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Technical Data Sheet
PartsTable / COMPONENT / S4.4-4
S4.4-4 ✓ 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 S4.4-4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-157-8657, 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
S4.4-4
NSN: 5310-01-157-8657
FSC: 5310
CAGE: 19904 — STROCO MANUFACTURING, INC. DBA STROCO MANUFACTURING INC (USA)
SPECIFICATIONS
Part NumberS4.4-4
NSN5310-01-157-8657
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: S4.4-4 · 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 DOCUMENT AND CLASSIFICATION: QQ-A-250/11,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD CLASS: 3B
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: ALUMINUM ALLOY OVERALL
•
SURFACE TREATMENT: ANODIZE OVERALL
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
•
THREAD SERIES: UNJC
•
THREAD QUANTITY PER INCH: 32
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-250/11,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3B
THREAD DIRECTIONRIGHT-HAND
MATERIALALUMINUM ALLOY OVERALL
SURFACE TREATMENTANODIZE OVERALL
NOMINAL THREAD SIZE0.138 INCHES IN
THREAD SERIESUNJC
THREAD QUANTITY PER INCH32
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2473 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
S368Interchangeable
interchangeable cross-reference
interchangeable
S444Interchangeable
interchangeable cross-reference
interchangeable
S450PC27Interchangeable
interchangeable cross-reference
interchangeable
AN4-44Interchangeable
interchangeable cross-reference
interchangeable
411177-44Interchangeable
interchangeable cross-reference
interchangeable
7901971-009Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S4.4-4?
S4.4-4 is a S4.4-4.
What parts can replace S4.4-4?
There are 12 known substitutes for S4.4-4: S368, S444, S450PC27 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S4.4-4?
S4.4-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-157-8657. 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