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G398-8 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

G398-8: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN, diameter: 0.250 INCHES NOMINAL IN, material: ALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 2017 OVERALL, thread_length: 0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN, style_designator: LEFT INTERNAL AND RIGHT INTERNAL THREADS, cross-sectional_shape: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-069-9347, 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
G398-8
NSN: 5340-01-069-9347
FSC: 5340 — Hardware, Commercial
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
length0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
diameter0.250 INCHES NOMINAL IN
materialALUMINUM ALLOY 2024 OR ALUMINUM ALLOY 2017 OVERALL
thread_length0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
style_designatorLEFT INTERNAL AND RIGHT INTERNAL THREADS
cross-sectional_shapeROUND
left_counterbore_depth0.094 INCHES NOMINAL IN
right_counterbore_depth0.094 INCHES NOMINAL IN
left_counterbore_diameter0.171 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
right_counterbore_diameter0.171 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
material_document_and_classificationQQ-A-200/3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-225/5 FED SPEC 2ND MATERIAL RESPONSE OVERALL
NSN5340-01-069-9347
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: G398-8 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
•
RIGHT COUNTERBORE DIAMETER: 0.171 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
•
LEFT COUNTERBORE DEPTH: 0.094 INCHES NOMINAL IN
•
LENGTH: 0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL RIGHT INTERNAL IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT INTERNAL THREADS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-200/3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-225/5 FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
RIGHT COUNTERBORE DIAMETER0.171 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
LEFT COUNTERBORE DEPTH0.094 INCHES NOMINAL IN
LENGTH0.995 INCHES MINIMUM AND 1.005 INCHES MAXIMUM IN
THREAD LENGTH0.375 INCHES NOMINAL RIGHT INTERNAL IN
THREAD LENGTH0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT INTERNAL THREADS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-200/3 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-A-225/6 FED SPEC 1ST MATERIAL RESPONSE OR QQ-A-225/5 FED SPEC 2ND MATERIAL RESPONSE OVERALL
DIAMETER0.250 INCHES NOMINAL IN
RIGHT COUNTERBORE DEPTH0.094 INCHES NOMINAL IN
LEFT COUNTERBORE DIAMETER0.171 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN
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 G398-8?
G398-8 is a STANDOFF,THREADED,SPACING.
What is the NSN for G398-8?
G398-8 is cataloged in the U.S. Government catalog under NSN 5340-01-069-9347. 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.