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Technical Data Sheet
PartsTable / COMPONENT / FS1097-4
FS1097-4 ✓ 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: 0.298 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: SLOTTED, eyelet_length: 0.322 INCHES NOMINAL IN, surface_treatment: CADMIUM AND CHROMATE OVERALL, stud_assembly_style: STUD ASSEMBLY. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-290-3971, 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
FS1097-4
NSN: 5325-00-290-3971
FSC: 5325
CAGE: 80249 — BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. (USA)
SPECIFICATIONS
diameter0.298 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeSLOTTED
eyelet_length0.322 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_styleFILLISTER
material_accommodated_thickness0.150 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.692 INCHES MINIMUM AND 0.707 INCHES MAXIMUM IN
NSN5325-00-290-3971
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FS1097-4 · 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
•
MATERIAL ACCOMMODATED THICKNESS: 0.150 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL: STEEL OVERALL
•
SECURING DEVICE TYPE: WASHER
•
EYELET OUTSIDE DIAMETER: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
DIAMETER: 0.298 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FILLISTER
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL ACCOMMODATED THICKNESS0.150 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL OVERALL
SECURING DEVICE TYPEWASHER
EYELET OUTSIDE DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
DIAMETER0.298 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFILLISTER
EYELET LENGTH0.322 INCHES NOMINAL IN
STUD ASSEMBLY STYLESTUD ASSEMBLY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
31-46SB060Interchangeable
interchangeable cross-reference
interchangeable
26006Interchangeable
interchangeable cross-reference
interchangeable
26006AInterchangeable
interchangeable cross-reference
interchangeable
305-4303Interchangeable
interchangeable cross-reference
interchangeable
A26-006Interchangeable
interchangeable cross-reference
interchangeable
F92I268Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FS1097-4?
FS1097-4 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace FS1097-4?
There are 16 known substitutes for FS1097-4: 31-46SB060, 26006, 26006A and 13 more. Substitute compatibility should be verified for your specific system.
Is FS1097-4 still available?
FS1097-4 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