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GR520W1 — RECEPTACLE,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

GR520W1: RECEPTACLE,TURNLOCK FASTENER.

The RECEPTACLE,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OR STEEL COMP 303SE HOUSING, mounting_style: PLAIN W/MOUNTING HOLE, receptacle_width: 0.425 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN, receptacle_height: 0.545 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN, surface_treatment: PASSIVATE OVERALL, receptacle_overall_length: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-925-6399, 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
GR520W1
NSN: 5325-00-925-6399
NIINs: 009256399, 011840371
FSC: 5325 — Fastening Devices
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 303SE HOUSING
mounting_stylePLAIN W/MOUNTING HOLE
receptacle_width0.425 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN
receptacle_height0.545 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
receptacle_overall_length0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
turnlock_receptacle_styleRECEPTACLE
turnlock_mounting_hole_diameter0.095 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
material_document_and_classificationAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE STUD
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
center_to_center_distance_between_mounting_holes0.682 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN
receptacle_thread_size_and_series/type_designator0.164-32 UNIFIED NATIONAL COARSE (UNC)
NSN5325-00-925-6399
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GR520W1 · 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
•
RECEPTACLE OVERALL LENGTH: 0.940 INCHES NOMINAL IN
•
RECEPTACLE THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.164-32 UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES: 0.682 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN
•
MOUNTING STYLE: FLOATING NUT
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
TURNLOCK RECEPTACLE STYLE: FLOATING
TECHNICAL CHARACTERISTICS
RECEPTACLE OVERALL LENGTH0.940 INCHES NOMINAL IN
RECEPTACLE THREAD SIZE AND SERIES/TYPE DESIGNATOR0.164-32 UNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CENTER TO CENTER DISTANCE BETWEEN MOUNTING HOLES0.682 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN
MOUNTING STYLEFLOATING NUT
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A286 ASSN STD SINGLE MATERIAL RESPONSE STUD
TURNLOCK RECEPTACLE STYLEFLOATING
RECEPTACLE WIDTH0.440 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 10
10187421Reference document
Same NSN cross-reference
Reference document — Informative reference only
9305840-006Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
NSA5551C01Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
71341911-001Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
533621-3Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
5325009256399Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GR520W1?
GR520W1 is a RECEPTACLE,TURNLOCK FASTENER.
What parts can replace GR520W1?
There are 10 known substitutes for GR520W1: 10187421, 9305840-006, NSA5551C01 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GR520W1?
GR520W1 is cataloged in the U.S. Government catalog under NSN 5325-00-925-6399. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.