ASTM F836-2002
Designation:F836M–02
METRIC
Standard Speci?cation for
Style1Stainless Steel Metric Nuts1
This standard is issued under the?xed designation F836M;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1.Scope
1.1This speci?cation covers the chemical and mechanical requirements for stainless steel metric nuts with nominal thread diameters M1.6through M36and intended for use in engineer-ing applications requiring general corrosion resistance.
1.2Eight groups of stainless steel alloys are covered, including three austenitic(Grades A1,A2,and A4),one ferritic (Grade F1),three martensitic(Grades C1,C3,and C4),and one precipitation hardening(Grade P1).
1.3Seventeen property classes are covered,including nine austenitic,one ferritic,six martensitic,and one precipitation hardening.The property classes with the permissible alloys for each are listed in Table1.
1.4This speci?cation is based in concept and content on ISO3506.The chemical and mechanical requirements speci-?ed for all property classes,except as given in1.4.1,are essentially identical with classes of the same designation in ISO3506.
1.4.1This speci?cation includes13of the16property classes covered in ISO3506.Additionally,it includes property classes A1-70,A2–70,A4–70,A1–80,A2–80,and A4–80for products with nominal thread diameters larger than M20;and four non-ISO property classes,C1-110,C4-110,C3-120,and P1-90.
1.5Supplementary requirements of an optional nature are provided,applicable only when agreed upon between the manufacturer and the purchaser at the time of the inquiry and order.
1.6Suitable bolts,hex cap screws,and studs for use with nuts included in this speci?cation are covered by Speci?cation F738M.Unless otherwise speci?ed,all bolts,hex cap screws, and studs used with these nuts shall conform to the require-ments of Speci?cation F738M and shall be of the same alloy group.
2.Referenced Documents
2.1ASTM Standards:
A262Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels2
A342Test Methods for Permeability of Feebly Magnetic Materials3
A380Practice for Cleaning,Descaling,and Passivation of Stainless Steel Parts,Equipment,and Systems2
A493Speci?cation for Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging Wire2
A555/A555M Speci?cation for General Requirements for Stainless Steel Wire and Wire Rods2
A564/A564M Speci?cation for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes2 A582Speci?cation for Free-Machining Stainless Steel Bars2
A751Test Methods,Practices,and Terminology for Chemical Analysis of Steel Products2
D3951Practice for Commercial Packaging4
E29Practice for Using Signi?cant Digits in Test Data to Determine Conformance with Speci?cations5
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers,and Rivets[Metric]6
F738M Speci?cation for Stainless Steel Metric Bolts, Screws,and Studs6
F1470Guide for Fastener Sampling for Speci?ed Mechani-cal Properties and Performance Inspection6
2.2ISO Standard:
ISO3506Corrosion-Resistant Stainless Steel Fasteners7 2.3ASME Standards:
ASME B1.13M Metric Screw Threads—M Pro?le7 ASME B18.2.4.1M Metric Hex Nuts,Style17
1This speci?cation is under the jurisdiction of ASTM Committee F16on Fastenersand is the direct responsibility of Subcommittee F16.04on Nonferrous Fasteners.
Current edition approved April10,2002.Published May2002.Originally published as F536–https://www.wendangku.net/doc/4d6009110.html,st previous edition F836–01a.
2Annual Book of ASTM Standards,V ol01.03.
3Annual Book of ASTM Standards,V ol03.04.
4Annual Book of ASTM Standards,V ol15.09.
5Annual Book of ASTM Standards,V ol14.02.
6Annual Book of ASTM Standards,V ol01.08.
7Available from American Society of Mechanical Engineers,P.O.Box2300 Fair?eld,NJ07007-2300.
1
Copyright?ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
N OTE 1—The following ASTM standards are noted for information only as suitable sources of material for the manufacture of nuts to this speci?cation:Speci?cations A 493,A 564,and A 582.
3.Classi?cation
3.1The designation of each property class is comprised of three parts,a letter followed by a single digit,followed by either two or three digits (see Table 1).
