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Technical Data Sheet
PartsTable / COMPONENT / M4721
M4721 ✓ 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 LEAD ASSEMBLY,ELECTRICAL is a the manufacturer industrial component. Key specifications include material: RUBBER OVERALL, nominal_width: 50.0 MILLIMETERS MM, outside_length: 1120.0 MILLIMETERS NOMINAL MM, style_designator: POSITIVE DRIVE, nominal_pitch_length: 44.090 INCHES IN, nominal_pitch_distance: 8.0 MILLIMETERS MM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-550-1059, 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
M4721
NSN: 5310-00-550-1059
FSC: 5310
CAGE: A1508 — RHEINMETALL ITALIA SPA (ITA)
SPECIFICATIONS
materialRUBBER OVERALL
nominal_width50.0 MILLIMETERS MM
outside_length1120.0 MILLIMETERS NOMINAL MM
style_designatorPOSITIVE DRIVE
nominal_pitch_length44.090 INCHES IN
nominal_pitch_distance8.0 MILLIMETERS MM
drive_type_and_quantity140 TEETH
end_item_identificationECP AW13191
part_name_assigned_by_controlling_agencyBELT
NSN5310-00-550-1059
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M4721 · 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
•
MATERIAL: COPPER ALLOY OVERALL
•
WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE TYPE: CHAMFERED
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES: UNEF
•
NUT STYLE: HEXAGON
•
NUT HEIGHT: 0.078 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY OVERALL
WIDTH ACROSS FLATS0.312 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPECHAMFERED
THREAD QUANTITY PER INCH32
THREAD SERIESUNEF
NUT STYLEHEXAGON
NUT HEIGHT0.078 INCHES NOMINAL IN
THREAD CLASS2B
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
21770Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/8Interchangeable
interchangeable cross-reference
interchangeable
PA7100Interchangeable
interchangeable cross-reference
interchangeable
SAE-AMS-QQ-A-200/8Interchangeable
interchangeable cross-reference
interchangeable
26051-3Interchangeable
interchangeable cross-reference
interchangeable
99121770Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M4721?
M4721 is a LEAD ASSEMBLY,ELECTRICAL.
What parts can replace M4721?
There are 16 known substitutes for M4721: 21770, AMS-QQ-A-200/8, PA7100 and 13 more. Substitute compatibility should be verified for your specific system.
Is M4721 still available?
M4721 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