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Technical Data Sheet
PartsTable / COMPONENT / AT-1 1/4
AT-1 1/4 ✓ 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 AT-1 1/4 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-279-0337, 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
AT-1 1/4
NSN: 4730-00-279-0337
FSC: 4730
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
Part NumberAT-1 1/4
NSN4730-00-279-0337
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AT-1 1/4 · 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
•
FIRST INTAKE THREAD SERIES DESIGNATOR: NPT
•
OPERATING PRESSURE: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
STYLE DESIGNATOR: Y STRAINER W/THREADED COVER
•
MEDIA FOR WHICH DESIGNED: WATER
•
FIRST INTAKE NOMINAL THREAD SIZE: 1.250 INCHES IN
•
FIRST INTAKE CONNECTION TYPE: THREADED INTERNAL PIPE LINE
•
FIRST DISCHARGE CONNECTION RELATIONSHIP TO INTAKE CONNECTION: IDENTICAL TO FIRST INTAKE CONNECTION
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND Y STYLE AND 250 CLASS
TECHNICAL CHARACTERISTICS (FLIS)
FIRST INTAKE THREAD SERIES DESIGNATORNPT
OPERATING PRESSURE400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
STYLE DESIGNATORY STRAINER W/THREADED COVER
MEDIA FOR WHICH DESIGNEDWATER
FIRST INTAKE NOMINAL THREAD SIZE1.250 INCHES IN
FIRST INTAKE CONNECTION TYPETHREADED INTERNAL PIPE LINE
FIRST DISCHARGE CONNECTION RELATIONSHIP TO INTAKE CONNECTIONIDENTICAL TO FIRST INTAKE CONNECTION
NONDEFINITIVE SPEC/STD DATA1 TYPE AND Y STYLE AND 250 CLASS
MOUNTING TYPEINLET CONNECTION AND OUTLET CONNECTION LINE
WIRE DIAMETER0.014 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
MIL-S-16293GInterchangeable
interchangeable cross-reference
interchangeable
STRAINER1INCASTIR0NSCREWEDENDSInterchangeable
interchangeable cross-reference
interchangeable
WW-S-2739Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-16293Interchangeable
interchangeable cross-reference
interchangeable
WW-S-2739C10Interchangeable
interchangeable cross-reference
interchangeable
AT1-2-1-32Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AT-1 1/4?
AT-1 1/4 is a AT-1 1/4.
What parts can replace AT-1 1/4?
There are 21 known substitutes for AT-1 1/4: MIL-S-16293G, STRAINER1INCASTIR0NSCREWEDENDS, WW-S-2739 and 18 more. Substitute compatibility should be verified for your specific system.
Is AT-1 1/4 still available?
AT-1 1/4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026