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1001821 — Technical Data Sheet

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3M · 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 3M industrial component. Key specifications include material: PLASTIC ACRYLIC PANEL, indicator_type: LIGHT LOCATION NOT OTHERWISE SPECIFIED, overall_height: 7.250 INCHES NOMINAL IN, overall_length: 1.120 INCHES NOMINAL IN, special_features: ANVIS COMPATIBLE, special_markings: GAS GEN TACH; PWR TURB TEMP; FUEL FLOW; ENG OIL TEMP. This part is cataloged in the Federal Logistics Information System under NSN 5310-01-352-2753, 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
1001821
NSN: 5310-01-352-2753
FSC: 5310
CAGE: 1EFH8 — GENERAL DYNAMICS LAND SYSTEMS - FORCE PROTECTION INC. DBA GDLS DIV GDLS-FP (USA)
SPECIFICATIONS
materialPLASTIC ACRYLIC PANEL
indicator_typeLIGHT LOCATION NOT OTHERWISE SPECIFIED
overall_height7.250 INCHES NOMINAL IN
overall_length1.120 INCHES NOMINAL IN
special_featuresANVIS COMPATIBLE
special_markingsGAS GEN TACH; PWR TURB TEMP; FUEL FLOW; ENG OIL TEMP
ac_voltage_rating5.0 VOLTS NOMINAL
material_document_and_classificationMIL-P-5425 MIL SPEC SINGLE MATERIAL RESPONSE PANEL
NSN5310-01-352-2753
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1001821 · 3M ⚠ 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
7729378InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
100175-3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
41650-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
8T-4121InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
5310PL2124648InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
11103684InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1001821?
1001821 is a WASHER,FLAT manufactured by 3M.
What parts can replace 1001821?
There are 8 known substitutes for 1001821: 7729378, 100175-3, 41650-1 and 5 more. Substitute compatibility should be verified for your specific system.
Is 1001821 still available?
1001821 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: October 2026