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Technical Data Sheet
ST9M454-4-3 ✓ 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 BOLT ASSEMBLY,CLAMP is a the manufacturer industrial component. Key specifications include material: UNABLE TO DECODE, thread_class: 3A A, thread_length: 1.875 INCHES NOMINAL IN, mounting_method: PIN(S), style_designator: KNURLED NO. 2, thread_direction: RIGHT-HAND.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-393-4078, 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
ST9M454-4-3
NSN: 5340-00-393-4078
FSC: 5340
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialUNABLE TO DECODE
thread_class3A A
thread_length1.875 INCHES NOMINAL IN
mounting_methodPIN(S)
style_designatorKNURLED NO. 2
thread_directionRIGHT-HAND
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch28
thread_series_designatorUNF
NSN5340-00-393-4078
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST9M454-4-3 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 DIRECTION: RIGHT-HAND
MATERIAL: UNABLE TO DECODE
MOUNTING METHOD: PIN(S)
THREAD SERIES DESIGNATOR: UNF
NOMINAL THREAD SIZE: 0.250 INCHES IN
THREAD QUANTITY PER INCH: 28
THREAD CLASS: 3A A
STYLE DESIGNATOR: KNURLED NO. 2
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
MATERIALUNABLE TO DECODE
MOUNTING METHODPIN(S)
THREAD SERIES DESIGNATORUNF
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD QUANTITY PER INCH28
THREAD CLASS3A A
STYLE DESIGNATORKNURLED NO. 2
THREAD LENGTH1.875 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
MIL-F-85731/1Upgraded Successor
successor cross-reference
successor
M85731/1-12Upgraded Successor
successor cross-reference
successor
50-20222Interchangeable
interchangeable cross-reference
interchangeable
64A92C817Interchangeable
interchangeable cross-reference
interchangeable
500018Interchangeable
interchangeable cross-reference
interchangeable
0500-0018Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST9M454-4-3?
ST9M454-4-3 is a BOLT ASSEMBLY,CLAMP.
What parts can replace ST9M454-4-3?
There are 10 known substitutes for ST9M454-4-3: MIL-F-85731/1, M85731/1-12, 50-20222 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST9M454-4-3?
ST9M454-4-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-393-4078. This indicates validated use in U.S. government and defense supply chains.
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