仕様ねじサイズ = #4-40タイプ = スパイラルポイントねじ規格 = UNC全体長さ = 48 mm材質 = HSSシャンク径 = 3.15 mmシャンクタイプ = プレーンUNC HSS Spiral Point Ground Taps. Precision HSS taps for machine tapping Can be used for hand tapping without need of a lead tap. Designed with a straight flute supplemented by an angular cutting point leaves the flutes clear of swarf for free coolant flow. Blue steam tempered finish reduces friction and produces a fine finish thread