Accupro 4500383 Letter F Solid Carbide Drill Bit 140 Deg

Product Description

The ACCUPRO 4500383 is a screw machine length drill bit designed for high-performance drilling in demanding industrial and machining applications. Built from solid carbide and coated with TiAlN, this bit delivers superior heat resistance and wear life compared to standard HSS tooling. The bit cuts a 0.2570 inch (Letter F) diameter hole with a 140-degree web-thinned point that reduces thrust and improves centering on entry. With an overall length of 3.465 inches and a 1.279 inch flute length, it fits compact drilling setups where stub length is required. It is sized for right-hand rotation and features a straight cylindrical shank of 0.2656 inch diameter for standard chuck compatibility.

This bit is engineered primarily for stainless steels, a material group that demands sharp, rigid cutting geometry and efficient heat management. The TiAlN coating performs well in high-temperature cutting environments common when drilling austenitic and martensitic stainless grades. Coolant-through capability supports through-spindle coolant delivery, which is critical in production drilling of stainless to flush chips and reduce heat at the cutting edge. It fits CNC machining centers, drill presses, and manual machines equipped with compatible straight-shank chucks. Machinists, toolroom operators, and job shop technicians are the primary users of this bit in production and prototype environments.

Key Features

• Solid carbide construction provides rigidity and wear resistance for hard and abrasive materials
• TiAlN coating enhances thermal barrier performance during high-speed drilling in stainless steels
• 140-degree web-thinned (R-thinned) point reduces thrust and improves hole entry accuracy
• Coolant-through design supports through-spindle coolant for chip evacuation and heat control
• Screw machine (stub) length format reduces overhang and increases rigidity in tight setups
• Regular spiral flute geometry provides consistent chip removal in through-hole applications

Compatibility

Designed as an OEM-style replacement or direct tooling selection for screw machine length drilling applications targeting stainless steels, sized for use in any standard straight-shank chuck accepting a 0.2656 inch shank diameter. Listed under series ASSC140-TA-CL and conforms to ISO specification designation for Letter F drill sizing.

Installation Notes

Installation and tool changes should be performed with the machine fully powered down and the spindle at rest. Machinists should verify chuck or collet bore compatibility with the 0.2656 inch shank diameter before seating the bit. Secure the shank fully within the chuck jaws to the recommended grip depth to prevent pullout under cutting loads. When using coolant-through capability, confirm that the machine spindle and toolholder are rated and plumbed for through-spindle coolant delivery before engaging the coolant system.