3.1.1The letter indicates the general composition type of stainless steel:
3.1.1.1A for austenitic steels,3.1.1.2F for ferritic steels,
3.1.1.3C for martensitic steels,and
3.1.1.4P for precipitation-hardening steel.
3.1.2The ?rst digit (1,2,3,or 4)indicates the alloy group.The permissible alloys within each group are given in Table 1.3.1.3The last two or three digits (50,70,110,etc.)indicate 10%of the speci?ed nut proof load stress of the property class.3.1.4For example,Class A1-50is an austenitic steel of any one of six permitted alloys,and the manufactured nut has a proof load stress of 500
MPa.
4.Ordering Information
4.1Orders for nuts under this speci?cation shall include the following :
4.1.1Quantity (number of pieces of each item);
4.1.2Name of item (speci?c type and style,and references to dimensional standard when appropriate);4.1.3Size (nominal diameter,thread pitch);
4.1.4Property class;
4.1.5Supplementary requirements,if any (S1through S3).4.1.6Orders for nuts under this speci?cation may include the following optional requirements:4.1.6.1Forming (
5.1);
4.1.6.2Alloy condition (
5.2);
4.1.6.3Alloy selection (7.2.1and S2);4.1.6.4Test report (1
5.2);
4.1.6.5Additional testing (11.3);
4.1.6.6Corrosion resistance testing (11.2);4.1.6.7Inspection (13.1);4.1.6.8Heat number (11.1.1);4.1.6.9Certi?cation (1
5.1);
4.1.6.10Proof load testing (9.2).
4.1.7ASTM speci?cation and date of issue.When date of issue is not speci?ed,nuts shall be furnished to the latest issue.
N OTE 2—Example:10000pieces,hex nut,ASME B18.2.4.1M,M631,Class A2-70,furnish test report,ASTM F 836M –XX.
15000pieces,Hex Flange Nuts,ASME B18.2.4.4M,M831.25,
class A4-50,Supplementary Requirement S3,ASTM F 836–XX.
5.Materials and Manufacture
5.1Forming —Unless otherwise speci?ed,nuts shall be cold-formed,hot-formed,or machined,at the option of the manufacturer.
5.2Condition —Nuts shall be furnished in the condition speci?ed for the property class in Table 2.If other conditions are required,the condition and resultant mechanical properties shall be as agreed upon between the manufacturer and the purchaser.
5.3Surface Finish —Unless otherwise speci?ed,nuts shall be cleaned and descaled in accordance with Practice A 380.
6.Heat Treatment
6.1Austenitic Alloys,Grades A1,A2,and A4:
6.1.1When Condition A is speci?ed,the nuts shall be machined from annealed or solution annealed stock,thus retaining the properties of the original material,or hot formed and solution annealed.
6.1.2When Condition AF is speci?ed,the nuts,following manufacture,shall be annealed by heating to 1040630°C,at which time the chromium carbide will go into solution.The nuts shall be held for a sufficient time and then cooled at a rate sufficient to prevent precipitation of the carbide and to provide the properties speci?ed in Table 2.
6.1.3When Condition CW is speci?ed,the austenitic alloy shall be annealed as speci?ed in 6.1.1,and then cold-worked to develop the properties speci?ed in Table 2.
6.1.4When Condition SH is speci?ed,nuts shall be ma-chined from strain hardened stock.6.2Ferritic Alloys,Grade F1:
6.2.1When Condition A is speci?ed,the ferritic alloy shall be heated to a temperature of 790630°C,held for an appropriate time,and then air-cooled to provide the properties speci?ed in Table 2.
6.2.2When Condition AF is speci?ed,nuts shall be treated as speci?ed in 6.1.2.
6.3Martensitic Alloys,Grades C1,C3,and C4:
6.3.1When Condition H is speci?ed,the nuts shall be
TABLE 1Property Classes of Stainless Steel Nuts
Property Class
Permissible Alloys A1-50304,304L,305A A1-70384,18–9LW,302HQ
A1-80A2-50A2-70321,347
A2-80A4-50A4-70316,316L
A4-80F1-45430B C1-70410
C1-110C3-80431
C3-120C4-70416,416Se
C4-110P1-90
630
A
When approved by the purchaser,Alloys 303,303Se,or XM1may be furnished.B
When approved by the purchaser,Alloy 430F may be
furnished.
hardened and tempered by heating to 1010630°C sufficient for austenitization,holding for at least 1h and then air-cooling to provide the properties speci?ed in Table 2.
