Designation: F 594-02 Standard Specification for Stainless Steel Nuts’ This standard is iemd unde the fed designion F554; he sumber immediately folowing the designation indies te year of ‘ig adoyion oy, the aso revision, the year of st eis, A umber in pteteves nce the yea! ef hat eapeonal A superscrp epee) incicaes an edo change ince the last esion ce approval ‘mi andart hasbeen approved for ue by agencir ofthe Deparment of Defeat 1. Scope 1.1 This specification covers the requirements for stainless see! nuts 0.25 to 1.50 in, inclusive, in nominal diameter in a amber of alloys in common use and intended for service applications requiring general corrosion resistance, 12 Seven groups of stainless steel alloys are covered, including ten austenitic, two ferritic, four martensitic, and one cipitation hardening. cow loys Conditon® 1 $04,905,908 (0M) cold worked? ‘S84, 1o-buW, 300" 2 seat (om cold wortoa® 3 Bar (om sald workod? 4 aoe (OW) sod warted? 3 for (H—_hardoned nd tempered rae (hardened an tempered, 7 60 (ae aged hardened AUnkes thoiespected nthe nau and rc tha choee at analy ton, thins goup shal be we dacreion af th astone: manulactare 00), See 42 fr eptors. nen approved by te pucaser, ays 903, 9095e, or XMI may be pu ” 220 0.75. and argo ray bo hot worked and solutonsnvesles ‘¥en approves by the orcas, toy 4S0F may be tunis “wen approved by he purchaser, aloy 416 or 416Se may be turishod 13 Supplementary requirements of an optional nature are [rovided, applicable only when agreed upon by the manufac ftrer and the purchaser at the time of the inguiry and order. 14 Suitable bolts, hex cap screws, and studs for use with ‘ts included in this specification are covered by Specification F593. Unless otherwise specified, all bolts, hex cap screws, nd stads used with these nuts shall conform to the require tents of Specification F 503 and shall be of the same alloy Eup, 2 Referenced Documents 2. ASTM Standards: ‘A262 Practices for Detecting Susceptibility to Inter- ‘granular Attack in Austenitic Stainless Steels? his seston ie under the jrinditon of ASTM Commit FI6 on Id be diet eponsiity of Satvmmitee F16.04 op Nowferou [Gare eon approved April 10, 2002. Pulihed April 2002, Originally ‘el ag F894 78 Last pevons eatin F304 01 Anat Book of ASTM Standard, Vel 0103. A216 Specification for Stainless Steel Bars and Shapes? ‘A342/A 342M Test Methods for Permeability of Feebly Magnetic Materials? ‘A380 Practice for Cleaning, Descaling, and Passivation of Stainless Stcel Pars, Equipment, and Systems? A.4S4/A 484M Specification for General Requirements for Stainless Stcel Bars, Billets, and Forgings? ‘A-493 Specification for Stainless Stel Wire and Wire Rods for Cold Heading and Cold Forging” ASSSSIA SS5M_ Specification for General Requirements for ‘Stainless and Heat Resisting Stee! Wire and Wire Rods? A'S64/A 564M. Specification for Hot-Rolled and Cold- Finished Age-Hardening Stainless Steel Bars and Shapes? A'S71 Specification for Austenitic Ductile Tron Castings for Pressure-Containing Parts Suitable for Low-Temperature Service* ASRIA 5R2M_ Specification for Pree-Machining Stainless Steel Bars? A751 Test Methods, Practices, and Terminology for ‘Chemical Analysis of Stel Products? 1D 3951 Practice for Commercial Packaging’ 29 Practice for Using Significant Digits in Test Data Determine Conformance with Specifications® 353 Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium Nickel-ron Alioys” F593 Specification for Stainless Steel Bolts, Hex Cap Serews, and Studs* F606 Test Methods for Determining the Mechanica Prop- erties of Externally and Internally Threaded Fasteners, Washers, and Rivets® F 1470 Guide for Fastener Sampling for Specified Mechani- cal Properties and Performance Inspection* 22. ASME Standards? BI.I Unified Inch Screw Threads Annus! Book of ASTM Standards, Yo 038, mua Book of ASTM Stndarie, Vo O1.02 5 Anmual Book of ASTM Standards, Vl 15.09 * Anaual Book of ASTM Standards, Vo 14.02 * annual Book f ASTM Standards, VOLO. Annual Book of ASTM