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BM258-1-40 — SEALING WASHER ASSEMBLY

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

BM258-1-40: SEALING WASHER ASSEMBLY.

The SEALING WASHER ASSEMBLY is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: WITH CERAMIC SEAT,OD SIZE 1-1/4 IN,FOR 5/8 IN SHAFT IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-262-6311, 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
BM258-1-40
NSN: 5330-00-262-6311
FSC: 5330 — Packing and Gasket Materials
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
general_characteristics_item_descriptionWITH CERAMIC SEAT,OD SIZE 1-1/4 IN,FOR 5/8 IN SHAFT IN
NSN5330-00-262-6311
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: BM258-1-40 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: WITH CERAMIC SEAT,OD SIZE 1-1/4 IN,FOR 5/8 IN SHAFT IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONWITH CERAMIC SEAT,OD SIZE 1-1/4 IN,FOR 5/8 IN SHAFT IN
SUBSTITUTES & CROSS-REFERENCES 1
PS1000Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BM258-1-40?
BM258-1-40 is a SEALING WASHER ASSEMBLY.
What parts can replace BM258-1-40?
There is 1 known substitute for BM258-1-40: PS1000. Substitute compatibility should be verified for your specific system.
What is the NSN for BM258-1-40?
BM258-1-40 is cataloged in the U.S. Government catalog under NSN 5330-00-262-6311. 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.