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National Stock Number:
5365-00-998-8447
Federal Supply Class:
5365
National Item Identification Number:
009988447
Description:
SPACER,RING
Detail:
A circular-shaped item designed to maintain predetermined distance between assembled parts and/or for distributing pressure or preventing endwise movement between member parts. It has a solid cross-section and two flat parallel bearing surfaces. The distance between the bearing surfaces perpendicular to the axis of the centrally located hole shall not exceed 25 percent of the outside diameter. The diameter of the centrally located hole must exceed 75 percent of the outside diameter. Excludes laminated items. For items manufactured from impregnated graphite or lubricated nonmetallic materials, excluding felt or plastics, see GASKET. For items manufactured from lubricated plastics, see BEARING, WASHER, THRUST. For items manufactured from lubricated felt, see FELT, MECHANICAL, PREFORMED. Excludes DISK, VALVE; INSULATOR WASHER; and SHIM. See also SPACER, PLATE and SPACER, SLEEVE.
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Manufacturer Information:
| 65356-04012-103 | 78286 | SIKORSKY AIRCRAFT CORPORATION |
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Techincal Specification:
| HARDNESS RATING | 26.0 ROCKWELL C MINIMUM AND 33.0 ROCKWELL C MAXIMUM | | INSIDE DIAMETER | 1.970 INCHES NOMINAL | | OUTSIDE DIAMETER | 2.583 INCHES MINIMUM AND 2.588 INCHES MAXIMUM | | OVERALL THICKNESS | 0.059 INCHES MINIMUM AND 0.061 INCHES MAXIMUM | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-S-18729,COND N MIL SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | STEEL COMP 4130 | | SURFACE FINISH | 90.0 MICROINCHES BORE | | SURFACE FINISH | 90.0 MICROINCHES LARGEST OUTSIDE DIAMETER | | SURFACE FINISH | 90.0 MICROINCHES LEFT SIDE | | SURFACE FINISH | 90.0 MICROINCHES RIGHT SIDE | | SURFACE TREATMENT | OXIDE |
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