PartsTable
Technical Data Sheet

3/4 HHP — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3/4 HHP: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include thread_length: 0.62 INCHES NOMINAL IN, open_end_inside_diameter: 0.5625 INCHES NOMINAL IN, thread_quantity_per_inch: 14, thread_series_designator: NPT, part_name_assigned_by_controlling_agency: HOLLOW HEX PIPE PLUG. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-666-7671, 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
3/4 HHP
NSN: 5340-01-666-7671
FSC: 5340 — Hardware, Commercial
CAGE: 50948 — PARKER HANNIFIN CORP STRATOFLEX DIV AIRCRAFT FITTINGS OPN (USA)
SPECIFICATIONS
thread_length0.62 INCHES NOMINAL IN
open_end_inside_diameter0.5625 INCHES NOMINAL IN
thread_quantity_per_inch14
thread_series_designatorNPT
part_name_assigned_by_controlling_agencyHOLLOW HEX PIPE PLUG
NSN5340-01-666-7671
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3/4 HHP MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD LENGTH: 0.62 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 0.5625 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 14
•
THREAD SERIES DESIGNATOR: NPT
TECHNICAL CHARACTERISTICS
THREAD LENGTH0.62 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER0.5625 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYHOLLOW HEX PIPE PLUG
THREAD QUANTITY PER INCH14
THREAD SERIES DESIGNATORNPT
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3/4 HHP?
3/4 HHP is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What is the NSN for 3/4 HHP?
3/4 HHP is cataloged in the U.S. Government catalog under NSN 5340-01-666-7671. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.