PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18356NPC27Seal Stem,valve

Naval Inventory Control Point Mechanicsburg · NSN 4820-01-135-8329 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-135-8329 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-135-8329. Primary manufacturer part number: 18356NPC27.
Features
  • Seal Stem,valve — FSC 4820
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
  • Criticality Code Justification: ZZZY
  • 4 verified cross-references
  • Primary manufacturer: Naval Inventory Control Point Mechanicsburg
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
General Description

The Seal Stem,valve, cataloged under National Stock Number 4820-01-135-8329, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-135-8329
Primary Part Number18356NPC27
Item NameSeal Stem,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerNaval Inventory Control Point Mechanicsburg
StatusACTIVE
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.
Criticality Code JustificationZZZY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
4820-00-115-245437740J INTERCHANGEABLE
Seat,valve
Griswold Industries Dba Cla-Val Co
3455-00-236-0787 INTERCHANGEABLE
Reamer,machine
5340-00-615-6762TAD1014 INTERCHANGEABLE
Boot,dust and Moisture Seal
Robin Industries, Inc. Dba Berlin Manufacturing Div Div Cleveland Manufacturing
5340-00-680-4557TA4C75S40 INTERCHANGEABLE
Clamp,loop
Ta Aerospace Co Div Ta Aerospace
5985-01-294-595223881 INTERCHANGEABLE
Coupler,directional
Narda Holdings, Inc. Dba Narda-Miteq Div Narda-Miteq
Cross-Reference Index
Part NumberManufacturer
18356NPC27 Naval Inventory Control Point Mechanicsburg (USA)
12796N PIECE 18 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
18356NPC27 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
37740 Leslie Controls, Inc. Dba Leslie Controls Inc (USA)
Related Parts
4820-00-115-2454INTERCHANGEABLE
SEAT,VALVE
37740J
3455-00-236-0787INTERCHANGEABLE
REAMER,MACHINE
5340-00-615-6762INTERCHANGEABLE
BOOT,DUST AND MOISTURE SEAL
TAD1014
5340-00-680-4557INTERCHANGEABLE
CLAMP,LOOP
TA4C75S40
5985-01-294-5952INTERCHANGEABLE
COUPLER,DIRECTIONAL
23881

Frequently Asked Questions

What is NSN 4820-01-135-8329?

NSN 4820-01-135-8329 is a Seal Stem,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-135-8329?

NSN 4820-01-135-8329 has 4 cross-referenced part numbers: 18356NPC27 (Naval Inventory Control Point Mechanicsburg), 12796N PIECE 18 (Leslie Controls, Inc. Dba Leslie Controls Inc), 18356NPC27 (Leslie Controls, Inc. Dba Leslie Controls Inc), 37740 (Leslie Controls, Inc. Dba Leslie Controls Inc).

What NSN replaces 4820-01-135-8329?

There are 5 known substitutes for 4820-01-135-8329: 4820-00-115-2454, 3455-00-236-0787, 5340-00-615-6762 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18356NPC27?

Key specifications for 18356NPC27: Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH NAVICP MECH; ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS.; Criticality Code Justification: ZZZY. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com