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HF-251-4PL-S — COUPLING HALF,QUICK DISCONNECT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

HF-251-4PL-S: COUPLING HALF,QUICK DISCONNECT.

The COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING BALL BEARING, leg_length: 2.64 INCHES NOMINAL IN, nominal_width: 0.99 INCHES IN, nominal_length: 2.64 INCHES IN, connection_type: AIR CHUCK QUICK DISCONNECT FIRST QUICK DISCONNECT END, connection_style: BARBED OR SERRATED END SECOND QUICK DISCONNECT END. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-656-0507, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
HF-251-4PL-S
NSN: 4730-01-656-0507
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 18925 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV PNEUMATIC DIVISION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING BALL BEARING
leg_length2.64 INCHES NOMINAL IN
nominal_width0.99 INCHES IN
nominal_length2.64 INCHES IN
connection_typeAIR CHUCK QUICK DISCONNECT FIRST QUICK DISCONNECT END
connection_styleBARBED OR SERRATED END SECOND QUICK DISCONNECT END
special_featuresVALVED COUPLER WITH BRASS CONSTRUCTION; CORROSION RESISTANT VALVE; 5 STAINLESS STEEL LOCKING BALLS AND A STAINLESS VALVE SPRING; HEAVY DUTY STEEL COUPLER; WEIGHT 0.26 LBS LBS
style_designatorFEMALE COUPLING HALF
basic_shape_styleROUND ALL ENDS
operating_pressure300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
media_for_which_designedAIR SINGLE RESPONSE
nominal_width_across_flats0.81 INCHES IN
NSN4730-01-656-0507
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: HF-251-4PL-S · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NOMINAL WIDTH ACROSS FLATS: 0.81 INCHES IN
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.25 INCHES ALL ENDS IN
•
CONNECTION STYLE: BARBED OR SERRATED END SECOND QUICK DISCONNECT END
•
NOMINAL LENGTH: 2.64 INCHES IN
•
CONNECTION TYPE: AIR CHUCK QUICK DISCONNECT FIRST QUICK DISCONNECT END
•
STYLE DESIGNATOR: FEMALE COUPLING HALF
•
OPERATING PRESSURE: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
LEG LENGTH: 2.64 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
NOMINAL WIDTH ACROSS FLATS0.81 INCHES IN
NOMINAL PIPE SIZE ACCOMMODATED0.25 INCHES ALL ENDS IN
CONNECTION STYLEBARBED OR SERRATED END SECOND QUICK DISCONNECT END
NOMINAL LENGTH2.64 INCHES IN
CONNECTION TYPEAIR CHUCK QUICK DISCONNECT FIRST QUICK DISCONNECT END
STYLE DESIGNATORFEMALE COUPLING HALF
OPERATING PRESSURE300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
LEG LENGTH2.64 INCHES NOMINAL IN
BASIC SHAPE STYLEROUND ALL ENDS
SPECIAL FEATURESVALVED COUPLER WITH BRASS CONSTRUCTION; CORROSION RESISTANT VALVE; 5 STAINLESS STEEL LOCKING BALLS AND A STAINLESS VALVE SPRING; HEAVY DUTY STEEL COUPLER; WEIGHT 0.26 LBS LBS
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is HF-251-4PL-S?
HF-251-4PL-S is a COUPLING HALF,QUICK DISCONNECT.
What is the NSN for HF-251-4PL-S?
HF-251-4PL-S is cataloged in the U.S. Government catalog under NSN 4730-01-656-0507. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.