PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12756Seal

Sundstrand Corp Sundstrand Hydraulics Div · NSN 5330-00-391-3939 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-391-3939 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-391-3939. Primary manufacturer part number: 12756.
Features
  • Seal — FSC 5330
  • General Characteristics Item Description: MATERIAL STEEL O/A; GROOVE AROUND OUTSIDE DIA; ONE END RECESSED,OTHER END WITH GROUND AND POLISHED RAISED FACE SURFACE; 1.057 IN. OD; 0.467 IN. ID; 0.264 IN. O/A LENGTH; 0.732 IN. RECESS DIA; 0.022 IN. RECESS DEPTH IN
  • 9 verified cross-references
  • Primary manufacturer: Sundstrand Corp Sundstrand Hydraulics Div
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The Seal, cataloged under National Stock Number 5330-00-391-3939, is classified within Federal Supply Class 5330 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Sundstrand Corp Sundstrand Hydraulics Div. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 9 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5330-00-391-3939
Primary Part Number12756
Item NameSeal
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerSundstrand Corp Sundstrand Hydraulics Div
StatusCANCELLED
General Characteristics Item DescriptionMATERIAL STEEL O/A; GROOVE AROUND OUTSIDE DIA; ONE END RECESSED,OTHER END WITH GROUND AND POLISHED RAISED FACE SURFACE; 1.057 IN. OD; 0.467 IN. ID; 0.264 IN. O/A LENGTH; 0.732 IN. RECESS DIA; 0.022 IN. RECESS DEPTH IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
9540-00-008-6024 INTERCHANGEABLE
Beam,structural
4320-00-018-2463906760 INTERCHANGEABLE
Coupling Half,pump
Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer
9540-00-227-8939 INTERCHANGEABLE
Beam,structural
5935-00-351-3801674816 INTERCHANGEABLE
Connector,receptacle,electrical
Lockheed Martin Corporation Div Rms - Mitchel Field
6615-00-373-93981275-6 INTERCHANGEABLE
Pulley Assy,servo D
Naval Air Warfare Center Aircraft Division Joint Base Jbmdl
5342-00-503-5954 INTERCHANGEABLE
Latch
5331-00-663-5254032214 INTERCHANGEABLE
O-Ring
Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems
5340-00-897-249512756 INTERCHANGEABLE
Plunger,detent
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
5365-01-235-1950115442 INTERCHANGEABLE
Shim Set
Lake Shore Systems, Inc.
1005-01-632-296512756 INTERCHANGEABLE
Rod Assembly,operating,gun
Barrett Firearms Manufacturing, Inc. Dba Barrett Firearms Manufacturing Inc
Cross-Reference Index
Part NumberManufacturer
12756 Sundstrand Corp Sundstrand Hydraulics Div (USA)
127562 Drs Environmental Systems Inc (USA)
127562 Suntec Industries Inc Del Dba Suntec (USA)
129792 Suntec Industries Inc Del Dba Suntec (USA)
127562 Hdt Expeditionary Systems Inc (USA)
115442 Engineered Air Systems, Inc. Dba Drs Sustainment Systems (USA)
115442 Sundstrand Corp Sundstrand Hydraulics Div (USA)
127562 Engineered Air Systems, Inc. Dba Drs Sustainment Systems (USA)
127562 Suntec Industries Inc (USA)
Related Parts
9540-00-008-6024INTERCHANGEABLE
BEAM,STRUCTURAL
4320-00-018-2463INTERCHANGEABLE
COUPLING HALF,PUMP
906760
9540-00-227-8939INTERCHANGEABLE
BEAM,STRUCTURAL
5935-00-351-3801INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
674816
6615-00-373-9398INTERCHANGEABLE
PULLEY ASSY,SERVO D
1275-6
5342-00-503-5954INTERCHANGEABLE
LATCH
5331-00-663-5254INTERCHANGEABLE
O-RING
032214
5340-00-897-2495INTERCHANGEABLE
PLUNGER,DETENT
12756
5365-01-235-1950INTERCHANGEABLE
SHIM SET
115442
1005-01-632-2965INTERCHANGEABLE
ROD ASSEMBLY,OPERATING,GUN
12756
5340-01-633-4625INTERCHANGEABLE
BRACKET,MOUNTING
12756

Frequently Asked Questions

What is NSN 5330-00-391-3939?

NSN 5330-00-391-3939 is a Seal, manufactured by Sundstrand Corp Sundstrand Hydraulics Div, classified under FSC 5330 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5330-00-391-3939?

NSN 5330-00-391-3939 has 9 cross-referenced part numbers: 12756 (Sundstrand Corp Sundstrand Hydraulics Div), 127562 (Drs Environmental Systems Inc), 127562 (Suntec Industries Inc Del Dba Suntec), 129792 (Suntec Industries Inc Del Dba Suntec), 127562 (Hdt Expeditionary Systems Inc) and 4 more.

What NSN replaces 5330-00-391-3939?

There are 11 known substitutes for 5330-00-391-3939: 9540-00-008-6024, 4320-00-018-2463, 9540-00-227-8939 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12756?

Key specifications for 12756: General Characteristics Item Description: MATERIAL STEEL O/A; GROOVE AROUND OUTSIDE DIA; ONE END RECESSED,OTHER END WITH GROUND AND POLISHED RAISED FACE SURFACE; 1.057 IN. OD; 0.467 IN. ID; 0.264 IN. O/A LENGTH; 0.732 IN. RECESS DIA; 0.022 IN. RECESS DEPTH IN; End Item Identification: GRUMMAN AEROSPACE A10 AIRCRAFT. 2 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5330-00-391-3939 still in active supply?

NSN 5330-00-391-3939 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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