1、 AEROSPACE STANDARD RING, RETAINING, EXTERNAL, INTERLOCKING AS90708Copyright 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, photocopying, recording, or otherw
2、ise, 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 ISSUED2001-10REAFFIRMED 2006-05REVISED2017-06THIRD ANGLE PROJEC
3、TION CUSTODIAN: E-25 REV.BFEDERAL SUPPLY CLASS 5325 AS90708 SHEET 1 OF 8 REV. B PROCUREMENT SPECIFICATION: MIL-DTL-21248 SAETechnicalStandardsBoard Rulesprovidethat:“Thisreportispublished bySAEto advance the state oftechnicaland engineering sciences.The use ofthisreportisentirelyvoluntary,anditsappl
4、icabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarising therefrom,isthe sole responsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfive yearsatwhich time itmaybe revised,reaffirmed,stabilized,orcancelled.SAEinvitesyourwritten commentsandsuggestions.SAE values you
5、r input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS90708B RATIONALE UPDATE MATERIAL SPECIFICATION REFERENCE AND CLARIFIED CROSS-REFERENCES. NOTICE THE INITIAL SAE PUBLICATION OF THIS DOCUMENT WAS TAKEN DIRECTLY FROM U.S. MILITARY STANDARD MS90708C. THIS SAE
6、 STANDARD MAY RETAIN THE SAME PART NUMBERS ESTABLISHED BY THE ORIGINAL MILITARY DOCUMENT. ANY REQUIREMENTS ASSOCIATED WITH QUALIFIED PRODUCTS LISTS (QPLS) MAY CONTINUE TO BE MANDATORY FOR DOD CONTRACTS. REQUIREMENTS RELATING TO QPLS HAVE NOT BEEN ADOPTED BY THE SAE FOR THIS STANDARD AND ARE NOT PART
7、 OF THIS SAE DOCUMENT. G SW90 1+-T S GA DA DA DEEEALTERNATIVE DESIGN No 1WITH TAPERED BRIDGEALTERNATIVE DESIGN No 2WITH PLIER TIP NOTCHESTO FACILITATE ASSEMBLYGROOVE BOTTOM RADII ( MAX)1.125 THRU 2.000 = .010.469 THRU 1.000 = .0052.125 THRU 3.375 = .015RETAINING RINGRETAINED PARTCHAMFER RENLARGED VI
8、EW AENLARGED DETAILSAFIGURE 1 AEROSPACE STANDARD AS90708 SHEET 2 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING THE COMPLETE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THIS DOCUMENT AND THE LATEST ISSUE OF MIL-DTL-21248. TABLE 1 DIMENSIONS S SHAFT (REF) D FREE (REF
9、) 1/ A WIDTH ACROSS LUGS E T THICKNESS 2/ G W WIDTH R 4/ CHAMFER 4/ RECOMMENDED GROOVE (REF) OF RETAINED PART (REF) BASIC BASIC TOL BASIC TOL BASIC TOL BASIC TOL BASIC TOL MAX MAX .469 .414 .585 .003 .105 .005 .035 .002 .419 .0015 .004 FIM 3/ .040 +.003 -.000 .052 .040 .500 .459 .625 .105 .035 .464
10、.040 .052 .040 .594 .538 .710 .004 .105 .035 .544 .040 .052 .040 .625 .569 .740 .105 .035 .575 .040 .052 .040 .669 .593 .815 .005 .135 .006 .042 .599 .002 .004 FIM 3/ .047 .065 .050 .750 .673 .894 .135 .042 .680 .047 .065 .050 .781 .703 .925 .135 .042 .711 .047 .065 .050 .875 .796 1.017 .006 .135 .0
11、42 .805 .003 .004 FIM 3/ .047 .065 .050 .984 .863 1.172 .188 .050 .872 .056 +.004 -.000 .086 .066 1.000 .863 1.172 .188 .050 .872 .056 .081 .062 1.125 1.002 1.311 .188 .050 1.013 .003 .005 FIM 3/ .056 .086 .066 1.188 1.064 1.373 .188 .050 1.075 .056 .086 .066 1.250 1.126 1.435 .007 .188 .050 1.138 .
