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81931-01 — ADAPTER,STRAIGHT,PIPE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

81931-01: ADAPTER,STRAIGHT,PIPE TO TUBE.

The ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include head_style: FLAT EXTENDED WASHER, head_length: 4.5 MILLIMETERS NOMINAL MM, handle_length: 4.5 MILLIMETERS NOMINAL MM, head_diameter: 20.0 MILLIMETERS NOMINAL MM, fastener_length: 15.0 MILLIMETERS NOMINAL MM, handle_diameter: 15.0 MILLIMETERS NOMINAL MM. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-322-8225, 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
81931-01
NSN: 4730-00-322-8225
NIINs: 003228225, 016752706
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
head_styleFLAT EXTENDED WASHER
head_length4.5 MILLIMETERS NOMINAL MM
handle_length4.5 MILLIMETERS NOMINAL MM
head_diameter20.0 MILLIMETERS NOMINAL MM
fastener_length15.0 MILLIMETERS NOMINAL MM
handle_diameter15.0 MILLIMETERS NOMINAL MM
special_featuresTHREAD SIZE M6; SETTING TOOL PMT6/PMTC6
tee_head_flange_thickness5.5 MILLIMETERS NOMINAL MM
part_name_assigned_by_controlling_agencyMALE EARTH BOND
NSN4730-00-322-8225
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 81931-01 · 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
SUBSTITUTES & CROSS-REFERENCES 5
MS51500A8-4SReference document
Same NSN cross-reference
Reference document — Secondary reference
0103-4-8CReference document
Same NSN cross-reference
Reference document — Secondary reference
8-4FBTX-SSReference document
Same NSN cross-reference
Reference document — Secondary reference
MS51500B8-4SReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MIL-DTL-18866Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 81931-01?
81931-01 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 81931-01?
There are 5 known substitutes for 81931-01: MS51500A8-4S, 0103-4-8C, 8-4FBTX-SS and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 81931-01?
81931-01 is cataloged in the U.S. Government catalog under NSN 4730-00-322-8225. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.