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GS31AB ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

FITTING ASSEMBLY,HEAD END CYLIND. Key specifications include material: ALUMINUM ALLOY OVERALL, corner_shape: SQUARE INSIDE RIGHT CORNER, flange_width: 0.0270 INCHES MINIMUM AND 0.0320 INCHES MAXIMUM IN, overall_length: 0.4320 INCHES NOMINAL IN, style_designator: SOLID, EXTERNAL FLANGE ONE END, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-007-5801, 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
GS31AB
NSN: 3120-00-007-5801
FSC: 3120
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
corner_shapeSQUARE INSIDE RIGHT CORNER
flange_width0.0270 INCHES MINIMUM AND 0.0320 INCHES MAXIMUM IN
overall_length0.4320 INCHES NOMINAL IN
style_designatorSOLID, EXTERNAL FLANGE ONE END
surface_treatmentCADMIUM OVERALL
body_inside_diameter0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
body_outside_diameter0.3131 INCHES MINIMUM AND 0.3136 INCHES MAXIMUM IN
flange_outside_diameter0.4900 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN
system_for_which_designedNONPRESSURIZED
material_document_and_classificationAMS 4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN3120-00-007-5801
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: GS31AB · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CORNER SHAPE: SQUARE OUTSIDE LEFT CORNER
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
FLANGE OUTSIDE DIAMETER: 0.4900 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
BODY INSIDE DIAMETER: 0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CORNER SHAPESQUARE OUTSIDE LEFT CORNER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CORNER SHAPESQUARE LEFT FLANGE BODY CORNER
FLANGE OUTSIDE DIAMETER0.4900 INCHES MINIMUM AND 0.5100 INCHES MAXIMUM IN
CORNER SHAPESQUARE LEFT FLANGE OUTSIDE RIGHT CORNER
CORNER SHAPESQUARE INSIDE LEFT CORNER
SURFACE TREATMENTCADMIUM OVERALL
BODY INSIDE DIAMETER0.2500 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
FLANGE WIDTH0.0270 INCHES MINIMUM AND 0.0320 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, EXTERNAL FLANGE ONE END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
128HM40095Interchangeable
interchangeable cross-reference
interchangeable
G41Interchangeable
interchangeable cross-reference
interchangeable
128HM10505-1Interchangeable
interchangeable cross-reference
interchangeable
GS30BInterchangeable
interchangeable cross-reference
interchangeable
A51B52567-19Interchangeable
Same NIIN cross-reference
interchangeable
GS30BFInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GS31AB?
GS31AB is a FITTING ASSEMBLY,HEAD END CYLIND.
What parts can replace GS31AB?
There are 6 known substitutes for GS31AB: 128HM40095, G41, 128HM10505-1 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GS31AB?
GS31AB is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-007-5801. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026