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Technical Data Sheet
PartsTable / COMPONENT / 311861
311861 ✓ 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 BOLT,FLUID PASSAGE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 1100 OVERALL, head_style: OVAL COUNTERSUNK, shank_style: STRAIGHT W/RADIUS CHAMFERED TIP, shank_diameter: 0.1875 INCHES NOMINAL IN, fastener_length: 0.500 INCHES NOMINAL IN, end_item_identification: 2320-01-529-2251 TRUCK, BOMB SERVICE; MRAP BUFFALO MK2A2. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-218-5787, 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
311861
NSN: 4730-00-218-5787
FSC: 4730
CAGE: 14541 — COOPER MACHINERY SERVICES LLC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 1100 OVERALL
head_styleOVAL COUNTERSUNK
shank_styleSTRAIGHT W/RADIUS CHAMFERED TIP
shank_diameter0.1875 INCHES NOMINAL IN
fastener_length0.500 INCHES NOMINAL IN
end_item_identification2320-01-529-2251 TRUCK, BOMB SERVICE; MRAP BUFFALO MK2A2
part_name_assigned_by_controlling_agencySOLID RIVET
NSN4730-00-218-5787
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 311861 · 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
•
WIDTH ACROSS FLATS: 1.500 INCHES NOMINAL IN
•
DISTANCE FROM FIRST RADIAL HOLE CENTER TO END OF BOLT: 1.375 INCHES NOMINAL IN
•
FIRST END THREAD SERIES DESIGNATOR: UNF
•
EXTENDED WASHER DIAMETER: 2.113 INCHES NOMINAL IN
•
CONCENTRIC HOLE DEPTH: 2.000 INCHES NOMINAL IN
•
FIRST END THREAD CLASS: 2B
•
FIRST END THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.500 INCHES NOMINAL IN
DISTANCE FROM FIRST RADIAL HOLE CENTER TO END OF BOLT1.375 INCHES NOMINAL IN
OVERALL LENGTH3.000 INCHES NOMINAL IN
FIRST END THREAD SERIES DESIGNATORUNF
EXTENDED WASHER DIAMETER2.113 INCHES NOMINAL IN
CONCENTRIC HOLE DEPTH2.000 INCHES NOMINAL IN
FIRST END THREAD CLASS2B
FIRST END THREAD DIRECTIONRIGHT-HAND
CONCENTRIC HOLE DIAMETER0.812 INCHES NOMINAL IN
BODY STYLERELIEVED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
31186Interchangeable
interchangeable cross-reference
interchangeable
40209Interchangeable
interchangeable cross-reference
interchangeable
65876Interchangeable
interchangeable cross-reference
interchangeable
N6140BInterchangeable
interchangeable cross-reference
interchangeable
84TD-902Interchangeable
interchangeable cross-reference
interchangeable
50654Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 311861?
311861 is a BOLT,FLUID PASSAGE.
What parts can replace 311861?
There are 15 known substitutes for 311861: 31186, 40209, 65876 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 311861?
311861 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-218-5787. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026