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PartsTable / COMPONENT / MP-189-A
MP-189-A ✓ 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,GROOVED,HEADED is a the manufacturer industrial component. Key specifications include height: 0.284 INCHES NOMINAL IN, diameter: 0.500 INCHES NOMINAL IN, material: STEEL COMP 1144 OVERALL, head_style: FLAT CHAMFER, undercut_width: 0.091 INCHES NOMINAL IN, first_end_style: CHAMFERED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-127-1039, 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
MP-189-A
NSN: 5315-01-127-1039
FSC: 5315
CAGE: 44185 — TLD WOLLARD LLC (USA)
SPECIFICATIONS
height0.284 INCHES NOMINAL IN
diameter0.500 INCHES NOMINAL IN
materialSTEEL COMP 1144 OVERALL
head_styleFLAT CHAMFER
undercut_width0.091 INCHES NOMINAL IN
first_end_styleCHAMFERED
style_designatorGROOVE
pin_head_diameter0.500 INCHES NOMINAL IN
under_head_length2.187 INCHES NOMINAL IN
undercut_diameter0.380 INCHES NOMINAL IN
NSN5315-01-127-1039
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MP-189-A · 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 STYLE: CHAMFERED
•
UNDER HEAD LENGTH: 2.187 INCHES NOMINAL IN
•
HEIGHT: 0.284 INCHES NOMINAL IN
•
PIN HEAD DIAMETER: 0.500 INCHES NOMINAL IN
•
STYLE DESIGNATOR: GROOVE
•
MATERIAL: STEEL COMP 1144 OVERALL
•
UNDERCUT DIAMETER: 0.380 INCHES NOMINAL IN
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END STYLECHAMFERED
UNDER HEAD LENGTH2.187 INCHES NOMINAL IN
HEIGHT0.284 INCHES NOMINAL IN
PIN HEAD DIAMETER0.500 INCHES NOMINAL IN
STYLE DESIGNATORGROOVE
MATERIALSTEEL COMP 1144 OVERALL
UNDERCUT DIAMETER0.380 INCHES NOMINAL IN
HEAD STYLEFLAT CHAMFER
UNDERCUT WIDTH0.091 INCHES NOMINAL IN
DIAMETER0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
GE-3P46Interchangeable
interchangeable cross-reference
interchangeable
EP3P46Interchangeable
interchangeable cross-reference
interchangeable
51743Interchangeable
interchangeable cross-reference
interchangeable
29-21046Interchangeable
interchangeable cross-reference
interchangeable
CH176Interchangeable
interchangeable cross-reference
interchangeable
W08-2074B-13MS-33764-15REVFInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MP-189-A?
MP-189-A is a PIN,GROOVED,HEADED.
What parts can replace MP-189-A?
There are 9 known substitutes for MP-189-A: GE-3P46, EP3P46, 51743 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MP-189-A?
MP-189-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-127-1039. 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