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MS16632 — external crescent retaining ring, reduced section

MS16632: external crescent retaining ring for .125 to 2.000 shafts. Ring and groove dimensions, and every part number by material and finish.

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Specification

Where to buy
ItemValue
TypeExternal crescent retaining ring
MaterialCarbon spring steel, grade 1060 thru 1095 (UNS G10600 thru G10950); corrosion-resistant steel, AMS 5520 (UNS S15700); beryllium copper, alloy 170 (UNS C17000) or 172 (UNS C17200), ASTM B194
FinishCarbon steel, by dash number: cadmium plate, zinc coat or phosphate coat; corrosion-resistant steel: cleaned, descaled and passivated (QQ-P-35)
ProcurementMIL-R-21248, Type I, Class 6
StatusCheck the current issue before design use. Notice 1 (Dec 1999) cancelled MS16632B in favour of ASME B18.27.2; Notice 2 (Feb 2003) reinstated it for acquisition.

Dimensions by size

Dimension, in.125.156.188.219.236.250.281.312.375.406.438.500.562.625.688.750.812.875.9381.0001.1251.2501.3751.5001.7502.000
D — D free dia, basic.102.131.161.187.203.211.242.270.328.359.386.441.497.553.608.665.721.777.830.887.9971.1101.2201.3311.5551.777
D tolerance+.002/-.004+.002/-.004+.002/-.004+.003/-.005+.003/-.005+.003/-.005+.003/-.005+.003/-.005+.003/-.005+.003/-.005+.003/-.005±.006±.006±.006±.006±.007±.007±.007±.007±.007±.008±.008±.008±.008±.010±.010
E — E large section height, basic.031.037.042.044.046.050.052.053.060.063.065.070.078.081.086.090.097.105.112.120.135.150.165.180.210.240
E tolerance±.003±.003±.003±.003±.004±.004±.004±.004±.004±.004±.004±.005±.005±.005±.005±.005±.005±.005±.005±.005±.007±.007±.007±.007±.007±.007
T — T thickness, basic.015.015.015.025.025.025.025.025.025.025.025.035.035.035.042.042.042.042.042.042.050.050.050.050.062.062
T tolerance±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.002±.003±.003
G — G groove dia, basic.106.135.165.193.208.220.247.276.335.364.393.450.507.563.619.676.732.789.843.9001.0131.1261.2371.3501.5761.800
G tolerance±.0015±.0015±.0015±.002±.002±.002±.002±.002±.002±.002±.002±.003±.003±.003±.003±.003±.003±.003±.003±.003±.004±.004±.004±.004±.005±.005
FIM — Groove concentricity, FIM.0015.0015.0015.002.002.002.002.002.002.002.002.004.004.004.004.004.004.004.004.004.005.005.005.005.005.005
W — W groove width, basic.020.020.020.030.030.030.030.030.030.030.030.040.040.040.047.047.047.047.047.047.056.056.056.056.068.068
W tolerance+.002/-.000+.002/-.000+.002/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.003/-.000+.004/-.000+.004/-.000+.004/-.000+.004/-.000+.004/-.000+.004/-.000
R — R max, retained part.014.018.021.021.022.023.021.024.026.027.029.030.033.033.034.036.038.040.043.046.052.057.062.069.081.091
CH — CH max, retained part.011.014.016.016.017.018.016.018.020.021.022.023.025.025.026.027.029.031.033.035.040.044.048.053.062.070

Dimensions in inches, as tabulated in the standard (letters as on its drawing). Groove and retained-part figures are recommendations (ref).

Part numbers

Every part number by shaft diameter, material and finish. The standard governs.

.1255 part numbers

Part no.Material and finish
MS16632-1012Carbon steel, cadmium plate
MS16632-2012Carbon steel, zinc coat
MS16632-3012Carbon steel, phosphate coat
MS16632-4012Corrosion-resistant steel
MS16632-5012Beryllium copper

.1565 part numbers

Part no.Material and finish
MS16632-1015Carbon steel, cadmium plate
MS16632-2015Carbon steel, zinc coat
MS16632-3015Carbon steel, phosphate coat
MS16632-4015Corrosion-resistant steel
MS16632-5015Beryllium copper

.1885 part numbers

Part no.Material and finish
MS16632-1018Carbon steel, cadmium plate
MS16632-2018Carbon steel, zinc coat
MS16632-3018Carbon steel, phosphate coat
MS16632-4018Corrosion-resistant steel
MS16632-5018Beryllium copper

.2195 part numbers

Part no.Material and finish
MS16632-1021Carbon steel, cadmium plate
MS16632-2021Carbon steel, zinc coat
MS16632-3021Carbon steel, phosphate coat
MS16632-4021Corrosion-resistant steel
MS16632-5021Beryllium copper

.2365 part numbers

Part no.Material and finish
MS16632-1023Carbon steel, cadmium plate
MS16632-2023Carbon steel, zinc coat
MS16632-3023Carbon steel, phosphate coat
MS16632-4023Corrosion-resistant steel
MS16632-5023Beryllium copper

