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Technical Data Sheet
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8667991 — Technical Data Sheet

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— · 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,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_type: SOLID, nut_style: TUBE FITTING LOCKNUT, seat_type: BEVELED, flow_angle: 90.0 DEGREES, leg_length: 0.59 INCHES NOMINAL FIRST END IN. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-203-3831, 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
8667991
NSN: 4730-00-203-3831
FSC: 4730
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_typeSOLID
nut_styleTUBE FITTING LOCKNUT
seat_typeBEVELED
flow_angle90.0 DEGREES
leg_length0.59 INCHES NOMINAL FIRST END IN
nut_height0.310 INCHES NOMINAL IN
seat_angle37.0 DEGREES FIRST END
sweep_typeLONG
head_height0.38 INCHES MINIMUM IN
temp_rating-40.0 FAHRENHEIT AND 212.0 FAHRENHEIT SINGLE RESPONSE DEGF
thread_size3/4-12
NSN4730-00-203-3831
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 8667991 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
3186InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
47926InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
50624X0.312InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS16536-153InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
46513InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GB1616X0HInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8667991?
8667991 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 8667991?
There are 32 known substitutes for 8667991: 3186, 47926, 50624X0.312 and 29 more. Substitute compatibility should be verified for your specific system.
Is 8667991 still available?
8667991 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: September 2026