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Technical Data Sheet
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938.56.31.106 — Technical Data Sheet

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— · 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 NUT,SHEET SPRING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: SHEET SPRING, nut_width: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN, nut_height: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN, nut_length: 0.661 INCHES MINIMUM AND 0.681 INCHES MAXIMUM IN, panel_thickness: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-928-3878, 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
938.56.31.106
NSN: 5310-00-928-3878
FSC: 5310
CAGE: S4080 — PILATUS AIRCRAFT LTD (CHE)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_styleSHEET SPRING
nut_width0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
nut_height0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
nut_length0.661 INCHES MINIMUM AND 0.681 INCHES MAXIMUM IN
panel_thickness0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
surface_treatmentCADMIUM OR ZINC AND CHROMATE OR ZINC AND PHOSPHATE OVERALL
material_thickness0.002 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
end_item_identificationHELICOPTER, SEAHAWK, H-60;AIRCRAFT, STRATOLIFTER C-135;HELICOPTER, LAMPS MARK III, SH-60B;AIRCRAFT, T-38;AIRCRAFT, HARRIER AV-8B
mating_member_diameter_accommodated0.138 INCHES NOMINAL IN
NSN5310-00-928-3878
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 938.56.31.106 · 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
•
SURFACE TREATMENT: CADMIUM OR ZINC AND CHROMATE OR ZINC AND PHOSPHATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 1,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 3RD TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 4TH TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 5TH TREATMENT RESPONSE OVERALL
•
MATERIAL: COPPER ALLOY OVERALL
•
NUT HEIGHT: 0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
•
PANEL THICKNESS: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
•
NUT WIDTH: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.002 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM OR ZINC AND CHROMATE OR ZINC AND PHOSPHATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 1,CLASS 2 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 2ND TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 3RD TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 4TH TREATMENT RESPONSE OR QQ-Z-325 FED SPEC 5TH TREATMENT RESPONSE OVERALL
MATERIALCOPPER ALLOY OVERALL
NUT HEIGHT0.678 INCHES MINIMUM AND 0.698 INCHES MAXIMUM IN
PANEL THICKNESS0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONHELICOPTER, SEAHAWK, H-60;AIRCRAFT, STRATOLIFTER C-135;HELICOPTER, LAMPS MARK III, SH-60B;AIRCRAFT, T-38;AIRCRAFT, HARRIER AV-8B
NUT WIDTH0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN
MATERIAL THICKNESS0.002 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
MATING MEMBER DIAMETER ACCOMMODATED0.138 INCHES NOMINAL IN
NUT LENGTH0.661 INCHES MINIMUM AND 0.681 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
404185Interchangeable
interchangeable cross-reference
interchangeable
4117Interchangeable
interchangeable cross-reference
interchangeable
76B140Interchangeable
interchangeable cross-reference
interchangeable
21U1141PC4117Interchangeable
interchangeable cross-reference
interchangeable
25312Interchangeable
interchangeable cross-reference
interchangeable
852252Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 938.56.31.106?
938.56.31.106 is a NUT,SHEET SPRING.
What parts can replace 938.56.31.106?
There are 17 known substitutes for 938.56.31.106: 404185, 4117, 76B140 and 14 more. Substitute compatibility should be verified for your specific system.
Is 938.56.31.106 still available?
938.56.31.106 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: August 2026