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PartsTable / COMPONENT / 1AB20-2
1AB20-2 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.091 INCHES NOMINAL IN, hole_diameter: 0.641 INCHES NOMINAL IN, overall_diameter: 1.120 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-839-3765, 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
1AB20-2
NSN: 5310-00-839-3765
FSC: 5310
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.091 INCHES NOMINAL IN
hole_diameter0.641 INCHES NOMINAL IN
overall_diameter1.120 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-839-3765
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1AB20-2 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.641 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 1.120 INCHES NOMINAL IN
•
THICKNESS: 0.091 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.641 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER1.120 INCHES NOMINAL IN
THICKNESS0.091 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
S16073Interchangeable
interchangeable cross-reference
interchangeable
SRB305SInterchangeable
interchangeable cross-reference
interchangeable
1B4115Interchangeable
interchangeable cross-reference
interchangeable
6723-00361Interchangeable
interchangeable cross-reference
interchangeable
6723-00419Interchangeable
interchangeable cross-reference
interchangeable
B202Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1AB20-2?
1AB20-2 is a WASHER,FLAT.
What parts can replace 1AB20-2?
There are 9 known substitutes for 1AB20-2: S16073, SRB305S, 1B4115 and 6 more. Substitute compatibility should be verified for your specific system.
Is 1AB20-2 still available?
1AB20-2 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