.2505 part numbers

Part no.Material and finish
MS16632-1025Carbon steel, cadmium plate
MS16632-2025Carbon steel, zinc coat
MS16632-3025Carbon steel, phosphate coat
MS16632-4025Corrosion-resistant steel
MS16632-5025Beryllium copper

.2815 part numbers

Part no.Material and finish
MS16632-1028Carbon steel, cadmium plate
MS16632-2028Carbon steel, zinc coat
MS16632-3028Carbon steel, phosphate coat
MS16632-4028Corrosion-resistant steel
MS16632-5028Beryllium copper

.3125 part numbers

Part no.Material and finish
MS16632-1031Carbon steel, cadmium plate
MS16632-2031Carbon steel, zinc coat
MS16632-3031Carbon steel, phosphate coat
MS16632-4031Corrosion-resistant steel
MS16632-5031Beryllium copper

.3755 part numbers

Part no.Material and finish
MS16632-1037Carbon steel, cadmium plate
MS16632-2037Carbon steel, zinc coat
MS16632-3037Carbon steel, phosphate coat
MS16632-4037Corrosion-resistant steel
MS16632-5037Beryllium copper

.4065 part numbers

Part no.Material and finish
MS16632-1040Carbon steel, cadmium plate
MS16632-2040Carbon steel, zinc coat
MS16632-3040Carbon steel, phosphate coat
MS16632-4040Corrosion-resistant steel
MS16632-5040Beryllium copper

.4385 part numbers

Part no.Material and finish
MS16632-1043Carbon steel, cadmium plate
MS16632-2043Carbon steel, zinc coat
MS16632-3043Carbon steel, phosphate coat
MS16632-4043Corrosion-resistant steel
MS16632-5043Beryllium copper

.5005 part numbers

Part no.Material and finish
MS16632-1050Carbon steel, cadmium plate
MS16632-2050Carbon steel, zinc coat
MS16632-3050Carbon steel, phosphate coat
MS16632-4050Corrosion-resistant steel
MS16632-5050Beryllium copper

.5625 part numbers

Part no.Material and finish
MS16632-1056Carbon steel, cadmium plate
MS16632-2056Carbon steel, zinc coat
MS16632-3056Carbon steel, phosphate coat
MS16632-4056Corrosion-resistant steel
MS16632-5056Beryllium copper

.6255 part numbers

Part no.Material and finish
MS16632-1062Carbon steel, cadmium plate
MS16632-2062Carbon steel, zinc coat
MS16632-3062Carbon steel, phosphate coat
MS16632-4062Corrosion-resistant steel
MS16632-5062Beryllium copper

.6885 part numbers

Part no.Material and finish
MS16632-1068Carbon steel, cadmium plate
MS16632-2068Carbon steel, zinc coat
MS16632-3068Carbon steel, phosphate coat
MS16632-4068Corrosion-resistant steel
MS16632-5068Beryllium copper

.7505 part numbers

Part no.Material and finish
MS16632-1075Carbon steel, cadmium plate
MS16632-2075Carbon steel, zinc coat
MS16632-3075Carbon steel, phosphate coat
MS16632-4075Corrosion-resistant steel
MS16632-5075Beryllium copper

.8125 part numbers

Part no.Material and finish
MS16632-1081Carbon steel, cadmium plate
MS16632-2081Carbon steel, zinc coat
MS16632-3081Carbon steel, phosphate coat
MS16632-4081Corrosion-resistant steel
MS16632-5081Beryllium copper

.8755 part numbers

Part no.Material and finish
MS16632-1087Carbon steel, cadmium plate
MS16632-2087Carbon steel, zinc coat
MS16632-3087Carbon steel, phosphate coat
MS16632-4087Corrosion-resistant steel
MS16632-5087Beryllium copper

.9385 part numbers

Part no.Material and finish
MS16632-1093Carbon steel, cadmium plate
MS16632-2093Carbon steel, zinc coat
MS16632-3093Carbon steel, phosphate coat
MS16632-4093Corrosion-resistant steel
MS16632-5093Beryllium copper

1.0005 part numbers

Part no.Material and finish
MS16632-1100Carbon steel, cadmium plate
MS16632-2100Carbon steel, zinc coat
MS16632-3100Carbon steel, phosphate coat
MS16632-4100Corrosion-resistant steel
MS16632-5100Beryllium copper

1.1255 part numbers

Part no.Material and finish
MS16632-1112Carbon steel, cadmium plate
MS16632-2112Carbon steel, zinc coat
MS16632-3112Carbon steel, phosphate coat
MS16632-4112Corrosion-resistant steel
MS16632-5112Beryllium copper

1.2505 part numbers

Part no.Material and finish
MS16632-1125Carbon steel, cadmium plate
MS16632-2125Carbon steel, zinc coat
MS16632-3125Carbon steel, phosphate coat
MS16632-4125Corrosion-resistant steel
MS16632-5125Beryllium copper

1.3755 part numbers

Part no.Material and finish
MS16632-1137Carbon steel, cadmium plate
MS16632-2137Carbon steel, zinc coat
MS16632-3137Carbon steel, phosphate coat
MS16632-4137Corrosion-resistant steel
MS16632-5137Beryllium copper

