B18.24.1Part Identifying Number(PIN)Code System10 2.3Military Standard:
MIL-STD105Single Sampling Plan for Normal Inspec-tion11
3.Ordering Information
3.1Orders for externally threaded fasteners(including nuts and accessories)under this specification shall include the following:
3.1.1ASTM designation and year of issue,
3.1.2Name of product,bolts or studs;and bolt head style, that is,hex or heavy hex,
3.1.3Grade,that is,A,or B,or C.If no grade is specified, Grade A is furnished.
3.1.4Quantities(number of pieces by size including nuts), 3.1.5Fastener size and length,
3.1.6Washers—Quantity and size(parate from bolts), 3.1.7Zinc Coating—Specify the zinc-coating process re-quired for example,hot-dip,mechanically deposited or no preference(e
4.5).
3.1.8Other Finishes—Specify other protectivefinish,if required.
3.1.9Specify if inspection at point of manufacture is re-quired,
经验交流会3.1.10Specify if certified test report is required(e8.2), and
3.1.11Specify additional testing(8.3)or special require-ments.
3.1.12For establishment of a part identifying system,e ASME B18.2
4.1.
4.Materials and Manufacture
4.1Steel for bolts and studs shall be made by the open-hearth,basic-oxygen,or electric-furnace process.
4.2Bolts shall be produced by hot or cold forging of the heads or machining from bar stock.
4.3Heat Treatment:
4.3.1Cold headed fasteners with head configurations other than hex shall be stress relief annealed.
4.3.2Stress relieving of hex head fasteners shall be at the manufacturer’s option.
4.4Bolt and stud threads shall be rolled or cut.
4.5Zinc Coatings,Hot-Dip and Mechanically Deposited: 4.
5.1When zinc-coated fasteners are required,the pur-char shall specify the zinc-coating process,for example hot dip,mechanically deposited,or no preference.
4.5.2When hot-dip is specified,the fasteners shall be zinc-coated by the hot-dip process in accordance with the requirements of Class C of Specification A153.
4.5.3When mechanically deposited is specified,the fasten-ers shall be zinc-coated by the mechanical-deposition process in accordance with the requirements of Class50of Specifica-tion B695.
4.5.4When no preference is specified,the supplier may furnish either a hot-dip zinc coating in accordance with Specification A153,Class C or a mechanically deposited zinc coating in accordance with Specification B695,Class50. Threaded components(bolts and nuts)shall be coated by the same zinc-coating process and the supplier’s option is limited to one process per item with no mixed process in a lot. 5.Chemical Composition
5.1Grade A and B bolts and studs shall have a heat analysis conforming to the requirements specified in Table1bad on the steel producer’s heat analysis.
5.2The purchar shall have the option of conducting product analys onfinished bolts in each lot,which shall conform to the product analysis specified in Table1.
5.3In ca of conflict or for referee purpos,the product analysis shall take precedence.
5.4Bolts and studs are customarily furnished from stock,in which ca individual heats of steel cannot be identified.
5.5Application of heats of steel to which bismuth,le-nium,tellurium,or lead has been intentionally added shall not be permitted for Grade B bolts and studs.
5.6Chemical analys shall be performed in accordance with Test Methods,Practices,and Terminology A751.
6.Mechanical Properties
6.1Grades A and B bolts and studs shall conform to the hardness specified in Table2.
6.2Grade A and B bolts and studs1½in.in diameter or less, other than tho excepted in6.4,shall be tested full size and shall conform to the requirements for tensile strength specified in Table3.
6.3Grade A and B bolts and studs larger than1½in.in diameter,other than tho excepted in6.4,shall preferably be tested full size and when equipment of sufficient capacity is available and shall conform to the requirements for tensile strength specified in Table3.When equipment of sufficient capacity for full-size bolt testing is not available,or when the length of the bolt makes full-size testing impractical,machined specimens shall be tested and shall conform to the require-ments specified in Table4.
6.4Grades A and B bolts and studs less than three diameters in length or bolts with drilled or undersize heads are not subject to tensile tests.
6.5Grade C nonheaded anchor bolts shall be tested using machined specimens and shall conform to the tensile properties specified for bars in Specification A36.Properties are shown in Table4for information.In the event of conflict Specification A36shall control.
10Available from American Society of Mechanical Engineers,Three Park Avenue,New York,NY10016–5990.
