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Technical Data Sheet
PartsTable / COMPONENT / 1991HX
1991HX ✓ 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

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include material: IRON OVERALL, body_type: SOLID, head_type: SOLID, nut_style: PIPE LOCKNUT, core_depth: 0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN, nut_height: 0.250 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-202-6668, 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
1991HX
NSN: 4730-00-202-6668
FSC: 4730
CAGE: 75Q65 — OSHKOSH DEFENSE LLC (USA)
SPECIFICATIONS
materialIRON OVERALL
body_typeSOLID
head_typeSOLID
nut_stylePIPE LOCKNUT
core_depth0.594 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
nut_height0.250 INCHES NOMINAL IN
thread_class3A EXTERNAL A
thread_seriesNPT
exterior_colorSILVER OVERALL
drive_end_styleRAISED SQUARE
connection_stylePLAIN
special_featuresHEAD HEIGHT: 0.500 IN. NOM.;BODY LENGTH: 0.750 IN. NOM. IN
NSN4730-00-202-6668
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1991HX · 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 14
22158Interchangeable
interchangeable cross-reference
interchangeable
SM-A-617906-9Interchangeable
interchangeable cross-reference
interchangeable
203NInterchangeable
interchangeable cross-reference
interchangeable
B133Interchangeable
interchangeable cross-reference
interchangeable
884-10-325000HMSP0RMInterchangeable
interchangeable cross-reference
interchangeable
144033Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1991HX?
1991HX is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace 1991HX?
There are 14 known substitutes for 1991HX: 22158, SM-A-617906-9, 203N and 11 more. Substitute compatibility should be verified for your specific system.
Is 1991HX still available?
1991HX 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