6.3.2When Condition HT is speci?ed,the nuts shall be hardened and tempered by heating to 1010630°C sufficient for austenitization,holding for at least 1?2h,rapid air-or oil-quenching,reheating to 275°C minimum,and holding for at least 1h and then air-cooling to provide the properties speci?ed in Table 2.
6.4Precipitation-Hardening Alloy,Grade P1—When Con-dition AH is speci?ed,the nuts shall be solution-annealed and aged by heating to 1040615°C,holding for at least 1?2h,rapid air-or oil-quenching to 27°C maximum,reheating to 620610°C minimum,holding for 4h,and then air-cooling to provide the properties speci?ed in Table 2.
7.Chemical Composition
7.1It is the intent of this speci?cation that nuts shall be ordered by property class.
7.2Unless otherwise speci?ed in the inquiry and purchase order (see Supplementary Requirement S2),when two or more alloys are permitted for nuts of a speci?ed property class,the choice of alloy to be used shall be that of the fastener manufacturer as determined by his nut fabrication methods and material availability.The speci?c alloy used by the manufac-turer shall be identi?ed clearly on any certi?cation required in the purchase order and shall have a chemical composition conforming to the limits speci?ed in Table 3.
7.2.1When the purchaser speci?es that a speci?c alloy be used,the alloy shall have a chemical composition conforming to the limits speci?ed in Table 3.
7.3Product analysis may be made by the purchaser from nuts representing each lot.The chemical composition thus determined shall conform to the limits speci?ed in Table 3for the speci?c alloy within the product analysis tolerances speci-?ed in Speci?cation A 555.
7.3.1In the event of discrepancy,a referee analysis of samples for each lot shall be made in accordance with 12.1.8.Corrosion Resistance
8.1Carbide Precipitation :
8.1.1Rod,bar,and wire in the austenitic Alloy Groups A1,A2,and A4,except the free-machining grades,303and 303Se,used to make nuts in accordance with this speci?cation,shall be capable of passing the test for susceptibility to intergranular corrosion as speci?ed in Practice E of Practices A 262.
8.1.2As stated in Practices A 262,samples may be sub-jected to the faster and more severe screening test in accor-dance with Practice A.Failing Practice A,specimens may be tested in accordance with Practice E and be considered satisfactory if passing Practice E.9.Mechanical Properties
9.1The hardness of nuts of each class shall not exceed the maximum hardness speci?ed for the class in Table 2.This shall
TABLE 2Mechanical Property Requirements
Property Class
Condition A
Alloy/Mechanical Property Marking
Nominal Thread
Diameter
Proof Load Stress,MPa
Hardness
Vickers
Rockwell
min
max min max A1-50F836A A2-50A or AF
F836B M1.6to M36
500
155
220
B81
B95
A4-50F836C A1-70F836D M1.6to M20700220330B96C33A2-70CW
F836E over M20to M36550160310B83C31
A4-70F836F A1-80F836G M1.6to M20800240350C23C36A2-80SH
F836H over M20to M24700220330B96C33A4-80
F836J
over M24to M30650200310B93C30over M30to M36600180285B89C28F1-45A or AF F836K M1.6to M36450135220B74B96C1-70H
F836L M1.6to M36
700
220
330
B96
C34
C4-70F836M C1-110C4-110HT F836N F836P M1.6to M361100350440C36C45C3-80H F836R M1.6to M36800240340C23C35C3-120HT F836S M1.6to M361200380480C39C48P1-90
AH
F836T
M1.6to M36
900
285
370
C28
C38
A
Legend of Conditions:AF—formed and annealed.
CW—formed from annealed stock,thus acquiring a degree of cold work.SH—machined from strain hardened stock.
