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Technical Data Sheet
PartsTable / COMPONENT / 79-040-187-2500
79-040-187-2500 ✓ 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 PIN,SPRING is a the manufacturer industrial component. Key specifications include diameter: 0.187 INCHES NOMINAL IN, material: STEEL OVERALL, overall_length: 2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM IN, hardness_rating: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SLOTTED, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-664-7492, 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
79-040-187-2500
NSN: 5315-00-664-7492
FSC: 5315
CAGE: 72962 — HARVARD INDUSTRIES INC (USA)
SPECIFICATIONS
diameter0.187 INCHES NOMINAL IN
materialSTEEL OVERALL
overall_length2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSLOTTED
surface_treatmentCADMIUM OVERALL
material_thickness0.040 INCHES NOMINAL IN
nondefinitive_spec/std_data1 TYPE AND B COMPOSITION
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5315-00-664-7492
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 79-040-187-2500 · 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
•
DIAMETER: 0.187 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SLOTTED
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND B COMPOSITION
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.187 INCHES NOMINAL IN
STYLE DESIGNATORSLOTTED
OVERALL LENGTH2.475 INCHES MINIMUM AND 2.525 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND B COMPOSITION
MATERIALSTEEL OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
SURFACE TREATMENTCADMIUM OVERALL
MATERIAL THICKNESS0.040 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
MIL-P-10971Interchangeable
interchangeable cross-reference
interchangeable
79-048-250-1875Interchangeable
interchangeable cross-reference
interchangeable
NAS561C8-30Interchangeable
interchangeable cross-reference
interchangeable
79-014-078-0187Interchangeable
interchangeable cross-reference
interchangeable
MILP10971TYPE1C0MP0SITI0NBInterchangeable
interchangeable cross-reference
interchangeable
BA98203-19Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 79-040-187-2500?
79-040-187-2500 is a PIN,SPRING.
What parts can replace 79-040-187-2500?
There are 18 known substitutes for 79-040-187-2500: MIL-P-10971, 79-048-250-1875, NAS561C8-30 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 79-040-187-2500?
79-040-187-2500 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-664-7492. 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