Alpha One Quarter Inch Jobber Drill Bit HSS Versatile For Metal Wood Plastic Durability And Precision Pros And DIYers
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1/4 in Jobber Drill Bit — Alpha
The 1/4 in Jobber Drill Bit from Alpha is a dependable, all-purpose tool built to tackle metal, wood, and plastic with consistent results. Its balanced length and straight shank keep you drilling efficiently across a range of machines—from standard drill chucks to drill presses and CNC setups.
- Diameter and compatibility: 1/4" drill bit with a straight shank that fits secure in standard drill chucks, drill presses, and CNC machines for versatile use.
- Material and durability: High-Speed Steel (HSS) core designed to withstand heat and wear for repeat performance across projects.
- Precision tip options: 118° point angle for general-purpose drilling and 135° variants for harder metals, allowing you to choose the cut that best suits your material.
- Coating choices: Titanium coating for smoother cutting and longer life; cobalt versions excel on tough metals like stainless steel; black oxide provides corrosion resistance and easier chip control.
- Applications: Ideal for anchor holes, pilot holes, and bolt-hole prep in mild steel, aluminum, hardwood, softwood, and common plastics like acrylics and PVC.
- Usage guidance: Pair with appropriate speed and light lubrication for metal work; start with a smaller pilot hole for dense materials; keep chips clear to prevent heat buildup and ensure a true, straight hole.
Designed for both DIY enthusiasts and professional shop environments, this 1/4" jobber drill bit delivers reliable hole quality and straightforward handling across a broad range of materials. Its coating options and precise tip angles empower you to optimize performance for each job, helping you finish hardware installations, cabinetry, furniture projects, and general construction tasks with confidence.
| Size | Decimal Equivalent (inches) | Applications |
|---|---|---|
| 1/16" | 0.0625" | Small precision holes in metal, wood, and plastic |
| 5/64" | 0.0781" | Fine drilling, electronics, small fasteners |
| 3/32" | 0.0938" | Light-duty metalwork, pilot holes |
| 7/64" | 0.1094" | General-purpose small drilling tasks |
| 9/64" | 0.1406" | Woodworking, plastics, and thin metals |
| 5/32" | 0.1563" | Common for DIY, metal, and wood applications |
| 11/64" | 0.1719" | Intermediate size for various drilling tasks |
| 3/16" | 0.1875" | Standard for general-purpose drilling |
| 13/64" | 0.2031" | Used in woodworking and automotive drilling |
| 7/32" | 0.2188" | Commonly used for hardware installations |
| 15/64" | 0.2344" | General drilling tasks in soft and hard materials |
| 1/4" | 0.2500" | Popular size for anchors, pilot holes, and construction |
| 17/64" | 0.2656" | Intermediate size for metal and wood drilling |
| 9/32" | 0.2813" | Ideal for furniture making and general use |
| 5/16" | 0.3125" | General workshop drilling, bolt holes |
| 21/64" | 0.3281" | Slightly larger than 5/16" for snug fits |
| 11/32" | 0.3438" | Heavy-duty drilling in metal and wood |
| 13/32" | 0.4063" | Used for large fasteners and industrial work |
| 3/8" | 0.3750" | Common size for structural and industrial applications |