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ST266Z5B — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

ST266Z5B: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE NITRILE, center_hole_diameter: 2.500 INCHES NOMINAL IN, end_item_identification: SIMPLEX STRAINER; LOGISTICS SUPPORT VESSEL. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-076-6164, 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
ST266Z5B
NSN: 5331-01-076-6164
NIINs: 010766164, 012397911, 015993187
FSC: 5331 — O-ring
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialRUBBER BUTADIENE NITRILE
center_hole_diameter2.500 INCHES NOMINAL IN
end_item_identificationSIMPLEX STRAINER; LOGISTICS SUPPORT VESSEL
NSN5331-01-076-6164
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: ST266Z5B 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
•
CROSS-SECTIONAL HEIGHT: 0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 5.074 INCHES MINIMUM AND 5.144 INCHES MAXIMUM IN
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.135 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CENTER HOLE DIAMETER5.074 INCHES MINIMUM AND 5.144 INCHES MAXIMUM IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
SUBSTITUTES & CROSS-REFERENCES 3
AS568-251MIL-G- 1149TY2CL5Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2-251N103-70Reference document
Same NSN cross-reference
Reference document — Secondary reference
AB722-1970-000PReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST266Z5B?
ST266Z5B is a O-RING.
What parts can replace ST266Z5B?
There are 3 known substitutes for ST266Z5B: AS568-251MIL-G- 1149TY2CL5, 2-251N103-70, AB722-1970-000P. Substitute compatibility should be verified for your specific system.
What is the NSN for ST266Z5B?
ST266Z5B is cataloged in the U.S. Government catalog under NSN 5331-01-076-6164. 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.