12、056 .086 .066 1.375 1.250 1.559 .188 .050 1.263 .056 .086 .066 1.500 1.374 1.683 .188 .050 1.388 .056 .086 .066 1.562 1.412 1.778 .008 .222 .007 .062 .003 1.427 .005 .005 FIM 3/ .068 .100 .077 1.625 1.474 1.840 .222 .062 1.489 .068 .100 .077 1.750 1.597 1.963 .222 .062 1.614 .068 .100 .077 1.772 1.5
13、97 1.963 .222 .062 1.614 .068 .094 .072 1.875 1.721 2.090 .222 .062 1.739 .068 .100 .077 1.969 1.779 2.209 .262 .078 1.797 .086 +.005 -.000 .114 .088 2.000 1.809 2.242 .010 .262 .078 1.828 .086 .114 .088 2.125 1.933 2.364 .262 .078 1.953 .005 .006 FIM 3/ .086 .114 .088 2.156 1.933 2.364 .262 .078 1.
14、953 .086 .104 .080 2.250 2.057 2.488 .262 .078 2.078 .086 .114 .088 2.375 2.180 2.610 .262 .078 2.203 .086 .114 .088 2.500 2.304 2.734 .262 .078 2.328 .086 .114 .088 2.625 2.428 2.858 .262 .078 2.453 .086 .114 .088 2.750 2.518 3.049 .012 .323 .008 .093 2.544 .006 .006 FIM 3/ .103 .143 .110 2.875 2.6
15、42 3.172 .323 .093 2.669 .103 .143 .110 3.000 2.754 3.294 .329 .093 2.794 .103 .143 .110 3.250 3.013 3.542 .015 .325 .093 3.044 .103 .144 .111 3.375 3.114 3.761 .395 .109 3.145 .120 .182 .140 1/ D = DIMENSION D SHOULD NOT BE USED AS PART OF AN INSPECTION PROCEDURE, USE DIMENSION A. 2/ T = THICKNESS
16、T APPLIES TO UNPLATED RINGS. FOR CORROSION RESISTANT STEEEL AND PLATED RINGS +.002 SHOULD BE ADDED TO THE MAXIMUM TOLERANCE, I.E., .002 SHOULD BE +.004/-.002. 3/ FIM = FULL INDICATOR MOVEMENT; IS THE MAXIMUM ALLOWABLE DEVIATION OF CONCENTRICITY BETWEEN THE GROOVE AND THE SHAFT. 4/ R AND CHAMFER = RA
17、DIUS AND CHAMFER ALLOWABLE ON PARTS TO BE RETAINED BY THE RING. THRUST LOADS FOR RINGS, RETAINING PARTS WITH CORNER RADII OR CHAMFERS ARE TABULATED IN TABLE 6. AEROSPACE STANDARD AS90708 SHEET 3 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING REQUIREMENTS NOTICE THIS DOCUMENT REFERENCES A PART W
18、HICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE QUESTIONS CONCERNING CADMIUMS USE. 1. CLASSIFICATION: RETAINING RINGS FURNISHED UNDER THIS STANDARD SHALL BE TYPE I, CLASS 8 OF THE PROCUREMENT SPECIFICATION MIL-DTL-21248. 2. MATERIAL: a. CARBON SPRING STEEL, GRADE 106
19、0 THROUGH 1095 (UNS G10600 THROUGH G10950) IN ACCORDANCE WITH ASTM A568/A568M OR ASTM A684/A684M. b. CORROSION RESISTANT STEEL IN ACCORDANCE WITH AMS5520 (UNS S15700). c. BERYLLIUM COPPER ALLOY NUMBER 170 (UNS C17000) OR ALLOY NUMBER 172 (UNS C17200) IN ACCORDANCE WITH ASTM B194. 3. HARDNESS: TABLE
