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PartsTable / COMPONENT / G21-2
G21-2 ✓ 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

The CRYSTAL UNIT,QUARTZ is a the manufacturer industrial component. Key specifications include material: GLASS COVER HOLDER, body_length: 0.530 INCHES MAXIMUM IN, design_type: DOUBLE END, hole_diameter: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, overall_width: 0.435 INCHES MAXIMUM IN, overall_length: 0.780 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-663-6418, 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
G21-2
NSN: 5330-00-663-6418
FSC: 5330
CAGE: 11757 — PARKER HANNIFIN CORPORATION DIV CHELSEA PRODUCTS DIVISION (USA)
SPECIFICATIONS
materialGLASS COVER HOLDER
body_length0.530 INCHES MAXIMUM IN
design_typeDOUBLE END
hole_diameter0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width0.435 INCHES MAXIMUM IN
overall_length0.780 INCHES MAXIMUM IN
terminal_length0.223 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
outside_diameter6.000 INCHES NOMINAL IN
special_featuresWEIGHT: 0.13 LBS LBS
style_designatorROUND BODY, FERRULE TERMINALS
aperture_diameter4.375 INCHES NOMINAL IN
circuit_resonanceSERIES RESONANCE
NSN5330-00-663-6418
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: G21-2 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
•
APERTURE DIAMETER: 4.375 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
MATERIAL: PAPER AND GLUE AND GLYCERIN OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.031 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 6.000 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: HH-P-96 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: CIRCULAR
•
BOLT HOLE QUANTITY: 6
TECHNICAL CHARACTERISTICS (FLIS)
APERTURE DIAMETER4.375 INCHES NOMINAL IN
HOLE DIAMETER0.406 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
MATERIALPAPER AND GLUE AND GLYCERIN OVERALL
CROSS-SECTIONAL THICKNESS0.031 INCHES NOMINAL IN
OUTSIDE DIAMETER6.000 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONHH-P-96 FED SPEC ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORCIRCULAR
BOLT HOLE QUANTITY6
BOLT CIRCLE DIAMETER5.125 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLESOLID SINGLE OR COMPOSITION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
GGG-D-296Interchangeable
interchangeable cross-reference
interchangeable
31213Interchangeable
interchangeable cross-reference
interchangeable
1195Interchangeable
interchangeable cross-reference
interchangeable
50214873Interchangeable
interchangeable cross-reference
interchangeable
37XSJ7215Interchangeable
interchangeable cross-reference
interchangeable
23361Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is G21-2?
G21-2 is a CRYSTAL UNIT,QUARTZ.
What parts can replace G21-2?
There are 13 known substitutes for G21-2: GGG-D-296, 31213, 1195 and 10 more. Substitute compatibility should be verified for your specific system.
Is G21-2 still available?
G21-2 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