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ST9M558D18 — STRAP,RETAINING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ST9M558D18: STRAP,RETAINING.

The STRAP,RETAINING is a the manufacturer industrial component. Key specifications include cushion: INCLUDED, material: ALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED, mounting_pad: NOT INCLUDED, overall_width: 0.750 INCHES NOMINAL IN, overall_length: 2.565 INCHES NOMINAL IN, style_designator: SADDLE ARCH. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-130-8699, 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
ST9M558D18
NSN: 5340-01-130-8699
FSC: 5340 — Hardware, Commercial
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
cushionINCLUDED
materialALUMINUM ALLOY 2024 AND ALUMINUM ALLOY 1230 LOCATION NOT OTHERWISE SPECIFIED
mounting_padNOT INCLUDED
overall_width0.750 INCHES NOMINAL IN
overall_length2.565 INCHES NOMINAL IN
style_designatorSADDLE ARCH
surface_treatmentALUMINUM
material_thickness0.051 INCHES NOMINAL IN
mounting_hole_size0.197 INCHES NOMINAL IN
end_item_identificationAIRCRAFT, HORNET F/A-18; AIRCRAFT, EAGLE F-15; F/A-18E/F HORNET AIRCRAFT
inside_diameter/arch_length1.110 INCHES MINIMUM AND 1.140 INCHES MAXIMUM IN
material_document_and_classificationAMS 3209 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
NSN5340-01-130-8699
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST9M558D18 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
•
MOUNTING HOLE SIZE: 0.197 INCHES NOMINAL IN
•
DISTANCE BETWEEN MOUNTING HOLE CENTERS: 2.050 INCHES MINIMUM AND 2.080 INCHES MAXIMUM IN
•
MOUNTING PAD: NOT INCLUDED
•
STYLE DESIGNATOR: SADDLE ARCH
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 3209 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
•
MATERIAL THICKNESS: 0.051 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
MOUNTING HOLE SIZE0.197 INCHES NOMINAL IN
DISTANCE BETWEEN MOUNTING HOLE CENTERS2.050 INCHES MINIMUM AND 2.080 INCHES MAXIMUM IN
MOUNTING PADNOT INCLUDED
STYLE DESIGNATORSADDLE ARCH
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 3209 ASSN STD SINGLE MATERIAL RESPONSE CUSHIONING
OVERALL LENGTH2.565 INCHES NOMINAL IN
OVERALL WIDTH0.750 INCHES NOMINAL IN
MATERIAL THICKNESS0.051 INCHES NOMINAL IN
CUSHIONINCLUDED
DISTANCE BETWEEN BASE AND INSIDE OF ARCH1.227 INCHES NOMINAL 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 3
1399D18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10112571Reference document
Same NSN cross-reference
Reference document — Informative reference only
TA09C89D18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST9M558D18?
ST9M558D18 is a STRAP,RETAINING.
What parts can replace ST9M558D18?
There are 3 known substitutes for ST9M558D18: 1399D18, 10112571, TA09C89D18. Substitute compatibility should be verified for your specific system.
What is the NSN for ST9M558D18?
ST9M558D18 is cataloged in the U.S. Government catalog under NSN 5340-01-130-8699. 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.