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PartsTable / COMPONENT / A-637-20125-1
A-637-20125-1 ✓ 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

FITTING,LUBRICANT PRESSURE RELIE. Key specifications include material: NICKEL ALLOY, case_style: SQUARE, link_style: CLEVIS ENDS, point_type: CONVENTIONAL, seal_width: 0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN, test_media: SALIVA. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-515-7684, 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
A-637-20125-1
NSN: 4730-01-515-7684
FSC: 4730
CAGE: 72166 — B.W. ELLIOTT MANUFACTURING CO., LLC (USA)
SPECIFICATIONS
materialNICKEL ALLOY
case_styleSQUARE
link_styleCLEVIS ENDS
point_typeCONVENTIONAL
seal_width0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
test_mediaSALIVA
flat_height0.062 INCHES NOMINAL IN
point_angle118.0 DEGREES NOMINAL
shank_styleSTANDARD TAPER W/TANG
flute_length9.000 INCHES NOMINAL IN
pin_diameter0.025 INCHES NOMINAL IN
usage_designFOR DETECTION OF GROUP A STREPTOCOCCAL INFECTION
NSN4730-01-515-7684
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A-637-20125-1 · 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 20
201-25Interchangeable
interchangeable cross-reference
interchangeable
672-1001-000Interchangeable
interchangeable cross-reference
interchangeable
134-021-0002Interchangeable
interchangeable cross-reference
interchangeable
110 1-25/64Interchangeable
interchangeable cross-reference
interchangeable
53189Interchangeable
interchangeable cross-reference
interchangeable
1302Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-637-20125-1?
A-637-20125-1 is a FITTING,LUBRICANT PRESSURE RELIE.
What parts can replace A-637-20125-1?
There are 20 known substitutes for A-637-20125-1: 201-25, 672-1001-000, 134-021-0002 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-637-20125-1?
A-637-20125-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-515-7684. 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