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Technical Data Sheet
PartsTable / COMPONENT / MIL-F-5591
MIL-F-5591 ✓ 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

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: SLOTTED, grip_length: 0.560 INCHES NOMINAL IN, shank_neck_length: 0.410 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-057-6367, 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
MIL-F-5591
NSN: 5325-00-057-6367
FSC: 5325
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
diameter0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeSLOTTED
grip_length0.560 INCHES NOMINAL IN
shank_neck_length0.410 INCHES NOMINAL IN
surface_treatmentCADMIUM OVERALL
turnlock_stud_head_styleFLAT COUNTERSUNK
stud_shank_major_diameter0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.301 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5325-00-057-6367
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-F-5591 · 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 SHANK MAJOR DIAMETER: 0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
•
MATERIAL ACCOMMODATED THICKNESS: 0.051 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
•
GRIP LENGTH: 0.290 INCHES NOMINAL IN
•
MATERIAL: STEEL OR STEEL COMP 8620 OVERALL
•
SHANK NECK LENGTH: 0.170 INCHES NOMINAL IN
•
DIAMETER: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND A CLASS AND B CLASS AND 1 STYLE AND 2 SIZE
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STUD SHANK MAJOR DIAMETER0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
MATERIAL ACCOMMODATED THICKNESS0.051 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
GRIP LENGTH0.290 INCHES NOMINAL IN
MATERIALSTEEL OR STEEL COMP 8620 OVERALL
SHANK NECK LENGTH0.170 INCHES NOMINAL IN
DIAMETER0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND A CLASS AND B CLASS AND 1 STYLE AND 2 SIZE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DRIVE TYPESLOTTED
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
F31-2T6Interchangeable
Same NIIN cross-reference
interchangeable
F3.5T6Interchangeable
Same NIIN cross-reference
interchangeable
F35T6Interchangeable
Same NIIN cross-reference
interchangeable
50-007F6Interchangeable
Same NIIN cross-reference
interchangeable
F3 1/2T6Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-F-5591?
MIL-F-5591 is a STUD,TURNLOCK FASTENER.
What parts can replace MIL-F-5591?
There are 5 known substitutes for MIL-F-5591: F31-2T6, F3.5T6, F35T6 and 2 more. Substitute compatibility should be verified for your specific system.
Is MIL-F-5591 still available?
MIL-F-5591 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