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Technical Data Sheet
PartsTable / COMPONENT / 70-4577
70-4577 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,SQUARE NECK is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, head_style: BUTTON, neck_width: 0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, head_height: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN, neck_length: 0.141 INCHES NOMINAL IN, thread_class: 2A A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-216-1125, 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
70-4577
NSN: 5306-00-216-1125
FSC: 5306
CAGE: 30554 — DEPARTMENT OF DEFENSE PROJECT MANAGER-MOBILE ELECTRIC POWER (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
head_styleBUTTON
neck_width0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
head_height0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
neck_length0.141 INCHES NOMINAL IN
thread_class2A A
head_diameter0.578 INCHES NOMINAL IN
thread_length0.750 INCHES MINIMUM IN
fastener_length1.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
nominal_thread_diameter0.250 INCHES IN
NSN5306-00-216-1125
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 70-4577 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD STYLE: BUTTON
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: COPPER ALLOY OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD CLASS: 2A A
•
NECK LENGTH: 0.141 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.578 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD STYLEBUTTON
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALCOPPER ALLOY OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD CLASS2A A
NECK LENGTH0.141 INCHES NOMINAL IN
HEAD DIAMETER0.578 INCHES NOMINAL IN
HEAD HEIGHT0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
NECK WIDTH0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
THREAD LENGTH0.750 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
6477-32Interchangeable
interchangeable cross-reference
interchangeable
50055Interchangeable
interchangeable cross-reference
interchangeable
S1616Interchangeable
interchangeable cross-reference
interchangeable
1-4-20X1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 70-4577?
70-4577 is a BOLT,SQUARE NECK.
What parts can replace 70-4577?
There are 4 known substitutes for 70-4577: 6477-32, 50055, S1616 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 70-4577?
70-4577 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-216-1125. 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