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PartsTable / COMPONENT / 3174AS4621
3174AS4621 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The STANDOFF,THREADED,SPACING is a the manufacturer industrial component. Key specifications include length: 3.7500 INCHES NOMINAL IN, material: ALUMINUM STANDOFF, thread_class: 2B LEFT INTERNAL (INCLUDES THRU THREAD), thread_length: 3.7500 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN, style_designator: INTERNALLY THREADED FULL LENGTH, thread_direction: RIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD). This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-424-2997, 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
3174AS4621
NSN: 5340-01-424-2997
FSC: 5340
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
length3.7500 INCHES NOMINAL IN
materialALUMINUM STANDOFF
thread_class2B LEFT INTERNAL (INCLUDES THRU THREAD)
thread_length3.7500 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
style_designatorINTERNALLY THREADED FULL LENGTH
thread_directionRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
surface_treatmentCHROMATE STANDOFF
width_across_flats0.3125 INCHES NOMINAL IN
nominal_thread_size0.1380 INCHES LEFT INTERNAL (INCLUDES THRU THREAD) IN
cross-sectional_shapeHEXAGON
thread_quantity_per_inch32 LEFT INTERNAL (INCLUDES THRU THREAD)
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD)
NSN5340-01-424-2997
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3174AS4621 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 CLASS: 2B LEFT INTERNAL (INCLUDES THRU THREAD)
•
WIDTH ACROSS FLATS: 0.3125 INCHES NOMINAL IN
•
SURFACE TREATMENT: CHROMATE STANDOFF
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD)
•
STYLE DESIGNATOR: INTERNALLY THREADED FULL LENGTH
•
CROSS-SECTIONAL SHAPE: HEXAGON
•
LENGTH: 3.7500 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 32 LEFT INTERNAL (INCLUDES THRU THREAD)
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B LEFT INTERNAL (INCLUDES THRU THREAD)
WIDTH ACROSS FLATS0.3125 INCHES NOMINAL IN
SURFACE TREATMENTCHROMATE STANDOFF
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) LEFT INTERNAL (INCLUDES THRU THREAD)
STYLE DESIGNATORINTERNALLY THREADED FULL LENGTH
CROSS-SECTIONAL SHAPEHEXAGON
LENGTH3.7500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH32 LEFT INTERNAL (INCLUDES THRU THREAD)
THREAD LENGTH3.7500 INCHES NOMINAL LEFT INTERNAL (INCLUDES THRU THREAD) IN
THREAD DIRECTIONRIGHT-HAND LEFT INTERNAL (INCLUDES THRU THREAD)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
25502Interchangeable
interchangeable cross-reference
interchangeable
7-551685Interchangeable
interchangeable cross-reference
interchangeable
AB0070551685Interchangeable
interchangeable cross-reference
interchangeable
7804200Interchangeable
interchangeable cross-reference
interchangeable
25502-1Interchangeable
interchangeable cross-reference
interchangeable
25780Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3174AS4621?
3174AS4621 is a STANDOFF,THREADED,SPACING.
What parts can replace 3174AS4621?
There are 11 known substitutes for 3174AS4621: 25502, 7-551685, AB0070551685 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3174AS4621?
3174AS4621 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-424-2997. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026