1、AEROSPACE STANDARDELBOW, BULKHEAD UNIVERSAL 90, FLARELESS TUBEAS21908Copyright 2017 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or other
2、wise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA)Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgISSUED1998-03REAFFIRMED 2015-04REVISED2017-01THIRD ANGLE PROJECTI
3、ONCUSTODIAN: G-3/G-3BREV. EFEDERAL SUPPLY CLASS4730AS21908SHEET 1 OF 4REV.EPROCUREMENT SPECIFICATION: AS18280 /10/SAE Technical Standards BoardRules providethat:“This reportis publishedby SAE to advance thestateoftechnical andengineering sciences. The useofthis reportis entirely voluntary, and its a
4、pplicability and suitability forany particularuse, includingany patent infringement arising therefrom,is thesole responsibility of theuser.”SAE reviews eachtechnical reportatleastevery fiveyears at whichtime it may berevised, reaffirmed, stabilized, or cancelled. SAEinvites your written comments and
5、 suggestions.SAE values your input. To provide feedback on thisTechnical Report, please visit HTTP:/STANDARDS.SAE.ORG/AS21908ERATIONALEADDED REVISION BLOCK, INTRODUCTORY NOTICE, PART MARKING AND DIMENSIONING NOTES, REACTIVATED MATERIAL CODES DASH “-“ AND “D” AND CLARIFIED OTHER MATERIAL STATUS.NOTIC
6、ETHE INITIAL SAE PUBLICATION OF THIS DOCUMENT WAS TAKEN DIRECTLY FROM U.S. MILITARY STANDARD MS21908 AND RETAINS THE SAME PART NUMBERS ESTABLISHED BY THE ORIGINAL MILITARY DOCUMENT. PROCUREMENT OF MS21908 PART NUMBERS TO THIS “AS” STANDARD MAY RESULT IN LOSS OF CONFIGURATION CONTROL WHERE DIFFERENCE
7、S IN THE CANCELLED MIL-F-18280 AND THE SUPERSEDINGAS18280 PROCUREMENT SPECIFICATIONS EXIST. AS1008 IS A RECOMMENDED REPLACEMENT STANDARD THAT ELIMINATES THIS PROBLEM.FIGURE 1 - ELBOW, BULKHEAD UNIVERSAL 90, FLARELESS TUBEAEROSPACE STANDARDAS21908SHEET 2 OF 4REV.EELBOW, BULKHEAD UNIVERSAL 90, FLARELE
8、SS TUBETABLE 1TABLE 1A - DIMENSIONS H-RDASHNO./5/NOMINALTUBESIZEREF(T) THREADAS8879HRADM+.047-.000Q+.047-.000RRAD-2 .125 .3125-24 UNJF-3A .063 1.313 .781 .156-3 .188 .3750-24 UNJF-3A .063 1.391 .906 .188-4 .250 .4375-20 UNJF-3A .063 1.500 .938 .219-5 .313 .5000-20 UNJF-3A .094 1.531 1.031 .250-6 .37
9、5 .5625-18 UNJF-3A .094 1.688 1.063 .281-8 .500 .7500-16 UNJF-3A .094 1.969 1.313 .375-10 .625 .8750-14 UNJF-3A .094 2.250 1.500 .438-12 .750 1.0625-12 UNJ-3A .094 2.469 1.625 .531-16 1.000 1.3125-12 UNJ-3A .125 2.594 1.719 .656-20 1.250 1.6250-12 UNJ-3A .125 2.875 2.000 .813-24 1.500 1.8750-12 UNJ-
10、3A .125 3.156 2.188 .938-32 2.000 2.5000-12 UNJ-3A .125 3.750 2.375 1.250TABLE 1B - DIMENSIONS U-ZDASHNO./5/URAD VWAPPROXXAPPROXY+.047-.000Z+.047-.000WEIGHT, LB/EA, APPROX, REFSTEELALALLOYTIALLOY-2 .063 .313 .313 .188 .813 1.344 .048 .017 .027-3 .063 .375 .313 .250 .938 1.422 .064 .023 .036-4 .063 .
