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SPC21578 — STANDOFF,THREADED,SPACING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

SPC21578: STANDOFF,THREADED,SPACING.

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 0.500 INCHES NOMINAL IN, material: ALUMINUM OVERALL, thread_length: 0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN, style_designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD, thread_direction: RIGHT-HAND RIGHT EXTERNAL, surface_treatment: CHROMATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-617-9254, 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
SPC21578
NSN: 5340-01-617-9254
FSC: 5340 — Hardware, Commercial
CAGE: 0VY29 — MULTICOMP, INC DBA LABELONCE CORPORATION (USA)
SPECIFICATIONS
length0.500 INCHES NOMINAL IN
materialALUMINUM OVERALL
thread_length0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
style_designatorLEFT INTERNAL AND RIGHT EXTERNAL THREAD
thread_directionRIGHT-HAND RIGHT EXTERNAL
surface_treatmentCHROMATE OVERALL
width_across_flats0.250 INCHES NOMINAL IN
nominal_thread_size0.138 INCHES RIGHT EXTERNAL IN
cross-sectional_shapeHEXAGON
end_item_identificationNSN 1425-01-442-4821
right_projection_length0.250 INCHES NOMINAL IN
thread_quantity_per_inch32 LEFT INTERNAL (INCLUDES THRU THREAD)
NSN5340-01-617-9254
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: SPC21578 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
•
WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN
•
LENGTH: 0.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.250 INCHES NOMINAL RIGHT EXTERNAL IN
•
STYLE DESIGNATOR: LEFT INTERNAL AND RIGHT EXTERNAL THREAD
•
THREAD DIRECTION: RIGHT-HAND RIGHT EXTERNAL
•
NOMINAL THREAD SIZE: 0.138 INCHES RIGHT EXTERNAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.250 INCHES NOMINAL IN
LENGTH0.500 INCHES NOMINAL IN
THREAD LENGTH0.250 INCHES NOMINAL RIGHT EXTERNAL IN
THREAD LENGTH0.375 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
STYLE DESIGNATORLEFT INTERNAL AND RIGHT EXTERNAL THREAD
THREAD DIRECTIONRIGHT-HAND RIGHT EXTERNAL
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
NOMINAL THREAD SIZE0.138 INCHES RIGHT EXTERNAL IN
NOMINAL THREAD SIZE0.138 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
CROSS-SECTIONAL SHAPEHEXAGON
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
11M2195Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 SPC21578?
SPC21578 is a STANDOFF,THREADED,SPACING.
What parts can replace SPC21578?
There is 1 known substitute for SPC21578: 11M2195. Substitute compatibility should be verified for your specific system.
What is the NSN for SPC21578?
SPC21578 is cataloged in the U.S. Government catalog under NSN 5340-01-617-9254. 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.