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The percentage of an oil seal refers to its ability to effectively prevent leakage. A higher percentage indicates a better sealing capacity, with 100% being the ideal value. However, in reality, achieving a perfect seal is often challenging. Therefore, oil seals with percentages ranging from 25% to 35% are commonly used in applications where a high level of sealing performance is required.
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For larger drill bits, a taper shank may be used. Taper shanks have a gradual taper that allows them to fit securely into a drill press or lathe

drill bit shank types. These shanks provide more stability and strength for drilling through tough materials like metal or masonry. Taper shanks are often used in industrial settings where precision and durability are key.

drill bit shank types. These shanks provide more stability and strength for drilling through tough materials like metal or masonry. Taper shanks are often used in industrial settings where precision and durability are key.