11、438 .375 .250 .969 1.531 .071 .025 .040-5 .063 .500 .500 .313 1.063 1.563 .102 .038 .058-6 .094 .563 .500 .313 1.094 1.719 .123 .054 .070-8 .094 .750 .625 .438 1.344 2.000 .237 .091 .136-10 .125 .875 .750 .438 1.563 2.344 .400 .133 .230-12 .125 1.063 .875 .500 1.719 2.578 .530 .190 .305-16 .125 1.31
12、3 1.063 .625 1.813 2.688 .920 .310 .530-20 .188 1.625 1.250 .750 2.125 3.000 1.330 .524 .767-24 .188 1.875 1.438 .875 2.359 3.359 1.960 .700 1.130-32 .188 2.563 1.938 1.188 2.438 4.063NOTES:NOTICETHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF
13、 YOU HAVE QUESTIONS CONCERNING CADMIUMS USE.1. MATERIAL:SEE PROCUREMENT SPECIFICATIONALLOY STEELALUMINUM ALLOYCORROSION RESISTANT STEELTITANIUM ALLOY2. FINISH: SEE PROCUREMENT SPECIFICATION.3. BREAK EDGES .003 TO .015, UNLESS OTHERWISE SPECIFIED.4. DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPECIFIE
14、D, TOLERANCES: DECIMALS .016, ANGLES 030.AEROSPACE STANDARDAS21908SHEET 3 OF 4REV.EELBOW, BULKHEAD UNIVERSAL 90, FLARELESS TUBE/5/ PART NUMBERS:MATERIAL CODE DASH “-” IN PART NUMBER FOR 4130 ALLOY STEEL.ADD MATERIAL CODE “V(SIZE)P” IN PLACE OF DASH FOR CORROSION RESISTANT STEEL (15-5PH), CADMIUM PLA
15、TED. ADD MATERIAL CODE “V” IN PLACE OF DASH FOR CORROSION RESISTANT STEEL (15-5PH), NOT CADMIUM PLATED.ADD MATERIAL CODE “D” IN PLACE OF DASH FOR ALUMINUM ALLOY (2014).ADD MATERIAL CODE “W” IN PLACE OF DASH FOR ALUMINUM ALLOY (7075).ADD MATERIAL CODE “J” IN PLACE OF DASH FOR CORROSION RESISTANT STEE
16、L (TYPE 304).ADD MATERIAL CODE “K” IN PLACE OF DASH FOR CORROSION RESISTANT STEEL (TYPE 316).ADD MATERIAL CODE “R” AFTER DASH NUMBER FOR CORROSION RESISTANT STEEL (TYPE 321).ADD MATERIAL CODE “S” AFTER DASH NUMBER FOR CORROSION RESISTANT STEEL (TYPE 347). (INACTIVE)ADD MATERIAL CODE “T” AFTER DASH N
17、UMBER FOR TITANIUM ALLOY (6Al-4V).EXAMPLES OF PART NUMBERS:MS21908-4 ELBOW, .250 TUBING, 4130 ALLOY STEEL. MS21908V4P ELBOW, .250 TUBING, CORROSION RESISTANT STEEL (15-5PH), CADMIUM PLATED. SEE TABLE 2 /A/.MS21908V4 ELBOW, .250 TUBING, CORROSION RESISTANT STEEL (15-5PH), NOT CADMIUM PLATED.MS21908D4
18、 ELBOW, .250 TUBING, ALUMINUM ALLOY (2014). SEE TABLE 2 /C/.MS21908W4 ELBOW, .250 TUBING, ALUMINUM ALLOY (7075).MS21908J4 ELBOW, .250 TUBING, CORROSION RESISTANT STEEL (TYPE 304).MS21908K4 ELBOW, .250 TUBING, CORROSION RESISTANT STEEL (TYPE 316).MS21908-4R ELBOW, .250 TUBING, CORROSION RESISTANT STE
19、EL (TYPE 321).MS21908-4S ELBOW, .250 TUBING, CORROSION RESISTANT STEEL (TYPE 347). SEE TABLE 2 /D/.MS21908-4T ELBOW, .250 TUBING, TITANIUM ALLOY (6AL-4V)6. PART MARKING: SEE PROCUREMENT SPECIFICATION.7. DIMENSIONING AND TOLERANCING: ANSI Y14.5M-1982.8. REFERENCED DOCUMENTS SHALL BE OF THE ISSUE IN E
20、FFECT ON DATE OF INVITATIONS FOR BID.9. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD SHALL TAKE PRECEDENCE./10/ PROCUREMENT SPECIFICATION: AS18280 EXCEPT AS SPECIFIED ON THIS STANDARD. PRODUCT SUPPLIED TO THIS SPECIFICATION S
