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GB520 ✓ 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 REACTOR is a the manufacturer industrial component. Key specifications include height: 0.281 INCHES NOMINAL IN, material: STEEL OVERALL, body_length: 0.469 INCHES MAXIMUM IN, shank_length: 0.250 INCHES NOMINAL IN, rating_method: ELECTRICAL SINGLE COMPONENT ALL WINDING, inclosure_type: HERMETICALLY SEALED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5757, 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
GB520
NSN: 4730-00-278-5757
FSC: 4730
CAGE: 0BT82 — GITS MFG CO INC (USA)
SPECIFICATIONS
height0.281 INCHES NOMINAL IN
materialSTEEL OVERALL
body_length0.469 INCHES MAXIMUM IN
shank_length0.250 INCHES NOMINAL IN
rating_methodELECTRICAL SINGLE COMPONENT ALL WINDING
inclosure_typeHERMETICALLY SEALED
shank_diameter0.190 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
inductance_typeFIXED
mounting_methodTERMINAL SINGLE GROUP
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorSTRAIGHT, W/BALL CHECK, W/SHOULDER
winding_quantity2 SINGLE COMPONENT
NSN4730-00-278-5757
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GB520 · 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
•
HEIGHT: 0.281 INCHES NOMINAL IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
ASSEMBLY CLEARANCE RADIUS: 0.109 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT, W/BALL CHECK, W/SHOULDER
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: NICKEL OVERALL
•
SHANK DIAMETER: 0.190 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HEIGHT0.281 INCHES NOMINAL IN
CRITICALITY CODE JUSTIFICATIONFEAT
ASSEMBLY CLEARANCE RADIUS0.109 INCHES NOMINAL IN
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
STYLE DESIGNATORSTRAIGHT, W/BALL CHECK, W/SHOULDER
MATERIALSTEEL OVERALL
SURFACE TREATMENTNICKEL OVERALL
SHANK DIAMETER0.190 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
SHANK LENGTH0.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
3-66391Interchangeable
interchangeable cross-reference
interchangeable
00520Interchangeable
interchangeable cross-reference
interchangeable
2661058B018Interchangeable
interchangeable cross-reference
interchangeable
MS29513-18Interchangeable
interchangeable cross-reference
interchangeable
MS29513-018Interchangeable
interchangeable cross-reference
interchangeable
581-6405749 FIND AHDA B41Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GB520?
GB520 is a REACTOR.
What parts can replace GB520?
There are 14 known substitutes for GB520: 3-66391, 00520, 2661058B018 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GB520?
GB520 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-5757. 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