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GR540A1 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

GR540A1: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: EXTERNAL, usage_design: EXTERNAL, inside_diameter: 0.349 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN, major_thickness: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND PHOSPHATE. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-051-7085, 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
GR540A1
NSN: 5325-00-051-7085
FSC: 5325 — Fastening Devices
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL
ring_styleEXTERNAL
usage_designEXTERNAL
inside_diameter0.349 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
major_thickness0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND PHOSPHATE
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-051-7085
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GR540A1 · 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
•
USAGE DESIGN: EXTERNAL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MAJOR THICKNESS: 0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.349 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: EXTERNAL
•
SURFACE TREATMENT: CADMIUM AND PHOSPHATE
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
USAGE DESIGNEXTERNAL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MAJOR THICKNESS0.018 INCHES MINIMUM AND 0.022 INCHES MAXIMUM IN
INSIDE DIAMETER0.349 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEEXTERNAL
SURFACE TREATMENTCADMIUM AND PHOSPHATE
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 1
48450Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GR540A1?
GR540A1 is a RING,RETAINING.
What parts can replace GR540A1?
There is 1 known substitute for GR540A1: 48450. Substitute compatibility should be verified for your specific system.
What is the NSN for GR540A1?
GR540A1 is cataloged in the U.S. Government catalog under NSN 5325-00-051-7085. 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.