A—machined from annealed or solution annealed stock,thus retaining the properties of the original material,or hot formed and
solution annealed.H—hardened and tempered at 565°C medium.HT—hardened and tempered at 275°C minimum.
AH—solution annealed and age hardened after forming.
be the only hardness requirement for nuts that are proof load tested.
9.2Unless proof load testing is speci?ed in the inquiry and purchase order,nuts of all classes in nominal thread diameters M4and smaller,and nuts of all classes with proof loads greater than530kN,as speci?ed in Table4,shall be furnished on the basis of having a hardness not less than the minimum hardness speci?ed in Table2.
9.3All classes of nuts,except those covered in9.2shall withstand the proof load as speci?ed in Table4.
10.Dimensions
10.1Unless otherwise speci?ed,nuts shall conform to dimensions for hex nuts,Style1,as given in ASME B18.2.4.1M.
10.2Unless otherwise speci?ed,threads shall be metric coarse threads with class6H tolerances as speci?ed in ASME B1.13M.
11.Number of Tests and Retests
11.1The mechanical and chemical composition require-ments of this speci?cation shall be met in continuous mass production for stock,and the manufacturer shall make sample inspections to ensure that the product conforms to the speci?ed requirements.Additional tests of individual shipments of material are not ordinarily necessary.
11.1.1Individual heats of steel are not identi?ed in the ?nished product.When speci?ed in the purchase order that the heat number shall be identi?ed for the products in an individual shipment,the manufacturer shall control the product by heat analysis and additionally shall conduct the testing program speci?ed in11.1.
11.2Unless otherwise speci?ed,tests for corrosion resis-tance shall be in accordance with the manufacturer’s standard quality control practices.A speci?c number of tests is not required but the nuts shall be produced by manufacturing practices and subjected to tests and inspection to assure compliance with the speci?ed requirements.
11.2.1When speci?ed on the purchase order,not less than one corrosion test to determine freedom from precipitated carbides shall be made to represent each lot.
11.3When the purchaser requires that additional tests be performed by the manufacturer to determine that the properties of nuts in an individual shipment are within speci?ed limits, the purchaser shall specify Supplementary Requirement S1in the inquiry and purchase order.
11.3.1When the purchaser does not specify the sampling plan and basis of acceptance the following shall apply:
TABLE3Chemical Requirements
Alloy Group Alloy
UNS
Desig-
nation
Composition,%maximum except as shown
Car-
bon
Manga-
nese
Phospho-
rus
Sulfur Silicon Chromium Nickel Copper
Molyb-
denum
Others
Austenitic Alloys
A1303S303000.15 2.000.200.15min 1.0017.0to19.08.0to10.00.60max A
A1303Se S303230.15 2.000.200.060 1.0017.0to19.08.0to10.0Se0.15min A1304S304000.08 2.000.0450.030 1.0018.0to20.08.0to10.5 1.00
A1304L S304030.03 2.000.0450.030 1.0018.0to20.08.0to12.0 1.00
A1305S305000.12 2.000.0450.030 1.0017.0to19.010.5to13.0 1.00
A1384S384000.08 2.000.0450.030 1.0015.0to17.017.0to19.0
A1XM1S203000.08 5.0to6.50.0400.18to
0.351.0016.0to18.0 5.0to6.5 1.75to
2.25
0.50max A
A118–9LW S304300.10 2.000.0450.030 1.0017.0to19.08.0to10.0 3.0to4.0
A1302HQ S304330.03 2.000.0450.030 1.0017.0to19.08.0to10.0 3.0to4.0
A4316S316000.08 2.000.0450.030 1.0016.0to18.010.0to14.0 2.00–3.00
A4316L S316030.03 2.000.0450.030 1.0016.0to18.010.0to14.0 2.00–3.00
A4321S321000.08 2.000.0450.030 1.0017.0to19.09.0to12.0Ti53C
min
A2347S347000.08 2.000.0450.030 1.0017.0to19.09.0to13.0Cb+Ta
103C min
Ferritic Alloys
F1430S430000.12 1.000.0400.030 1.0016.0to18.0
F1430F S430200.12 1.250.0600.15min 1.0016.0to18.00.60max A
Martensitic Alloys
C1410S410000.15 1.000.0400.030 1.0011.5to13.5
C4416
416Se
S416000.15 1.250.0600.15min 1.0012.0to14.00.60max A Se0.15min C4S416230.15 1.250.0600.060 1.0012.0to14.0
C3431S431000.20 1.000.0400.030 1.0015.0to17.0 1.25to2.50
Precipitation Hardening Alloy
P1630S174000.07 1.000.0400.030 1.0015.0to17.5 3.0to5.0 3.0to5.0Cb+Ta
0.15–0.45
A At manufacturer’s option,determined only when intentionally added.
