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Technical Data Sheet
PartsTable / COMPONENT / 661601
661601 ✓ Verified by PartsTable
Legrand · 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 TRANSFORMER,POWER is a Legrand industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: KNURLED NO. 1, head_height: 0.220 INCHES NOMINAL IN, point_style: FLAT, thread_class: 2A A, head_diameter: 0.250 INCHES NOMINAL IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-0043, 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
661601
NSN: 5305-00-018-0043
FSC: 5305
CAGE: 06481 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleKNURLED NO. 1
head_height0.220 INCHES NOMINAL IN
point_styleFLAT
thread_class2A A
head_diameter0.250 INCHES NOMINAL IN
lamp_quantity5
thread_length0.170 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.980 INCHES NOMINAL IN
shoulder_length0.600 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
NSN5305-00-018-0043
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 661601 · Legrand ⚠ 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
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD DIAMETER: 0.250 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 40
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SHOULDER DIAMETER: 0.160 INCHES NOMINAL FIRST SHOULDER IN
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER SHAPEROUND FIRST SHOULDER
THREAD DIRECTIONRIGHT-HAND
HEAD DIAMETER0.250 INCHES NOMINAL IN
THREAD QUANTITY PER INCH40
SURFACE TREATMENTPASSIVATE OVERALL
NOMINAL THREAD DIAMETER0.112 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SHOULDER DIAMETER0.160 INCHES NOMINAL FIRST SHOULDER IN
FASTENER LENGTH0.980 INCHES NOMINAL IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
661601Interchangeable
interchangeable cross-reference
interchangeable
6650-0000-0000Interchangeable
interchangeable cross-reference
interchangeable
FAS-2CInterchangeable
interchangeable cross-reference
interchangeable
134758-0000Interchangeable
interchangeable cross-reference
interchangeable
24085Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 661601?
661601 is a TRANSFORMER,POWER manufactured by Legrand.
What parts can replace 661601?
There are 5 known substitutes for 661601: 661601, 6650-0000-0000, FAS-2C and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 661601?
661601 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-0043. 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