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509621 — Technical Data Sheet

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— · 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: STEEL, specific_use: MOTOR, construction_type: ONE PIECE, flow_control_device: DISK, valve_operation_method: AUTOMATIC, end_item_identification: WASP CLASS LHD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-01-395-2254, 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
509621
NSN: 4730-01-395-2254
FSC: 4730
CAGE: 7ZL65 — LEVEL 10 INDUSTRIES, INC. DIV LEVEL 10 INDUSTRIES (USA)
SPECIFICATIONS
materialSTEEL
specific_useMOTOR
construction_typeONE PIECE
flow_control_deviceDISK
valve_operation_methodAUTOMATIC
end_item_identificationWASP CLASS LHD
valve_design_control_activity24047
NSN4730-01-395-2254
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 509621 · 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 6
508054InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SH8796InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
528604InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SH-8796 PC100InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
528603InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SH8796 DET 1InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 509621?
509621 is a FITTING,LUBRICANT PRESSURE RELIE.
What parts can replace 509621?
There are 6 known substitutes for 509621: 508054, SH8796, 528604 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 509621?
509621 is cataloged in the Federal Logistics Information System under NSN 4730-01-395-2254. 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: October 2026