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PK121 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

RETAINER,HELICAL COMPRESSION SPR. Key specifications include height: 0.938 INCHES NOMINAL IN, cut_type: DIAGONAL INTERMEDIATE RING, material: ASBESTOS AND GRAPHITE INTERMEDIATE RING, joint_type: SCARF-PERIPHERAL TOP RING, inside_diameter: 0.750 INCHES NOMINAL IN, outside_diameter: 1.125 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-362-8456, 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
PK121
NSN: 5330-00-362-8456
FSC: 5330
CAGE: 76255 — MCQUAY-NORRIS INC OEM DIV AN SKF INDUSTRIES CO
SPECIFICATIONS
height0.938 INCHES NOMINAL IN
cut_typeDIAGONAL INTERMEDIATE RING
materialASBESTOS AND GRAPHITE INTERMEDIATE RING
joint_typeSCARF-PERIPHERAL TOP RING
inside_diameter0.750 INCHES NOMINAL IN
outside_diameter1.125 INCHES NOMINAL IN
intermediate_ring_quantity3
cross-sectional_shape_styleANGLE BOTTOM RING
NSN5330-00-362-8456
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: PK121 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
•
MATERIAL: ASBESTOS AND GRAPHITE BOTTOM RING
•
INSIDE DIAMETER: 0.750 INCHES NOMINAL IN
•
HEIGHT: 0.938 INCHES NOMINAL IN
•
INTERMEDIATE RING QUANTITY: 3
•
OUTSIDE DIAMETER: 1.125 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: ANGLE BOTTOM RING
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALASBESTOS AND GRAPHITE BOTTOM RING
INSIDE DIAMETER0.750 INCHES NOMINAL IN
HEIGHT0.938 INCHES NOMINAL IN
INTERMEDIATE RING QUANTITY3
MATERIALASBESTOS AND GRAPHITE INTERMEDIATE RING
OUTSIDE DIAMETER1.125 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEANGLE BOTTOM RING
MATERIALASBESTOS AND GRAPHITE TOP RING
CROSS-SECTIONAL SHAPE STYLEANGLE TOP RING
CROSS-SECTIONAL SHAPE STYLESQUARE/RECTANGULAR INTERMEDIATE RING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
PK121Interchangeable
interchangeable cross-reference
interchangeable
3-19PK121-259Interchangeable
interchangeable cross-reference
interchangeable
69658C1Interchangeable
interchangeable cross-reference
interchangeable
1-87175-3Interchangeable
interchangeable cross-reference
interchangeable
C7416Interchangeable
interchangeable cross-reference
interchangeable
239Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is PK121?
PK121 is a RETAINER,HELICAL COMPRESSION SPR.
What parts can replace PK121?
There are 8 known substitutes for PK121: PK121, 3-19PK121-259, 69658C1 and 5 more. Substitute compatibility should be verified for your specific system.
Is PK121 still available?
PK121 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026