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Technical Data Sheet
PartsTable / COMPONENT / 3H21
3H21 ✓ 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 COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include shank_style: INTERNALLY THREADED W/BEAD AND WRENCH FLATS AND INSPECTION HOLE, thread_class: 3B, bore_diameter: 0.1895 INCHES MINIMUM AND 0.1915 INCHES MAXIMUM IN, overall_length: 1.7810 INCHES NOMINAL IN, thread_diameter: 0.250 INCHES NOMINAL IN, special_features: INSPECT MAGNETIC PER MIL-I-6868 ORMIL-I-6866 IDENTIFY ON SHANK. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-840-2133, 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
3H21
NSN: 4730-00-840-2133
FSC: 4730
CAGE: 73992 — TUTHILL CORP HANSEN COUPLING DIV (USA)
SPECIFICATIONS
shank_styleINTERNALLY THREADED W/BEAD AND WRENCH FLATS AND INSPECTION HOLE
thread_class3B
bore_diameter0.1895 INCHES MINIMUM AND 0.1915 INCHES MAXIMUM IN
overall_length1.7810 INCHES NOMINAL IN
thread_diameter0.250 INCHES NOMINAL IN
special_featuresINSPECT MAGNETIC PER MIL-I-6868 ORMIL-I-6866 IDENTIFY ON SHANK
style_designatorBALL TYPE
thread_directionRIGHT-HAND
surface_treatmentCHROMIUM INNER MEMBER
inner_member_width0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
outer_member_width0.3230 INCHES MINIMUM AND 0.3280 INCHES MAXIMUM IN
lubrication_featureGROOVE INTERNAL OUTER MEMBER
NSN4730-00-840-2133
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3H21 · 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 15
H362Interchangeable
interchangeable cross-reference
interchangeable
HDCL3DN3SNBX1-60A600VACInterchangeable
interchangeable cross-reference
interchangeable
H3168Interchangeable
interchangeable cross-reference
interchangeable
BB3240-40Interchangeable
interchangeable cross-reference
interchangeable
M3240-20Interchangeable
interchangeable cross-reference
interchangeable
H3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3H21?
3H21 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 3H21?
There are 15 known substitutes for 3H21: H362, HDCL3DN3SNBX1-60A600VAC, H3168 and 12 more. Substitute compatibility should be verified for your specific system.
Is 3H21 still available?
3H21 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