PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12-143Leak Test Compound

Swagelok Co · NSN 6850-00-186-2963 · FSC 6850 · No Item Name Available
Verified by PartsTable
NSN 6850-00-186-2963 — this item is cataloged by the U.S. Government under National Stock Number 6850-00-186-2963. Primary manufacturer part number: 12-143.
Features
  • Leak Test Compound — FSC 6850
  • Quantity Within Each Unit Package: 8.0 OUNCES OZ
  • Nondefinitive Spec/std Data: I TYPE
  • Physical Form: LIQUID
  • Nondefinitive Spec/std Data: I TYPE
  • Quantity Within Each Unit Package: 8.0 OUNCES OZ
  • 6 verified cross-references
  • Primary manufacturer: Swagelok Co
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Leak Test Compound, cataloged under National Stock Number 6850-00-186-2963, is classified within Federal Supply Class 6850 (No Item Name Available) of the Chemicals and Chemical Products group. The primary manufacturer of record is Swagelok Co. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6850-00-186-2963
Primary Part Number12-143
Item NameLeak Test Compound
FSC / FSG6850 / 68 — No Item Name Available
ManufacturerSwagelok Co
StatusCANCELLED
Quantity Within Each Unit Package8.0 OUNCES OZ
Nondefinitive Spec/std DataI TYPE
Physical FormLIQUID
Nondefinitive Spec/std DataI TYPE
Quantity Within Each Unit Package8.0 OUNCES OZ
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6850-00-051-5052 INTERCHANGEABLE
Leak Test Compound
5950-00-071-2143 INTERCHANGEABLE
Coil,radio Frequency
6720-00-112-87751214-3 INTERCHANGEABLE
Arm,counterweight
Bae Systems Information and Electronic Systems Integration Inc.
6850-00-185-0423 INTERCHANGEABLE
Leak Test Compound
5310-00-297-88333153766PC126 INTERCHANGEABLE
Nut,plain,hexagon
Naval Ship Systems Command
5330-00-435-9046 INTERCHANGEABLE
Gasket
3530-00-449-4021 INTERCHANGEABLE
Presser Foot,sewing Machine
4820-00-538-6884RD-5-3 INTERCHANGEABLE
Valve,regulating,fluid Pressure
Mid-State Sales, Inc. Div Defense Products Group
6850-00-621-1819 INTERCHANGEABLE
Leak Test Compound
6850-00-621-1820 INTERCHANGEABLE
Leak Test Compound
Cross-Reference Index
Part NumberManufacturer
12-143 Swagelok Co (USA)
607109-1 Airborne Systems North America of Nj Inc. Dba Airborne Systems of No (USA)
MIL-PRF-25567 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
6850PL1126697 Jednolity Indeks Materialowy - Uniform Material Index (POL)
MIL-L-25567 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
12-143 Nupro Co (USA)
Related Parts
6850-00-051-5052INTERCHANGEABLE
LEAK TEST COMPOUND
5950-00-071-2143INTERCHANGEABLE
COIL,RADIO FREQUENCY
6720-00-112-8775INTERCHANGEABLE
ARM,COUNTERWEIGHT
1214-3
6850-00-185-0423INTERCHANGEABLE
LEAK TEST COMPOUND
5310-00-297-8833INTERCHANGEABLE
NUT,PLAIN,HEXAGON
3153766PC126
5330-00-435-9046INTERCHANGEABLE
GASKET
3530-00-449-4021INTERCHANGEABLE
PRESSER FOOT,SEWING MACHINE
4820-00-538-6884INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
RD-5-3
6850-00-621-1819INTERCHANGEABLE
LEAK TEST COMPOUND
6850-00-621-1820INTERCHANGEABLE
LEAK TEST COMPOUND
6850-00-990-1581INTERCHANGEABLE
LEAK TEST COMPOUND
6850-01-309-6441INTERCHANGEABLE
LEAK TEST COMPOUND

Frequently Asked Questions

What is NSN 6850-00-186-2963?

NSN 6850-00-186-2963 is a Leak Test Compound, manufactured by Swagelok Co, classified under FSC 6850 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6850-00-186-2963?

NSN 6850-00-186-2963 has 6 cross-referenced part numbers: 12-143 (Swagelok Co), 607109-1 (Airborne Systems North America of Nj Inc. Dba Airborne Systems of No), MIL-PRF-25567 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 6850PL1126697 (Jednolity Indeks Materialowy - Uniform Material Index), MIL-L-25567 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M) and 1 more.

What NSN replaces 6850-00-186-2963?

There are 12 known substitutes for 6850-00-186-2963: 6850-00-051-5052, 5950-00-071-2143, 6720-00-112-8775 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12-143?

Key specifications for 12-143: Quantity Within Each Unit Package: 8.0 OUNCES OZ; Nondefinitive Spec/std Data: I TYPE; Physical Form: LIQUID; Nondefinitive Spec/std Data: I TYPE. 5 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6850-00-186-2963 still in active supply?

NSN 6850-00-186-2963 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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