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40-28-2 — Technical Data Sheet

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Sandberg · 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

A Sandberg Design Cover effectively protects your phone against marks and scratches while also giving it a more personal look. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 5310-00-291-5944, 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
40-28-2
NSN: 5310-00-291-5944
FSC: 5310
CAGE: 95201 — NAPCO INTERNATIONAL LLC DBA NAPCO INTERNATIONAL INC (USA)
SPECIFICATIONS
Part Number40-28-2
ManufacturerSandberg
NSN5310-00-291-5944
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 40-28-2 · Sandberg ⚠ 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
•
OVERALL DIAMETER: 1.375 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MATERIAL: WOOL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.750 INCHES NOMINAL IN
•
THICKNESS: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.375 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MATERIALWOOL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.750 INCHES NOMINAL IN
THICKNESS0.312 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
A391F001InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A40-28-2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A391F001WCAInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SM-B-764969InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
N14B-10InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
501579InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40-28-2?
40-28-2 is a CONNECTOR,RECEPTACLE,ELECTRICAL manufactured by Sandberg.
What parts can replace 40-28-2?
There are 10 known substitutes for 40-28-2: A391F001, A40-28-2, A391F001WCA and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40-28-2?
40-28-2 is cataloged in the Federal Logistics Information System under NSN 5310-00-291-5944. 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: October 2026