1、 AEROSPACE STANDARD FITTING, UNION, REDUCER/EXPANDER BULKHEAD, FLARELESS AND SHORT FLARELESS AS4681Copyright 2017 SAE International All 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, ph
2、otocopying, recording, or otherwise, 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.org ISSUED1992-07 REAFFIRMED2004-07
3、 REVISED2017-09THIRD ANGLE PROJECTION CUSTODIAN: G-3/G-3B REV.CFEDERAL SUPPLY CLASS 4730 AS4681 SHEET 1 OF 4 REV. C PROCUREMENT SPECIFICATION: AS18280 /4/ SAETechnicalStandardsBoard Rulesprovidethat:“Thisreportispublished bySAEto advance the state oftechnicaland engineering sciences.The use ofthisre
4、portisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarising therefrom,isthe sole responsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhich time itmaybe revised,reaffirmed,stabilized,orcancelled.SAEinvitesyourwritten comm
5、entsandsuggestions.SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS4681C RATIONALE ADDED CONDUCTIVE HIGH PURITY ALUMINUM COATING FOR ALUMINUM ALLOY FITTINGS. . FIGURE 1 - FITTING, UNION, REDUCER, BULKHEAD, FLARELESS END SHOWN AS REDUCER FIG
6、URE 2 - FITTING, UNION, EXPANDER, BULKHEAD, BULKHEAD END SHOWN AS REDUCER AEROSPACE STANDARD AS4681 SHEET 2 OF 4 REV. C FITTING, UNION, REDUCER/EXPANDER BULKHEAD, FLARELESS AND SHORT FLARELESS TABLE 1 - PORT SIZES, CORRESPONDING THREADS, HEX SIZES AND DRILL DEPTH BASIC NO. AS4681 /17/ PORT SIZE (NOM
7、INAL TUBE SIZE) T THREAD PER AS8879 CLASS 3A B C H1 H2 K1 K2 04 .250 .4375-20UNJF - - - - - - 06 .375 .5625-18UNJF - - - - - - 08 .500 .7500-16UNJF - - - - - - 10 .625 .8750-14UNJF - - - - - - 12 .750 1.0625-12UNJ - - - - - - 16 1.000 1.3125-12UNJ - - - - - - 20 1.250 1.5625-12UNJ .650 1.284 1.865-1
8、.880 1.615-1.630 1.855 1.605 24 1.500 1.8125-12UNJ .682 1.312 2.115-2.130 1.865-1.880 2.105 1.855 TABLE 2 - DIMENSIONS PORT #1 SIZE A PORT #2 SIZE FLARELESS /6/ 04 A PORT #2 SIZE FLARELESS /6/ 06 A PORT #2 SIZE FLARELESS /6/ 08 A PORT #2 SIZE FLARELESS /6/ 10 A PORT #2 SIZE FLARELESS /6/ 12 A PORT #
9、2 SIZE FLARELESS /6/ 16 A PORT #2 SIZE FLARELESS /6/ 20 A PORT #2 SIZE FLARELESS /6/ 24 04 - - - - - - 1.914 - 06 - - - - - - 1.960 - 08 - - - - - - 2.101 - 10 - - - - - - 2.242 - 12 - - - - - - 2.351 2.414 16 - - - - - - 2.351 2.414 20 1.952 1.968 2.061 2.125 2.187 2.187 - 2.025 24 - - - - 2.250 2.
10、250 2.025 - NOTES NOTICE THIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE QUESTIONS CONCERNING CADMIUMS USE. /1/ MATERIAL: a. CODE LETTER T: TYPE 6Al-4V TITANIUM ALLOY BAR PER AMS4928 b. CODE LETTER V: TYPE 15-5PH CORROSION RESISTANT S
11、TEEL BAR PER AMS5659 c. CODE LETTER W: TYPE 7075-T7351 ALUMINUM ALLOY BAR PER AMS4124 2. HEAT TREATMENT: a. MATERIAL CODE LETTER T: NONE b. MATERIAL CODE LETTER V: HEAT TREAT TO CONDITION H-1075 PER AMS2759/3 c. MATERIAL CODE LETTER W: NONE AEROSPACE STANDARD AS4681 SHEET 3 OF 4 REV. C FITTING, UNIO
12、N, REDUCER/EXPANDER BULKHEAD, FLARELESS AND SHORT FLARELESS /3/ FINISH: a. MATERIAL CODE LETTER T - FLUORIDE PHOSPHATE CONVERSION COAT PER AMS2486 b. MATERIAL CODE LETTER V: (1) V CODE PARTS TO BE PASSIVATED ONLY WILL HAVE NO FINISH CODE LETTER AFTER THE SIZE CODE IN THE PART NUMBER. THE FINISH WILL
13、 BE: PASSIVATE PER AMS2700 TYPE 2 OR 8. (2) V CODE PARTS TO BE CADMIUM PLATED ONLY WILL HAVE THE FINISH CODE LETTER “P” AFTER THE SIZE CODE IN THE PART NUMBER. THE FINISH WILL BE: CADMIUM PLATE PER AMS-QQ-P-416, TYPE II, CLASS 2. c. MATERIAL CODE LETTER W: (1) W CODE PARTS TO BE ANODIZED ONLY WILL H
