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Technical Data Sheet
PartsTable / COMPONENT / 51281
51281 ✓ 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

TRANSFORMER,POWER AUTOTRANSFORME. Key specifications include material: STEEL OVERALL, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, body_style: WEBBED, OFFSET, SOLID, body_width: 2.250 INCHES NOMINAL IN, bore_style: PLAIN BOTH ENDS, head_style: FLAT CHAMFER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-286-0520, 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
51281
NSN: 5305-00-286-0520
FSC: 5305
CAGE: 63728 — SEALCRAFT CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
body_styleWEBBED, OFFSET, SOLID
body_width2.250 INCHES NOMINAL IN
bore_stylePLAIN BOTH ENDS
head_styleFLAT CHAMFER
teeth_typeSINGLE HELIX
tooth_formSTANDARD
body_height8.688 INCHES NOMINAL IN
body_length2.250 INCHES NOMINAL IN
head_height0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
helix_angle3.5832 DEGREES
NSN5305-00-286-0520
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 51281 · 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
•
THREAD LENGTH: 1.110 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
POINT LENGTH: 0.180 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 24
•
POINT STYLE: CHAMFER DOG
•
MATERIAL: STEEL COMP 1213 OVERALL
•
HEAD STYLE: FLAT CHAMFER
•
POINT DIAMETER: 0.180 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH1.110 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
POINT LENGTH0.180 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
POINT STYLECHAMFER DOG
MATERIALSTEEL COMP 1213 OVERALL
HEAD STYLEFLAT CHAMFER
POINT DIAMETER0.180 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.312 INCHES IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
10S04-115WInterchangeable
interchangeable cross-reference
interchangeable
KB4ESSFNWInterchangeable
interchangeable cross-reference
interchangeable
BRE4-2015Interchangeable
interchangeable cross-reference
interchangeable
B21337Interchangeable
interchangeable cross-reference
interchangeable
979-1B445Interchangeable
interchangeable cross-reference
interchangeable
51281Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51281?
51281 is a TRANSFORMER,POWER AUTOTRANSFORME manufactured by Legrand.
What parts can replace 51281?
There are 7 known substitutes for 51281: 10S04-115W, KB4ESSFNW, BRE4-2015 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51281?
51281 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-286-0520. 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