Authors Norman IskandarMechanical Engineering, Diponegoro University, Semarang, IndonesiaSulardjakaMechanical Engineering, Diponegoro University, Semarang, IndonesiaBernadus Endra Tri RahardjoMechanical Engineering, Diponegoro University, Semarang, Indonesia Abstract The notching process of stainless steel pipes is widely applied in fabrication industries, particularly for structural joint preparation. However, machining stainless steel presents inherent challenges due to its low thermal conductivity, high toughness, and work hardening characteristics. This study investigates tool failure in a bi-metal hole saw used under manual machining conditions based on real industrial observations. The research adopts an observational approach without controlled parameter variation, reflecting actual shop-floor conditions. The results indicate that tool degradation is strongly influenced by thermal accumulation, unstable manual feeding, and insufficient cooling conditions. The dominant wear mechanisms include abrasive wear, adhesive wear, and thermal degradation. Furthermore, the use of an alternative method such as an angle grinder improves productivity but reduces dimensional accuracy. This study highlights the importance of thermal management and process stability in improving machining performance in manual systems and provides practical insights applicable to small- and medium-scale industries. Keywords Cutting tool wear Stainless steel machining Manual machining process Thermal effects in machining Process stability Citation of this Article Norman Iskandar, Sulardjaka, & Bernadus Endra Tri Rahardjo. (2026). Analysis of Tool Failure in Stainless Steel Pipe Notching Using Bi-Metal Hole Saw under Manual Operation. International Current Journal of Engineering and Science (ICJES), 5(5), 1-8. Article DOI: https://doi.org/10.47001/ICJES/2026.505001 Licence Copyright (c) 2026 International Current Journal of Engineering and Science. 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