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GR540BK — RING,PISTON

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

GR540BK: RING,PISTON.

The RING,PISTON is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, ring_style: CONCENTRIC, joint_style: STEP JOINT, overall_width: 0.0910 INCHES NOMINAL IN, special_features: W/1 EXPANDER, surface_treatment: PHOSPHATE MANGANESE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4310-01-086-8668, 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
GR540BK
NSN: 4310-01-086-8668
FSC: 4310 — Compressors and Vacuum Pumps
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialIRON OVERALL
ring_styleCONCENTRIC
joint_styleSTEP JOINT
overall_width0.0910 INCHES NOMINAL IN
special_featuresW/1 EXPANDER
surface_treatmentPHOSPHATE MANGANESE OVERALL
radial_wall_thickness0.0890 INCHES NOMINAL IN
standard_bore_diameter3.494 INCHES IN
cross-sectional_shape_stylePLAIN RECTANGULAR, STRAIGHT FACE
material_document_and_classificationAMS7310 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationAMS2481 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN4310-01-086-8668
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING,PISTON TITLE COMPONENT PN GR540BK MFR RING,PISTON
KEY FEATURES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS2481 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS7310 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: PLAIN RECTANGULAR, STRAIGHT FACE
•
JOINT STYLE: STEP JOINT
•
RADIAL WALL THICKNESS: 0.0890 INCHES NOMINAL IN
•
RING STYLE: CONCENTRIC
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS2481 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
OVERALL WIDTH0.0910 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS7310 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLEPLAIN RECTANGULAR, STRAIGHT FACE
JOINT STYLESTEP JOINT
RADIAL WALL THICKNESS0.0890 INCHES NOMINAL IN
RING STYLECONCENTRIC
SPECIAL FEATURESW/1 EXPANDER
SURFACE TREATMENTPHOSPHATE MANGANESE OVERALL
STANDARD BORE DIAMETER3.494 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 1
GR540BK1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GR540BK?
GR540BK is a RING,PISTON.
What parts can replace GR540BK?
There is 1 known substitute for GR540BK: GR540BK1. Substitute compatibility should be verified for your specific system.
What is the NSN for GR540BK?
GR540BK is cataloged in the U.S. Government catalog under NSN 4310-01-086-8668. 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.