rmmmo BY: ESTABLISHMENT OF STANDARDIZATION DATA FOR MONEL AND K-MONEL. FASTENERS Conducted for: Department of the Navy Bureau of Ships
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1 Reprt N. 7-RO-65 rmmm BY: Cm^POER, mm SKIP SYSTEMS MMMD TCCHNJCAL UBRARY STANDARDIZATION TASK REPORT TASK NO. 2 ESTABLISHMENT OF STANDARDIZATION DATA FOR MONEL AND K-MONEL. FASTENERS Cnducted fr: Department f the Navy Bureau f Shps Cntract N. NObs CLEARINGHOUSE TOn FEDERAL SCSNTTf 0 AMD TRCKN'CAr. INFOKMATJN HaQcpy Mrfce mmm mt QA 26 Aprl 965 r n C % DEC j C ENGINEERING MPANY 236 Jeffersn Davs Hghway - Alexandra, Va
2 epört N. 7-RD-65 STANDARDIZATION TASK REPORT TASK NO. 2 ESTABLISHMENT OF STANDARDIZATION DATA FOR MONEL AND K-MONEL FASTENERS Cnducted fr: Department f the Navy Bureau f Shps Cntract N. NObs Aprl 965 Cnducted by:. Gdman T. Hgland J. Mller Apprved by: ff T IX)sJ~ H. P. Wenberg, Drect Research and Develpment M VALUE ENGINEERING MPANY 236 Jeffersn Davs Hghway Alexandra, Vrgna
3 I PURPOSE ^/The purpse f testng perfrmed n ths task s () t determne thread 0 dstrtn caused by varus amunts f thread nterference» (2) t evaluate changes n materal as a result f thread nterference, length f engagement, and axal stud ladng t ts breakng pnt, and (3) t prduce cmparatve data n break-away trque and prevalng back-ut trque f the stud, and crrespndng trques fr backng ff self lckng nuts. ^ The fllwng thread frms and fts are t be nvestgated. - Engaged n ) Stud Thread Class Tapped Hle Thread Class.. 5 cut 2. 5 rlled 3. 3A cut 4. 3A rlled 5. 2A cut 6. 2A rlled 7. 5 cut 8. 5 rlled 9. 5 cut / 5 5 3B 3B 3B 3B 3B 3B ^-'Usng sealant n accrdance wth MIL-S Each f these nne fts must be tested usng K-mnel studs engaged n Mnel castng, HTS plate, HY80 plate, and HY80 castng and Mnel studs engaged n HTS and HY80 plates. II MATERIALS TESTED A. Requrements:*. K-Mnel Studs - K-mnel studs used n the perfrmance f ths task must cnfrm t Mltary Standard MS86 and the applcable : [ requrements f specfcatns QQ-N-286 and MIL-B
4 2. Mnel Studs - Mnel studs used n the perfrmance f ths task must cnfrm t the applcable requrements f QQ-N~28 and MIL-8-857, except that the studs must have the fllwng mechancal prpertes: Tensle strength - 80,000 ps, mnmum Yeld strength - 40,000 ps, mnmum (0.2 percent ffset) Elngatn n 2 nches - 20 percent, mnmum 3* Plate Materals - Plate materals must cnfrm t the fllwng specfcatns. Materal Specfcatn Hgh Tensle Steel Plate (HTS) MIL-S-63 Grade HT HY80 Steel Plate MIL-S-626 Cast HY80 Steel MIL-S Cast Mnel QQ-N Prsty - All cast materals must be subjected t radgraphc examnatn t ascertan freedm frm prsty. 5. Nuts - The nuts used n perfrmng ths task must cnfrm t Mltary Standard MSI7828, Nuts, Self Lckng (Nyln Insert), Hexagn, Regular Heght, 250 F., Nckel-Cpper Ally. B. Actual Chemcal and Mechancal Prpertes;- Tables I and II are a cmplatn f the requred and actual chemcal cmpstn and mechancal prpertes, respectvely, f the studs and materals used fr tests perfrmed n ths task. All cast materals were subjected t radgraphc examnatn. The cast HY80 was fund t be free frm frm prsty. Several plates f cast -2-
5 mnel had an area f prsty whch was marked s that n hus were drlled and tapped n these areas. -3-
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7 Table II Mechancal Prpertes Materal Item Tensle Strength Yeld Strength Elngatn n (ps) (ps) 2"(%) Mnel Studs Requred 80,000 mn. 40, 000 mn mn. ( Threads) All l/2,r 06,500 02, Studs All 7/8" 95,500 83, ; Studs All -/8" 90,500 77, Studs K-Mnel Requred 30,000 mn. 90,000 mn mn. Studs All /2" 78,700 48, ( Threads) Studs All 7/8" 63, Studs All -/8" 5,500 07, Studs Mnel Studs Requred 80,000 mn. 40,000 mn mn. ( K20-2Al / 92,300 80, Threads) K20-3A 98,500 88, K20-5HF 98,500 88, K20-5ONF 86,000 65, Q32.2A 96,200 73, Q32-3A 00,200 77, Q32-5HF 92,700 58, Q32-50NF 96,900 7, S38l / 8,200 56, K-Mnel Studs Requred 30,000 mn. 90,000 mn mn. ( K20-2A H6, Threads) K20-3A )43, K20-5HF 46, K20.5ONF 56,200 98, ^ 53, S38l / 52, Mnel Castng Requred 65,000 mn. 32, 500 mn. 25 mn. Actual 78, HY80 Steel Requred Fr nfrmatn nly 80,000-95, mn. Castng y Actual 3,000 92, VRefers t szes lsted n Mltary Standard MSI599. «/All studs f ths sze.
