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581531 ✓ 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,CLAMP,PIPE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061, hole_diameter: 0.169 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN, overall_width: 1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN, aperture_width: 0.493 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN, overall_length: 1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN, aperture_length: 1.118 INCHES MINIMUM AND 1.126 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-400-8972, 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
581531
NSN: 4730-00-400-8972
FSC: 4730
CAGE: 75906 — PACIFIC CONSOLIDATED INDUSTRIES LLC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061
hole_diameter0.169 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN
overall_width1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN
aperture_width0.493 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
overall_length1.860 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN
aperture_length1.118 INCHES MINIMUM AND 1.126 INCHES MAXIMUM IN
special_featuresONE FACE HAS TWO ROUND GROOVES,ONE GROOVE IS 0.112 IN. W,OD 1.496 IN. 0.345 IN. DP,OTHER GROOVE IS 0.118 IN. W,OD 1.800 IN.,0.071 IN. DP IN
style_designatorNON-CIRCULAR W/BOLT HOLES
surface_treatmentCHROMATE
bolt_hole_quantity4
inside_corner_radius0.016 INCHES NOMINAL IN
material_document_and_classificationQQ-A-225/8,T6 FED SPEC SINGLE MATERIAL RESPONSE
NSN4730-00-400-8972
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 581531 · 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
•
END TYPE FOR WHICH DESIGNED: GROOVED
•
PIPE SIZE ACCOMMODATED: 2.000 INCHES NOMINAL IN
•
MATERIAL: IRON MALLEABLE HOUSING
•
SEGMENT QUANTITY: 2
TECHNICAL CHARACTERISTICS (FLIS)
END TYPE FOR WHICH DESIGNEDGROOVED
PIPE SIZE ACCOMMODATED2.000 INCHES NOMINAL IN
MATERIALIRON MALLEABLE HOUSING
SEGMENT QUANTITY2
MATERIALRUBBER GASKET
SPECIAL FEATURESGASKET MATERIAL: GRADE H RUBBER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
2CR964Interchangeable
interchangeable cross-reference
interchangeable
8187Interchangeable
interchangeable cross-reference
interchangeable
581531Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-10387Interchangeable
interchangeable cross-reference
interchangeable
M10387-2-D-02Interchangeable
interchangeable cross-reference
interchangeable
77E1INInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 581531?
581531 is a COUPLING,CLAMP,PIPE.
What parts can replace 581531?
There are 16 known substitutes for 581531: 2CR964, 8187, 581531 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 581531?
581531 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-400-8972. 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