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691780 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 0.160 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN, material: STEEL COMP 410, design_type: TUBULAR, thread_class: 3A LOCATION NOT OTHERWISE SPECIFIED A, thread_length: 0.150 INCHES MAXIMUM SECOND PROVISION IN, thread_series: UNF LOCATION NOT OTHERWISE SPECIFIED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-165-4997, 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
691780
NSN: 4730-00-165-4997
FSC: 4730
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
length0.160 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
materialSTEEL COMP 410
design_typeTUBULAR
thread_class3A LOCATION NOT OTHERWISE SPECIFIED A
thread_length0.150 INCHES MAXIMUM SECOND PROVISION IN
thread_seriesUNF LOCATION NOT OTHERWISE SPECIFIED
orifice_diameter0.054 INCHES MAXIMUM IN
outside_diameter0.216 INCHES NOMINAL IN
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
thread_provisionTHREADED LOCATION NOT OTHERWISE SPECIFIED
surface_treatmentPASSIVATE
thread_size_designator0.216-28 LOCATION NOT OTHERWISE SPECIFIED
NSN4730-00-165-4997
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 691780 · 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
•
SURFACE TREATMENT: PASSIVATE
•
MATERIAL: STEEL COMP 410
•
OUTSIDE DIAMETER: 0.216 INCHES NOMINAL IN
•
THREAD LENGTH: 0.150 INCHES MAXIMUM SECOND PROVISION IN
•
THREAD PROVISION: THREADED LOCATION NOT OTHERWISE SPECIFIED
•
ORIFICE DIAMETER: 0.054 INCHES MAXIMUM IN
•
DESIGN TYPE: TUBULAR
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTPASSIVATE
MATERIALSTEEL COMP 410
OUTSIDE DIAMETER0.216 INCHES NOMINAL IN
THREAD LENGTH0.150 INCHES MAXIMUM SECOND PROVISION IN
THREAD PROVISIONTHREADED LOCATION NOT OTHERWISE SPECIFIED
ORIFICE DIAMETER0.054 INCHES MAXIMUM IN
DESIGN TYPETUBULAR
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
LENGTH0.160 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
THREAD SIZE DESIGNATOR0.216-28 LOCATION NOT OTHERWISE SPECIFIED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
691780Interchangeable
interchangeable cross-reference
interchangeable
231856Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 691780?
691780 is a RESTRICTOR,FLUID FLOW.
What parts can replace 691780?
There are 2 known substitutes for 691780: 691780, 231856. Substitute compatibility should be verified for your specific system.
What is the NSN for 691780?
691780 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-165-4997. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026