1、SAE Technical Standards Board Rules providethat: “This report is published by SAE to advancethe state oftechnical and engineering sciences.Theuse ofthis reportisentirelyvoluntary, andits applicabilityand suitabilityfor any particularuse,including any patentinfringement arising therefrom,isthe sole r
2、esponsibility of the user.”SAE reviews each technical reportatleastevery five years atwhich timeitmay bereaffirmed,revised, or cancelled.SAE invites your written comments and suggestions.SHEET 1 OF 7AS90708THIRD ANGLE PROJECTIONAEROSPACE STANDARDAS90708ISSUED 2001-10RING, RETAINING, EXTERNAL,INTERLO
3、CKINGCUSTODIAN: SAE E-25FEDERAL SUPPLY CLASS 5365NOTICETHIS DOCUMENT HAS BEEN TAKEN DIRECTLY FROM U.S. MILITARY SPECIFICATION MS90708C AND CONTAINS ONLY MINOR EDITORIAL AND FORMAT CHANGES REQUIRED TO BRING IT INTO CONFORMANCE WITH THE PUBLISHING REQUIREMENTS OF SAE TECHNICAL STANDARDS. THE INITIAL R
4、ELEASE OF THIS DOCUMENT IS INTENDED TO REPLACE MS90708C. ANY PART NUMBERS ESTABLISHED BY THE ORIGINAL SPECIFICATION REMAIN UNCHANGED.THE ORIGINAL MILITARY SPECIFICATION WAS ADOPTED AS AN SAE STANDARD UNDER THE PROVISIONS OF THE SAE TECHNICAL STANDARDS BOARD (TSB) RULES AND REGULATIONS (TSB 001) PERT
5、AINING TO ACCELERATED ADOPTION OF GOVERNMENT SPECIFICATIONS AND STANDARDS. TSB RULES PROVIDE FOR (A) THE PUBLICATION OF PORTIONS OF UNREVISED GOVERNMENT SPECIFICATIONS AND STANDARDS WITHOUT CONSENSUS VOTING AT THE SAE COMMITTEE LEVEL, AND (B) THE USE OF THE EXISTING GOVERNMENT SPECIFICATION OR STAND
6、ARD FORMAT.UNDER 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 SAE TECHNICAL DOCUME
7、NT.REAFFIRMED2006-05 Copyright 2006 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, photocopying, recording, or otherwise, without the prior written permission of S
8、AE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org RATIONALE THIS DOCUMENT HAS BEEN REAFFIRMED TO COMPLY WITH THE SAE 5-YEAR REVIEW POLICY. Copyright SAE Internati
9、onal Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RING, RETAINING, EXTERNAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 2 OF 7AS90708REQUIREMENTS FOR ACQUIRING THE PRODUCT(S) DESCRIBED HEREIN SHALL CONSIST OF THIS SPECIFICATI
10、ON SHEET AND THE ISSUE OF THE FOLLOWING SPECIFICATION LISTED IN THAT ISSUE OF THE DODISS SPECIFIED IN THE SOLICITATION: MIL-R-21248TABLE I. DIMENSIONSCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-R
11、ING, RETAINING, EXTERNAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 3 OF 7AS90708REQUIREMENTS:1. CLASSIFICATION: RETAINING RINGS FURNISHED UNDER THIS STANDARD SHALL BE TYPE I, CLASS 8 OF THE PROCUREMENT SPECIFICATION.2. MATERIAL:a. CARBON SPRING STEEL, GRADE 1060 THRU 1095 (UNS G10600 THRU G10950) I
12、N ACCORDANCE WITH ASTM A568 OR ASTM A682.b. CORROSION RESISTANT STEEL IN ACCORDANCE WITH AMS 5520 (UNS S15700).c. BERYLLIUM COPPER ALLOY NUMBER 170 (UNS C17000) OR ALLOY NUMBER 172 (UNS C17200) IN ACCORDANCE WITH ASTM B194.3. HARDNESS:TABLE II. HARDNESS4. PROTECTIVE FINISH OR SURFACE TREATMENT:a. CA
