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Specification
Brand : DIYMakerLab
BulletPoint : CY-25B 70MM STEEL bull bovine eye ball wheel universal ball bearing balls transport round universal cooker round ball
BulletPoint1 : 360 universal rotation ball transfers bearings
BulletPoint2 : Material of Mail Shell & Ball: carbon steel
BulletPoint3 : Application: they are widely used in transmission system, transfer equipment, machinery, furniture, wheelchair, caster, wheel, trolley, conveyor
BulletPoint4 : Structure: Deep Groove
BulletPoint5 : Coatings: 440C Stainless Steel
ExternallyAssignedProductIdentifier : 5394239547418
ItemName : CY-25B 70MM Steel Bull Bovine Eye Ball Wheel Universal Ball Bearing Balls Transport Round Universal Cooker Round Ball
ItemPackageQuantity : 1
ItemTypeKeyword : ball-transfers
Manufacturer : DIYMakerLab
Material : steel
MountingType : Plate Mount
NumberOfItems : 1
PartNumber : Ycx_QAD11057
ProductDescription : WHY 440C STAINLESS steel?

Good corrosion resistance to water and many weak chemicals
Corrosion resistance can be improved by passivation
Good for temperatures up to 300°C

Slightly softer than chrome steel so lower load ratings
Will corrode in salt water or salt spray and poor resistance to acids/alkalis
More expensive than chrome steel

TECHNICAL SPECS

Item: S6007ZZ
Structure: Deep Groove
Material: 440C Stainless Steel ( prefix "S" )
Bore Dia (d): 35 mm
Outer Dia (D): 62 mm
Width (B): 14 mm
Closures: Metal Shielded(ZZ)
Lubrication: Grease
Magnetic: little
Hardness: 58HRC
Corrosion Resistance: General
Clearance: C0
Grades: ABEC Grades 1
Dynamic Load Rating (Cr) (Newtons): 15900
Static Load Rating (Cor) (Newtons): 10300
Ball Qty: 11
Ball Dia (Dw): 7.938 mm
Weight: 155 g
Quantity: 1 Lot = 2 PCS

What is 440C?

A martensitic stainless steel. It's composed of these major alloy elements (I don't list the minor elements since they don't play a major role):
Carbon: 0.95-1.25% This increases hardenability and wear resistance, but decreases toughness in higher amounts.
Manganese: 45% This is added to reduce brittleness and improve forgeability, hardenability, and reducing deformation.
Silicon: 30% This is a deoxidizer and improves hot-forming properties.
Chromium: 17.00-18.00% Added only to high alloy tool steels, this improves hardenability, high wear resistance, toughness, and corrosion resistance.
Molybdenum: 50% Improves deep hardening and toughness.

These basic elements (along with iron) are a simple combination that works well together, and has for many decades.
This alloy is technically classified as UNS (Unified Numbering System) S44044. It's also classified as SAE (Society for Automotive Engineers) as 51440C.
The American Iron and Steel Institute classifies it as 440C martensitic st
ProductSiteLaunchDate : 2021-07-03T04:16:17.648Z
Size : CY 12H(N)
SpecificationMet : Sae
SurfaceRecommendation : Multi-Surface
UnitCount : 5
UnspscCode : 31171500