PartsTable
Technical Data Sheet
FSC/MD-25 ✓ 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 FSC/MD-25 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-185-8497, 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
FSC/MD-25
NSN: 5310-01-185-8497
FSC: 5310
CAGE: 04967 — FASTENER SPECIALTY, INC. (USA)
SPECIFICATIONS
Part NumberFSC/MD-25
NSN5310-01-185-8497
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: FSC/MD-25 · 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
LUBRICATION: DRY FILM LUBRICANT
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-N-45938 MIL SPEC 2ND MATERIAL RESPONSE NUT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-5541 MIL SPEC 1ST TREATMENT RESPONSE OVERALL EXCEPT INSERT
SURFACE TREATMENT: CADMIUM NUT
MATERIAL: ALUMINUM ALLOY 6061 OVERALL EXCEPT INSERT
TECHNICAL CHARACTERISTICS (FLIS)
LUBRICATIONDRY FILM LUBRICANT
SPECIAL FEATURESONE CENTRALLY LOCATED RD HOLE 1.658 IN. MIN DIA AND 1.673 IN. MAX DIA; FOUR CLINCH NUTS MOUNTED ON 1.497 IN. MIN X 1.503 IN. MAX MOUNTING CENTERS; NUTS EXTEND FOR A TOTAL THK OF 0.123 IN. MIN,0.183 IN. MAX; FOUR CORNERS 0.090 IN. NOM RADIUS; CLINCH NUTS ARE SELFLOCKING TYPE IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-N-45938 MIL SPEC 2ND MATERIAL RESPONSE NUT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-5541 MIL SPEC 1ST TREATMENT RESPONSE OVERALL EXCEPT INSERT
SURFACE TREATMENTCADMIUM NUT
MATERIALALUMINUM ALLOY 6061 OVERALL EXCEPT INSERT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-N-45938 MIL SPEC 2ND TREATMENT RESPONSE NUT
MATERIALSTEEL NUT
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/11 FED SPEC 1ST MATERIAL RESPONSE OVERALL EXCEPT INSERT
SURFACE TREATMENTCHROMATE OVERALL EXCEPT INSERT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
100925Interchangeable
interchangeable cross-reference
interchangeable
7124Interchangeable
interchangeable cross-reference
interchangeable
A43Interchangeable
interchangeable cross-reference
interchangeable
18E9Interchangeable
interchangeable cross-reference
interchangeable
12L-18518-48GInterchangeable
interchangeable cross-reference
interchangeable
EFJ-43Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FSC/MD-25?
FSC/MD-25 is a FSC/MD-25.
What parts can replace FSC/MD-25?
There are 11 known substitutes for FSC/MD-25: 100925, 7124, A43 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FSC/MD-25?
FSC/MD-25 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-185-8497. This indicates validated use in U.S. government and defense supply chains.
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