8 Ill THREAD GAGING AND DIMENSIONS A. Thread Gagng:- The Thread majr dameter, mnr dameter, ptch dameter, ncluded angle and thread lead f each stud and blt used n ths prgram were measured at three pnts alng the thread. An average f the three results fr each dm- ensn was used. Super Mcrmeter. The majr dameter was measured n a Pratt & Whtney- Tr-rll gages were used t measure the ptch dameter t an accuracy f nch. The ncluded angle, mnr dameter and lead were measured n a J & L Cmparatr t an accuracy f nch. The ptch dameter and mnr dameter f the nternal hles were measured wth a Bryant P-2 Thread Gage. Defrmatn f studs caused by varus amunts f nterference was determned usng a Scherr-Tumc ptcal cmparatr. Thread Dmensns:- Classes 2A and 3A UNC external threads and class 3B UNC tapped hles were n accrdance wth Handbk H28, Screw-Thread Standards fr Federal Servces. Handbk H28 (957) Part III (pages 48-52), prvdes dmensns fr external and nternal nterference ft (class 5) threads. These dmensns and ptch dameter lmts were based n the externally threaded members beng?teel ASTM A-325 (SAE grade 5) r better. In the absence f any ther dmensnal data, these dmensns n Handbk H28 were used when class 5 threads were requred fr the mnel and K-mnel studs used n ths prgram. NC5 HF threads were used fr mnel and K-mnel studs engaged n tapped -6-
9 hles n HTS, HY80 plate and HY80 castng. NC5 ONF threads were used fr K-mnel studs engaged n tapped hles n mnel castngs. NC5 IF threads were used fr tapped hles n HTS, HY80 plate and HY80 castng and NC5 INF threads were used fr tapped hles n mnel castngs. IV TEST PROCEDURE AND RESULTS Fr the sake f clarty and cntnuty, bth the test prcedure and test results are ncluded n ths sectn. Studs were engaged t the mnmum length f engagement as determned n Task I. A summary f these mnmum length f engagement data are ncluded n Appendx L Wth the stud engaged, a self-lckng nut was nstalled untl a length f tw thread ptches extended beynd the lckng devce f the nut. The break- away and back-ff trques fr remvng the nut were determned wthut any axal lad appled t the nut (as specfed n MIL-N-25027B, paragraph ). Self-lckng nuts frm bth Elastc Stp Nut Crpratn (ESNA) and Greer Stp Nut Cmpany were used n rder t cmpare trque data fr nuts suppled by dfferent surces. shwn n Table III. The average trques fr /2, 7/8 and -/8 nch nuts are The trques fr the /2 and 7/8 nch nuts were btaned wthut applyng any lubrcant t the nut r t the nut end f the stud. When attemptng t test the -/8 nch nuts n a lke manner, a cnsderable number balled up durng back-ff. Cnsequently, the break-away and back-ff trques fr the -/8 nch nuts were btaned wth the nut end f the stud lubrcated wth "S-n-One" SAS 20 l. The nut end f the studs had UNC 2A threads. -7-
