S687ZZ Deep Groove Ball Bearing ABEC-1 440C Roller Stainless Steel Ball Bearings S687Z S687 Z ZZ 7 * 14 * 5 mm

ball bearingBearingWHY 440C STAINLESS steel?Good corrosion resistance to water and many weak chemicalsCorrosion resistance can be improved by passivationGood for temperatures up to 300°CSlightly softer than chrome steel so lower load ratingsWill corrode in salt water or salt spray and poor resistance to acids/alkalisMore expensive than chrome steelWhat 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.Item: S687ZZStructure: Deep GrooveMaterial: 440C Stainless Steel ( prefix "S" )Bore Dia (d): 7 mmOuter Dia (D): 14 mmWidth (B): 5 mmClosures: Metal Shielded(ZZ)Lubrication: GreaseMagnetic: little Hardness: 58HRCCorrosion Resistance: GeneralClearance: C0Grades: ABEC Grades 1Dynamic Load Rating (Cr) (Newtons): 997 Static Load Rating (Cor) (Newtons): 410Ball Qty: 9Ball Dia (Dw): 2.000 mmWeight:

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