13、RBON STEEL SHALL BE AS SPECIFIED (SEE TABLE III OR IV):1. CADMIUM PLATE IN ACCORDANCE WITH QQ-P-416, TYPE II, CLASS 3 OR ASTM B696, TYPE II, CLASS 5 OR ZINC-NICKEL PLATE IN ACCORDANCE WITH AMS 2417, TYPE 2.2. ZINC COAT IN ACCORDANCE WITH ASTM B633, TYPE II, CLASS Fe/Zn5, OR ASTM B695, TYPE II, CLASS
14、 5.3. PHOSPHATE COAT IN ACCORDANCE WITH DOD-P-16232, TYPE Z, CLASS 2.b. CORROSION RESISTANT STEEL SHALL BE CLEANED, DESCALED AND PASSIVATED IN ACCORDANCE WITH QQ-P-35.5. PART NUMBER: THE BASIC MS PART NUMBER IS FOLLOWED BY A DASH NUMBER TAKEN FROM TABLE III OR IV.EXAMPLE: MS90708-1200 IS THE PART NU
15、MBER FOR A CARBON STEEL CADMIUM PLATE, EXTERNALINTERLOCKING RETAINING RING FOR USE ON A 2.000 DIAMETER SHAFTNOTES:1. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE IN INCHES.2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS DOCUMENT AND THE REFERENCES CITED HEREIN, THE TEXT OF THIS DOCUMENT SHA
16、LL TAKE PRECEDENCE.3. UNLESS OTHERWISE SPECIFIED, ISSUES OF REFERENCED DOCUMENTS ARE THOSE IN EFFECT AT THE TIME OF SOLICITATION.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RING, RETAINING, EXTER
17、NAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 4 OF 7AS90708TABLE III. DASH NUMBERS FOR MS90708TABLE IV. SUBSTITUTION TABLE (CROSS REFERENCE OF PART NUMBERS)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IH
18、S-,-,-RING, RETAINING, EXTERNAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 5 OF 7AS90708RECOMMENDED DESIGN LIMITATIONS AND USAGEa. INTENDED USE TO PROVIDE HIGH CIRCULAR SHOULDERS FOR POSITIONING AND RETAINING MACHINE COMPONENTS ON SHAFTS. THE IDENTICAL SEMI-CIRCULAR HALVES HELD TOGETHER BY THE INTER
19、LOCKING PRONGS FORM A BALANCED RING CONCENTRIC WITH THE SHAFT, WHICH WILL WITHSTAND HIGH ROTATIONAL SPEEDS. THE USE OF THE FOLLOWING FORMULAS IS BASED ON THE FACT THAT THE RING MATERIAL WILL NOT FAIL IN COMPRESSION.LIMITATION ON USE THE FOLLOWING FORMULAS ARE NOT TO BE USED FOR BRITTLE MATERIALS SUC
20、H AS CAST IRON, ETC.WARNING RING HALVES SHOULD NOT BE OVER EXPANDED DURING INSTALLATION SINCE THIS WILL LEAD TO RING FAILURE. IF RING HAS PLAY BETWEEN THE GROOVE DIAMETER AND THE INSIDE RING DIAMETER THIS INDICATES THAT THE RING HAS BEEN OVER EXPANDED, (PROVIDING GROOVE HAS BEEN MACHINED TO RECOMMEN
21、DED DIMENSIONS).FOR APPROXIMATE SAFETY RPM LIMITS SEE TABLE V.TABLE V. APPROXIMATE SAFETY RPW LIMITSb. ALLOWABLE THRUST LOAD CAPACITY OF THE RINGS. ABUTTING COMPONENTS TO HAVE SHARP CORNERS =WHERE:P = ALLOWABLE THRUST LOAD (POUNDS)S = SHAFT DIAMETER (INCHES)T = THICKNESS (INCHES)X = ULTIMATE SHEAR S
22、TRENGTH OF THE RING MATERIAL (PSI) 1/F = FACTOR OF SAFETY, F = 3, IS RECOMMENDED TO INSURE A SAFE WORKING LOADCF= CONVERSION FACTOR, CF = 3/4 IS RECOMMENDED SINCE SHEAR AREA IS REDUCED AT THECUTOUTS IN THE RINGc. ALLOWABLE LOAD CAPACITY OF GROOVE WALL =WHERE:P = ALLOWABLE THRUST LOAD (POUNDS)S = SHA