20、2 - HARDNESS SHAFT (REF) CARBON STEEL CORROSION RESISTANT STEEL BERYLLIUM COPPER .469 TO .625, INCL 66.5 TO 71.5 HR30N 44.0 TO 51.0 HRC 56.5 TO 62.0 HR30N .669 TO 1.500, INCL 52.5 TO 59.0 HR45N 44.0 TO 51.0 HRC - 1.562 TO 3.375, INCL 48.0 TO 53.0 HRC 44.0 TO 51.0 HRC - .669 TO 1.875, INCL - - 37.0 T
21、O 43.0 HRC 4. PROTECTIVE FINISH OR SURFACE TREATMENT: a. CARBON STEEL SHALL BE AS SPECIFIED (SEE TABLE 3 OR 4): 1. CADMIUM PLATE IN ACCORDANCE WITH AMS-QQ-P-416, TYPE II, CLASS 3 OR ASTM B696, TYPE II, CLASS 5 OR ZINC-NICKEL PLATE IN ACCORDANCE WITH AMS2417, TYPE 2. 2. ZINC COAT IN ACCORDANCE WITH A
22、STM B633, TYPE II, CLASS Fe/Zn5, OR ASTM B695, TYPE II, CLASS 5. 3. PHOSPHATE COAT IN ACCORDANCE WITH MIL-DTL-16232, TYPE Z, CLASS 2. b. CORROSION RESISTANT STEEL SHALL BE CLEANED, DESCALED AND PASSIVATED IN ACCORDANCE WITH AMS2700. 5. PART NUMBER: THE BASIC MS PART NUMBER IS FOLLOWED BY A DASH NUMB
23、ER TAKEN FROM TABLE 3 OR 4. EXAMPLE: MS90708-1200 IS THE PART NUMBER FOR A CARBON STEEL CADMIUM PLATE, EXTERNAL INTERLOCKING RETAINING RING FOR USE ON A 2.000 DIAMETER SHAFT. 6. UNLESS OTHERWISE SPECIFIED, ALL DIMENSIONS ARE IN INCHES. 7. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS DOCUMENT
24、AND THE REFERENCES CITED HEREIN, THE TEXT OF THIS DOCUMENT SHALL TAKE PRECEDENCE. 8. UNLESS OTHERWISE SPECIFIED, ISSUES OF REFERENCED DOCUMENTS ARE THOSE IN EFFECT AT THE TIME OF SOLICITATION. 9. UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF THE APPLICABLE DRAWING
25、OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED. AEROSPACE STANDARD AS90708 SHEET 4 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING TABLE 3 - DASH NUMBERS FOR MS90708 S SHAFT (REF) CARBON STEEL CADMIUM PLATE OR ZINC NICKEL PLATE 1/ CARBON STEEL ZINC COAT 1/ CARBON STEEL PHOSPHA
26、TE COAT 1/ STEEL CORROSION RESISTANT BERRYLLIUM COPPER 1/ DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. .469 -1046 -2046 -3046 -4046 -5046 .500 -1050 -2050 -3050 -4050 -5050 .594 -1059 -2059 -3059 -4059 -5059 .625 -1062 -2062 -3062 -4062 -5062 .669 -1066 -2066 -3066 -4066 -5066 .750 -1075 -2075 -3075
27、 -4075 -5075 .781 -1078 -2078 -3078 -4078 -5078 .875 -1087 -2087 -3087 -4087 -5087 .984 -1098 -2098 -3098 -4098 -5098 1.000 -1098 -2098 -3098 -4098 -5098 1.125 -1112 -2112 -3112 -4112 -5112 1.188 -1118 -2118 -3118 -4118 -5118 1.250 -1125 -2125 -3125 -4125 -5125 1.375 -1137 -2137 -3137 -4137 -5137 1.
