PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12181Spacer,sleeve

Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney · NSN 5365-00-637-2129 · FSC 5365 · No Item Name Available
Verified by PartsTable
NSN 5365-00-637-2129 — this item is cataloged by the U.S. Government under National Stock Number 5365-00-637-2129. Primary manufacturer part number: 12181.
Features
  • Spacer,sleeve — FSC 5365
  • Surface Treatment: CADMIUM OVERALL
  • Style Designator: SOLID, PLAIN, NO OUTSIDE FLANGES
  • Material: STEEL OVERALL
  • Corner Shape: SQUARE ALL CORNERS
  • Body Outside Diameter: 0.4370 INCHES MINIMUM AND 0.4380 INCHES MAXIMUM IN
  • Body Inside Diameter: 0.2030 INCHES MINIMUM AND 0.2040 INCHES MAXIMUM IN
  • 1 verified cross-reference
Applications
  • Applications requiring Steel Overall construction
General Description

The Spacer,sleeve, cataloged under National Stock Number 5365-00-637-2129, is classified within Federal Supply Class 5365 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5365-00-637-2129
Primary Part Number12181
Item NameSpacer,sleeve
FSC / FSG5365 / 53 — No Item Name Available
ManufacturerRtx Corporation Dba Pratt & Whitney Div Pratt &whitney
StatusACTIVE
Surface TreatmentCADMIUM OVERALL
Style DesignatorSOLID, PLAIN, NO OUTSIDE FLANGES
MaterialSTEEL OVERALL
Corner ShapeSQUARE ALL CORNERS
Body Outside Diameter0.4370 INCHES MINIMUM AND 0.4380 INCHES MAXIMUM IN
Body Inside Diameter0.2030 INCHES MINIMUM AND 0.2040 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5930-00-103-11621218-1 INTERCHANGEABLE
Switch,pressure
Hydra-Electric Company Dba Hydra-Electric Co
5133-00-189-9321 INTERCHANGEABLE
Drill,twist
5310-00-400-851012-18-1 INTERCHANGEABLE
Washer,flat
Porta Drill Inc
5985-01-054-3523121-8-1 INTERCHANGEABLE
Antenna
Allard Nazarian Group, Inc. Dba Granite State Manufacturing
6220-01-246-146122396 INTERCHANGEABLE
Light,warning
Tymco, Inc
3020-01-252-2693S12649 ITEM 6 INTERCHANGEABLE
Gear,spur
B.w. Elliott Manufacturing Co., Llc
2530-01-265-367917-760 INTERCHANGEABLE
Camshaft,actuating,brake Shoe
Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems
3020-01-424-979912181 INTERCHANGEABLE
Gear,internal
Curtiss-Wright Flow Control Corporation Dba Curtiss-Wright Flow Control Co Div Curtiss-Wright / Nu-Torque
5950-01-445-0078TLW-040 IT 10 INTERCHANGEABLE
Coil,electrical
Edgewater Machine & Fabricators
Cross-Reference Index
Part NumberManufacturer
12181 PRIMARY Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
Related Parts
5930-00-103-1162INTERCHANGEABLE
SWITCH,PRESSURE
1218-1
5133-00-189-9321INTERCHANGEABLE
DRILL,TWIST
5310-00-400-8510INTERCHANGEABLE
WASHER,FLAT
12-18-1
5985-01-054-3523INTERCHANGEABLE
ANTENNA
121-8-1
6220-01-246-1461INTERCHANGEABLE
LIGHT,WARNING
22396
3020-01-252-2693INTERCHANGEABLE
GEAR,SPUR
S12649 ITEM 6
2530-01-265-3679INTERCHANGEABLE
CAMSHAFT,ACTUATING,BRAKE SHOE
17-760
3020-01-424-9799INTERCHANGEABLE
GEAR,INTERNAL
12181
5950-01-445-0078INTERCHANGEABLE
COIL,ELECTRICAL
TLW-040 IT 10

Frequently Asked Questions

What is NSN 5365-00-637-2129?

NSN 5365-00-637-2129 is a Spacer,sleeve, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5365 (No Item Name Available). Status: active.

What are the part numbers for NSN 5365-00-637-2129?

NSN 5365-00-637-2129 has 1 cross-referenced part number: 12181 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).

What NSN replaces 5365-00-637-2129?

There are 9 known substitutes for 5365-00-637-2129: 5930-00-103-1162, 5133-00-189-9321, 5310-00-400-8510 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12181?

Key specifications for 12181: Overall Length: 0.1250 INCHES MINIMUM AND 0.1260 INCHES MAXIMUM IN; Surface Treatment: CADMIUM OVERALL; Style Designator: SOLID, PLAIN, NO OUTSIDE FLANGES; Material: STEEL OVERALL. 7 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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