11.3.1.1The lot,for purposes of selecting samples,shall consist of all nuts offered for inspection and testing,at one time,that are the same type,style,nominal diameter,thread pitch,material (alloy),property class,and surface ?nish.
11.3.1.2From each lot,samples shall be selected at random and tested for each requirement in accordance with the following plan:
Acceptance Criteria
Number of Pieces in Lot Number of Tests
Acceptance Number Rejection Number
800and less 101801to 80002018001to 22000301Over 22000
5
1
11.3.1.3If the failure of a test specimen is due to improper preparation of the specimen or to incorrect testing technique,the specimen shall be discarded and another test specimen substituted.
12.Test Methods
12.1Chemical Analysis —Chemical analysis shall be per-formed in accordance with Test Methods,Practices and Termi-nology A 751.
12.2Mechanical Tests :
12.2.1Hardness and proof load tests of nuts shall be performed in accordance with requirements of Test Methods F 606M.
12.2.2For nut proof load testing,the speed of testing as determined with a free-running crosshead shall be a maximum of 25mm/min.
12.3Corrosion Resistance —Corrosion tests to determine freedom from precipitated carbide shall be performed in accordance with Practice A 262,Practices A or E,as appli-cable.
12.4For the purposes of determining compliance with the speci?ed limits for properties listed in this speci?cation,an observed value or calculated value shall be rounded in accor-dance with Practice E 29.
13.Inspection
13.1If the inspection described in 13.2is required by the purchaser,it shall be speci?ed in the inquiry,order,or contract.13.2The inspector representing the purchaser 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 speci?cation.All tests and inspection required by the speci?-cation that are requested by the purchaser’s representative shall be made prior to shipment,and shall be so conducted as not to interfere unnecessarily with the operation of the work.14.Rejection and Rehearing
14.1Unless otherwise speci?ed,any rejection based on tests speci?ed herein and made by the purchaser shall be reported to the manufacturer within 30working days from the receipt of the product by the purchaser.
15.Certi?cation
15.1When speci?ed in the purchase order,the manufacturer shall furnish certi?cation that the product was manufactured and tested in accordance with this speci?cation and the purchaser’s order and conforms to all speci?ed requirements.15.2When speci?ed in the purchase order,the manufacturer shall furnish a test report certi?ed to be the last complete set of chemical analysis and mechanical tests for each nut size in each shipment.
15.3All certi?cations shall indicate the purchase order
TABLE 4Nut Proof Load Values,kN
Nominal Size and Thread Pitch Stress Area,
mm 2
Proof Load Stress,MPa A
45050055060065070080090011001200M1.630.35 1.270.570.64...0.76...0.89 1.02 1.14 1.40 1.52M230.4 2.070.93 1.04... 1.24... 1.45 1.66 1.86 2.28 2.48M2.530.45 3.39 1.52 1.70... 2.03... 2.37 2.71 3.05 3.73 4.07M330.5 5.03 2.26 2.52... 3.02... 3.52 4.02 4.53 5.53 6.04M3.530.6 6.78 3.05 3.39... 4.07... 4.75 5.42 6.107.468.14M430.78.78 3.95 4.39... 5.27... 6.157.027.909.6610.5M530.814.2 6.397.10...8.52...9.9411.412.815.617.0M63120.19.0510.1...12.1...14.116.118.122.124.1M831.2536.616.518.3...22.0...25.629.332.940.343.9M1031.558.026.129.0...34.8...40.646.452.263.869.6M1231.7584.337.942.2...50.6...59.067.475.992.7101M143211551.757.5...69.0...80.592.010*******M163215770.778.5...94.2...110126141173188M2032.5245110123135147...172196221270294M2433353159177194212...247282318388424M3033.5561252281309337365393449505617673M3634
817
368
409
449
490
...
