Best 1 3/8 Forstner Bit Options for Woodworking and Plastic Projects
Answer: A 1-3/8 inch Forstner bit is ideal for clean, flat-bottom holes in woodworking and plastics, with carbide-tipped bits offering longevity for frequent drilling. This guide highlights top picks for different buyers—specialists who drill hinges, furniture makers, hobbyists, and professionals needing reliable, burr-free holes—so you can choose the best fit for your projects. The table below compares five strong choices at a glance.
| Product | Best For | Key Feature | Notes |
|---|---|---|---|
| 1-3/8 Inch Forstner Bit (35mm) Tungsten Carbide | Furniture makers and hinge installation | Arc curve head for fast chip removal | Good balance of cutting speed and accuracy |
| Freud PB-010 1-3/8″ | Pro woodworkers | Razor sharp serrated edge | Forged construction for durability |
| 35mm Tungsten Carbide Forstner Bit | Hardwood and plastic work | Special design reduces burrs | Excellent for end-grain and knots |
| IRWIN 1-3/8″ | Flat-bottom pocket holes | Ultra-sharp knife edge | Efficient through hard and soft woods |
| Triple-Flute 1-3/8″ Forstner Bit | Versatile veneered plywood and plastics | Three-flute design for smoother cut | Longer life and less wobble |
Forstner Drill Bit, 1-3/8 Inch For Wood and Plastic
Product: Forstner Drill Bit, 1-3/8 Inch (35mm), designed for wood and plastic, with tungsten carbide cutting tip and a solid hardened steel body. The carbide tip is heat-treated for a sharp edge, high hardness, and burr-free performance. The arc-curved head aids chip removal and reduces incision resistance. Best for furniture hinges, door installation, and pocket hole projects where clean, flat-bottom holes are needed.
Best for: Hobbyists and professional furniture makers who need precise hinge holes with minimal burrs. Limitations: May require slower drilling in very hard materials without a sharpener.
Freud PB-010: 1-3/8″ Forstner Bit
Product: Freud PB-010 1-3/8″ Forstner Bit. Features include a 1-3/8″ diameter, 3-1/2″ length, right-hand rotation, and a 3/8″ shank. Razor-sharp edge enables fast, clean cuts, and forged construction provides extended life. Best for: Pro woodworkers requiring consistent, flat-bottom holes with smooth edges. Caution: Not all machines will accept larger shanks; verify chuck compatibility.
35mm Forstner Bit: Tungsten Carbide Upgrade
Product: 35mm (1-3/8 inch) Forstner Bit with upgraded tungsten carbide cutting edge. Shank is steel 45#; includes 54mm drilling depth and 88mm total length. The design emphasizes high hardness, wear resistance, and burr-free holes. Best for: Drilling neat holes in hardwoods, plastics, and through knots. Limitation: Arcuate chip removal design helps but deep cuts still generate heat; ensure steady feed rate.
IRWIN Marples 1-3/8″ Forstner Bit
Product: IRWIN Marples 1-3/8″ Forstner Bit. Features include ultra-sharp knife-edge design for smooth cutting through hard and soft woods and the ability to drill high-quality flat-bottomed and pocket holes. Best for: Woodworkers focusing on efficiency and precision for cabinetry or pocket-hole work. Caution: May require sharpening after extensive use on very hard woods.
Triple-Flute 1-3/8″ Forstner Bit
Product: 1-3/8″ Forstner Bit with triple-flute carbide tips. Specifications include drilling diameter 1-3/8″ (35mm), round shank 10mm, total length 92mm. The C2 carbide-tipped cutters provide clean, long-lasting sharpness with reduced wobble compared to two-flute designs. Best for: Veneered plywood, plastic, and mixed-material projects where clean, precise holes are critical. Limitation: Three-flute design can be slightly slower on very soft materials than two-flute variants.
Buying Guide
What to consider when choosing a 1-3/8 inch Forstner bit:
- Material compatibility: Carbide-tipped bits excel in hardwoods and plastics; consider your typical material mix.
- Hole quality: Look for burr-free edges and a design that facilitates chip removal, such as curved or multiple flutes.
- Durability: Forged steel bodies and carbide tips offer longer life under repeated use; balance cost with expected workload.
- Shank size: Ensure your drill chuck accepts a 3/8″ or 1/2″ shank as required by the bit; consider machine compatibility with larger shanks.
- Cutting geometry: Arc-head designs reduce resistance and speed up hole opening; multi-flute variants reduce wobble and burn.
- Depth rating: Check drilling depth to ensure holes meet your project requirements, especially for hinge mortises and pocket holes.
Frequently Asked Questions
- What is the advantage of a carbide-tipped Forstner bit? Answer: Carbide tips provide higher hardness, wear resistance, and longer edge life, allowing cleaner cuts in hard woods and plastics.
- Are 1-3/8 inch bits suitable for hinge holes? Answer: Yes, they are commonly used for hinge mortises and larger pocket holes due to their flat-bottom profile.
- Do three-flute bits cut faster than two-flute bits? Answer: Not necessarily; three-flute designs improve stability and reduce wobble, potentially improving edge quality but may cut slightly slower in soft materials.
- Can I resharpen carbide-tipped Forstner bits? Answer: Carbide tips can be resharpened in some cases, but many are designed to be replaced or require specialized equipment; consult manufacturer guidance.
- Which bit is best for end-grain cutting? Answer: Bits with sharp carbide tips and designs that minimize tear-out—arc-curved heads and high-quality carbide—are favorable for end grain.
- What drill settings should I use to avoid burrs? Answer: Use steady feed pressure, moderate speed, and test on scrap material; keep chips cleared to prevent heat buildup and burr formation.