PartsTable
Technical Data Sheet
Download PDF

GS520C7-39 — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

GS520C7-39: STUD,TURNLOCK FASTENER.

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 OR STEEL COMP 8620 OVERALL, drive_type: SLOTTED, grip_length: 0.590 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN, shank_neck_length: 0.450 INCHES NOMINAL IN, surface_treatment: CADMIUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-048-0127, 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
GS520C7-39
NSN: 5325-01-048-0127
FSC: 5325 — Fastening Devices
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
diameter0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
materialSTEEL OR STEEL COMP 8620 OVERALL
drive_typeSLOTTED
grip_length0.590 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
shank_neck_length0.450 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
nondefinitive_spec/std_data1 TYPE AND ASSJCLB CLASS AND 1 STYLE AND 2 SIZE
material_accommodated_thickness0.361 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN
material_document_and_classificationSAE 2317 ASSN STD 1ST MATERIAL RESPONSE AND AISI 8620 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NSN5325-01-048-0127
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GS520C7-39 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,CLASS 2,TYPE 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DRIVE TYPE: SLOTTED
•
MATERIAL ACCOMMODATED THICKNESS: 0.361 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 2317 ASSN STD 1ST MATERIAL RESPONSE AND AISI 8620 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
SHANK NECK LENGTH: 0.450 INCHES NOMINAL IN
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND ASSJCLB CLASS AND 1 STYLE AND 2 SIZE
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,CLASS 2,TYPE 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.361 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 2317 ASSN STD 1ST MATERIAL RESPONSE AND AISI 8620 ASSN STD 2ND MATERIAL RESPONSE OVERALL
DIAMETER0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
SHANK NECK LENGTH0.450 INCHES NOMINAL IN
NONDEFINITIVE SPEC/STD DATA1 TYPE AND ASSJCLB CLASS AND 1 STYLE AND 2 SIZE
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
STUD SHANK MAJOR DIAMETER0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 4
MIL-F-5591Reference document
Same NSN cross-reference
Reference document — Secondary reference
F31-2T37Reference document
Same NSN cross-reference
Reference document — Secondary reference
GS520C7-37Reference document
Same NSN cross-reference
Reference document — Secondary reference
F3.5T39Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy GS520C7-39?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is GS520C7-39?
GS520C7-39 is a STUD,TURNLOCK FASTENER.
What parts can replace GS520C7-39?
There are 4 known substitutes for GS520C7-39: MIL-F-5591, F31-2T37, GS520C7-37 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GS520C7-39?
GS520C7-39 is cataloged in the U.S. Government catalog under NSN 5325-01-048-0127. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — GS520C7-39

✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.