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D-1903 ✓ 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 COVER,FLUID FILTER is a the manufacturer industrial component. Key specifications include material: STEEL, body_length: 14.375 INCHES NOMINAL IN, mounting_type: INLET CONNECTION AND OUTLET CONNECTION TOP SIDE, thread_series: UNIFIED NATIONAL COARSE (UNC), style_designator: Y STRAINER W/BOLTED COVER, operating_pressure: 600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-377-1779, 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
D-1903
NSN: 4730-01-377-1779
FSC: 4730
CAGE: 82328 — DRESSER RAND CO TERRY CORP STEAM TURBINE MOTOR AND GENERATOR CO A JOINT VENTURE (USA)
SPECIFICATIONS
materialSTEEL
body_length14.375 INCHES NOMINAL IN
mounting_typeINLET CONNECTION AND OUTLET CONNECTION TOP SIDE
thread_seriesUNIFIED NATIONAL COARSE (UNC)
style_designatorY STRAINER W/BOLTED COVER
operating_pressure600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
nominal_thread_size0.625 INCHES IN
filtering_media_designWOVEN SINGLE FILTERING MEDIA RESPONSE
thread_quantity_per_inch11
cross-sectional_shape_styleFLAT
nondefinitive_spec/std_data1 TYPE
first_intake_connection_typeRAISED FACE FLANGE SIDE
NSN4730-01-377-1779
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: D-1903 · 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
•
MATERIAL: STEEL COMP 304 FILTERING MEDIUM
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
•
FIRST INTAKE CONNECTION TYPE: RAISED FACE FLANGE SIDE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE FILTERING MEDIUM
•
FIRST DISCHARGE CONNECTION RELATIONSHIP TO INTAKE CONNECTION: IDENTICAL TO FIRST INTAKE CONNECTION
•
DISTANCE FROM BOTTOM OF BODY TO CENTER OF INLET: 8.250 INCHES NOMINAL IN
•
FIRST INTAKE FLANGE RAISED FACE DIAMETER: 5.000 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 304 FILTERING MEDIUM
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
FIRST INTAKE CONNECTION TYPERAISED FACE FLANGE SIDE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766 FED SPEC SINGLE MATERIAL RESPONSE FILTERING MEDIUM
FIRST DISCHARGE CONNECTION RELATIONSHIP TO INTAKE CONNECTIONIDENTICAL TO FIRST INTAKE CONNECTION
DISTANCE FROM BOTTOM OF BODY TO CENTER OF INLET8.250 INCHES NOMINAL IN
FIRST INTAKE FLANGE RAISED FACE DIAMETER5.000 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONZZZY
OPERATING PRESSURE600.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
FIRST INTAKE FLANGE FACE STYLERAISED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
D-1903Interchangeable
interchangeable cross-reference
interchangeable
326242Interchangeable
interchangeable cross-reference
interchangeable
326242L1Interchangeable
interchangeable cross-reference
interchangeable
855253L1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222Interchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222L1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D-1903?
D-1903 is a COVER,FLUID FILTER.
What parts can replace D-1903?
There are 11 known substitutes for D-1903: D-1903, 326242, 326242L1 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for D-1903?
D-1903 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-377-1779. 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