PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21251Adapter,straight,tube to Boss

Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems · NSN 4730-01-231-8621 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-01-231-8621 — this item is cataloged by the U.S. Government under National Stock Number 4730-01-231-8621. Primary manufacturer part number: 21251.
Features
  • Adapter,straight,tube to Boss — FSC 4730
  • Connection Type: THREADED EXTERNAL BOSS SECOND END
  • Connection Style: PLAIN (TUBE) FIRST END
  • Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
  • Connection Type: THREADED INTERNAL TUBE FIRST END
  • 3 verified cross-references
  • Primary manufacturer: Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
General Description

The Adapter,straight,tube to Boss, cataloged under National Stock Number 4730-01-231-8621, is classified within Federal Supply Class 4730 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, 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
NSN4730-01-231-8621
Primary Part Number21251
Item NameAdapter,straight,tube to Boss
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerStanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
StatusACTIVE
Connection TypeTHREADED EXTERNAL BOSS SECOND END
Connection StylePLAIN (TUBE) FIRST END
Connection StyleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
Connection TypeTHREADED INTERNAL TUBE FIRST END
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
5110-00-255-6557 INTERCHANGEABLE
Reamer,hand
5985-00-399-7135ESD3362-4 INTERCHANGEABLE
Mast Section
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5310-00-685-161821251 INTERCHANGEABLE
Washer,finishing
Mason Electric Co. Dba Mason Controls
1660-00-881-030621251 INTERCHANGEABLE
Converter,liquid Oxygen
Ingersoll-Rand Company Dba Ingersoll-Rand
4520-01-020-3263 INTERCHANGEABLE
Heating Element,electrical,nonim
5305-01-158-676521251 INTERCHANGEABLE
Setscrew
Erie Strayer Co
2910-01-168-8088J8123050 INTERCHANGEABLE
Float,carburetor
Chrysler Corp Engine and Components Sales Diversified Products Div
5305-01-298-062921251 INTERCHANGEABLE
Screw,cap,hexagon Head
Industrial Technologies and Services Llc
6105-01-300-647221251-2 INTERCHANGEABLE
Motor,alternating Current
Silver King Refrigeration Inc.
Cross-Reference Index
Part NumberManufacturer
21251 PRIMARY Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems (USA)
P92234 Jlg Industries, Inc. (USA)
P92234 Lull Lift Corp Dba Omniquip Parts Worldwide (USA)
Related Parts
5110-00-255-6557INTERCHANGEABLE
REAMER,HAND
5985-00-399-7135INTERCHANGEABLE
MAST SECTION
ESD3362-4
5310-00-685-1618INTERCHANGEABLE
WASHER,FINISHING
21251
1660-00-881-0306INTERCHANGEABLE
CONVERTER,LIQUID OXYGEN
21251
4520-01-020-3263INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
5305-01-158-6765INTERCHANGEABLE
SETSCREW
21251
2910-01-168-8088INTERCHANGEABLE
FLOAT,CARBURETOR
J8123050
5305-01-298-0629INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
21251
6105-01-300-6472INTERCHANGEABLE
MOTOR,ALTERNATING CURRENT
21251-2

Frequently Asked Questions

What is NSN 4730-01-231-8621?

NSN 4730-01-231-8621 is a Adapter,straight,tube to Boss, manufactured by Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-01-231-8621?

NSN 4730-01-231-8621 has 3 cross-referenced part numbers: 21251 (Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems), P92234 (Jlg Industries, Inc.), P92234 (Lull Lift Corp Dba Omniquip Parts Worldwide).

What NSN replaces 4730-01-231-8621?

There are 9 known substitutes for 4730-01-231-8621: 5110-00-255-6557, 5985-00-399-7135, 5310-00-685-1618 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21251?

Key specifications for 21251: Connection Type: THREADED EXTERNAL BOSS SECOND END; Connection Style: PLAIN (TUBE) FIRST END; Connection Style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END; Connection Type: THREADED INTERNAL TUBE FIRST END. 4 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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