Taper shank twist drills—Part 4:The types and dimensions extra-long for Morse taper shank twist drills
MOD ISO 3291:1995
全国刀具标准化技术委员会(SAC/TC 91)
GB/T 1438的本部分规定了莫氏锥柄超长麻花钻的型式和尺寸。
本部分适用于直径6.00 mm～50.00 mm和总长为200.00 mm～630.00 mm的莫氏锥柄超长麻花钻。
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