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206639-1 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

206639-1: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.3750 INCHES NOMINAL IN, diameter: 0.2500 INCHES NOMINAL IN, thread_class: 2A RIGHT EXTERNAL A, thread_length: 0.1875 INCHES NOMINAL RIGHT EXTERNAL IN, style_designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD, thread_direction: RIGHT-HAND RIGHT EXTERNAL. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-442-0883, 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
206639-1
NSN: 5340-01-442-0883
FSC: 5340 — Hardware, Commercial
CAGE: 0AF43 — TRANSISTOR DEVICES INC FLORIDA DIV (USA)
SPECIFICATIONS
length0.3750 INCHES NOMINAL IN
diameter0.2500 INCHES NOMINAL IN
thread_class2A RIGHT EXTERNAL A
thread_length0.1875 INCHES NOMINAL RIGHT EXTERNAL IN
style_designatorLEFT INTERNAL AND RIGHT EXTERNAL THREAD
thread_directionRIGHT-HAND RIGHT EXTERNAL
surface_treatmentPASSIVATE STANDOFF
nominal_thread_size0.1120 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
cross-sectional_shapeROUND
right_projection_length0.1875 INCHES NOMINAL IN
thread_quantity_per_inch40 RIGHT EXTERNAL
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) RIGHT EXTERNAL
NSN5340-01-442-0883
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 206639-1 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
•
LENGTH: 0.3750 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE STANDOFF
•
THREAD LENGTH: 0.2500 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT EXTERNAL THREAD
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-A-582 ASSN STD SINGLE MATERIAL RESPONSE STANDOFF
•
DIAMETER: 0.2500 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND RIGHT EXTERNAL
TECHNICAL CHARACTERISTICS
LENGTH0.3750 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE STANDOFF
THREAD LENGTH0.2500 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
THREAD LENGTH0.1875 INCHES NOMINAL RIGHT EXTERNAL IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT EXTERNAL THREAD
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-A-582 ASSN STD SINGLE MATERIAL RESPONSE STANDOFF
DIAMETER0.2500 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
NOMINAL THREAD SIZE0.1120 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) 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 1
9783-SS-0440-0256-7Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 206639-1?
206639-1 is a STANDOFF,THREADED,SPACING.
What parts can replace 206639-1?
There is 1 known substitute for 206639-1: 9783-SS-0440-0256-7. Substitute compatibility should be verified for your specific system.
What is the NSN for 206639-1?
206639-1 is cataloged in the U.S. Government catalog under NSN 5340-01-442-0883. 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.