1.5005 part numbers

Part no.Material and finish
MS16632-1150Carbon steel, cadmium plate
MS16632-2150Carbon steel, zinc coat
MS16632-3150Carbon steel, phosphate coat
MS16632-4150Corrosion-resistant steel
MS16632-5150Beryllium copper

1.7505 part numbers

Part no.Material and finish
MS16632-1175Carbon steel, cadmium plate
MS16632-2175Carbon steel, zinc coat
MS16632-3175Carbon steel, phosphate coat
MS16632-4175Corrosion-resistant steel
MS16632-5175Beryllium copper

2.0005 part numbers

Part no.Material and finish
MS16632-1200Carbon steel, cadmium plate
MS16632-2200Carbon steel, zinc coat
MS16632-3200Carbon steel, phosphate coat
MS16632-4200Corrosion-resistant steel
MS16632-5200Beryllium copper

Part number

What each code means

PartMeaning
FormatMS16632-<dash>
ExampleMS16632-1100 — Carbon steel, cadmium plate, for a 1.000 shaft

Table II: hardness

Shaft dia (ref), inCarbon steelCorrosion-resistant steelBeryllium copper
.125 to .438 incl.84.5 - 87.0 HR15N82.5 - 86 HR15N77 - 82 HR15N
.500 to .625 incl.66.5 - 71.5 HR30N—54 - 62 HR30N
.688 to 1.000 incl.52.5 - 58.5 HR45N48 - 56 HR45N36 - 47 HR45N
1.125 to 2.000 incl.48 - 53 HRC44 - 51 HRC34 - 43 HRC

As printed in MS16632B Table II. Corrosion-resistant steel, .500 to .625: the value is not legible on the copy of the standard.

Every MS16632 number and its replacement

26 pairs, as listed in MS16632 Rev. B. The old number stays valid on drawings and IPCs; the replacement is what to order.

Show the 26 pairs
MS16632-12→ MS16632-1012, -2012 or -3012MS16632-15→ MS16632-1015, -2015 or -3015MS16632-18→ MS16632-1018, -2018 or -3018MS16632-21→ MS16632-1021, -2021 or -3021MS16632-23→ MS16632-1023, -2023 or -3023MS16632-25→ MS16632-1025, -2025 or -3025MS16632-28→ MS16632-1028, -2028 or -3028MS16632-31→ MS16632-1031, -2031 or -3031MS16632-37→ MS16632-1037, -2037 or -3037MS16632-40→ MS16632-1040, -2040 or -3040MS16632-43→ MS16632-1043, -2043 or -3043MS16632-50→ MS16632-1050, -2050 or -3050MS16632-56→ MS16632-1056, -2056 or -3056MS16632-62→ MS16632-1062, -2062 or -3062MS16632-68→ MS16632-1068, -2068 or -3068MS16632-75→ MS16632-1075, -2075 or -3075MS16632-81→ MS16632-1081, -2081 or -3081MS16632-87→ MS16632-1087, -2087 or -3087MS16632-93→ MS16632-1093, -2093 or -3093MS16632-100→ MS16632-1100, -2100 or -3100MS16632-112→ MS16632-1112, -2112 or -3112MS16632-125→ MS16632-1125, -2125 or -3125MS16632-137→ MS16632-1137, -2137 or -3137MS16632-150→ MS16632-1150, -2150 or -3150MS16632-175→ MS16632-1175, -2175 or -3175MS16632-200→ MS16632-1200, -2200 or -3200

Notes from the standard

  • Thickness T applies to unplated rings; for corrosion-resistant steel and plated rings add .002 to the maximum tolerance (±.002 becomes +.004/-.002).
  • FIM (full indicator movement): maximum allowable deviation of concentricity between the groove and the shaft.
  • R and CH: radii or chamfers allowable on the parts retained by the ring.
  • Use corrosion-resistant steel in food processing machinery, in fuel or lubrication systems, or above 450°F.
  • Groove bottom radius, max: .005 for shafts .125 to .438 incl., .010 for .500 to 1.000 incl., .015 for 1.125 and over.
  • Inactive carbon steel numbers are replaced by the cadmium plated, zinc coated or phosphate coated carbon steel ring of the same shaft (pairs below).

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Calculators

CalculatorPart Number Equivalent Cross-Reference & DecoderType any MS16632 number and see its other names.CalculatorDistributor finderFind where to buy aircraft part numbers

Guides

GuideASNA fastenersHow to read ASNA blind bolt and rivet numbersChartFastener cross-referenceFrequent fastener crosses with their supersession status

Data sheets

Data sheetPins, rings and small hardwareThe family side by side.Data sheetMS16625Ring, Retaining, Basic (Internal)Data sheetMS16633Ring, Retaining, External, "E" (Reduced Section Type)

Books

Fasteners & HardwareBookFasteners & HardwareFastener types and codes, sizes, tools and substitutes in one reference. Coming soon.

Sources

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
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