11Available from Standardization Documents Order Desk,Bldg.4Section D, 700Robbins Ave.,Philadelphia,PA19111-5094,Attn:NPODS.
TABLE1Chemical Requirements for Grades A and B Bolts and
Studs
Heat Analysis Product Analysis Carbon,max0.290.33 Mangane,max0.900.93 Phosphorus,max0.040.041
Sulfur,max
Grade A0.15A
Grade B0.050.051
A Resulfurized steel is not subject to rejection bad on product analysis for
sulfur.
6.6In the event that bolts are tested by both full size and by machine test specimen methods,the full-size test shall govern if a controversy between the two methods exists.
6.7For bolts and studs on which both hardness and tension tests are performed,acceptance bad on tensile requirements shall take precedence in the event that there is controversy over low readings of hardness tests.
7.Dimensions
7.1Unless otherwi specified,threads shall be the Coar Thread Series as specified in the latest issue of ANSI/ASME B1.1,and shall have a Class2A tolerance.
怎样写委托书
7.2Unless otherwi specified,Grade A bolts shall be hex bolts with dimensions as given in the latest issue of ANSI/ ASME B18.2.1.Unless otherwi specified,Grade B bolts shall be heavy hex bolts with dimensions as given in the latest issue of ANSI/ASME B18.2.1.
7.3Unless otherwi specified,bolts and studs to be ud with nuts or tapped holes which have been tapped oversize,in accordance with Specification A563,shall have Class2A threads before hot-dip or mechanically deposited zinc coating. After zinc coating the maximum limit of pitch and major diameter shall not exceed the Class2A maximum limit by more than the following amounts:
猪肉炖粉条Diameter,in.Oversize Limit,in.(mm)A
¼0.016台湾媒体
5/16,"0.017
7/16,½0.018
9/16to¾incl0.020
$0.022
1.0to1¼incl0.024
1",1½0.027
1¾to4.0incl0.050
A The values are the same as the overtapping required for zinc-coated nuts in Specification A563.
7.4The gaging limit for bolts and studs shall be verified during manufacture or u by asmbly of a nut tapped as nearly as practical to the amount oversize shown above.In ca of dispute,a calibrated thread ring gage of that same size (Class X tolerance,gage tolerance plus)shall be ud.Asm-bly of the gage,or the nut described above,must be possible with hand effort following application of light machine oil to prevent galling and damage to the gage.The inspections, when performed to resolve disputes,shall be performed at the frequency and quality described in Table5.
8.Number of Tests and Retests
8.1The requirements of this specification shall be met in
TABLE2Hardness Requirements for Bolts and Studs
Grade Length,in.
Hardness A
工作证明信Brinell Rockwell B min max min max
A Less than33dia B12124169100
33dia 241 (100)
B Less than33dia B1212126995
33dia 212 (95)
C All No hardness required
A As measured anywhere on the surface or through the cross ction.
B Also bolts with drilled or undersize heads.The sizes and bolts with modified heads shall meet the minimum and maximum hardness as hardness is the only requirement.
TABLE3Tensile Requirements for Full-Size Bolts and Studs
Bolt Size, in.Threads
per inch
Stress
Area,A
in.2
Tensile Strength,lbf B
Grade
A,min C
Grade B
min D max D
1⁄4200.0318190019003180 5⁄16180.0524310031005240 3⁄8160.0775465046507750 7⁄16140.10636350635010630
1⁄2130.14198500850014190 9⁄16120.182110001100018200 5⁄8110.226135501355022600 3⁄4100.334200502005033400 7⁄890.462277002770046200
180.606363503635060600 11⁄870.763458004580076300 11⁄470.969581505815096900 13⁄86 1.1556930069300115500 11⁄26 1.4058430084300140500 13⁄45 1.90114000114000190000 24½ 2.50150000150000250000 21⁄44½ 3.25195000195000325000
21⁄24 4.00240000240000400000 23⁄44 4.93295800295800493000 34 5.97358200358200597000 31⁄447.10426000426000710000 31⁄248.33499800499800833000 33⁄449.66579600579600966000 4411.086648006648001108000 A Area calculated from the equation:
A s50.7854[D−(0.9743/n)]2
where:
A s5stress area,
D5nominal diameter of bolt,and
n5threads per inch.
