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 5/8 STD LOCK is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-937-0453, 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.
MATERIAL: STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 385 OR STEEL COMP 384 OVERALL
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SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
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HARDNESS RATING: 35.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
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SURFACE TREATMENT: PASSIVATE OVERALL
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HOLE DIAMETER: 0.636 INCHES MINIMUM AND 0.653 INCHES MAXIMUM IN
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MATERIAL THICKNESS: 0.156 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
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OUTSIDE DIAMETER: 1.079 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL
STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 385 OR STEEL COMP 384 OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION
QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
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FREQUENTLY ASKED QUESTIONS
What is 5/8 STD LOCK?
5/8 STD LOCK is a 5/8 STD LOCK.
What parts can replace 5/8 STD LOCK?
There are 14 known substitutes for 5/8 STD LOCK: 98228, 164-17, 98228ADX and 11 more. Substitute compatibility should be verified for your specific system.
Is 5/8 STD LOCK still available?
5/8 STD LOCK is currently cancelled.
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