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Technical Data Sheet
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56785 ✓ 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

The DIAPHRAGM CASE,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1330 OR STEEL COMP 4130 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.504 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN, recess_diameter: 0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN, outside_diameter: 0.840 INCHES NOMINAL IN, special_features: 0.050 RADIUS OUTSIDE CORNER OPPOSITE COUNTERSINK. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-287-6558, 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
56785
NSN: 3120-00-287-6558
FSC: 3120
CAGE: 80072 — H20 TANK INC U S MOTORS DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 1330 OR STEEL COMP 4130 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.504 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
recess_diameter0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
outside_diameter0.840 INCHES NOMINAL IN
special_features0.050 RADIUS OUTSIDE CORNER OPPOSITE COUNTERSINK
style_designatorRECESSED
surface_treatmentCADMIUM OVERALL
material_thickness0.078 INCHES NOMINAL IN
departure_from_cited_documentAS MODIFIED BY OUTSIDE DIAMETER AND SPECIAL FEATURES
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN3120-00-287-6558
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 56785 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: OIL LUBRICATING LUBRICATION
•
CORNER SHAPE: SQUARE ALL CORNERS
•
BODY INSIDE DIAMETER: 1.0020 INCHES MINIMUM AND 1.0030 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 1.3760 INCHES MINIMUM AND 1.3770 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALOIL LUBRICATING LUBRICATION
CORNER SHAPESQUARE ALL CORNERS
MATERIALCOPPER ALLOY OVERALL
BODY INSIDE DIAMETER1.0020 INCHES MINIMUM AND 1.0030 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER1.3760 INCHES MINIMUM AND 1.3770 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
OVERALL LENGTH1.0000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
5678-5Interchangeable
interchangeable cross-reference
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MS20002C8Interchangeable
interchangeable cross-reference
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10121636Interchangeable
interchangeable cross-reference
interchangeable
XM-36460-52-1000 -O-LInterchangeable
interchangeable cross-reference
interchangeable
24500NInterchangeable
interchangeable cross-reference
interchangeable
24500N PIECE 14Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 56785?
56785 is a DIAPHRAGM CASE,VALVE.
What parts can replace 56785?
There are 9 known substitutes for 56785: 5678-5, MS20002C8, 10121636 and 6 more. Substitute compatibility should be verified for your specific system.
Is 56785 still available?
56785 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026