PartsTable
Technical Data Sheet
21-0018 ✓ 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 RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, lens_color: AMBER, design_type: SINGLE FACE, adjustability: NONADJUSTABLE, overall_depth: 1.437 INCHES NOMINAL IN, overall_width: 2.000 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-00-138-4440, 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
21-0018
NSN: 5331-00-138-4440
FSC: 5331 — O-RING
CAGE: 26136 — KEARFLEX ENGINEERING COMPANY (USA)
SPECIFICATIONS
materialCOPPER ALLOY
lens_colorAMBER
design_typeSINGLE FACE
adjustabilityNONADJUSTABLE
overall_depth1.437 INCHES NOMINAL IN
overall_width2.000 INCHES NOMINAL IN
vial_quantity1 BUBBLE
overall_length5.000 INCHES NOMINAL IN
hardness_rating70.0 SHORE DUROMETER A NOMINAL
outside_diameter0.865 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
special_features45 MINUTES PER 0.1 IN. MOVEMENT OF BUBBLE SENSITIVITY; THREE 0.070 IN. DIA MTG HOLES ON 0.883 IN. DIA BOLT CIRCLE; CHROME PLATED BRASS HOUSING IN
center_hole_diameter0.669 INCHES MINIMUM AND 0.679 INCHES MAXIMUM IN
NSN5331-00-138-4440
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21-0018 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
CENTER HOLE DIAMETER: 0.669 INCHES MINIMUM AND 0.679 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
MATERIAL: RUBBER SILICONE CLASS Q
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE: 125 MAXIMUM
OUTSIDE DIAMETER: 0.865 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE DIAMETER0.669 INCHES MINIMUM AND 0.679 INCHES MAXIMUM IN
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
MATERIALRUBBER SILICONE CLASS Q
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
OUTSIDE DIAMETER0.865 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
211570Interchangeable
interchangeable cross-reference
interchangeable
31433HInterchangeable
interchangeable cross-reference
interchangeable
634303Interchangeable
interchangeable cross-reference
interchangeable
2-10018Interchangeable
interchangeable cross-reference
interchangeable
2051008-01Interchangeable
interchangeable cross-reference
interchangeable
2051028-01Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-0018?
21-0018 is a RELAY,ELECTROMAGNETIC.
What parts can replace 21-0018?
There are 15 known substitutes for 21-0018: 211570, 31433H, 634303 and 12 more. Substitute compatibility should be verified for your specific system.
Is 21-0018 still available?
21-0018 is currently cancelled.
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