28、500 -1150 -2150 -3150 -4150 -5150 1.562 -1156 -2156 -3156 -4156 -5156 1.625 -1162 -2162 -3162 -4162 -5162 1.750 -1175 -2175 -3175 -4175 -5175 1.772 -1175 -2175 -3175 -4175 -5175 1.875 -1187 -2187 -3187 -4187 -5187 1.969 -1196 -2196 -3196 -4196 2.000 -1200 -2200 -3200 -4200 2.125 -1212 -2212 -3212 -4
29、212 2.156 -1212 -2212 -3212 -4212 2.250 -1225 -2225 -3225 -4225 2.375 -1237 -2237 -3237 -4237 2.500 -1250 -2250 -3250 -4250 2.625 -1262 -2262 -3262 -4262 2.750 -1275 -2275 -3275 -4275 2.875 -1287 -2287 -3287 -4287 3.000 -1300 -2300 -3300 -4300 3.250 -1325 -2325 -3325 -4325 3.375 -1337 -2337 -3337 -4
30、337 1/ SUBSTITUTE CORROSION RESISTANT STEEL WHEN USED IN FOOD PROCESSING MACHINERY, OR IN FUEL OR LUBRICATION SYSTEMS, OR WHEN USED AT TEMPERATURES OVER 450 F. AEROSPACE STANDARD AS90708 SHEET 5 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING TABLE 4 - SUBSTITUTION TABLE (CROSS REFERENCE OF PART
31、 NUMBERS) S SHAFT (REF) INACTIVE SUBSTITUTE SUBSTITUTE SUBSTITUTE CARBON STEEL CARBON STEEL CADMIUM PLATE OR ZINC NICKEL PLATE 1/ CARBON STEEL ZINC COAT 1/ CARBON STEEL PHOSPHATE COAT 1/ MS90708 MS90708 MS90708 MS90708 .469 -46 -1046 -2046 -3046 .500 -50 -1050 -2050 -3050 .594 -59 -1059 -2059 -3059
32、.625 -62 -1062 -2062 -3062 .669 -66 -1066 -2066 -3066 .750 -75 -1075 -2075 -3075 .781 -78 -1078 -2078 -3078 .875 -87 -1087 -2087 -3087 .984 -98 -1098 -2098 -3098 1.000 -98 -1098 -2098 -3098 1.125 -112 -1112 -2112 -3112 1.188 -118 -1118 -2118 -3118 1.250 -125 -1125 -2125 -3125 1.375 -137 -1137 -2137
33、-3137 1.500 -150 -1150 -2150 -3150 1.562 -156 -1156 -2156 -3156 1.625 -162 -1162 -2162 -3162 1.750 -175 -1175 -2175 -3175 1.772 -175 -1175 -2175 -3175 1.875 -187 -1187 -2187 -3187 1.969 -196 -1196 -2196 -3196 2.000 -200 -1200 -2200 -3200 2.125 -212 -1212 -2212 -3212 2.156 -212 -1212 -2212 -3212 2.25
34、0 -225 -1225 -2225 -3225 2.375 -237 -1237 -2237 -3237 2.500 -250 -1250 -2250 -3250 2.625 -262 -1262 -2262 -3262 2.750 -275 -1275 -2275 -3275 2.875 -287 -1287 -2287 -3287 3.000 -300 -1300 -2300 -3300 3.250 -325 -1325 -2325 -3325 3.375 -337 -1337 -2337 -3337 1/ SUBSTITUTE CORROSION RESISTANT STEEL WHE
35、N USED IN FOOD PROCESSING MACHINERY, OR IN FUEL OR LUBRICATION SYSTEMS, OR WHEN USED AT TEMPERATURES OVER 450 F. AEROSPACE STANDARD AS90708 SHEET 6 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING RECOMMENDED DESIGN LIMITATIONS AND USAGE a. INTENDED USE TO PROVIDE HIGH CIRCULAR SHOULDERS FOR POSI
36、TIONING AND RETAINING MACHINE COMPONENTS ON SHAFTS. THE IDENTICAL SEMI-CIRCULAR HALVES HELD TOGETHER BY THE INTERLOCKING 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 W
37、ILL NOT FAIL IN COMPRESSION. LIMITATION ON USE THE FOLLOWING FORMULAS ARE NOT TO BE USED FOR BRITTLE MATERIALS SUCH 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
38、 RING DIAMETER, THIS INDICATES THAT THE RING HAS BEEN OVER EXPANDED (PROVIDING GROOVE HAS BEEN MACHINED TO RECOMMENDED DIMENSIONS). FOR APPROXIMATE SAFETY RPM LIMITS SEE TABLE 5. TABLE 5 - APPROXIMATE SAFETY RPM LIMITS SHAFT .500 1.000 1.500 2.000 2.500 3.000 3.375 CARBON STEEL AND CORROSION RESISTA
