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Technical Data Sheet
PartsTable / COMPONENT / 55131-108
55131-108 ✓ 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: 0.253 INCHES NOMINAL 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 5325-00-171-4237, 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
55131-108
NSN: 5325-00-171-4237
FSC: 5325
CAGE: F5442 — AIRBUS GROUP SAS (FRA)
SPECIFICATIONS
diameter0.253 INCHES NOMINAL 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_thickness0.240 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.671 INCHES MINIMUM AND 0.681 INCHES MAXIMUM IN
NSN5325-00-171-4237
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 55131-108 · 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
•
DIAMETER: 0.253 INCHES NOMINAL IN
•
STUD HEAD HEIGHT: 0.072 INCHES NOMINAL IN
•
EYELET LENGTH: 0.328 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
MATERIAL ACCOMMODATED THICKNESS: 0.240 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
•
EYELET OUTSIDE DIAMETER: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: STUD HEAD
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.253 INCHES NOMINAL IN
STUD HEAD HEIGHT0.072 INCHES NOMINAL IN
EYELET LENGTH0.328 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STUD ASSEMBLY STYLESTUD ASSEMBLY
MATERIAL ACCOMMODATED THICKNESS0.240 INCHES MINIMUM AND 0.269 INCHES MAXIMUM IN
EYELET OUTSIDE DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLESTUD HEAD
SECURING DEVICE TYPEWASHER
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.671 INCHES MINIMUM AND 0.681 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
7487Interchangeable
interchangeable cross-reference
interchangeable
7550775Interchangeable
interchangeable cross-reference
interchangeable
ML314Interchangeable
interchangeable cross-reference
interchangeable
27008Interchangeable
interchangeable cross-reference
interchangeable
5740672Interchangeable
interchangeable cross-reference
interchangeable
J30R6-TYPE1-5/8IDInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 55131-108?
55131-108 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 55131-108?
There are 16 known substitutes for 55131-108: 7487, 7550775, ML314 and 13 more. Substitute compatibility should be verified for your specific system.
Is 55131-108 still available?
55131-108 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