14、AVE NO FINISH CODE LETTER AFTER THE SIZE CODE IN THE PART NUMBER. THE FINISH WILL BE ANODIZE PER AMS2472 OR PER MIL-A-8625, TYPE II, CLASS 2 DYED BROWN, SIMILAR TO COLOR 10080 OF AMS-STD-595. (2) W CODE PARTS TO BE COATED WITH HIGH PURITY ALUMINUM ONLY WILL HAVE THE FINISH CODE LETTER “V” AFTER THE
15、SIZE CODE IN THE PART NUMBER. SEE PROCUREMENT SPECIFICATION FOR REQUIREMENTS. /4/ PROCUREMENT SPECIFICATION: AS18280 EXCEPT AS SPECIFIED ON THIS STANDARD. PRODUCT SUPPLIED TO THIS SPECIFICATION SHALL BE MANUFACTURED BY AN ACCREDITED MANUFACTURER AS LISTED IN THE PERFORMANCE REVIEW INSTITUTE (PRI) QU
16、ALIFIED PRODUCTS LIST (QPL) PRI-QPL-AS18280 FOR THIS STANDARD. SEE www.eAuditN FOR CURRENT QPL ONLINE. /5/ IDENTIFICATION AT LOCATION SHOWN: MARK PER AS478 CLASS C OR D OR METHOD 7A3, 15A3, OR 15B. MANUFACTURERS NAME, TRADEMARK OR CAGE CODE, BASIC PART NUMBER AND MATERIAL CODE LETTER. /6/ THE LARGES
17、T PORT DETERMINES THE HEX SIZE. WHEN PORT #1 IS LARGER, USE H1 AND K1 DIMENSIONS. WHEN PORT #2 IS LARGER, USE H2 AND K2 DIMENSIONS. ONLY FITTINGS WITH PORT #2 OF SIZE 20 OR 24 SHORT FLARELESS FITTING ENDS ARE SHOWN ON THIS STANDARD. SIZES 16 AND UNDER ARE STANDARD FLARELESS FITTING EHDS. FITTING POR
18、T SIZES SIZE 20 AND LARGER SHALL BE SHORT FLARELESS ONLY. FOR HEX SIZE H1 AND H2 THE SHORT FLARLESS END IS NOT INTENDED TO BE USED ON AS5202 TYPE O-RING BOSSES, SO THE HEX SIZE IS SMALLER THAN USED FOR BOSS APPLICATIONS. FOR REDUCER FITTINGS THE HEX SIZE IS THE SAME AS USED ON THE AS4664 BULKHEAD SH
19、ORT FLARELESS UNION. 7. INTENDED USE: THIS PART IS DESIGNED FOR USE IN TUBE CONNECTION SYSTEMS WITH NOMINAL OPERATING PRESSURES AS FOLLOWS: a. SIZES -20 AND -24 TITANIUM ALLOY AND CORROSION RESISTANT STEEL AT 3000 PSI b. SIZES -20, AND -24, ALUMINUM ALLOY AT 600 PSI /8/ FINISH CODE LETTER “P” SHALL
20、BE PLACED AFTER SIZE CODES ONLY FOR MATERIAL CODE “V” PARTS THAT ARE TO BE CADMIUM PLATED. FINISH CODE LETTER “V” SHALL BE PLACED AFTER SIZE CODES ONLY FOR MATERIAL CODE “W” PARTS THAT ARE TO BE COATED WITH HIGH PURITY ALUMINUM TO PROVIDE LOW ELECTRICAL CONTACT RESISTANCE. NO OTHER LETTERS ARE TO FO
21、LLOW THE SIZE CODES. 9. REVISION INDICATOR: A CHANGE BAR (I) 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 LEFT OF THE DOCUMENT TITLE INDICA
22、TES 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. 10. INVENTORIED PARTS CONFORMING TO THE PREVIOUS “LETTER CHANGE” MAY BE USED TO DEPLETION. 11. INTERPRETATION OF DR
23、AWING PER AS4296. 12. SURFACE TEXTURE: SYMBOLS PER ASME Y14.36M. REQUIREMENTS PER ASME B46.1. UNLESS OTHERWISE SPECIFIED, MACHINED SURFACES TO BE 125 MICROINCHES Ra. HEX FLAT SURFACES MAY BE 250 MICROINCHES Ra. 13. BREAK EDGES .003 TO .015, UNLESS OTHERWISE SPECIFIED. 14. DIMENSIONING AND TOLERANCIN
24、G: ANSI Y14.5M-1982. 15. DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES: LINEAR DIMENSIONS .010, ANGULAR DIMENSIONS 5. AEROSPACE STANDARD AS4681 SHEET 4 OF 4 REV. C FITTING, UNION, REDUCER/EXPANDER BULKHEAD, FLARELESS AND SHORT FLARELESS PMATERIAL CODE LETTER /1/FINISH CODE LETTER /3/ /8/SIZE CODE, TUBE SIZE OF PORT #1 IN .062 INCREMENTSSIZE CODE, TUBE SIZE OF PORT #2 IN .062 INCREMENTSBASIC PART NUMBERAS4681 V 20 1616. HEX CORNER ROUNDING OF PARTS MACHINED FROM ROUND BAR SHALL NOT EXCEED LIMITS OF ARP1942. /17/ EXAMPLE OF PART NUMBER:
