MS27645E
REQUIREMENTS:
1. MATERIAL: Rings: 52100 steel per AMS6440, or E52100 steel per FED-STD-66.
Balls: 52100 steel per AMS6440 or 51100 steel per AMS6449, or E51100 or E52100 steel per
FED-STD-66.
Seals: Polytetrafluoroethylene per AMS3652 or Polytetrafluoroethylene sheet. Glass fabric reinforced
Per AMS3666.
Seal retainers: Any corrosion resistant steel.
2. LUBRICANT: MIL-G-81322 or MIL-G-23827, all bearings shall be packed with grease conforming to
MIL-G-81322 unless otherwise specified. If MIL-G-23827 is required, add the letter "G" after the
MS27645 dash number. MIL-G-23827 shall not be used for operation where temperatures exceed
250 F.
3. HARDNESS: Heat treat rings and balls to rockwell "C" 60 to 66 and stabilize for operation at 250 F.
4. SURFACE ROUGHNESS: Raceways and balls shall be 8 microinches Ra per ANSI/ASME B46.1.
5. PLATING: All external surfaces except bore, seals and seal retainers shall be zinc nickel in accordance with AMS
2417, Type 2, or cadmium plated in accordance with QQ-P-416, Type I, Class 2, with a thickness range of .0003 to .0006 inches.
6. RADIAL INTERNAL CLEARANCE: Without designator "R" part number indicates .0000 to .0010 with designator "R" the part number indicates .0001 to .0005.
7. RADIAL and LATERAL ECCENTRICITY: Inner ring, .0010 max, outer ring, .0016 max.
8. PART NUMBER: The part number shall be sequenced left to right with designations in the following sequence: EXAMPLE OF PART NUMBER:
MS27645 - 4 R G |
= |
Bearing ball airframe, antifriction, self-aligning, light and heavy duty, .2500 inch Bore, .0001 to .0005 radial internal clearance designator, filled 80% minimum with |
MIL-G-23827 lubricant, 250 F max. |
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Lubricant designator (see lubricant requirements) |
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Radial Internal Clearance Designator (see Radial Internal Clearance Requirements) |
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Dash number (see Table I) |
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Military Specification Sheet Number |
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NOTES:
1. Unless otherwise specified, all dimensions are in inches.
2. This specification takes precedence over any other documents referenced herein.
3. Referenced documents are the issues in effect at the date of invitation for bid.
4. The parts covered by MS27261 are cancelled. Use MS27645 for new design and replacement.
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