21、HALL BE MANUFACTURED BY AN ACCREDITED MANUFACTURER LISTED IN THE PERFORMANCE REVIEW INSTITUTE (PRI) QUALIFIED PRODUCTS LIST (QPL) PRI-QPL-AS18280 FOR THIS STANDARD. SEE www.eAuditN FOR CURRENT QPL ON-LINE.11. SURFACE TEXTURE: SYMBOLS PER ASME Y14.36M: REQUIREMENTS PER ASME B46.1: UNLESS OTHERWISE SP
22、ECIFIED,MACHINED SURFACES SHALL BE 125 MICROINCHES.12. REVISION INDICATOR: A CHANGE BAR ( l ) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT EDITORIAL CHANGES, HAVE BEEN MADE TO THE PREVIOUS ISSUE OF THIS DOCUMENT. AN (R) SYMBOL TO THE
23、LEFT OF THE DOCUMENT TITLE INDICATES A COMPLETE REVISION OF THE DOCUMENT, INCLUDING TECHNICAL REVISIONS. CHANGE BARS AND (R) ARE NOT USED IN ORIGINAL PUBLICATIONS, NOR IN DOCUMENTS THAT CONTAIN EDITORIAL CHANGES ONLY.13. INTERPRETATION OF DRAWING PER AS4296.14. FLUID PASSAGE, HOLE CONTOUR: AS4266 (O
24、PTIONAL).15. INVENTORIED PARTS CONFORMING TO THE PREVIOUS LETTER CHANGE MAY BE USED TO DEPLETION.AEROSPACE STANDARDAS21908SHEET 4 OF 4REV.EELBOW, BULKHEAD UNIVERSAL 90, FLARELESS TUBETABLE 2 CANCELLED, SUPERSEDING DOCUMENT AND PART NUMBERSCANCELLEDDOCUMENTNUMBEROLD PARTNUMBERSSUPERSEDINGDOCUMENTNUMB
25、ERRETAINEDMIL-F-18280PART NUMBERSCURRENTAS18280PART NUMBERSMS21908 MS21908-(2 THRU 32) AS21908 MS21908-(2 THRU 32)MS21908 MS21908-(2 THRU 32) AS21908 /A/ MS21908V(2 THRU 32)PMS21908 MS21908C(2 THRU 32) AS21908 /B/ MS21908J(2 THRU 32)MS21908 MS21908C(2 THRU 32) AS21908 /B/ MS21908K(2 THRU 32)MS21908
26、MS21908C(2 THRU 32) AS21908 /B/ MS21908-(2 THRU 32)RMS21908 MS21908D(2 THRU 32) AS21908 MS21908D(2 THRU 32)MS21908 MS21908D(2 THRU 32) AS21908 /C/ MS21908W(2 THRU 32)MS21908 MS21908W(2 THRU 32) AS21908 MS21908W(2 THRU 32)MS21908 MS21908J(2 THRU 32) AS21908 MS21908J(2 THRU 32)MS21908 MS21908K(2 THRU
27、32) AS21908 MS21908K(2 THRU 32)MS21908 MS21908-(2 THRU 32)R AS21908 MS21908-(2 THRU 32)RMS21908 MS21908-(2 THRU 32)S AS21908 /D/ MS21908-(2 THRU 32)RMS21908 MS21908-(2 THRU 32)T AS21908 MS21908-(2 THRU 32)T16. EXPLANATORY NOTES:/A/ MATERIAL CODE “V(SIZE)P” FOR CADMIUM PLATED 15-5PH CORROSION RESISTA
28、NT STEEL IS RECOMMENDED AS A REPLACEMENT FOR MATERIAL CODE “-” WHEN HIGH STRENGTH MATERIAL IS NEEDED./B/ MATERIAL CODE “C” FOR CORROSION RESISTANT STEEL (TYPE 303) IS REPLACED BY MATERIAL CODES “J”, “K,” OR “R” FOR CORROSION RESISTANT STEEL (TYPE 304), (TYPE 316), OR (TYPE 321) RESPECTIVELY), AT SUP
29、PLIERS OPTION. (INACTIVATED ON MS21900 SERIES STANDARDS 27 JUNE 1969.)/C/ MATERIAL CODE “W” FOR ALUMINUM ALLOY 7075 IS RECOMMENDED AS A REPLACEMENT FOR MATERIAL CODE “D” FOR ALUMINUM ALLOY 2014 IN HYDRAULIC APPLICATIONS WHERE HIGHER STRENGTH PROPERTIES AND SUPERIOR CORROSION RESISTANCE IS REQUIRED./D/ MATERIAL CODE “S” FOR CORROSION RESISTANT STEEL (TYPE 347) IS REPLACED BY MATERIAL CODE “R” FOR CORROSION RESISTANT STEEL (TYPE 321). (BY MIL-F-18280E DATED 11 MAY 1987.)
