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Technical Data Sheet
PartsTable / COMPONENT / MS16556-866
MS16556-866 ✓ 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,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, first_end_style: CHAMFERED, hardness_rating: 60.0 ROCKWELL C MINIMUM OVERALL, second_end_style: RADIUS, special_features: RADIUS END MAY BE CHAMFERED 0.047 IN. MIN 0.125 IN.

MAX,20 DEGREES MIN 30 DEGREES MAX IN, pin_overall_length: 2.740 INCHES MINIMUM AND 2.760 INCHES MAXIMUM IN. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-145-5576, 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
MS16556-866
NSN: 5315-01-145-5576
FSC: 5315
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
first_end_styleCHAMFERED
hardness_rating60.0 ROCKWELL C MINIMUM OVERALL
second_end_styleRADIUS
special_featuresRADIUS END MAY BE CHAMFERED 0.047 IN. MIN 0.125 IN. MAX,20 DEGREES MIN 30 DEGREES MAX IN
surface_treatmentCADMIUM AND CHROMATE OR CADMIUM OR TIN OR ZINC OR CADMIUM AND PHOSPHATE OR TIN AND CHROMATE OR ZINC AND CHROMATE OR TIN AND PHOSPHATE OR ZINC AND PHOSPHATE OVERALL
pin_overall_length2.740 INCHES MINIMUM AND 2.760 INCHES MAXIMUM IN
pin_overall_diameter0.3759 INCHES MINIMUM AND 0.3761 INCHES MAXIMUM IN
first_end_taper_angle4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
first_end_taper_length0.601 INCHES NOMINAL IN
second_end_corner_radius0.047 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-01-145-5576
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MS16556-866 · 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
•
FIRST END TAPER LENGTH: 0.601 INCHES NOMINAL IN
•
PIN OVERALL DIAMETER: 0.3759 INCHES MINIMUM AND 0.3761 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OR CADMIUM OR TIN OR ZINC OR CADMIUM AND PHOSPHATE OR TIN AND CHROMATE OR ZINC AND CHROMATE OR TIN AND PHOSPHATE OR ZINC AND PHOSPHATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-C-81562 MIL SPEC ALL TREATMENT RESPONSES OVERALL
•
FIRST END TAPER ANGLE: 4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
•
HARDNESS RATING: 60.0 ROCKWELL C MINIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END TAPER LENGTH0.601 INCHES NOMINAL IN
PIN OVERALL DIAMETER0.3759 INCHES MINIMUM AND 0.3761 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM AND CHROMATE OR CADMIUM OR TIN OR ZINC OR CADMIUM AND PHOSPHATE OR TIN AND CHROMATE OR ZINC AND CHROMATE OR TIN AND PHOSPHATE OR ZINC AND PHOSPHATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR MIL-C-81562 MIL SPEC ALL TREATMENT RESPONSES OVERALL
FIRST END TAPER ANGLE4.0 DEGREES MINIMUM AND 16.0 DEGREES MAXIMUM
HARDNESS RATING60.0 ROCKWELL C MINIMUM OVERALL
SPECIAL FEATURESRADIUS END MAY BE CHAMFERED 0.047 IN. MIN 0.125 IN. MAX,20 DEGREES MIN 30 DEGREES MAX IN
SECOND END STYLERADIUS
PIN OVERALL LENGTH2.740 INCHES MINIMUM AND 2.760 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
16361Interchangeable
interchangeable cross-reference
interchangeable
A18238PART16361Interchangeable
interchangeable cross-reference
interchangeable
27A19X305C3Interchangeable
interchangeable cross-reference
interchangeable
627200C91Interchangeable
interchangeable cross-reference
interchangeable
627605C91Interchangeable
interchangeable cross-reference
interchangeable
321697R92Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS16556-866?
MS16556-866 is a PIN,STRAIGHT,HEADLESS.
What parts can replace MS16556-866?
There are 8 known substitutes for MS16556-866: 16361, A18238PART16361, 27A19X305C3 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS16556-866?
MS16556-866 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-145-5576. 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