When choosing a 1-1/8 inch drill bit, select a model that matches your material and drilling conditions. The top picks here are best for professional contractors, DIY enthusiasts, and metal or woodworkers who need reliable sizing and performance. This guide highlights five suitable options, explaining who each is best for and why.
Summary at a glance: the following table compares the five selected 1-1/8 inch drill bits by material, coating, and ideal use case.
| Product | Material/Coating | Best For | Notes |
|---|---|---|---|
| Drill America KFDRSD1-1/8 | High-speed steel; gold/black coating | General purpose metal and stainless work | Reduced shank; compatible with various toolholding systems |
| 1-1/8″ HSS M2 Twist Drill Bit | High-speed steel M2; gold oxide finish | DIY to light professional metal and wood tasks | Round shank; 118° split point |
| Auger Bit For Wood 1 x 18 | Coarse wood auger geometry | Large wood boring | Hex shank; long reach |
| 1″ SDS Plus Rotary Hammer Bit | Carbide tipped masonry | Brick, stone, concrete drilling | SDS Plus compatible |
| ANGELSWORD 1″ Reduced Shank Bit | M2 cobalt HSS; gold titanium/black nitride | Hardwood and mild steel | 1/2″ universal shank; high durability |
Drill America KFDRSD1-1/8 Reduced Shank Bit
Best for mixed metal drilling and stainless work, this high-speed steel bit combines hardness and toughness for wear resistance. The gold and black surface treatment supports use in stainless steel and other hard metals, while the round shank accommodates a wide range of toolholding systems. Suitable for professional metal fabrication or shop repairs where a 1-1/8 inch diameter is needed. Limitations include potential reduced performance in extremely soft plastics or non-ferrous materials where planning for chip removal is minimal.
1-1/8″ HSS M2 Twist Drill Bit With Round Shank
This 1-1/8 inch twist drill bit uses M2 high-speed steel with a durable gold oxide finish for sharpness, corrosion resistance, and cooler operation. The 118° split point reduces walking on contact, making it ideal for general-purpose drilling in steel, copper, aluminum, and various alloys. Best for contractors, electricians, and DIYers who need reliable performance across a broad material range. Caution: ensure spindle clearance and avoid overheating in high-speed, pilot-heavy cuts.
1 x 18 Auger Drill Bit For Wood
Best for large-diameter wood boring, this 1 x 18 inch auger bit is long-reach, designed for deep holes in soft and hardwoods. The hex shank helps secure through-hole drilling in power tools with compatible chucks. Use this bit for carpentry or woodworking projects requiring long through-holes. A potential limitation is its size; it may require technique adjustment and stable material support to prevent splintering or drift on initial contact.
1 Inch SDS Plus Rotary Hammer Bit
Carbide tipped for masonry drilling, this SDS Plus bit is designed for brick, stone, and concrete. It is compatible with SDS Plus rotary hammers from major brands, providing robust performance for heavy-duty construction tasks. Best for professional masons and tradespeople working in rubble, block, or solid masonry. Limitation: ensure your hammer is compatible with SDS Plus bits and check length and diameter for your specific drill model.
ANGELSWORD 1″ Reduced Shank Drill Bit
Designed for hard wood, mild steel, and metal applications, this 1-inch reduced shank bit features a 1/2″ universal 3-flat shank, compatible with most power tools and presses. The M2 cobalt HSS construction plus gold titanium and black nitride coating provides durability and corrosion resistance, useful for heavy-duty metalworking and woodworking. Best for users handling thick hardwoods or denser metals. Caution: drilling at lower speeds reduces burr formation and heat buildup.
Buying Guide
What should you consider when choosing a 1-1/8 inch drill bit?
- Material compatibility: Metal, wood, masonry each require different tip geometry and coatings. Consider high-speed steel for general metal work, carbide-tipped for masonry, and auger bits for deep wood holes.
- Shank type: Round or reduced shank may affect toolholding compatibility. Ensure your drill chuck or machine supports the shank style.
- Coatings: Gold oxide, titanium nitride, or other coatings can improve wear resistance and reduce friction in tough materials.
- Point geometry: Split points or auger tips influence start accuracy and chip removal. A split point reduces walking in metal, while auger designs excel in wood.
- Drill speed and material thickness: Match rotational speed to material hardness and thickness to minimize heat and burrs.
- Tooling ecosystem: If you use SDS Plus hammers or press tools, confirm compatibility with your equipment.
FAQ
- What tasks are 1-1/8 inch drill bits best for?
– They are often used for larger metal, wood, and masonry holes where a 1-1/8 inch diameter is required. - Do I need an SDS Plus bit for a hammer drill?
– Yes, SDS Plus bits are designed for hammer drills with compatible chucks and provide better hammering performance in masonry. - Which coating lasts longest on metal drilling?
– Coatings like titanium nitride or gold oxide improve wear resistance and reduce friction, extending bit life under tougher conditions. - Can I use a standard drill with an auger bit?
– Auger bits require appropriate chuck compatibility and stable guidance; ensure your drill can accommodate long, heavy bits and maintain control. - How do I avoid burrs when drilling metal?
– Lower your speed, use cutting oil or coolant, and choose a point geometry suited for metal to reduce burr formation. - Is a reduced shank compatible with all drills?
– Reduced shanks fit many standard chucks but verify your tool’s maximum shank size and clamping force.