1、AMSC N/A FSC 5325 DETAIL SPECIFICATION SHEET RING, RETAINING, EXTERNAL, “E”, REINFORCED (REDUCED SECTION TYPE) This specification sheet is approved for use by all Departments and Agencies of the Department of Defense. The requirements for acquiring the product described herein shall consist of this
2、specification sheet and procurement specification MIL-R-21248. FIGURE 1. Ring, Retaining. MS3215C 25 October 2011 SUPERSEDING MS3215B 26 April 1990 INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS3215C 2 TABLE I. Dimensions. B SHAFT (REF
3、) D FREE E LARGE SECTION HEIGHT T 1/ THICKNESS G W WIDTH R 3/ CH 3/ Y FREE OUTSIDE RECOMMENDED GROOVE (REF) OF RETAINED PART (REF) INCH MM BASIC TOL (REF) BASIC TOL BASIC TOL BASIC TOL MAX MAX (REF) .094 2.4 .072 +.001 .067 .015 .074 +.002 .020 +.002 .045 .033 .206 .125 3.2 .093 -.003 .089 .015 .095
4、 -.000 .020 -.000 .045 .033 .270 .156 4.0 .113 +.002 -.003 .111 .025 .116 .0015 FIM 2/ .030 .065 .050 .335 .188 4.8 .143 .116 .025 .147 .030 .065 .050 .375 .219 5.6 .182 .003 .132 .025 .188 .002 .030 .065 .050 .446 .250 6.3 .204 .156 .025 .002 .210 .002 FIM 2/ .030 +.003 -.000 .065 .050 .516 .312 7.
5、9 .242 .173 .025 .250 .003 .030 .070 .055 .588 .375 9.5 .292 .184 .035 .303 .003 .040 .070 .055 .660 .438 11.1 .332 .004 .207 .035 .343 FIM 2/ .040 .070 .055 .746 .500 12.7 .385 .212 .042 .396 .003 .047 .080 .060 .810 .562 14.3 .430 .220 .042 .437 .004 FIM 2/ .047 .080 .060 .870 1/ T = Thickness “T”
6、 applies to unplated rings. For corrosion resistant steel and plated rings, +.002 should be added to the maximum tolerance, i.e., .002 should be +.004/-.002. 2/ FIM = (Full Indicator Movement) is the maximum allowable deviation of concentricity between the groove and the shaft. 3/R and CH = Radii or
7、 chamfers allowable on parts to be retained by the rings. Thrust loads of rings, retaining parts with corner radii or chamfers (see note “3 (g)” on page 5.) Requirements: 1. Classification: Retaining rings furnished under this standard shall be Type I, Class 9 of the procurement specification. 2. Ma
8、terial: (a) Carbon steel, grade 1060 thru 1095 (UNS G10600 thru G10950) in accordance with ASTM A568/A568M or ASTM A684/A684M. (b) Corrosion resistant steel in accordance with SAE-AMS 5520 (UNS S15700). (c) Beryllium copper alloy number 170 (UNS C17000) or alloy number 172(UNS C17200) in accordance
9、with ASTM B194. 3. Hardness: TABLE II. Hardness. SHAFT (REF) CARBON STEEL CORROSION RESISTANT STEEL BERYLLIUM COPPER .094 and .125 .156 to .12 incl. .375 to .562 incl. 84.5 87 HR15N 66.5 71 HR30N 47 - 52 HRC 82.5 86 HR15N 63 69.5 HR30N 44 - 51 HRC 77 82 HR15N 54 - 62 HR30N 34 - 43 HRC 4. Protective
10、finish or surface treatment: (a) Carbon steel shall be as specified (see Table III): (1) Cadmium plate in accordance with SAE-AMS-QQ-P-416, Type II, Class 3 or ASTM B696, Type II, Class 5. (2) Zinc coat in accordance with ASTM B633, Type II, Class Fe/Zn5, or ASTM B695, Type II, Class 5. (3) Phosphat
11、e coating accordance with MIL-DTL-16232, Type I, Class 2. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS3215C 3 (b) Corrosion resistant steel shall be cleaned, descaled and passivated in accordance with SAE-AMS2700. 5. Part number: The basic MS p
12、art number is followed by a dash number taken from Table III. Example: MS3215-1025 is the part number for a carbon steel, cadmium plate, external, “E” reinforced, retaining ring for use on a .250 diameter shaft. TABLE III. Dash numbers for MS3215 S SHAFT (REF) CARBON STEEL 1/ CADMIUM PLATE CARBON ST
13、EEL 1/ ZINC COAT CARBON STEEL 1/ PHOSPHATE COAT STEEL, CORROSION RESISTANT BERYLLIUM 1/ COPPER DASH NO. DASH NO. DASH NO. DASH NO. DASH NO. .094 .125 .156 .188 .219 .250 .312 .375 .438 .500 .562 -1009 -1012 -1015 -1018 -1021 -1025 -1031 -1037 -1043 -1050 -1056 -2009 -2012 -2015 -2018 -2021 -2025 -20
14、31 -2037 -2043 -2050 -2056 -3009 -3012 -3015 -3018 -3021 -3025 -3031 -3037 -3043 -3050 -3056 -4009 -4012 -4015 -4018 -4021 -4025 -4031 -4037 -4043 -4050 -4056 -5009 -5012 -5015 -5018 -5021 -5025 -5031 -5037 -5043 -5050 -5056 1/ Substitute corrosion resistant steel when used in food processing machin
15、ery, or in fuel or lubrication systems, or when used at temperatures over 450F (233C) Notes: 1. Unless otherwise specified, all dimensions in inches. 2. 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. 3. R
16、ecommended design limitations and usage: (a) Intended use To provide unusually large shoulders for positioning and maintaining machine components on shafts. They are applied radially and withstand strong push-out forces resulting from heavy vibrations and shock loads, high rotational speeds or relat
17、ive rotation between the retained parts. They are of further advantage where axial assembly of a retaining ring is not possible and where fast assembly for mass production lines is essential. The use of the following formulas is based on the fact that the ring material will not fail in compression.