B1lbf54.448N.
C Bad on60ksi(414MPa).
D Bad on60–100ksi(414–690MPa).
TABLE4Tensile Requirements for Machined Specimens
Grade A Grade B Grade C Tensile strength,ksi
(MPa)
60(415)min60–100(415–690)58–80(400–550)
Yield point,min ksi
(MPa)
......36(50)
Elongation in2in.
(50mm),min,%
181823
TABLE5Sample Sizes and Acceptance Numbers for Inspection of Hot-Dip or Mechanically Deposited Zinc-Coated Threads
Lot Size Sample Size A,B Acceptance Number A
2to90131
91to150202
151to280323
281to500505
501to1200807
1201to320012510
3201to1000020014
10001and over31521
A Sample sizes of acceptance numbers are extracted from
“Single Sampling Plan for Normal Inspection,”Table IIA,MIL-STD-105.
B Inspect all bolts in the lot if the lot size is less than the sample size.
continuous mass production for stock,and the manufacturer shall make sample inspections to ensure that the product conforms to the specified requirements.Additional tests of individual shipments of material are not ordinarily contem-plated.Individual heats of steel are not identified in thefinished product.
8.2When specified in the order,the manufacturer shall furnish a test report certified to be the last completed t of mechanical tests for each stock size in each shipment.
8.3When additional tests are specified on the purcha order,a lot,for purpos of lecting test sam
ples,shall consist of all material offered for inspection at one time that has the following common characteristics:
8.3.1One type of item,
8.3.2One nominal size,and
8.3.3One nominal length of bolts and studs.
8.4From each lot,the number of tests for each requirement shall be as follows:
Number of Pieces in Lot Number of Samples
800and under1
801to80002
8001to220003
Over220005
8.5If any machined test specimen shows defective machin-ing it shall be discarded and another specimen substituted. 8.6Should any sample fail to meet the requirements of a specified test,double the number of samples from the same lot shall be tested,in which ca all of the additional samples shall meet the specification.
樱花七日9.Test Methods
9.1Grades A and B bolts and studs shall be tested in accordance with Test Methods F606.
9.2Grade C nonheaded anchor bolts shall have machined specimen tension tests made on the bolt body or on the bar stock ud for making the anchor bolts.Tests onfinished anchor bolts shall be made in accordance with Test Methods F606and tests on bar stock in accordance with Specification A36and Test Methods A370.
9.3Standard square and hex head bolts only shall be tested by the wedge tension method except as noted in6.4.Fracture shall be in the body or threads of the bolt without any fracture at the junction of the head and body.Other headed bolts shall be tested by the axial tension method.
9.4Speed of testing as determined with a free running crosshead shall be a maximum of1in.(25.4mm)/min for the tensile strength tests of bolts.
10.Inspection
10.1If the inspection described in10.2is required by the purchar it shall be specified in the inquiry,order,or contract.
10.2The inspector reprenting the purchar shall have free entry to all parts of the manufacturer’s works that concern the manufacture of the material ordered.The manufacturer shall afford the inspector all reasonable facilities to satisfy him that the material is being furnished in accordance with this specification.All tests and inspections required by the specifi-cation that are requested by the purchar’s reprentative shall be made before shipment,and shall be conducted as not to interfere unnecessarily with the operation of the works.11.Responsibility
11.1The party responsible for the fastener shall be the organization that supplies the fastener to the purchar and certifies that the fastener was manufactured,sampled,tested and inspected in accordance with this specification and meets all of its requirements.
12.Rejection and Rehearing
12.1Disposition of nonconforming lots shall be in accor-dance with Guide F1470,specifically ctions on disposition of nonconforming lots,suppliers option,and purchars option.
13.Product Marking
13.1Grades A and B Bolts and Studs:
13.1.1Bolt heads and one end of studs shall be marked with
a unique identifier by the manufacturer to identify the manu-facturer or private label distributor,as appropriate.Additional marking required by the manufacturer for his own u shall be at the option of the manufacturer.
13.1.2In addition to the requirements of13.1,all bolt heads, one end of studs"in.and larger,and whenever feasible studs less than"in.shall be marked with a grade marking as follows:
Grade Marking
A
B
307A
307B
13.1.3All markings shall be located on the top of the bolt head or stud end and shall be raid or depresd at the option of the manufacturer.
