MS27642G
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 MS27642 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 of
.0003 to .0006 inches.
6. PART NUMBER: The part number shall be sequenced left to right with designations in the following sequence:
EXAMPLE OF PART NUMBER:
+.0010
MS27642 - 16 S G = Bearing ball airframe, extra light duty, 1.000 inch bore -.0005 inch bore tolerance, .0001
to .0005 inch radial internal clearance, filled 80% minimum with MIL-G-23827 lubricant,
250 F max.
Lubricant designator (see lubricant requirements) Close bore tolerance designator (see Table I)
Dash number (see Table I)
Military Specification Sheet Number
7. Removable seals are required. NOTES:
1. This specification takes precedence over any other documents referenced herein.
2. Referenced documents are the issues in effect at the date of invitation for bid.
3. The parts covered by MS20202 are cancelled. Use MS27642 for new design and replacement.
Custodians:
Army - AV Preparing activity: Air Force - 99 Navy - AS
Navy - AS
Review activities:
Army - AR, AT, CR4, MI, Air Force - 84
DLA-IS
(Project 3110-1064)
3
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