Standards Vl 01.08. * Avalibie fom Global Fngieeing Daciments 1 Inverness Way. ast agleweod, CO 80112. mp AST nantes 100 Br Harr Orv, PO Boe C70, Woe Cantchesan, PA 42205, Unig Sates 217Alp F 594-02 B18.22 Square and Hex Nuts Note 1—The following ASTM siandards are noted for information ‘only as suitable sources of material forthe manufacture of nus to this specication: ‘Specifications A 493, A S64/A S63M, and A S82/A 582M, 3. Ordering Information 3.1 Orders for nuts under this specification skal include the following 3.1.1 Quantity (number of pieces of each item and size), 3.1.2 Name of item, 3.13 Size (diameter and threads per inch), 3.14 Alloy group number (see 6.2.1), and 3.1.5 Condition (see 4.2). 3.1.6 Orders for nuts under this specifi the following optional requirements: 3.61 Forming (see 4.1.1), 3.1.6.2 Composition (see 62), 3.1.63 Corrosion resistance (see 8.1), 3.1.64 Thread class (see 9:2), 3.165 Finish (see 103), 3.1.66 Test eport (see 17.2) 3.1.67 Rejection (see 16.1) 3.1.68 Test rejection (see 16.1), and 3.1.69 Special packaging (see 19.2). 3.1.7 Supplementary requirements if any, to be specified on the order (see SI through $8), and 3.1.8 ASTM specification and date of issue. When date of issue is not specified, fasteners shall be furnished tothe latest [Nore 2—Exanpl: 10-000 pices, Hex Net,0:250in.-20, Alloy Group 1. Condon CW. Punish Test Repo. Supplemestary Requirement $3, may include 4, Manufacture 4.1. Manufacture 4.1.1 Forming—Unless otherwise specified, the nuts shall be hot formed, cold formed, or machined. from suitable ‘material, at the option of the manufactures. 42 Condition—The fasteners shall be furnished in the unless specified to be furnished in one of ‘ness Onewee Optenal Coneans ‘Spechied (rust te pct) 123 ow AA, SH a ew x 5 i “ é i Co Hardened end tmpare a 1050 (€5°C) rium. Hardened and tampered at 825° (74°C) minimum Machined fom min hardened stk. 218 5. Heat Treatment S.L_ Alloy Groups 1, 2, and 3 (Austenitic Alloys 303. 3035. 304, 3O4L, 305, 316, 3161, 321, 347, 384, XMI, 18-9LW, any SORHO) : 5.1.1 Condition A—When Condition A is_ specified, the ‘austenitic alloys shall be heated to 1900 + SO°F (1038 < 28°C), at which time the chromium carbide will 20 ito the solution, be held for a sufficient time, and then be cooled at Tale sufficient to prevent-precipitetion of the carbide and i provide the specified properties. 5.1.2. Condition CW—When Condition CW is specified, the ‘austenitic alloys shall be annealed as specifiedin 5.1.1 and ther cold worked to develop the specified properties. 5.1.3 Condition AF—When Condition AF is specified, the sustenitic alloys shall be annealed as specified in 5.1 aftr a cold working, including forming and threading 5.2 Alley Group 4 (Ferritic Alloys 430 and 430F) 5.2.1 Condition A—The ferrite alloys shall be heated to. temperature of 1450 + SOF (788 + 28°C), held for = appropriate time, and then air cooled to provide the specified properties 5.2.2 Condition CW—When Condition CW is specified, th ferric alloys shall be annealed in accordance with 5.2.) ‘generally by the raw material manufacturer. and then col worked to develop the specified properties. 4.3 Alloy Group 5 (Martenstic Alloys 410, 416, and 46S: 5.3.1 Condition H—When Condition His specified, the ‘martensitic alloys 410, 416, and 416Se shall be hardened and tempered by heating to 1850 + 50°F (1010 = 28°C) sufficiew for austenitization, held for at least 4h and rapid air- cil-quenched, then rehesting to 1050°F (565°C) minimum fe at least | h and air cooled (9 provide the specified properties 5.3.2 Condition HT—When Condition HT is specified, te ‘martensitic alloys 410, 416, and 416Se shall be hardened and tempered by heating to 1850 + 50°F (1010 + 28°C) suficien for austeitization, held for at least 4h and rapid air- « cil-quenched, then reheating to 525°F (274°C) minimum for least I h and air cooled to provide the specified properties. ‘$4 Alloy Group 6 (Martensitic Alley 431): 54.1 Conditions Hand HT—The martensitic alloy 431 shall be hardened and tempered es specified in 5.3.1 and $32 1s applicable 5.5 Alloy Group 7 (Precipitation Hardening Alloy €30) 5.5.1 Condition AH—The precipitation hardening alloy 630 shall be solution annealed and aged by heating to 1900 = 25°F (1038 = 14°C) for atleast 4 b and rapid air or oil quencha! to 80°F (27°C) maximum, then reheating to a temperature of 1150 =: 15°F (621 * 8°C) for 4 hand air cooled to provide de specified properties. 