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631640 ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, flow_angle: 90.0 DEGREES, leg_length: 0.312 INCHES NOMINAL FIRST END IN, thread_class: 3A SECOND END A, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, special_features: GRUMMAN A10 AIR CRAFT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-104-1936, 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
631640
NSN: 4730-00-104-1936
FSC: 4730
CAGE: 1CS58 — MINE SAFETY APPLIANCES COMPANY (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
flow_angle90.0 DEGREES
leg_length0.312 INCHES NOMINAL FIRST END IN
thread_class3A SECOND END A
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
special_featuresGRUMMAN A10 AIR CRAFT
nominal_thread_size0.190 INCHES ALL ENDS IN
thread_series_designatorUNF ALL ENDS
NSN4730-00-104-1936
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 631640 · 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
•
LEG LENGTH: 0.344 INCHES NOMINAL SECOND END IN
•
FLOW ANGLE: 90.0 DEGREES
•
MATERIAL: COPPER ALLOY OVERALL
•
CONNECTION STYLE: GASKET SEAL (BOSS) FIRST END
•
THREAD CLASS: 3B FIRST END
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
NOMINAL THREAD SIZE: 0.190 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
LEG LENGTH0.344 INCHES NOMINAL SECOND END IN
SPECIAL FEATURESGRUMMAN A10 AIR CRAFT
FLOW ANGLE90.0 DEGREES
MATERIALCOPPER ALLOY OVERALL
CONNECTION STYLEGASKET SEAL (BOSS) FIRST END
THREAD CLASS3B FIRST END
THREAD SERIES DESIGNATORUNF ALL ENDS
NOMINAL THREAD SIZE0.190 INCHES ALL ENDS IN
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
LEG LENGTH0.312 INCHES NOMINAL FIRST END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
SB340 MOD3 D08Interchangeable
interchangeable cross-reference
interchangeable
3228404-1Interchangeable
interchangeable cross-reference
interchangeable
3228404Interchangeable
interchangeable cross-reference
interchangeable
AN6227-28Interchangeable
interchangeable cross-reference
interchangeable
AN6227-28ESInterchangeable
interchangeable cross-reference
interchangeable
SP3128PCSP3128Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 631640?
631640 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 631640?
There are 26 known substitutes for 631640: SB340 MOD3 D08, 3228404-1, 3228404 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 631640?
631640 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-104-1936. 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