13.2Grade C Anchor Bolts:
13.2.1The end of Grade C anchor bolts intended to project from the concrete shall be color coded green.
13.2.2When permanent marking of manufacturer’s identi-fication and grade identification is required,Supplementary Requirements S2and S3shall be specified.
13.3Grade and manufacturer’s or private label distributor’s identification shall be parate and distinct.The two identifi-cations shall preferably be in different locations and,when on the same level,shall be parated by at least two spaces. 14.Packaging and Package Marking
14.1Packaging:
14.1.1Unless otherwi specified,packaging shall be in accordance with Practice D3951.
14.1.2When special packaging requirements are required, they shall be defined at the time of the inquiry and order. 14.2Package Marking:
14.2.1Each shipping unit shall include or be plainly marked with the following information:
14.2.1.1ASTM designation and grade,
14.2.1.2Size,
14.2.1.3Name and brand or trademark of the manufacturer, 14.2.1.4Number of pieces,
14.2.1.5Purcha order number,
14.2.1.6Country of origin.
15.Keywords
15.1bolts;carbon steel;steel;
studs
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirement shall apply only when specified in the purcha order or
contract:
S1.Bolts Suitable for Welding
S1.1The material described in this ction is intended for
welding.This supplemental ction,by additional chemical
composition restrictions and by a carbon equivalent formula,
provides assurance of weldability by chemical composition
control.
S1.2Welding technique is of fundamental importance when马日拉
bolts produced to this supplementary ction are welded.It is
presuppod that suitable welding procedures for the steel
转瞬即逝的近义词being welded and the intended rvice will be lected.
S1.3All of the requirements of this supplemental ction
apply in addition to all of the chemical,mechanical,and other
requirements of the ba specification,Specification A 307for
Grade B.
S1.4Becau of the embrittling effects of welding tempera-
tures on cold-forged steel,this supplemental ction is limited
to hot-forged bolts,or,if not forged,then to bolts produced
from hot-rolled bars without forging or threaded bars,bars
studs,or stud bolts produced from hot-rolled bars without
forging.Cold-forged bolts,or cold-drawn threaded bars,if they
are given a thermal treatment by heating to a temperature of not
less than 1500°F (815°C)and air-cooled are also suitable.
S1.5Chemical Requirements:
S1.5.1Heat Chemical Analysis —Material conforming to
the following additional analysis limitations shall be ud to
manufacture the product described in this supplementary
requirement.
Carbon
0.30%,max Mangane
1.00%,max Phosphorus
0.04%,max Sulfur
0.05%,max Silicon 0.50%,max S1.5.2Carbon Equivalent (Source—Specification A 706/
A 706M)—In addition to the heat chemical analysis require-ments in S1.5.1,the heat analysis shall be such as to provide a carbon equivalent (CE)not exceeding 0.55when calculated as follows:CE 5%C +%Mn 61%Cu 401%N 1201%Cr 102%Mo 502%V 10S1.6Analysis Reports —If requested on the order or con-tract,the chemical composition of each heat of steel ud and the calculated carbon equivalent for each heat shall be reported to the purchar.S1.7Product (Check)Verification Analysis —Chemical analys when made by the purchar or a reprentative on bolts from each heat of steel,shall not exceed the values specified in S1.5.2by more than the following amounts:%Carbon +0.03Mangane +0.06Phosphorus +0.008Sulfur +0.008Silicon +0.05S2.Permanent Manufacturer’s Identification S2.1The end of the anchor bolt intended to project from the concrete shall be steel die stamped with the manufacturer’s identification.N OTE —For marking small sizes,customarily less than "in.,consult the anchor bolt manufacturer for the minimum size capable of being marked.
S3.Permanent Grade Identification S3.1The end of the anchor bolt intended to project from the concrete shall be steel die stamped with the Grade identifica-tion “307C”.S3.2The requirements in S2.1for marking small sizes shall also apply to Supplementary Requirement S3.
SUMMARY OF CHANGES
This ction identifies the location of lected changes to this standard that have been incorporated since the –97issue.For the convenience of the ur,Committee F16has highlighted tho changes that impact the u of this standard.This ction may also include descriptions of the changes or reasons for the changes,or both.
(1)Added 3.1.12,providing for optional u of ASME
B18.24.1,Part Identifying Number (PIN)Code
System.