23、FT DIAMETER (INCHES)d = GROOVE DEPTH (INCHES)Y = YIELD STRENGTH IN COMPRESSION OF THE GROOVE MATERIALF = FACTOR OF SAFETY, F = 2, IS RECOMMENDED TO INSURE A SAFE WORKING LOADCF= CONVERSION FACTOR, CF = 3/4 IS RECOMMENDED SINCE CONTACT AREA IN THE GROOVE WALLIS REDUCED AT THE CUTOUTS IN THE RINGd. MI
24、NIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT =WHERE:Z = MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT (INCHES)d = GROOVE DEPTH (INCHES)1/ X = 150,000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS OF CARBON STEEL OR CORROSION RESISTANTSTEEL.X = 110,000 PSI ULTIMATE SHEAR STRENGTH F
25、OR RINGS OF BERYLLIUM COPPER.PCF STXF-=PCF SdXF-=Z 3d=Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RING, RETAINING, EXTERNAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 6 OF 7AS90708e. ALLOWABLE SH
26、AFT DIAMETER =WHERE:S = ALLOWABLE SHAFT DIAMETERG = GROOVE DIAMETERF = FACTOR OF SAFETY SEE FORMULA (c) ABOVEP = DESIGN LOADY = YIELD STRENGTH IN COMPRESSION OF GROOVE MATERIAL (PSI)CF= CONVERSION FACTOR, SEE FORMULA (c) ABOVEf. DIFFERENTIAL ROTATION =DIFFERENTIAL ROTATION OF RING AND ADJACENT PART
27、CREATES NO ELEMENT OF RISK IN THE APPLICATION OF THE RING UP TO THE ALLOWABLE LOAD CALCULATED TO THE ABOVE FORMULA (b).g. IMPACT CAPACITY OF RING OR GROOVE WALL =WHERE:P = ALLOWABLE THRUST LOAD OF RING OR GROOVES (POUNDS)T = RING THICKNESS (INCHES)IG= IMPACT CAPACITY OF GROOVE WALL (INCH POUNDS)d =
28、GROOVE DEPTH (INCHES)IR= IMPACT CAPACITY OF RING (INCH POUNDS)h. LOAD CAPACITY, WITH THE RETAINED PART RADIUSED OR CHAMFERED, WHEN THE RETAINED PART DOES NOT EXCEED THE MAXIMUM RADIUS ALLOWED FOR THE BOTTOM OF THE RING GROOVE, THE LESSER LOAD CAPACITY COMPUTED FROM THE FORMULAS ON PAGE 5 WILL APPLY.
29、 THE CORNER RADII AND CHAMFERS LISTED ON PAGE 2 WERE CHOSEN AS LARGE AS POSSIBLE FOR THE RING SIZES INVOLVED AND ARE RELAED TO THE MAXIMUM THRUST LOADS LISTED IN TABLE VI. IF THE CORNER RADII OR CHAMFERS ARE SMALLER THAN THOSE LISTED, THEN THE THRUST LOADS INCREASE PROPORTIONALLY IN ACCORDANCE WITH
30、THE FOLLOWING FORMULAS:WHERE:P1= NEW ALLOWABLE THRUST LOADP = LISTED ALLOWABLE THRUST LOADCH1= NEW (SMALLER) CHAMFERCH = LISTED CHAMFERR1= NEW (SMALLER) CORNER RADIUSR = LISTED CORNER RADIUSSG2 4FPYCF-+=IRPT2- FOR THE RING (INCH POUNDS).=ABUTTING COMPONENTS TO HAVE SHARP CORNERSIGPd2- FOR THE GROOVE
31、 (INCH POUNDS)=P1 PCHCH1- o r=P1 PRR1-=Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RING, RETAINING, EXTERNAL,INTERLOCKINGAEROSPACE STANDARDAS90708SHEET 7 OF 7AS90708LIMIT LOADS LISTED BELOW ARE B
32、ASED ON RINGS OF STEEL (WORKING STRESS 250,000 PSI) AND OF BERYLLIUM COPPER (WORKING STRESS 180,000 PSI). IF THE ALLOWABLE GROOVE CAPACITY LOADS AS CALCULAT4ED BY USING THE FORMULA GIVEN ABOVE ARE LESS, THEN THEY SHOULD BE USED.TABLE VI. LIMIT LOADSCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
