1、 AEROSPACE STANDARD BEARING, ROLLER, NEEDLE, SINGLE ROW, HEAVY DUTY, TRACK ROLLER, SEALED, TYPE V ANTIFRICTION, INCH AS21438Copyright 2013 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, e
2、lectronic, mechanical, photocopying, 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 ISSUED
3、 1998-07REVISED 2013-01THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.C FEDERAL SUPPLY CLASS 3110 AS21438SUPERSEDES AS24465SHEET 1 OF 4 REV. C PROCUREMENT SPECIFICATION: NONESAE Technical Standards Board Rules provide that: “This report ispublishedby SAE toadvance thestate of technicalandengineering sci
4、ences. Theuse ofthis report is entirely voluntary, andits applicability and suitability forany particular use,including any patent infringement arising therefrom, isthe soleresponsibilityofthe user.”SAE reviews eachtechnicalreport at least every five years at which time itmay bereaffirmed, revised,
5、stabilized or cancelled.SAEinvites yourwrittencomments andsuggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS21438C RATIONALE AS21438 REV C IS A LIMITED SCOPE CHANGE ADDING GRADE B FOR ZINC NICKEL PLATING. NOTICE UNDE
6、R DEPARTMENT OF DEFENSE POLICIES AND PROCEDURES, ANY QUALIFICATION REQUIREMENTS AND ASSOCIATED QUALIFIED PRODUCTS LISTS ARE MANDATORY FOR DOD CONTRACTS. ANY REQUIREMENT RELATING TO QUALIFIED PRODUCTS LISTS (QPLS) HAS NOT BEEN ADOPTED BY SAE AND IS NOT PART OF THIS TECHNICAL REPORT. THE COMPLETE REQU
7、IREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THIS DOCUMENT AND THE LATEST ISSUE OF SAE AS39901. FIGURE 1 AEROSPACE STANDARD AS21438 SHEET 2 OF 4 REV. C BEARING, ROLLER, NEEDLE, SINGLE ROW, HEAVY DUTY, TRACK ROLLER, SEALED, TYPE V ANTIFRICTION, INCH TABLE 1 - DIMENSIONS TABLE
8、2 - TOLERANCE VALUES 1. MATERIAL: a. INNER RING, OUTER RING AND NEEDLES: 52100 STEEL PER AMS6440, AMS6444, AMS6447, OR ASTM A295. b. ENDWASHERS: 52100 STEEL PER AMS6440, AMS6444, AMS6447, OR ASTM A295. AISI 1074 STEEL PER ASTM A684. c. SEALS AND BACKING RINGS - ACETAL RESIN PER ASTM D6778 POM 111 OR
9、 NYLON PER L-P-410, TYPE 6/6, WEAR RESISTANT GRADE, OR POLYESTER ELASTOMER. CONSTRUCTION OPTIONAL. d. RETAINING RINGS: BRASS (OPTIONAL) 2. HEAT TREAT: a. OUTER RING: HARDEN AND TEMPER TO 58-62 HRC b. INNER RING: HARDEN AND TEMPER TO 60-64 HRC OR INDUCTION HARDEN TO 60-64 HRC FOR .015 INCH MINIMUM DE
10、PTH AND 50 HRC AT .030 INCH MINIMUM DEPTH. c. NEEDLES: HARDEN AND TEMPER TO 60-64 HRC d. ENDWASHERS: HARDEN AND TEMPER TO 51-56 HRC AEROSPACE STANDARD AS21438 SHEET 3 OF 4 REV. C BEARING, ROLLER, NEEDLE, SINGLE ROW, HEAVY DUTY, TRACK ROLLER, SEALED, TYPE V ANTIFRICTION, INCH 3. FINISH OR PLATING: a.