6. Chemical Composition 6.1 Alloy Groups—It is the intent of this specification thi fasteners shall be ordered by alloy group numbers that incluie alloys considered to be chemically equivalent for genenl purpose use. The alloy groupings are as shown below, Whet required, however, a specific alloy may be specified as perm ted by 6.2.2 Pee eeut ae al a __ 4g? F 594-02 ‘toy rep oye the choice of an alloy from within a group shall be at the ; sian discretion of the fastener manufacturer as required by his Sam ‘method of fastener fabrication and material availability: The 2 ear specific alloy used by the fastener manufacturer shall be cleatly 3 air identified on any cenification required by the order and shall t = have a chemical composition conforming to the requirements ® os fof Tuble 1 for the specitic alloy, 7 oo 6.2.2 Ordering by Specific Alloy—When ordered by a spe- Arion somroved by te purchaser, anys 303, 88%, oF HMI may te cific alloy number, the fasteners shall conform tothe chemical pe owes een oeae mac ‘composition limits of Table 1 for the specific alloy. | Wen scored by he purchase, toy 41 o 16Se mey bo hand. 63 Product Analys 62. Chemical Composition Limits 6.3.1 Product analysis may be made by the purchaser from | 62:1 Ondering by Alloy Group—Unless otherwise specified finished nuts representing cach lot. The chemical composition ‘on the inquiry and order (see Supplementary Requirement $4), thus determined shall conform to the requirements of Table 1 TABLE 1 Chemical Requirements ae Corben Semana Gh a TORT a ad ange Phos ewe hate cmon Manos ‘utur Sen Cremiun—‘Neke! Copper Mobdenun Ofer Tae Ho a a eT) aoe Diamar | a soos 90858015, 200 0 0.080 1,00 Bote 800.15 + S000 aoe a) wots ca8o 100 soe 1m ire) 1 sooo atl 003 200M com 10 ecw 100 to 1 suosoo 05 os? 200 wks tc wee 400 | 1 nt ons 5, 040 0.1810 1.00 $010 1.7510 0.80 max* | 20000 owes a8 ore 1B 1 sa0490 HOU 010 200 cats 0.0 foo sowao + sams amon 200 cts omme 0 e010 100 201049 a ee too 200-8008 ao 2 sso 515008200 ams om 1 ot6 20-300 3 seo at 08200 tse” $0 nase a TY eto an nn Feri Ape a Seeoeo apo ‘200 oom sa vaaw Sto Goro t28 Geo tsa te ao 0 next weote tao rer mo a a a a aT a eC 20 met ‘ao 5 seme sese os5 125 0m om 10) sears er = Precptation Hardenhg Alloy 2 a {At marutacaurers option, determined only when Nntertcnally added, ‘ato coreces 219 LAf F 504-02 forthe specific alloy suisject to the Product Analysis Tolerance in Specification A 555/A 555M. 63.2 In the event of discrepancy, a referee chemical analy~ sis of samples from each lot shall be made in accordance with 14a. 7. Mechanical Properties 7.1 The finished fasteners shall meet the applicable me- chanical properties of Table 2 for the specified alloy group and condition witen tested in accordance with the mechanical property requirements 2s specified herein (see also Table 3). TABLE 3 Mechanical Test Requirements on Nuts ARE Seige ee aera ora Tess Conducted uang Far ‘Site Poaue Proot Stove. pel pares PSST — loss ag aan a ‘TABLE 2 Mechanical Property Requirements” Sianees Nby Comair “Aloy merrancal Tlompal Diam Pian Siass, Foca (Grove Property Macing erin. on Heraress ‘Assan Alay * ‘Fecan Yeie Vs 7 365 max 1 a soa8 vate Ne, no 3 0 1 5, ret (903,208, 904 om Fete ‘bm et 100 159510 ¢ $2, net 305,384. Gwe FSea0 sto 1d 6 80 10 82, nt san, 8-30, sat Gua Je tate 120 C24 C 36 rt ‘024, 90380) Ha org ‘io ins vo C2006 2 t SH Fore 16 te 1 ne 400 B05 1 C20, na Sa 0 19 to re a8 1202 28, nat ae SOME to Ye, nd 0 ‘B85 max 2 * soar Mate We ne * 265 © 95, nt er ows Faoee “ae ti 100 5 1 6 2, nt sre, owe id Meio 1 net 