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PartsTable / COMPONENT / 31S0780187
31S0780187 ✓ 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: 0.078 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, overall_length: 0.172 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN, hardness_rating: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL, style_designator: SLOTTED, material_thickness: 0.018 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-291-4423, 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
31S0780187
NSN: 5315-00-291-4423
FSC: 5315
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
diameter0.078 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
overall_length0.172 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSLOTTED
material_thickness0.018 INCHES NOMINAL IN
nondefinitive_spec/std_data1 TYPE AND B COMPOSITION
NSN5315-00-291-4423
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 31S0780187 · 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
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL THICKNESS: 0.018 INCHES NOMINAL IN
•
DIAMETER: 0.078 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SLOTTED
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND B COMPOSITION
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH0.172 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL THICKNESS0.018 INCHES NOMINAL IN
DIAMETER0.078 INCHES NOMINAL IN
STYLE DESIGNATORSLOTTED
NONDEFINITIVE SPEC/STD DATA1 TYPE AND B COMPOSITION
MATERIALSTEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
MIL-P-10971Interchangeable
interchangeable cross-reference
interchangeable
79-048-250-1875Interchangeable
interchangeable cross-reference
interchangeable
NAS561C8-30Interchangeable
interchangeable cross-reference
interchangeable
BA98203-19Interchangeable
interchangeable cross-reference
interchangeable
NASM10971CLASSBInterchangeable
interchangeable cross-reference
interchangeable
22-15049A48Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31S0780187?
31S0780187 is a PIN,SPRING.
What parts can replace 31S0780187?
There are 21 known substitutes for 31S0780187: MIL-P-10971, 79-048-250-1875, NAS561C8-30 and 18 more. Substitute compatibility should be verified for your specific system.
Is 31S0780187 still available?
31S0780187 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