PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

25521Tube Assembly,metal

Williams International Co., L.l.c. · NSN 4710-01-012-4953 · FSC 4710 · No Item Name Available
Verified by PartsTable
NSN 4710-01-012-4953 — this item is cataloged by the U.S. Government under National Stock Number 4710-01-012-4953. Primary manufacturer part number: 25521.
Features
  • Tube Assembly,metal — FSC 4710
  • End Connection Spec/std: MIL,MS20819,PART NO. MS20819-6J AND AN,AN818,PART NO. AN818-6J
  • Material: STEEL COMP 304 OR STEEL COMP 321 OR STEEL COMP 347 TUBING
  • Thread Series Designator: UNF SINGLE END
  • End Connection Style: SWIVEL NUT, FLARED SINGLE END
  • Material Document and Classification: AISI 304 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 321 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 347 ASSN STD SINGLE MATERIAL RESPONSE TUBING
  • Material Document and Classification: TYPE 304 ASSN STD SINGLE MATERIAL RESPONSE SINGLE END
  • Nominal Thread Size: 0.562 INCHES SINGLE END IN
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Steel Comp 304 or Steel Comp 321 or Steel Comp 347 Tubing construction
General Description

The Tube Assembly,metal, cataloged under National Stock Number 4710-01-012-4953, is classified within Federal Supply Class 4710 (No Item Name Available) of the Pipe, Tubing, Hose, and Fittings group. The primary manufacturer of record is Williams International Co., L.l.c.. Government technical data includes 15 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
NSN4710-01-012-4953
Primary Part Number25521
Item NameTube Assembly,metal
FSC / FSG4710 / 47 — No Item Name Available
ManufacturerWilliams International Co., L.l.c.
StatusACTIVE
End Connection Spec/stdMIL,MS20819,PART NO. MS20819-6J AND AN,AN818,PART NO. AN818-6J
MaterialSTEEL COMP 304 OR STEEL COMP 321 OR STEEL COMP 347 TUBING
Thread Series DesignatorUNF SINGLE END
End Connection StyleSWIVEL NUT, FLARED SINGLE END
Material Document and ClassificationAISI 304 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 321 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 347 ASSN STD SINGLE MATERIAL RESPONSE TUBING
Material Document and ClassificationTYPE 304 ASSN STD SINGLE MATERIAL RESPONSE SINGLE END
Nominal Thread Size0.562 INCHES SINGLE END IN
MaterialSTEEL CORROSION RESISTING SINGLE END
Tube Outside Diameter0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND SINGLE END
Mating End Quantity2 SINGLE END
Wall Thickness0.032 INCHES MINIMUM AND 0.038 INCHES MAXIMUM IN
Design FormPREBENT
Seat Angle in Deg37.0 SINGLE END
Thread Class3B SINGLE END
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
4210-00-035-949025521 INTERCHANGEABLE
Extinguisher,fire
Tyco Fire Products Lp
3110-00-100-0545 INTERCHANGEABLE
Cup,tapered Roller Bearing
4730-00-106-7319 INTERCHANGEABLE
Bushing,tank
5365-00-278-4990113933H INTERCHANGEABLE
Plug,machine Thread,magnetic
Navistar Intl Corp Truck Br Ohio Plant
4820-00-351-244525521 INTERCHANGEABLE
Valve,safety Relief
Moog Inc. Dba Ampac-Isp Corp
6685-00-723-55472552-1 INTERCHANGEABLE
Gage,pressure,dial Indicating
Rochester Sensors, Llc
5950-01-210-4433U-37A INTERCHANGEABLE
Transformer,power
Mpc Products Corporation Dba Woodward Mpc, Inc.
5330-01-356-5061101644 INTERCHANGEABLE
Retainer,packing
Paccar Winch Inc Dba Paccar Winch Division
5998-01-422-78973174AS7271 INTERCHANGEABLE
Holder,electrical Card
Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier
Cross-Reference Index
Part NumberManufacturer
25521 PRIMARY Williams International Co., L.l.c. (USA)
Related Parts
4210-00-035-9490INTERCHANGEABLE
EXTINGUISHER,FIRE
25521
3110-00-100-0545INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
4730-00-106-7319INTERCHANGEABLE
BUSHING,TANK
5365-00-278-4990INTERCHANGEABLE
PLUG,MACHINE THREAD,MAGNETIC
113933H
4820-00-351-2445INTERCHANGEABLE
VALVE,SAFETY RELIEF
25521
6685-00-723-5547INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
2552-1
5950-01-210-4433INTERCHANGEABLE
TRANSFORMER,POWER
U-37A
5330-01-356-5061INTERCHANGEABLE
RETAINER,PACKING
101644
5998-01-422-7897INTERCHANGEABLE
HOLDER,ELECTRICAL CARD
3174AS7271

Frequently Asked Questions

What is NSN 4710-01-012-4953?

NSN 4710-01-012-4953 is a Tube Assembly,metal, manufactured by Williams International Co., L.l.c., classified under FSC 4710 (No Item Name Available). Status: active.

What are the part numbers for NSN 4710-01-012-4953?

NSN 4710-01-012-4953 has 1 cross-referenced part number: 25521 (Williams International Co., L.l.c.).

What NSN replaces 4710-01-012-4953?

There are 9 known substitutes for 4710-01-012-4953: 4210-00-035-9490, 3110-00-100-0545, 4730-00-106-7319 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 25521?

Key specifications for 25521: End Connection Spec/std: MIL,MS20819,PART NO. MS20819-6J AND AN,AN818,PART NO. AN818-6J; Material: STEEL COMP 304 OR STEEL COMP 321 OR STEEL COMP 347 TUBING; Thread Series Designator: UNF SINGLE END; End Connection Style: SWIVEL NUT, FLARED SINGLE END. 15 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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