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55A1-12 — GASKET,SPIRAL WOUND

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

55A1-12: GASKET,SPIRAL WOUND.

The GASKET,SPIRAL WOUND is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 6061 AND RUBBER CHLOROPRENE CLASS CR OVERALL, hole_diameter: 0.205 INCHES NOMINAL0.205 INCHES NOMINAL IN, overall_width: 2.071 INCHES NOMINAL2.071 INCHES NOMINAL IN, style_designator: NON-CIRCULAR, aperture_diameter: 0.669 INCHES NOMINAL0.669 INCHES NOMINAL IN, surface_treatment: ASBESTOS OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-589-3591, 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
55A1-12
NSN: 5330-00-589-3591
FSC: 5330 — Packing and Gasket Materials
CAGE: 38597 — LOCKHEED MARTIN CORPORATION DIV ROTARY AND MISSION SYSTEMS (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 6061 AND RUBBER CHLOROPRENE CLASS CR OVERALL
hole_diameter0.205 INCHES NOMINAL0.205 INCHES NOMINAL IN
overall_width2.071 INCHES NOMINAL2.071 INCHES NOMINAL IN
style_designatorNON-CIRCULAR
aperture_diameter0.669 INCHES NOMINAL0.669 INCHES NOMINAL IN
surface_treatmentASBESTOS OVERALL
bolt_hole_quantity44
gage_ring_thickness0.080 INCHES NOMINAL0.080 INCHES NOMINAL IN
bolt_circle_diameter1.635 INCHES NOMINAL1.635 INCHES NOMINAL IN
outside_corner_radius0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN
cross-sectional_thickness0.120 INCHES NOMINAL0.120 INCHES NOMINAL IN
cross-sectional_shape_styleMETAL WINDING W/ SOFT FILLERMETAL WINDING W/ SOFT FILLER
NSN5330-00-589-3591
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 55A1-12 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TY 2,CL CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.120 INCHES NOMINAL0.120 INCHES NOMINAL IN
•
GAGE RING THICKNESS: 0.080 INCHES NOMINAL0.080 INCHES NOMINAL IN
•
SIDE RADIUS FROM GASKET CENTER: 0.625 INCHES NOMINAL0.625 INCHES NOMINAL IN
•
STYLE DESIGNATOR: NON-CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-250/11,T6 FED SPEC SINGLE MATERIAL RESPONSE AND MIL-R-6855,CL 1,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: METAL WINDING W/ SOFT FILLERMETAL WINDING W/ SOFT FILLER
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TY 2,CL CL 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CROSS-SECTIONAL THICKNESS0.120 INCHES NOMINAL0.120 INCHES NOMINAL IN
GAGE RING THICKNESS0.080 INCHES NOMINAL0.080 INCHES NOMINAL IN
SIDE RADIUS FROM GASKET CENTER0.625 INCHES NOMINAL0.625 INCHES NOMINAL IN
STYLE DESIGNATORNON-CIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/11,T6 FED SPEC SINGLE MATERIAL RESPONSE AND MIL-R-6855,CL 1,GR 60 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLEMETAL WINDING W/ SOFT FILLERMETAL WINDING W/ SOFT FILLER
OVERALL WIDTH2.071 INCHES NOMINAL2.071 INCHES NOMINAL IN
OUTSIDE CORNER INVERTED RADIUS0.218 INCHES NOMINAL0.218 INCHES NOMINAL IN
APERTURE DIAMETER0.669 INCHES NOMINAL0.669 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 2
4385-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
PE550000001-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 55A1-12?
55A1-12 is a GASKET,SPIRAL WOUND.
What parts can replace 55A1-12?
There are 2 known substitutes for 55A1-12: 4385-12, PE550000001-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 55A1-12?
55A1-12 is cataloged in the U.S. Government catalog under NSN 5330-00-589-3591. 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.