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PartsTable / COMPONENT / A-33891-A
A-33891-A ✓ 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 CUP,GREASE is a the manufacturer industrial component. Key specifications include height: 2.040 INCHES NOMINAL IN, material: STEEL OVERALL, shank_length: 0.438 INCHES NOMINAL IN, special_features: FURNISHED WITH 0.250 IN. PIPE COUPLING IN, style_designator: STRAIGHT, CAP FEED, surface_treatment: DICHROMATE OVERALL.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-106-1743, 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
A-33891-A
NSN: 4730-00-106-1743
FSC: 4730
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
height2.040 INCHES NOMINAL IN
materialSTEEL OVERALL
shank_length0.438 INCHES NOMINAL IN
special_featuresFURNISHED WITH 0.250 IN. PIPE COUPLING IN
style_designatorSTRAIGHT, CAP FEED
surface_treatmentDICHROMATE OVERALL
nominal_thread_size0.250 INCHES IN
assembly_clearance_radius0.713 INCHES NOMINAL IN
screw_thread_series_designatorNPT
NSN4730-00-106-1743
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A-33891-A · 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
•
SCREW THREAD SERIES DESIGNATOR: NPT
•
ASSEMBLY CLEARANCE RADIUS: 0.713 INCHES NOMINAL IN
•
HEIGHT: 2.040 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
SURFACE TREATMENT: DICHROMATE OVERALL
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: STRAIGHT, CAP FEED
TECHNICAL CHARACTERISTICS (FLIS)
SCREW THREAD SERIES DESIGNATORNPT
ASSEMBLY CLEARANCE RADIUS0.713 INCHES NOMINAL IN
SPECIAL FEATURESFURNISHED WITH 0.250 IN. PIPE COUPLING IN
HEIGHT2.040 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
SURFACE TREATMENTDICHROMATE OVERALL
MATERIALSTEEL OVERALL
STYLE DESIGNATORSTRAIGHT, CAP FEED
SHANK LENGTH0.438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
33891-AInterchangeable
interchangeable cross-reference
interchangeable
3505-16Interchangeable
interchangeable cross-reference
interchangeable
A-803455-0-01Interchangeable
interchangeable cross-reference
interchangeable
3504-5-70Interchangeable
Same NIIN cross-reference
interchangeable
0 FEMALEInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-33891-A?
A-33891-A is a CUP,GREASE.
What parts can replace A-33891-A?
There are 5 known substitutes for A-33891-A: 33891-A, 3505-16, A-803455-0-01 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-33891-A?
A-33891-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-106-1743. 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