10 Table III Break-away and Back-ff Trques fr Self-Lckng Nuts Sze (nch) Trque ESNA GREER /2 Br*»ak-away Back-ut 7/8 Break-away Back-ut -/8 Break-away Back-ut 8 n.-lb. 76 n.-lb. 27 ft.-lb. 9 ft.-lb. 33 ft.-lb. 8 ft.-lb. 98 n.-lb. 67 n.-lb. 3 ft.-lb. 2 ft.-lb. - The break-away and back-ut trques fr remvng the studs were, subse- quently, determned. These trques were btaned wthut any preladng f the studs. The test»et-up fr determnng these trques s shwn n Fgure, whch shws an HTS plate wth 7/8 nch tapped hles, a mnel stud, stud remver and trque wrench. Mnel and K-mnel studs wth classes 2A cut and rlled and 3A cut and rlled threads engaged n tapped hles wth class 3B threads caused n bservable permanent dstrtn f the external r nternal threads. The break-away and back-ut trques fr these 2A/3B and 3A/3B fts were lwer than the break-away trque fr remvng the self-lckng nuts. The break-away and back-ut trques fr /2, 7/8 and -/8 nch studs wth class 5 threads engaged n tapped hles wth class 3B and class 5 threads are tabulated n Table IV. The trques fr the /2 and 7/8 nch studs were btaned wth the nternal hles lubrcated wth '^-n-one" SAE 20 l. Ths lubrcatn, hwever, prved uadequ'xte fr the -/8 nch studs. Break-away trques fr the -/8 nch studs were, n sme cases, as hgh as 2000 ft. -lbs. because f sezng and ballng up f the threads. Ths prblem was remeded by lubrcatng the studs wth Fel-Pr C-200 (Felt Prducts Manufacturng Cmpany, Skke, Illns). -8-
11 r r Fgure - Determnatn f Break-Away Trque
12 Sze: /2 nch Plate Materal: HY80 Stud Materal Table IV Break-away and Back-ut Trques f Studs r - ^ Class 3B / Interference Cla«S' Interference K-mnel 60-40/ ft-lb n-lb ft-lb ft-lb nch ft-lb ft-lb ft-lb ft-lb Mnel ft-lb I 70-0 n-lb ft-lb 29-9 ft-lb ; ft-lb ft-lb ft-lb 20-2 ft-lb ! Sze: /2 nch Plate Materal: HTS Stud r Materal Class 3B Interference Class 5 Interference K-mnel n-lb ft-lb n-lb ft-lb ft-lb ft-lb ft-lb ft-lb.0044 Mnel n-lb ft-lb n-lb ft-lb n-lb ft-lb n-lb ft-lb.0039 Sze: /2 nch Plate Materal: Cast HY80 Stud r Materal Class 3B Interference Class 5 Interference K-mnel ft-lb ft-lb ft-lb ft-lb ft-lb 20-8 ft-lb ft-lb ft-lb Sze: /2 nch Plate Materal: Cast Mnel Stud r Materal Class 3B Interference Class 5 Interference K-mnel n-lb ft-lb ft-lb ft-lb ft-lb ft-lb ft-lb ft-lb
13 ' I B B Sze: 7/8 nch Plate Materal: HY80 Stud r Class 3B Materal (ft-lb) Interference K-n ne I Mnel I Class 5 (ft-lb) Interference ' 0008 j.0062 j.006 r t Sze: 7/8 nch Plate Materal: HTS Stud Materal r Class 3B (ft-lb) K-mnel Mnel ! Interference Class 5 (ft-lb) Interference [ ! Sze: 7/8 nch Plate Materal: Cast HY80 Stud r Class 3B Materal I (ft-lb) Interference K-mnel! ' Class 5 (ft-lb) Interference j ! Sze: -/8 nch Plate Materal: HY80 Stud r Class 33 Materal I (ft-lb) Interference K-mnel I Mnel Class 5 (ft-lb) Interference j ; --
![' Sze: -/8 nch Plate Materal: HTS Stud Materal r Class 3B (ft-lb) K-mnel 39-28 353-33 Interference 0.003.0062 Class 5 (ft-lb) 300-278 Interference 0.0088 < Mnel ] \ 556-47 54-550 56-39 94-60 92-60.](/docs-images/73/68365656/images/14-1.jpg "0085.0059.0025.0063.004 492-48 33-289 385-342 246-245. 0088. 0086,0057.0062 Sze: -/8 nch Plate Materal: HY80 Cast Stud r Class 3B Materal (ft-lb) Interference K-mnel 7-39 267-236 47-444 686-642 0.")