8 10 to 32, nt sa sou YD, 120 (C24 C 36, at Sa nar Sot at x0 Cet 32 nt Sus ara 14 to 18, 400 B05 to C80, nat sae =o 14 161A ine 5 1010 28. nat a Foes Ye 4 we 7 65 max 3 * ak yao V4) EA 205 © 95, nt a2, ser) ow sea ato Met 100 195 10.6 se, nt Gwe Fsoant Meio 1 nek 8 Bo C32 n su as “ats Me 120 Cea C 36. rt He oR 101 ld 0 (C20t6C 2, SH ad tae Berna 100 15 oC 20, net SH foc 14 14 ne 6 0 6 28, nl 4 a ean Tae Wa we = a5 me (420, 4000) ow sea “aot, int © 78 Oe, nt owe Fsonw sete Me is B65 3 98, et Marertio Aloye 5 # Fase ‘aio Wa, ba 100 (a0, he (410,496, 1689) at scan Ya ta 1 ol 160 Ct 48, ho é % Fass Vato, mo as (5 032 net wen a Fae 001% ae 180 C0 0 48. he Preciptaon Hardening Aloys 7 a Foe ve 1, Pa rr [28096 he @2) 220 fins ruts o—_—_—— EEE Gy F 504-02 1 Ls Ih Oa nh VO cal 8. Corrosion Resistance 8.1 Carbide Precipitation: 8.11 Rod, bar, and wire in the austeitic Alloy Groups 1, 2, and 3, except the free-machining grades, 303 and 3038e used to make fasteners in accordance with this specification, shall be capable of passing the tet for suscepébility to intergranular comosion as specified in Practice E of Practice A 262. 8.1.2 As stated in Practice A 262, samples may be subjected to the faster and more severe screening test in accordance with Practice A. Failing Practice A, specimens may be tested in accordance with Practice E and be considered satisfactory if passing Practice E, 9. Dimensions 9.1 Nuts: 9.1.1 Unless otherwise specified, the dimensions shall be in accordance with the requirements of ASME B18.2.2 for Hex Dus, 9.1.2 When specified, the dimensions of nuts shall be in accordance with the requirements of ASME BI8.22 (type as specified), or such other dimensions as may be specified. 92 Threads (see Table 4)—Unless otherwise specified, the tuts shall have Class 2B threads ia accomdance with ASME BLI 10, Workmanship, Finish, and Appearance 10.1 Workmanship—The nuts shall have a workmanlike finish, free of injurious burrs, seams, laps, irregular surfaces, and other defects affecting serviceability. 10.2 Surface Finish—The nuts shall have a surface finish produced in accontance with Practice A 380. 10.3 Protective Finishes—Unless otherwise specitied, the ‘nus shall be furnished without an additive chemical or metallic finish, 11, Sampling 11.1 Allot, forthe purposes of selecting test epecimens, shall ‘consist of not more than 100 000 pieces offered for inspection at one time having the following common characteristics: LLL One type of item, 11.1.2 Same alloy and condition, and 11.1.3 One nominal diameter and thresd series 12, Number of Tests and Retests 121 Number of Tests: 12.1.1 Mechanical Tests—The mechanical requirements of this specification shall be met in continuous mass production for stock. The manufacturer shall make sample inspections as specified below to ensure the product conforms to the specified requirements. When tests of individual shipments are required, Supplementary Requirement $1 must be specified in the inguiry and order. ‘Acceptance cmt, unter of Feces nt number “""Resentanee Reseson ofets Number” —Number 2t080 2 ° 1 5110690 3 ° 1 39091 1 199000 8 ° 1 12.1.2 Corrosion Resistance Tests: 12.1.2.1 Unless otherwise specified, tests for corrosion re- sistance shall be in accordance with the manufacturer's stan- dard quality control practices. A specific number of tests is not required, but the fasteners shall be produced by manufacturing practices and subjected to tests and inspection 10 assure ‘compliance with the specified requirements. 12.1.22 When specificd on the purchase order, not less than fone corrosion test to determine freedom from precipitated carbides shall be made to represent each lot, TABLE 4 Tonsile Stross Areas and Threals per Inch ‘Coarse Treade-UNC Fine Toad UNF Tread Sonor 3 UN Nominal 20, (0) Trends Treads! ‘tes ‘Sress | % (w250) 2 20 ‘00564 fe @atas) ‘e Py 0500 esr) 6 a os7s Ya (04575) u 0 oner % as00 8 20 01508 Me (05805) 0 2000 “ (02s) * %e 2300 * (e750) 10 ie 3730 a (oa75) ° 4 ‘05080 190 ' 2 ‘680, me gaa8, 2 07020 12 o0ts0 ° 0700 a8 7 2.2090 2 sor30 e 000 m™ Gar) « 11380 2 13180 8 1233 Mm 1500 é 1080 2 1set0 8 sane “Tons ese eons ae comoued using the otowig equation ters strss are, in2, romina ze (bal ajo arta hand or: Ane a maiAy F 504-02 12.2 Retests 12.2.1 When tested in accordance with the required sam- pling plan, a lot shall be subject to rejection if any of the test specimens fail to meet the applicable test requirements. 