequency and quality described in Table 5.
8. Workmanship Finish and Appearance
shall be in accordance with Specification F788/F788M. 8.1 Surface discontinuity limits inspection and evaluation
9. Number of Tests and Retests
9.1 The requirements of this specification shall be met incontinuous mass production for stock and the manufacturer shall make sample inspections to ensure that the productconforms to the specified requirements. Additional tests of individual shipments of material are not ordinarily contem-product. plated. Individual heats of steel are not identified in the finished
9.2 When specified in the order the manufacturer shallfurnish a test report certified to be the last pleted set ofmechanical tests for each stock size in each shipment.
9.3 When additional tests are specified on the purchaseorder a lt for purposes of seleting test samles shall consist of all material offered for inspection at one time that has thefollowing mon characteristics:
9.3.2 One nominal size and 9.3.1 One type of item
TABLE 5 Sample Sizes and Acceptance Numbers for Inspectionof Hot-Dip or Mechanically Deposited Zinc-Coated Threads
Sample SizedLot Size Acceptance Number151 to 280 91 to 150 2 to 90 20 13 1 2501 to 1 200 281 to 500 32 80 50 33 201 to 10 000 1 201 to 3 200 200 125 14 1010 001 and over 315 21
Inspect all bolts in the lot i the lot size is less han the sample sizs.
9.3.3 One nominal length of bolts and studs.
9.4 From each lot the number of tests for each requirementshall be as follows:
Number of Pieces in Lot800 and under 801 to 8 000 Number of Samples 1 28 001 to 22 000 Over 22 000 5
sns uds oe pe ppess sq us n s 9.5 If any machined test specimen shows defective machin-
9.6 Should any sample fail to meet the requirements of ashall be tested in which case all of the additional samples shall specified test double the number of samples from the same lotmeet the specification.
10. Test Methods
accordance with Test Methods F606. 10.1 Grades A and B bolts and studs shall be tested in
10.2 Standard square and hex head bolts only shall be testedby the wedge tension method except as noted in 6.4. Fracture shall be in the body or threads of the bolt without any fractureat the junction of the head and body. Other headed bolts shall be tested by the axial tension method.
11. Inspection
11.1 If the inspection described in 11.2 is required by thepurchaser it shall be specified in the inquiry order or contract.
11.2 The inspector representing the purchaser shall havefree entry to all parts of the manufacturer’s works that concernthe manufacture of the material ordered. The manufacturer shall afford the inspector all reasonable facilities to satisfy himspecification. All tests and inspections required by the specifi- that the material is being furmished in accordance with thiscation that are requested by the purchaser’s representative shallbe made before shipment and shall be conducted as not to interfere unnecessarily with the operation of the works.
12. Responsibility
12.1 The party responsible for the fastener shall be theorganization that supplies the fastener to the purchaser.
13. Rejection and Rehearing
13.1 Disposition of nonconforming lots shall be in accor-dance with Guide F1470 specifically sections on disposition ofnonconforming lots suppliers option and purchasers option.
14. Produet Marking
14.1 Grades A and B Bolrs and Sruds:
14.1.1 Bolt heads and one end of studs shall be marked withfacturer or private label distributor as appropriate. Additional a unique identifier by the manufacturer to identify the manu-marking required by the manufacturer shall be at the option of the manufacturer.
one end of studs % in. and larger and whenever feasible studs 14.1.2 In addition to the requirements of 14.1 all bolt heads less than % in. shall be marked with a grade marking asfollows:
MarkingA 8 Grade 307A 307B
re s eed s tthey shall be defined at the time of the inquiry and order.
15.2 Package Marking:
15.2.1 Each shipping unit shall include orbe plainly markedwith the following information:15.2.1.2 Size 15.2.1.1 ASTM designation and grade 15.2.1.3 Name and brand or trademark of the manufacturer 15.2.1.4 Number of pieces 15.2.1.5 Purchase order number (when specified in theorder)
head or stud end and shall be raised or depressed at the option 14.1.3 All markings shall be located on the top of the bolt of the manufacturer.
14.2 Grades A and B Threaded Rod:
14.2.1 Refer to ASME B18.31.3 for marking of Grade A andB threaded rod.
ends of the threaded rod and shall be raised or depressed at the 14.2.2 If markings are required they shall be located on theoption of the manufacturer.
15.2.1.6 Country of origin.
15. Packaging and Package Marking
15.1 Packaging:
16. Keywords
15.1.1 Unless otherwise specified packaging shall be inaccordance the manufacturer’s practice to prevent damage before and during shipment.
rod 16.1 al thread rod; bolts; carbon steel; steel; studs; threaded
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirement shall apply only when specified in the purchase order orcontract:
S1. Bolts Suitable for Welding
S1.5.2 Carbon Equivalent (SourceSpecification A706/ments in S1.5.1 the heat analysis shall be such as to provide a A706M)In addition to the heat chemical analysis require-follows: carbon equivalent (CE) not exceeding 0.55 when calculated as
welding. This supplemental section by additional chemical S1.1 The material described in this section is intended forposition restrictions and by a carbon equivalent formula control. provides assurance of weldability by chemical position
bolts produced to this supplementary section are welded. It is S1.2 Welding technique is of fundamental importance whenpresupposed that suitable welding procedures for the steelbeing welded and the intended service will be selected.
S1.6 Anolysis Reports-If requested on the order orcontract the chemical position of each heat of steel used and the calculated carbon equivalent for each heat shall bereported to the purchaser.
S1.3 All of the requirements of this supplemental sectionrequirements of the base specification Specification A307 for apply in addition to all of the chemical mechanical and otherGrade B.
S1.7 Producr (Check) Verification AnalysisChemicalanalyses when made by the purchaser or a representative onbolts from each heat of steel shall not exceed the values specified in S1.5.2 by more than the following amounts:
S1.4 Because of the embrittling effects of welding tempera-tures on cold-forged steel this supplemental section is limited to hot-foged bolts or if not forged then to bolts producedfrom hot-rolled bars without forging or threaded bars barsstuds or stud bolts produced from hot-rolled bars without forging. Cold-forged bolts or cold-drawn threaded bars if theyare given a thermal treatment by heating to a temperature of not less than 1500°F (815°C) and air-cooled are also suitable.
0.03 %0.06 0.0080.008 0.05
CarbonPhosphonus ManganeseSulfur Slicon
S1.5 Chemical Requirements:
S2. Permanent Manufacturer's Identification
S1.5.1 Hear Chersical AnailysisMaterial conforming tothe following additional analysis limitations shall be used tomanufacture the product described in this supplementary requirement.
S2.1 Replaced by Specification F1554.
S3. Permanent Grade Identification
1.00 %，max 0.30 % max0.05 % max 0.04 % max0.50 % msx
Manganese CarbonPhosphorus SulfurSilicon
S3.1 Replaced by Specification F1554.
