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Technical Data Sheet
PartsTable / COMPONENT / 4121-A
4121-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 ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 360 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.469 INCHES NOMINAL IN, seat_angle: 45.00 DEGREES NOMINAL, thread_class: 2B, thread_series: UNEF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-1537, 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
4121-A
NSN: 4730-00-287-1537
FSC: 4730
CAGE: 28265 — HERCULES ENGINE CO INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 360 OVERALL
nut_styleTUBE COUPLING
nut_height0.469 INCHES NOMINAL IN
seat_angle45.00 DEGREES NOMINAL
thread_class2B
thread_seriesUNEF
special_featuresGRUMMAN A-10 AIRECRAT
thread_directionRIGHT-HAND
length_to_shoulder0.281 INCHES NOMINAL IN
width_across_flats0.625 INCHES NOMINAL IN
nominal_thread_size0.562 INCHES IN
smallest_inside_diameter0.383 INCHES NOMINAL IN
NSN4730-00-287-1537
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4121-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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2B
•
LENGTH TO SHOULDER: 0.281 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD SERIES: UNEF
•
WIDTH ACROSS FLATS: 0.625 INCHES NOMINAL IN
•
NUT HEIGHT: 0.469 INCHES NOMINAL IN
•
SMALLEST INSIDE DIAMETER: 0.383 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
LENGTH TO SHOULDER0.281 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626,1/2 H FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIESUNEF
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
NUT HEIGHT0.469 INCHES NOMINAL IN
SMALLEST INSIDE DIAMETER0.383 INCHES NOMINAL IN
SPECIAL FEATURESGRUMMAN A-10 AIRECRAT
THREAD QUANTITY PER INCH24
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
12-010Interchangeable
interchangeable cross-reference
interchangeable
1887757Interchangeable
interchangeable cross-reference
interchangeable
A162618Interchangeable
interchangeable cross-reference
interchangeable
76038Interchangeable
interchangeable cross-reference
interchangeable
91793Interchangeable
interchangeable cross-reference
interchangeable
204761DH6CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4121-A?
4121-A is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 4121-A?
There are 20 known substitutes for 4121-A: 12-010, 1887757, A162618 and 17 more. Substitute compatibility should be verified for your specific system.
Is 4121-A still available?
4121-A 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