18 Piece Tap & Drill Bit Set Fractional
If you've ever drilled a hole the wrong size before tapping it, you know why a matched tap-and-drill set matters. This 18-piece fractional set includes 9 drill-tap pairs — each drill bit sized precisely for the tap it's paired with, both gold surface treated, both precision ground — so the guesswork of looking up tap drill charts is eliminated on the shop floor.
What's Included
- 9 matched pairs: one drill bit + one tap per size
- Fractional tap and drill sizes covering the most commonly used coarse-thread series — including 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, and 1/2"-13, plus additional fractional pairs
- Hi-Molybdenum super premium twist drill bits — gold surface treated
- Hi-Tungsten Magnum super premium taps — gold surface treated
- 18 pieces total
Specifications
| Pieces | 18 (9 drill bits + 9 taps) |
| Configuration | 9 matched drill-tap pairs, fractional sizes |
| Drill bit material | Hi-Molybdenum super premium HSS |
| Tap material | Hi-Tungsten Magnum super premium HSS |
| Surface treatment | Gold — both drill bits and taps |
| Precision | Precision ground for accuracy and performance |
| Thread series | Fractional UNC coarse thread |
| SKU | DBSP18TD |
Best For / Applications
- Machine shops and job shops — tapping threaded holes in steel with matched tooling and no chart lookup between operations
- Maintenance and repair operations — re-tapping stripped or damaged threads and creating new tapped holes in steel components
- Fabrication and custom metalwork — adding threaded connections to steel plate, brackets, and structural members
- Fleet and heavy equipment maintenance — field tapping for bolt repairs where stripped threads need to be corrected fast
- Apprentice and training environments — eliminating tap drill chart errors by pairing the correct tools together from the start
About Tap & Drill Sets
The most common tapping error is using the wrong size drill bit — either too large (producing a weak, under-engaged thread) or too small (overloading the tap and breaking it). A matched set eliminates that error entirely: each drill bit in this set is sized to produce exactly the right minor diameter for the tap it's paired with.
Hi-Molybdenum drill bits are a super premium grade of high-speed steel with elevated molybdenum content, which improves red-hardness and wear resistance when drilling steel under heat. The paired Hi-Tungsten taps use elevated tungsten for similar reasons — maintaining hardness and edge sharpness through repeated tapping operations in steel.
Gold surface treatment on both tools increases surface lubricity, reduces friction during cutting, and provides mild corrosion resistance for storage. Precision grinding ensures that both the drill diameter and tap geometry are held to tight tolerances — which directly affects thread quality and fit.
Shipping & Ordering
- Ships within 1–2 business days from our warehouse
- Volume pricing available — contact us for multi-unit shop orders
- B2B accounts: Fleet managers, facilities teams, and machine shops can apply for a business account with custom pricing and a dedicated rep — contact us to get started