18、Limitation on use the following formulas are not to be used for brittle materials such as cast iron, etc. Warning Rings shall 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
19、the ring has been over expanded, (providing groove has been machined to recommended dimensions). For approximate safety RPM limits see Table IV. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS3215C 4 TABLE IV. Calculated RPM limits. Apply required
20、 safety factor. SHAFT (INCHES) .125 .188 .250 .375 .500 CARBON STEEL AND CORROSION RESISTANT STEEL RPM LIMIT 70,000 50,000 38,000 28,000 20,000 BERYLLIUM COPPER RPM LIMIT 45,000 32,000 24,000 18,000 13,000 (b) Allowable thrust load capacity of the ring. Abutting components to have sharp corners = P
21、= STX 3F Where: F = Allowable thrust load (Pounds) S = Shaft diameter (Inches) T = Ring thickness (Inches) X = Ultimate shear strength of the ring material (PSI) 1/ F = Factor of safety A safety factor, F = 3, is recommended, since the ring under load is subjected not only to shear stresses but also
22、 to bending stresses (c) Allowable load capacity of groove wall = P = GdY 3F Where: F = Allowable compression load (Pounds) G = Groove diameter (Inches) d = Groove depth (Inches) Y = Yield strength in compression of the groove material (PSI) F = Factor of safety To insure a safe working load a safet
23、y factor, F = 2, is recommended. (d) Minimum distance between outer groove wall and end of shaft = Z = 2d Where: Z = Minimum distance between outer groove and end of shaft (Inches) d = Groove depth (Inches) 1/ X = 100,000 PSI ultimate shear strength for rings .015 thick of carbon steel or corrosion
24、resistant steel. X = 120,000 PSI ultimate shear strength for rings .025 thick of carbon steel or corrosion resistant steel. X = 150,000 PSI ultimate shear strength for rings over .025 thick of carbon steel or corrosion resistant steel. X = 110,000 PSI ultimate shear strength for rings of all thickne
25、sses of beryllium copper. (e) Differential rotation = The condition under which a retaining ring may be used when adjacent parts rotate relative to it, fall into two categories: (1) Where no thrust is exerted by adjacent part, in this case, differential rotation of ring and adjacent part creates no
26、element of risk in the application of the rings because no frictional torque is exerted by the machine part on the ring. (2) Consideration must be given to the magnitude of the thrust involved. The friction moment may not exceed the bending moment, which the ring can tolerate without releasing its p
27、ressure against the bottom of the groove, formulated as follows: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MS3215C 5 fPN sTE2 or 50 P sTE2f50N Where: P = Allowable thrust load exerted by adjacent part (Pounds) f = Coefficient of friction s = Wo
28、rking stress of ring under maximum expansion T = Ring thickness (Inches) E = Listed “E” dimension of ring on page 2 N = Neutral ring diameter (Inches) = free diameter plus 1 E dimension In such cases where differential rotation occurs, the calculation should be based on the MAXIMUM possible value of
29、 the coefficient of friction (f) Impact capacity of ring or groove wall = IR= PT - For the ring (Inch Pounds) Abutting components to have sharp corners 2 IG= Pd - For the groove (Inch Pounds) 2 Where P = Allowable thrust load of ring or groove (Pounds) T = Ring thickness (Inches) IG= Impact capacity
30、 of groove wall (Inch Pounds) d = Groove depth (Inches) IR= Impact capacity of ring (Inch Pounds) (g) Load capacity with the retained part radiused or chamfered = The allowable thrust loads, when computed from the formulas on page 4, will not be affected when the (E) rings are used against parts hav
31、ing corner radii or chamfers up to listed maximum dimensions. 4. Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes. MILITARY INTEREST Custodians: Preparing activity: Army - AR DLA - IS
32、 Navy - OS Air Force - 99 (Project 5325-2011-002) Review Activity: Army - MI NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.daps.dla.mil Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
