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1691C — GASKET

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1691C: GASKET.

The GASKET is a the manufacturer industrial component. Key specifications include material: PAPER OVERALL, hole_diameter: 0.340 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 2.810 INCHES NOMINAL IN, overall_length: 2.810 INCHES NOMINAL IN, style_designator: NON-CIRCULAR, aperture_diameter: 1.810 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-641-7161, 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
1691C
NSN: 5330-00-641-7161
FSC: 5330 — Packing and Gasket Materials
CAGE: 80254 — TEXTRON LYCOMING INC WILLIAMSPORT PLANT (USA)
SPECIFICATIONS
materialPAPER OVERALL
hole_diameter0.340 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width2.810 INCHES NOMINAL IN
overall_length2.810 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
aperture_diameter1.810 INCHES NOMINAL IN
bolt_hole_quantity4
outside_corner_radius0.440 INCHES NOMINAL IN
cross-sectional_thickness0.005 INCHES MINIMUM AND 0.009 INCHES MAXIMUM IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
outside_edge_to_bolt_hole_center_distance_along_width0.405 INCHES NOMINAL IN
outside_edge_to_bolt_hole_center_distance_along_length0.405 INCHES NOMINAL IN
NSN5330-00-641-7161
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1691C 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 THICKNESS: 0.005 INCHES MINIMUM AND 0.009 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: NON-CIRCULAR
•
CROSS-SECTIONAL SHAPE STYLE: SOLID SINGLE OR COMPOSITION
•
APERTURE DIAMETER: 1.810 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 4
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH: 2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL THICKNESS0.005 INCHES MINIMUM AND 0.009 INCHES MAXIMUM IN
STYLE DESIGNATORNON-CIRCULAR
OVERALL LENGTH2.810 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
OVERALL WIDTH2.810 INCHES NOMINAL IN
APERTURE DIAMETER1.810 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
OUTSIDE EDGE TO BOLT HOLE CENTER DISTANCE ALONG LENGTH0.405 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1691C?
1691C is a GASKET.
What is the NSN for 1691C?
1691C is cataloged in the U.S. Government catalog under NSN 5330-00-641-7161. 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.