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Specification
AgeRangeDescription : adult
Brand : HJCMOONB
BulletPoint1 : Bearings
BulletPoint2 : Model Number: S51111
BulletPoint3 : Torque Capacity: 55*78*16mm
BulletPoint4 : Material: 440C Stainless Steel ( prefix "S" )
BulletPoint5 : Surface Roughness: Ra 0.05; Structure: Ball bearing
BulletPoint6 : Coatings: Stainless Steel
Color : One Color
ExternallyAssignedProductIdentifier : 9029027217773
ItemName : HJCMOONB S51111 Deep Groove Ball Bearing ABEC-1 Stainless Steel Thrust S 51111 Ball Bearing 557816 mm
ItemPackageDimensions_Height : 1 centimeters
ItemPackageDimensions_Length : 1 centimeters
ItemPackageDimensions_Width : 1 centimeters
ItemPackageQuantity : 1
ItemTypeKeyword : magnetic-bearings
Manufacturer : HJCMOONB
ModelName : HJCMOONB
ModelNumber : HJCMOONB
NumberOfBoxes : 1
NumberOfItems : 1
PartNumber : HJCMOONB
ProductDescription : Bearings
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: S51108
Structure: Deep Groove
Material: 440C Stainless Steel ( prefix "S" )
Bore Dia (d): 55 mm
Outer Dia (D): 78 mm
Magnetic: little
Hardness: 58HRC
Corrosion Resistance: General
Clearance: C0
Grades: ABEC Grades 1
Static Load Rating (Cor) (Newtons): 45640
Dynamic Load Rating (Cr) (Newtons): 17416
Weight: 149.8 g
Quantity: 1 Lot = 1 PC
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 standard stainless steel. Most modern knifemakers simply call it 440C.
ProductSiteLaunchDate : 2025-05-10T09:55:43.005Z
Size : One Size
UnitCount : 1
UnspscCode : 26111500