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6658789-1 — STOP,MECHANICAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6658789-1: STOP,MECHANICAL.

The STOP,MECHANICAL is a the manufacturer industrial component. Key specifications include material: STEEL, design_type: STRAIGHT, thread_class: 2B, overall_width: 1.370 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN, overall_height: 1.156 INCHES NOMINAL IN, overall_length: 3.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-369-3583, 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
6658789-1
NSN: 5340-01-369-3583
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL
design_typeSTRAIGHT
thread_class2B
overall_width1.370 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
overall_height1.156 INCHES NOMINAL IN
overall_length3.500 INCHES NOMINAL IN
nominal_thread_size1.000 INCHES IN
thread_quantity_per_inch12
thread_series_designatorUNF
material_document_and_classificationAISI 4340 ASSN STD SINGLE MATERIAL RESPONSE
NSN5340-01-369-3583
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6658789-1 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
•
DESIGN TYPE: STRAIGHT
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 4340 ASSN STD SINGLE MATERIAL RESPONSE
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
THREAD CLASS: 2B
•
THREAD QUANTITY PER INCH: 12
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.156 INCHES NOMINAL IN
DESIGN TYPESTRAIGHT
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 4340 ASSN STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH3.500 INCHES NOMINAL IN
OVERALL WIDTH1.370 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN
NOMINAL THREAD SIZE1.000 INCHES IN
THREAD CLASS2B
THREAD QUANTITY PER INCH12
MATERIALSTEEL
THREAD SERIES DESIGNATORUNF
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6658789-1?
6658789-1 is a STOP,MECHANICAL.
What is the NSN for 6658789-1?
6658789-1 is cataloged in the U.S. Government catalog under NSN 5340-01-369-3583. 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.