12.2.2 If 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 specimen substi- uted. 13, Specimen Preparation 13.1 Chemical Tests—When required, samples for chemical analysis shall be taken by drilling, sawing, milling, turing, clipping, of other such methods capable of producing repre- sentative samples. 132 Mechanical Tests 132.4 Nuts shall be tested in fall section. 13.2.2 The hardness shall he determined on the top of botiom face of the nut. 133 Corrosion Resistance—Test specimens shall be pre- pared in accordance with Practices A 262, 14, ‘Test Methods 14.1 Chemical Analysis—Chemical analysis shall be per- formed in accordance with Test Methods, Practices, and Terminology A 751 14.2 Mechanical Tests: 14.2.1 The proof load or proof stress shall be determined on each sample in accordance with Test Methods F 606. 14.2.2 ‘The hardness shall be determined in accordance with Test Methods F 606 at the top or bottom face of the nut. A ‘minimum of two readings shall be made on each sample, each of which shall conform to the specified requirements. 143 Corrosion Resistance—Corrosion tests to determine freedom from precipitated carbides shall be performed accordance with Practices A 262, Practices A or E as appl cable. 15, Significance of Numerical Limits 15.1 For the purposes of determining compliance with the specified limits for properties listed in this specification, an observed value or calculated value shall be rounded in accor- dance with Practice F 29 16. Rejection and Rehearing 16.1 Unless otherwise specified, any rejection based on tests specified herein and made by the purchaser shall be reported to the manufacturer within 30 working days from the receipt oj the product by the purchaser. 17. Certification and Test Reports 17. Certificate of Compliance—Ualess otherwise speciteg in the purchase order, the manufacturer shall furnish certificn tion thatthe product was manufactured and tested in acc dance ‘with this specification and the customer's order si conforms to all specified requirements. 172 Test Report When specified on the order, the many facturer shall furnish a tes repor showing the tests ofthe fe completed set of mechanical tets foreach stock size in the shipment. 173 All certification shal indicate the purchase onder num ber and the applicable requirements of Section 3 18, Product Marking 18.1 Individual Nucs—AUl products shall be marked with symbol identifying the manufacturer. In addition, they shall te marked with the alloy/mechanical property marking specified in Table 2. The manufacturer may at his option ad the specif stainless alloy designation from Table |, However, masking o¢ the stainless alloy designation does not signify’ compliance with this standard, The marking shall be raised or depressed & the option of the manufacture, 182 The marking shall be on the top of the mut or on one ct the wrenching fats, 18.3 Markings locsted on the wrenching flats shell be depressed. Markings on all othcr locations shall be raised ce depressed at the option of the manufacturer. 19, Packaging and Package Marking 19.1 Package Marking—Bach shipping unit shall ipelade ‘or be plainly marked with the following: 19.1.1 ASTM specification, 19.12 Alloy number, Alloy/mechanical property marking Size, [Name and brand oF trademark of manufactures, Number of pieces, Country of origin, and 19.1.8 Purchase order number. 19.2 When special packaging requirements are specified ty the purchaser, they shall be defined atthe time of ingury a order. 19.3 Unless otherwise specified, packaging shall be 8 accordance with Practice D 3051 sio