Precision Twist Drill 5998217 5/8" Cobalt Jobber Length Drill Bit 135° Split Point

The Precision Twist Drill 5998217 is a heavy-duty cobalt jobber length drill bit from the R10CO/R15CO/R18CO series, designed for demanding drilling applications in hard and abrasive materials. With a 5/8" (0.6250") diameter and a 135-degree split point, this bit delivers faster starts, reduced walking, and lower thrust force compared to conventional 118-degree points.

Key Features:

• Diameter: 5/8" (0.6250 in)
• Overall Length (OAL): 7-1/8 in
• Point Angle: 135 degrees
• Material: High-Speed Steel Cobalt (HSS-Co) for superior heat and wear resistance
• Finish: Straw (heat-treated surface finish)
• Flute Style: Regular spiral flute for efficient chip evacuation
• Shank Type: Straight shank for compatibility with standard drill chucks
• Cutting Direction: Right hand cut
• Series: R10CO / R15CO / R18CO

The cobalt alloy construction makes this drill bit well-suited for cutting through stainless steel, hardened alloys, cast iron, titanium, and other tough materials that would quickly wear out standard HSS bits. The straw finish indicates a tempered surface treatment that enhances hardness and longevity. This is a professional-grade jobber length bit trusted across aerospace, automotive, and general manufacturing applications.