39、NT STEEL RPM LIMIT 50000 30000 22000 15000 12000 9000 6800 BERYLLIUM COPPER RPM LIMIT 32000 19000 14000 - - - - b. ALLOWABLE THRUST LOAD CAPACITY OF THE RINGS. ABUTTING COMPONENTS TO HAVE SHARP CORNERS = P = CF STX F WHERE: P = ALLOWABLE THRUST LOAD (POUNDS) S = SHAFT DIAMETER (INCHES) T = THICKNESS
40、 (INCHES) X = ULTIMATE SHEAR STRENGTH OF THE RING MATERIAL (PSI) 1/ F = FACTOR OF SAFETY, F = 3, IS RECOMMENDED TO ENSURE A SAFE WORKING LOAD CF= CONVERSION FACTOR, CF= 3/4 IS RECOMMENDED SINCE SHEAR AREA IS REDUCED AT THE CUTOUTS IN THE RING c. ALLOWABLE LOAD CAPACITY OF GROOVE WALL = P = CF SdY F
41、WHERE: P = ALLOWABLE THRUST LOAD (POUNDS) S = SHAFT DIAMETER (INCHES) d = GROOVE DEPTH (INCHES) Y = YIELD STRENGTH IN COMPRESSION OF THE GROOVE MATERIAL (PSI) F = FACTOR OF SAFETY, F = 2, IS RECOMMENDED TO ENSURE A SAFE WORKING LOAD CF= CONVERSION FACTOR, CF= 3/4 IS RECOMMENDED SINCE CONTACT AREA IN
42、 THE GROOVE WALL IS REDUCED AT THE CUTOUTS IN THE RING d. MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT = Z = 3d WHERE: Z = MINIMUM DISTANCE BETWEEN OUTER GROOVE WALL AND END OF SHAFT (INCHES) d = GROOVE DEPTH (INCHES) 1/ X = 150000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS OF CARBON STEEL
43、 OR CORROSION RESISTANT STEEL X = 110000 PSI ULTIMATE SHEAR STRENGTH FOR RINGS OF BERYLLIUM COPPER AEROSPACE STANDARD AS90708 SHEET 7 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING e. ALLOWABLE SHAFT DIAMETER = WHERE: S = ALLOWABLE SHAFT DIAMETER G = GROOVE DIAMETER F = FACTOR OF SAFETY SEE FOR
44、MULA (c) ABOVE P = DESIGN LOAD Y = YIELD STRENGTH IN COMPRESSION OF GROOVE MATERIAL (PSI) CF= CONVERSION FACTOR, SEE FORMULA (c) ABOVE f. DIFFERENTIAL ROTATION = DIFFERENTIAL ROTATION OF RING AND ADJACENT PART CREATES NO ELEMENT OF RISK IN THE APPLICATION OF THE RING UP TO THE ALLOWABLE LOAD CALCULA
45、TED 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 = GROOVE DEPTH (INCHES) IR= IMPACT CAPACITY OF RING (INCH POUNDS) h. LOAD CAPACITY, WI
46、TH THE RETAINED PART RADIUSED OR CHAMFERED: WHEN THE RADIUS OR CHAMFER OF 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 STATED ABOVE WILL APPLY. THE CORNER RADII AND CHAMFERS LISTED IN TABLE 1 WERE
47、CHOSEN AS LARGE AS POSSIBLE FOR THE RING SIZES INVOLVED AND ARE RELATED TO THE MAXIMUM THRUST LOADS LISTED IN TABLE 6. IF THE CORNER RADII OR CHAMFERS ARE SMALLER THAN THOSE LISTED, THEN THE THRUST LOADS INCREASE PROPORTIONALLY IN ACCORDANCE WITH THE FOLLOWING FORMULAS: WHERE: P1= NEW ALLOWABLE THRU
48、ST LOAD P = LISTED ALLOWABLE THRUST LOAD CH1= NEW (SMALLER) CHAMFER CH = LISTED CHAMFER R1= NEW (SMALLER) CORNER RADIUS R = LISTED CORNER RADIUS S G2 4FPYCF-+=IRPT2- FOR THE RING (INCH POUNDS).= =ABUTTING COMPONENTS TO HAVE SHARP CORNERSIGPd2- FOR THE GROOVE (INCH POUNDS)= =P1 PCHCH1- or=P1 PRR1-=AE
49、ROSPACE STANDARD AS90708 SHEET 8 OF 8 REV. B RING, RETAINING, EXTERNAL, INTERLOCKING LIMIT LOADS LISTED IN TABLE 6 ARE BASED ON RINGS OF STEEL (WORKING STRESS 250000 PSI) AND OF BERYLLIUM COPPER (WORKING STRESS 180000 PSI). IF THE ALLOWABLE GROOVE CAPACITY LOADS AS CALCULATED BY USING THE FORMULA GIVEN ABOVE ARE LESS, THEN THEY SHOULD BE USED. TABLE 6 - LIMIT LOADS NOMINAL RING SIZE ALLOWABLE THRUST LOAD (LB) FOR RING ASSEMBLIE