11、 OUTER RING - OUTER RING CHROME PLATED PER AMS-QQ-C-320, CLASS 2. O.D. AND O.D. CORNERS .0004 TO .0010 INCH THICKNESS, FACES MINIMUM .0003 INCH THICKNESS. b. INNER RING - ALL EXTERNAL SURFACES BLACK OXIDE PER MIL-DTL-13924. c. ENDPLATES - ALL EXPOSED SURFACES ZINC-NICKEL IN ACCORDANCE AMS2417, TYPE
12、2, GRADE B OR CADMIUM PLATED IN ACCORDANCE WITH AMS-QQ-P-416, TYPE I, CLASS 2, WITH A THICKNESS OF .0003 TO .0006 INCHES. IF ZINC-NICKEL PLATING IS REQUIRED, ADD THE LETTER “E” AFTER THE MS21438 DASH NUMBER. NO CODE DESIGNATES CADMIUM PLATING IS REQUIRED. 4. SURFACE TEXTURE: RACEWAYS - 16 MICROINCHE
13、S MAXIMUM Ra BORE AND O.D. - 40 MICROINCHES MAXIMUM Ra NEEDLE O.D. - 8 MICROINCHES MAXIMUM Ra 5. LUBRICANT: MIL-PRF-81322 OR MIL-PRF-23827. ALL BEARINGS SHALL BE PREPACKED WITH GREASE CONFORMING TO MIL-PRF-81322 UNLESS OTHERWISE SPECIFIED. IF MIL-PRF-23827 TYPE 1 GREASE IS REQUIRED, ADD THE SUFFIX “
14、G” TO THE MS DASH NUMBER. IF MIL-PRF-23827 TYPE 2 GREASE IS REQUIRED, ADD THE SUFFIX “J” TO THE MS DASH NUMBER. 6. MARKING: THE MARKING SHALL CONSIST OF THE MS PART NUMBER AND THE MANUFACTURERS CAGE CODE MARKED IN ACCORDANCE WITH MIL-STD-130 AND A LOT CONTROL NUMBER IF SPACE IS AVAILABLE. 7. PART NU
15、MBER: THE PART NUMBER SHALL CONSIST OF THE MS SPECIFICATION NUMBER FOLLOWED BY A DASH NUMBER TAKEN FROM TABLE 1 AND APPLICABLE SUFFIXES. FINISH SUFFIX TO BE DESIGNATED BEFORE LUBRICANT SUFFIX. EXAMPLE: MS21438-103EG 8. PACKAGING: BEARINGS SHALL BE INDIVIDUALLY PACKAGED TO THE REQUIREMENTS OF MIL-DTL
16、-197. PACKAGE MARKED WITH MANUFACTURERS NAME OR TRADEMARK, AND DATE OF LUBRICATION BY MONTH AND YEAR AND LOT CONTROL NUMBER. 9. DIMENSIONS: ALL DIMENSIONS ARE AFTER PLATING AND ARE IN INCHES. 10. LOAD RATING: THE LIMIT LOAD RATING LISTED CAN BE DEFINED AS THE MAXIMUM RADIAL LOAD WHICH CAN BE APPLIED
17、 TO A BEARING WITHOUT IMPAIRING THE SUBSEQUENT FUNCTIONING OF THE BEARING. THE ULTIMATE OR STATIC FRACTURE LOAD RATING IS NOT LESS THAN 1.5 TIMES THE LIMIT LOAD RATING. THE LOAD RATING AS A TRACK ROLLER IS THE LOAD THE BEARING WILL CARRY AS A TRACK ROLLER FOR AN L -10 LIFE OF 20 000 REVOLUTIONS. 11.
18、 TEMPERATURE: OPERATING TEMPERATURE RANGE -65 TO 350 F FOR MIL-PRF-81322 LUBRICATED BEARINGS OPERATING TEMPERATURE RANGE -65 TO 250 F FOR MIL-PRF-23827 LUBRICATED BEARINGS. 12. REMOVE ALL BURRS AND SHARP EDGES. AEROSPACE STANDARD AS21438 SHEET 4 OF 4 REV. C BEARING, ROLLER, NEEDLE, SINGLE ROW, HEAVY
19、 DUTY, TRACK ROLLER, SEALED, TYPE V ANTIFRICTION, INCH 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. AS21438 SUPERSEDES AS24465. 2. DESIGN FEATURES: FOR DESIGN FEATURE PURPOSES, TH
20、IS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN. 3. REFERENCED DOCUMENTS: REFERENCED DOCUMENTS ARE ISSUES IN EFFECT ON DATE OF INVITATIONS FOR BID. 4. A CHANGE BAR (l) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT EDITORI
21、AL CHANGES, HAVE BEEN MADE TO THE PREVIOUS ISSUE OF THIS DOCUMENT. AN (R) SYMBOL TO THE 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.
