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GC501S ✓ 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

RESISTOR,VARIABLE,WIRE WOUND,PRE. Key specifications include material: STEEL COMP 305 OVERALL, overall_width: 13.0 MILLIMETERS NOMINAL MM, inside_diameter: 17.0 MILLIMETERS MINIMUM AND 32.0 MILLIMETERS MAXIMUM MM, special_features: FOR MARINE AND UNDERGROUND USE; 100 PERCENT NON-MAGNETIC, style_designator: WIRE, surface_treatment: PASSIVATE BAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-134-4222, 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
GC501S
NSN: 4730-00-134-4222
FSC: 4730
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 305 OVERALL
overall_width13.0 MILLIMETERS NOMINAL MM
inside_diameter17.0 MILLIMETERS MINIMUM AND 32.0 MILLIMETERS MAXIMUM MM
special_featuresFOR MARINE AND UNDERGROUND USE; 100 PERCENT NON-MAGNETIC
style_designatorWIRE
surface_treatmentPASSIVATE BAND
fastening_device_typeSLOTTED HEXAGON HEAD SCREW
end_item_identificationDETROIT DIESEL ENGINE POWERED LANDING CRAFT,NAVY DESIGN LCM 8,MOD 1
material_document_and_classificationMIL-S-5059,1/4 OR 1/2 HARD MIL SPEC SINGLE MATERIAL RESPONSE BAND
NSN4730-00-134-4222
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: GC501S · 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
•
MATERIAL: STEEL SCREW
•
STYLE DESIGNATOR: WIRE
•
SURFACE TREATMENT: ZINC SCREW
•
FASTENING DEVICE TYPE: SLOTTED HEXAGON HEAD SCREW
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL SCREW
MATERIALSTEEL COMP 301 BAND
STYLE DESIGNATORWIRE
END ITEM IDENTIFICATIONDETROIT DIESEL ENGINE POWERED LANDING CRAFT,NAVY DESIGN LCM 8,MOD 1
SURFACE TREATMENTZINC SCREW
SURFACE TREATMENTPASSIVATE BAND
OVERALL WIDTH0.500 INCHES NOMINAL IN
FASTENING DEVICE TYPESLOTTED HEXAGON HEAD SCREW
INSIDE DIAMETER2.812 INCHES MINIMUM AND 3.750 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
687456C1Interchangeable
interchangeable cross-reference
interchangeable
16KP261Interchangeable
interchangeable cross-reference
interchangeable
TY22470Interchangeable
interchangeable cross-reference
interchangeable
S604Interchangeable
interchangeable cross-reference
interchangeable
MS35338-8Interchangeable
interchangeable cross-reference
interchangeable
40S33Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GC501S?
GC501S is a RESISTOR,VARIABLE,WIRE WOUND,PRE.
What parts can replace GC501S?
There are 27 known substitutes for GC501S: 687456C1, 16KP261, TY22470 and 24 more. Substitute compatibility should be verified for your specific system.
Is GC501S still available?
GC501S is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026