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Common Hardware Material Comparison (Hardness, Heat Treatment, Corrosion Resistance)

MaterialTypeHeat treatment / hardness (SFP standard)Corrosion resistantTypical use
SUJ2High-carbon chromium bearing steelHardened HRC 56-62No (can be plated)Dowel pins, ejector pins; high hardness and wear resistance
S45CMedium carbon steelQuenched and tempered HRC 36-42No (can be black oxide / plated)General structural pins, machine parts
SUS304Austenitic stainless steelNot through-hardenedExcellentCorrosive environments: food, electronics, outdoor
12L14Free-machining steelUsually not heat treatedNoTurned parts, bodies of internally threaded dowel pins
SK7Carbon tool steel (spring)Hardened and tempered (elastic)No (black oxide / nickel plated)E-rings, C-rings and other spring retaining rings

Hardness values are SFP product standards; for individual items, the product page takes precedence.

How to choose

For "hard and wear resistant" choose SUJ2; for "corrosion resistant" choose SUS304 (lower hardness); for general structural use, S45C. Retaining rings are spring steel (SK7 etc.) by nature; for corrosion resistance choose stainless rings.

SUJ2 bearing steel dowel pins (in stock)

0.5*40.6*160.7*160.8*40.8*50.8*7.80.8*160.9*70.9*161*21*2.81*31*3.21*41*4.71*4.81*51*5.11*5.31*5.51*61*6.51*6.81*71*7.51*7.81*81*8.31*8.41*91*9.81*101*10.51*111*121*141*151*161*181*191*201*221*241*251*261*281*301*341*36.51.05*2.91.05*6.51.1*5.31.1*5.51.1*5.71.1*61.1*6.51.1*7.71.1*81.1*101.1*12 … more sizes: search the interactive catalog

SUS304 stainless steel dowel pins (in stock)

0.5*20.5*30.5*40.5*50.5*60.5*70.5*80.5*100.5*110.5*120.5*150.5*200.55*50.55*80.55*100.6*20.6*40.6*50.6*60.6*70.6*80.6*100.6*120.6*150.6*200.65*50.7*20.7*30.7*40.7*50.7*60.7*70.7*80.7*90.7*100.7*130.7*150.7*200.75*40.75*50.75*80.75*100.75*110.8*20.8*30.8*40.8*50.8*60.8*70.8*80.8*90.8*100.8*120.8*130.8*150.8*160.85*50.85*60.85*80.85*10 … more sizes: search the interactive catalog

Click a size to open its product page (price and stock status); lists update automatically with our stock.

📂 Dowel pin categories📂 Retaining ring categories📐 Tolerance selection

Need a quote? Email your part list (Excel supported) to sfp@sfp-tw.com or give us a call. For parts you found on overseas platforms such as McMaster-Carr or MISUMI, we can also help check which equivalent items are available in Taiwan. You can also check stock status in the interactive catalog.

🔍 Interactive catalog📚 More guides