14 ' Sze: -/8 nch Plate Materal: HTS Stud Materal r Class 3B (ft-lb) K-mnel Interference Class 5 (ft-lb) Interference < Mnel ] \ , Sze: -/8 nch Plate Materal: HY80 Cast Stud r Class 3B Materal (ft-lb) Interference K-mnel Class 5 (ft-lb) Interference ,0098 Sze: -/8 nch Plate Materal: Mnel Stud r Class 3B Class 5 Materal (ft-lb) Interference (ft-lb) Interference K-mnel * ^Refers t stud thread. ylnternal Thread Class. Break-away-Back-ff trques. Several studs were reengaged t determne t what extent the break-away and back-ut trques were reduced as a result f the frst engagement. These data are tabulated n Table V. -2-
15 V '? >:l / n! n n Sze (ch) Table V Break-away and Back-ut Trques after Re applcatn Stud Stud- Internal Internal Trques after Trques after Materal r Thread Thread Frst Applcatn Re applcatn Materal Class (ft-lb) /2 K-mnel HTS n-lb HY n-lb CastHYSO ft-lb Mnel n-lb HTS : ; n-lb HY n-lb CastHYSO ft-lb Mnel HTS ft-lb HY n-lb HTS n-lb HY n-lb 7/8 K-mnel HTS ft-lb HY ft-lb CastHYSO n-lb HTS ft-lb HY ft-lb Mnel HY ft-lb HTS ft-lb These studs were reengaged and axally laded t ther breakng pnt. bject f ths lad test was t determne whether the thread dstrtn ccurrng The I durng engagement weakened them t a pnt where they wuld strp when the stud was laded axally. In all the lad tests perfrmed, the stud brke wthut any strppng f the external r nternal threads. All lad tests were perfrmed wth the studs engaged t the mnmum length f engagement determned frm testng perfrmed n Task I (see Appendx I). Fgures 2 thrugh 5 shw the defrmatn whch ccurred when mnel and K-mnel studs wth cut and rlled, class 5 threads were engaged n class 5 tapped hles n HY80 plate. Durng drvng, plastc flw ccurs whch results n an ncrease f the stud majr dameter. Typcal ncreases n majr dameter resultng frm nterference ft are shwn n Table VI. -3-
16 FIGURE 2: Defrmatn f a 7/8 nch K-Mnel Stud wth, Class 5 Threads after Engagement n a Class 5 Tapped Hle n HY80 Plate. FIGURE 3; Defrmatn f a 7/8 nch Mnel Stud wth, Class 5 Threads after Engagement n a Class 5 Tapped Hle n HY80 Plate. ;
17 FIGURED : Defrmatn f a 7/8 nch K-Mnel Stud wth, Class 5 Threads after Engagement n a Class 5 Tapped Hle n HY80 Plate. FIGURES: Defrmatn f a 7/8 nch Mnel Stud wth, Class 5 Threads after Engagement n a Class 5 Tapped Hle n HYbO Plate.
18 \ l Sze (nch) ' /2 Stud Materal Stud- r K-mnel Table VI Increase n Stud Majr Dameter as a Result f Interference Ft HTS HY80 Cast HY80 Mnel j Majr Ptch MDC PDI MDC PDI MDC PDI Dameter Dameter Change Interference (nch) (nch) (nch) (nch) (nch) (nch) (nch) (nch) Mnel ! /8 K-mnel Mnel V GENERAL MMENTS Based n the test data, t s recmmended that class 5 studs nt be engaged n class 3B tapped hles. The smaller mnr dameter f the 33 hles as cm- pared t that f class 5 resulted, n many cases, n excessve drvng trques and, n sme cases, n snzng and gallng f the threads. In testng K-mnel studs n tapped hles n cast mnel, NC5 ONF threads were used fr the studs and NC5 INF threads were used fr the hles. Althugh ; ; nt t much dffculty was experenced wth the /2 nch studs, engagng 7/8 and -/8 nch NC5 ONF studs n NC5 INF hles caused sezng and gallng, n -6-
19 the majrty f tests cnducted. In many cases, ballng f the sezed metal was s great that t resulted n trsnal falure f the stud when attemptng t back t ut. The use f NC5 HF studs n the NC5 INF tapped hles n the cast mnel greatly reduced the frequency f sezng and gallng. The use f a lubrcant such as the Fel-Pr C-200 als allevated ths prblem f gallng n the NC5 ONF/NC6 INF ft. -7-
20 v APPENDIX I
21 Stud Materal Sze (nches) Table I Mnmum Length f Engagement Mnmum length f engagement (nches) Internal thread materal Mnel Hgh Tensle HY80 Steel HY80 Steel Castng Steel Plate plate Castng Mnel /2 _ K-Mnel / Mnel 7/ K-Mnel 7/ Mnel -/ K-Mnel -/
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