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R20957 ✓ 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 LOCKING PLATE,NUT AND BOLT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, ear_width: 0.250 INCHES NOMINAL IN, body_width: 0.375 INCHES NOMINAL IN, inside_height: 0.406 INCHES NOMINAL IN, inside_radius: 0.250 INCHES NOMINAL IN, plate_thickness: 0.067 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-737-2857, 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
R20957
NSN: 5340-00-737-2857
FSC: 5340
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
ear_width0.250 INCHES NOMINAL IN
body_width0.375 INCHES NOMINAL IN
inside_height0.406 INCHES NOMINAL IN
inside_radius0.250 INCHES NOMINAL IN
plate_thickness0.067 INCHES NOMINAL IN
style_designatorSOCKET
mounting_hole_diameter0.406 INCHES NOMINAL IN
angle_between_ears_in_deg90.0
cross-sectional_shape_styleHALF ROUND
distance_between_mounting_hole_centers0.906 INCHES NOMINAL IN
angle_from_horizontal_centerline_to_ear_in_deg90.0
NSN5340-00-737-2857
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: R20957 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
•
DISTANCE BETWEEN MOUNTING HOLE CENTERS: 0.906 INCHES NOMINAL IN
•
BODY WIDTH: 0.375 INCHES NOMINAL IN
•
INSIDE HEIGHT: 0.406 INCHES NOMINAL IN
•
EAR WIDTH: 0.250 INCHES NOMINAL IN
•
ANGLE BETWEEN EARS IN DEG: 90.0
•
MOUNTING HOLE DIAMETER: 0.406 INCHES NOMINAL IN
•
ANGLE FROM HORIZONTAL CENTERLINE TO EAR IN DEG: 90.0
•
INSIDE RADIUS: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DISTANCE BETWEEN MOUNTING HOLE CENTERS0.906 INCHES NOMINAL IN
BODY WIDTH0.375 INCHES NOMINAL IN
INSIDE HEIGHT0.406 INCHES NOMINAL IN
EAR WIDTH0.250 INCHES NOMINAL IN
ANGLE BETWEEN EARS IN DEG90.0
MOUNTING HOLE DIAMETER0.406 INCHES NOMINAL IN
ANGLE FROM HORIZONTAL CENTERLINE TO EAR IN DEG90.0
INSIDE RADIUS0.250 INCHES NOMINAL IN
STYLE DESIGNATORSOCKET
PLATE THICKNESS0.067 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
P103M141Interchangeable
interchangeable cross-reference
interchangeable
P68M6601YInterchangeable
interchangeable cross-reference
interchangeable
16866Interchangeable
interchangeable cross-reference
interchangeable
MS20426B3-12Interchangeable
interchangeable cross-reference
interchangeable
811636Interchangeable
interchangeable cross-reference
interchangeable
AN426B3-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R20957?
R20957 is a LOCKING PLATE,NUT AND BOLT.
What parts can replace R20957?
There are 16 known substitutes for R20957: P103M141, P68M6601Y, 16866 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R20957?
R20957 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-737-2857. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026