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Technical Data Sheet
PartsTable / COMPONENT / GB00581-4
GB00581-4 ✓ 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

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.251 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: SLOTTED, eyelet_length: 0.328 INCHES NOMINAL IN, stud_head_height: 0.072 INCHES NOMINAL IN, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-298-7001, 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
GB00581-4
NSN: 5325-00-298-7001
FSC: 5325
CAGE: 01714 — LUCENT TECHNOLOGIES INC ADVANCED TECHNOLOGY SYSTEMS (USA)
SPECIFICATIONS
diameter0.251 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeSLOTTED
eyelet_length0.328 INCHES NOMINAL IN
stud_head_height0.072 INCHES NOMINAL IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeWASHER
eyelet_outside_diameter0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
turnlock_stud_head_styleSTUD HEAD
material_accommodated_thickness0.120 INCHES MINIMUM AND 0.149 INCHES MAXIMUM IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
NSN5325-00-298-7001
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GB00581-4 · 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
•
STUD HEAD HEIGHT: 0.072 INCHES NOMINAL IN
•
MATERIAL ACCOMMODATED THICKNESS: 0.120 INCHES MINIMUM AND 0.149 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL: STEEL OVERALL
•
EYELET LENGTH: 0.328 INCHES NOMINAL IN
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: STUD HEAD
•
SECURING DEVICE TYPE: WASHER
TECHNICAL CHARACTERISTICS (FLIS)
STUD HEAD HEIGHT0.072 INCHES NOMINAL IN
MATERIAL ACCOMMODATED THICKNESS0.120 INCHES MINIMUM AND 0.149 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL OVERALL
EYELET LENGTH0.328 INCHES NOMINAL IN
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLESTUD HEAD
SECURING DEVICE TYPEWASHER
DIAMETER0.251 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN
EYELET OUTSIDE DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
ES0000050Interchangeable
interchangeable cross-reference
interchangeable
MEC1129Interchangeable
interchangeable cross-reference
interchangeable
27004Interchangeable
interchangeable cross-reference
interchangeable
27004-01Interchangeable
interchangeable cross-reference
interchangeable
131314Interchangeable
interchangeable cross-reference
interchangeable
610165-002Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GB00581-4?
GB00581-4 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace GB00581-4?
There are 18 known substitutes for GB00581-4: ES0000050, MEC1129, 27004 and 15 more. Substitute compatibility should be verified for your specific system.
Is GB00581-4 still available?
GB00581-4 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: July 2026