PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

11521Adapter,straight,pipe to Tube

Mission Systems Orchard Park Inc · NSN 4730-00-403-9954 · FSC 4730 · No Item Name Available
Verified by PartsTable
NSN 4730-00-403-9954 — this item is cataloged by the U.S. Government under National Stock Number 4730-00-403-9954. Primary manufacturer part number: 11521.
Features
  • Adapter,straight,pipe to Tube — FSC 4730
  • Nominal Thread Size: 0.750 INCHES FIRST END IN
  • Nominal Thread Size: 0.375 INCHES SECOND END IN
  • Surface Treatment Document and Classification: MIL-A-8625,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
  • Connection Type: THREADED EXTERNAL TUBE FIRST END
  • Material: ALUMINUM ALLOY 2017 OVERALL
  • Nominal Outside Diameter Tube Accommodated: 0.500 INCHES FIRST END IN
  • Surface Treatment: ANODIZE INSIDE
Applications
  • Fluid conveyance
  • Hydraulic system plumbing
  • Pneumatic line routing
  • Applications requiring Aluminum Alloy 2017 Overall construction
General Description

The Adapter,straight,pipe to Tube, cataloged under National Stock Number 4730-00-403-9954, 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 Mission Systems Orchard Park Inc. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4730-00-403-9954
Primary Part Number11521
Item NameAdapter,straight,pipe to Tube
FSC / FSG4730 / 47 — No Item Name Available
ManufacturerMission Systems Orchard Park Inc
StatusACTIVE
Nominal Thread Size0.750 INCHES FIRST END IN
Nominal Thread Size0.375 INCHES SECOND END IN
Surface Treatment Document and ClassificationMIL-A-8625,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
Connection TypeTHREADED EXTERNAL TUBE FIRST END
MaterialALUMINUM ALLOY 2017 OVERALL
Nominal Outside Diameter Tube Accommodated0.500 INCHES FIRST END IN
Surface TreatmentANODIZE INSIDE
Thread Series DesignatorUNF FIRST END
Seat Angle37.0 DEGREES FIRST END
Connection StyleFLARED (TUBE) FIRST END
Nominal Overall Length2.125 INCHES IN
Connection TypeTHREADED INTERNAL PIPE SECOND END
Connection StylePLAIN (PIPE) SECOND END
Nominal Pipe Size Accommodated0.375 INCHES SECOND END IN
Material Document and ClassificationQQ-A-351 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Thread Series DesignatorANPT SECOND END
Surface TreatmentANODIZE OUTSIDE
Surface Treatment Document and ClassificationMIL-A-8625,TY 1 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
Thread Class3A FIRST END A
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3110-00-114-9496ER23 INTERCHANGEABLE
Bearing,ball,annular
Morse Industrial Corp Sealmaster Bearing Div Sub of Emerson Electric Co
2915-00-305-42171-152-1 INTERCHANGEABLE
Valve,float,aircraft Fuel Tank
Parker Hannifin Corporation Div Aerospace Group Headquarters
3655-00-377-501411521 INTERCHANGEABLE
Disk,gate Valve
Flowserve Inc
5935-00-392-7793SM-B-157243 INTERCHANGEABLE
Retainer,electrical Connector
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
2520-00-530-7544121406R92 INTERCHANGEABLE
Parts Kit,universal Joint
Dressta North America Ltd
5136-00-585-6760 INTERCHANGEABLE
Tap,thread Cutting
5950-00-647-9858506-2971-002 INTERCHANGEABLE
Transformer,radio Frequency
Rockwell Collins, Inc. Div Collins Aerospace - Mission Systems
5365-00-740-5979 INTERCHANGEABLE
Shim
6210-00-926-76801152-1 INTERCHANGEABLE
Light,indicator
Safran Electronics & Defense, Avionics Usa, Llc Dba Use CAGE Code 879b2 for Cataloging
3020-00-951-06851152-1 INTERCHANGEABLE
Gear,dial
Drs Signal Solutions, Inc.
Cross-Reference Index
Part NumberManufacturer
11521 PRIMARY Mission Systems Orchard Park Inc (USA)
11521 Ingersoll-Rand Company Dba Ingersoll-Rand (USA)
Related Parts
3110-00-114-9496INTERCHANGEABLE
BEARING,BALL,ANNULAR
ER23
2915-00-305-4217INTERCHANGEABLE
VALVE,FLOAT,AIRCRAFT FUEL TANK
1-152-1
3655-00-377-5014INTERCHANGEABLE
DISK,GATE VALVE
11521
5935-00-392-7793INTERCHANGEABLE
RETAINER,ELECTRICAL CONNECTOR
SM-B-157243
2520-00-530-7544INTERCHANGEABLE
PARTS KIT,UNIVERSAL JOINT
121406R92
5136-00-585-6760INTERCHANGEABLE
TAP,THREAD CUTTING
5950-00-647-9858INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
506-2971-002
5365-00-740-5979INTERCHANGEABLE
SHIM
6210-00-926-7680INTERCHANGEABLE
LIGHT,INDICATOR
1152-1
3020-00-951-0685INTERCHANGEABLE
GEAR,DIAL
1152-1
5330-01-235-6293INTERCHANGEABLE
PACKING MATERIAL
11521
5970-01-525-0321INTERCHANGEABLE
INSULATION SLEEVING,ELECTRICAL
115-21

Frequently Asked Questions

What is NSN 4730-00-403-9954?

NSN 4730-00-403-9954 is a Adapter,straight,pipe to Tube, manufactured by Mission Systems Orchard Park Inc, classified under FSC 4730 (No Item Name Available). Status: active.

What are the part numbers for NSN 4730-00-403-9954?

NSN 4730-00-403-9954 has 2 cross-referenced part numbers: 11521 (Mission Systems Orchard Park Inc), 11521 (Ingersoll-Rand Company Dba Ingersoll-Rand).

What NSN replaces 4730-00-403-9954?

There are 12 known substitutes for 4730-00-403-9954: 3110-00-114-9496, 2915-00-305-4217, 3655-00-377-5014 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 11521?

Key specifications for 11521: Nominal Thread Size: 0.750 INCHES FIRST END IN; Nominal Thread Size: 0.375 INCHES SECOND END IN; Surface Treatment Document and Classification: MIL-A-8625,TYPE 1 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE; Connection Type: THREADED EXTERNAL TUBE FIRST END. 19 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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