PartsTable
Technical Data Sheet
Download PDF

1809521 — O-RING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1809521: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR, center_hole_diameter: 2.040 INCHES MINIMUM AND 2.060 INCHES MAXIMUM IN, cross-sectional_height: 0.065 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-172-6937, 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
1809521
NSN: 5315-00-172-6937
NIINs: 001726937, 006843311
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 71791 — CURTISS-WRIGHT CONTROLS, INC. DBA CURTISS WRIGHT DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR
center_hole_diameter2.040 INCHES MINIMUM AND 2.060 INCHES MAXIMUM IN
cross-sectional_height0.065 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
NSN5315-00-172-6937
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1809521 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SURFACE FINISH: 16.0 MICROINCHES SHANK END
•
CHAMFER LENGTH: 0.020 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-8837 TYPE 2 CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
UNDER HEAD LENGTH: 1.025 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
•
PIN CHAMFER ANGLE: 45.0 DEGREES NOMINAL
•
HARDNESS RATING: 54.0 ROCKWELL C MINIMUM AND 56.0 ROCKWELL C MAXIMUM OVERALL
•
CRITICALITY CODE JUSTIFICATION: ABMZ
•
STYLE DESIGNATOR: STRAIGHT
TECHNICAL CHARACTERISTICS
SURFACE FINISH16.0 MICROINCHES SHANK END
CHAMFER LENGTH0.020 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-8837 TYPE 2 CLASS 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
UNDER HEAD LENGTH1.025 INCHES MINIMUM AND 1.030 INCHES MAXIMUM IN
PIN CHAMFER ANGLE45.0 DEGREES NOMINAL
HARDNESS RATING54.0 ROCKWELL C MINIMUM AND 56.0 ROCKWELL C MAXIMUM OVERALL
CRITICALITY CODE JUSTIFICATIONABMZ
STYLE DESIGNATORSTRAIGHT
MATERIAL DOCUMENT AND CLASSIFICATIONCPS4907 FSCM 71791 MFR REF SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.3721 INCHES MINIMUM AND 0.3724 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
Ready to buy 1809521?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 1809521?
1809521 is a O-RING.
What is the NSN for 1809521?
1809521 is cataloged in the U.S. Government catalog under NSN 5315-00-172-6937. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 1809521

✓ 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.