572
654
735
899
980
A
Proof Load =A s x Proof Load Stress A s =0.7854(D ?
0.9382P )2where:
D =nominal ,mm,
P =thread pitch,mm,and
Proof Load Stress is found in Table 2.
number and the applicable requirements of Section4.
16.Product Marking
16.1Nuts in nominal thread diameters M4and smaller need not be marked.
16.2All products with a nominal size of M5and larger shall be marked with a symbol identifying the manufacturer.In addition,they shall be marked with the alloy/mechanical property marking speci?ed in Table2.The marking shall be raised or depressed at the option of the manufacturer.
16.3The manufacturer’s symbol shall be of his design. 16.4The markings shall be on the top of nut,top of?ange, or on one of the wrenching?ats.
16.5Markings located on one of the wrenching?ats shall be depressed.Markings on all other locations shall be raised or depressed at the option of the manufacturer.
17.Packaging and Package Marking
17.1Packaging:
17.1.1Unless otherwise speci?ed packaging shall be in accordance with Practice D3951.
17.1.2When special packaging requirements are required by the purchaser,they shall be de?ned at the time of inquiry and order.
17.2Package Marking—Each shipping unit shall include or be plainly marked with the following:
17.2.1ASTM speci?cation,
17.2.2Alloy number,
17.2.3Alloy/mechanical property marking,
17.2.4Size,
17.2.5Name and brand or trademark of the manufacturer, 17.2.6Number of pieces,
17.2.7Country of origin,and
17.2.8Purchase order number.
SUPPLEMENTARY REQUIREMENTS
One or more of the following supplementary requirements shall apply only when speci?ed by the purchaser in the inquiry and order(4.1.6).Supplementary requirements shall in no way negate any requirement of the speci?cation itself.
S1.Additional Tests
S1.1When tests for additional mechanical properties,cor-rosion resistance,etc.,are desired by the purchaser,the test(s) shall be made as agreed upon between the manufacturer and the purchaser at the time of the inquiry or order.
S2.Alloy Control
S2.1When Supplementary Requirement S2is speci?ed on the inquiry and order,the manufacturer shall supply that alloy speci?ed by the customer on his order with no group substi-tutions permitted without the written permission of the pur-chaser.
S3.Permeability
S3.1When Supplementary Requirement S3is speci?ed on the inquiry and order,the permeability of nuts of Grades A1, A2,and A4in Conditions A or AF shall not exceed1.5at100 oersteds when determined by Methods A342.
S4.Shipment Lot Testing
S4.1When Supplementary Requirement S4is speci?ed on the order,the manufacturer shall make sample tests on the individual lots for shipment to ensure that the product con-forms to the speci?ed requirements.
S4.2The manufacturer shall make an analysis of a ran-domly selected?nished nut from each lot of product to be shipped.Heat or lot control shall be maintained.The analysis of the starting material from which the nuts have been manufactured may be reported in place of the product analysis. S4.3The manufacturer shall perform mechanical property tests in accordance with this speci?cation and Guide F1470on the individual lots for shipment.
S4.4The manufacturer shall furnish a test report for each lot in the shipment showing the actual results of the chemical analysis and mechanical property tests performed in accor-dance with Supplementary Requirement S4.
S5.Heat Control
S5.1When Supplementary Requirement S5is speci?ed on the inquiry or order,the manufacturer shall control the product by heat analysis and identify the?nished product in each shipment by the actual heat number or lot number that is heat lot traceable.
S5.2When Supplementary Requirement S5is speci?ed on the inquiry or order,Supplementary Requirements S2and S4 shall be considered automatically invoked with the addition that the heat analysis shall be reported to the purchaser on the test
report.
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