China manufactures high-quality drill glass bits with diamond or carbide tips, designed to cut glass, tile, and ceramics cleanly without cracking. Leading suppliers like Rettek offer OEM customization and durable carbide options that last 5-10 times longer than standard bits, providing precise, reliable holes for bottles, mirrors, windows, and other industrial applications.
What Is a Drill Glass Bit?
A drill glass bit is a precision tool with a diamond or carbide tip engineered to penetrate glass, ceramic, and tile smoothly without chipping. Its spear-point tip and compatibility with cooling lubricants ensure accuracy during drilling.
These bits are essential in professional and industrial settings, outperforming standard HSS bits by offering reinforced tips for clean, controlled penetration. Chinese manufacturers produce sizes ranging from 3mm to 50mm with features like:
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Spear-shaped tip to prevent slipping and cracking.
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Alloy steel shank for compatibility with cordless and industrial drills.
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Wear-resistant coatings extending service life up to 1,000 holes per bit.
Rettek, based in Zigong, Sichuan, specializes in carbide-tipped bits with vacuum sintering, offering consistent tolerances (±0.1mm) ideal for high-volume glass production.
How Does a Drill Glass Bit Work?
Drill glass bits grind rather than cut, using diamond or carbide tips to score the surface while coolant dissipates heat, preventing cracks. Optimal operation requires 400–800 RPM with light, steady pressure.
The bit’s abrasion-based mechanism starts with a pilot hole that gradually widens. Electroplated diamond grit (40/50 mesh) bonded to a tungsten carbide substrate balances sharpness and toughness.
Rettek's brazing process secures grit retention, reducing failure rates by 40% in testing. This ensures minimal tool changes and higher efficiency during production.
What Are the Types of Drill Glass Bits?
Common types are spear-point diamond-coated, carbide-tipped, core (hollow), and threaded shank bits for different applications:
| Type | Material | Best For | Sizes Available |
|---|---|---|---|
| Spear-Point | Diamond-Coated | Bottles, Mirrors | 4-12mm |
| Carbide-Tipped | Tungsten Carbide | Thick Glass | 6-25mm |
| Core Drill | Diamond Rim | Large Holes | 25-100mm |
| Threaded Shank | Alloy Steel | Angle Grinders | 10-50mm |
China factories, including Rettek, excel at OEM production. Custom carbide-tipped bits allow adjustment of grit size and shank length to suit bulk orders.
How to Choose the Right Drill Glass Bit?
Selecting a bit depends on glass thickness, hole size, material type, and desired coating. Diamond tips offer precision; carbide ensures durability.
Key considerations:
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Thickness: <5mm requires fine-grit spear bits; >10mm uses core drills.
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Material: Tempered glass requires diamond-coated bits.
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Quantity: For bulk wear resistance, opt for wholesale carbide bits from manufacturers like Rettek.
Follow speed guidelines (e.g., 400 RPM for 10mm glass) and test sample bits. Rettek provides prototypes to optimize performance for client drills.
Why Are China Manufacturers Best for Wholesale?
China offers scale, cost-efficiency, OEM flexibility, and quality control through in-house sintering. Production hubs like Zigong and Zhenjiang manage the process from raw tungsten to finished bits.
Advantages include:
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MOQs as low as 500 pieces.
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Custom logos and packaging.
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Rapid prototyping in 7–14 days.
Rettek integrates alloy preparation, vacuum sintering, and automated welding, reducing costs by 25% while increasing tool lifespan.
What Makes Carbide-Tipped Bits Superior?
Carbide-tipped bits resist wear 5–10 times longer than standard steel, withstand heat up to 800°C, and drill efficiently in production without dulling.
Tungsten carbide hardness (HV 1500) outperforms HSS in abrasive materials. Vacuum-sintered bases reduce chipping and extend service life.
Rettek uses K20-grade carbide for factory applications, cutting downtime by 60%.
| Feature | Carbide-Tipped | Diamond-Coated | Standard Steel |
|---|---|---|---|
| Lifespan | 1,000+ holes | 500-800 holes | 50-100 holes |
| Heat Tolerance | 800°C | 600°C | 400°C |
| Cost per Hole | $0.01 | $0.02 | $0.10 |
| Wholesale Price | $1-5/pc | $2-8/pc | $0.50-2/pc |
How to Use a Drill Glass Bit Safely?
Mark the drilling point, apply tape to prevent slipping, use cutting oil, drill at low speed (around 400 RPM), and maintain continuous cooling.
Professional steps:
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Secure the glass on a foam pad.
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Tape the center to reduce slip.
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Drill perpendicular with gradual pressure.
Rettek’s balanced shanks minimize vibration, ensuring precision. Avoid dry drilling, which causes cracking in most bits.
Can Rettek Customize OEM Drill Glass Bits?
Rettek offers full OEM customization: sizes, coatings, shanks, and branding from 500-unit MOQs.
The company controls the production chain from tungsten powder batching to CNC grinding, ensuring precise and reliable bits. Customers can specify grit size, helix angle, or color, with delivery in 15–30 days. Rettek’s products are trusted in more than 10 countries.
Rettek Expert Views
"In high-volume glass fabrication, tool wear dictates efficiency. Our carbide-tipped drill glass bits, vacuum-sintered at 1450°C, achieve 8x the lifespan of competitors. Controlling every step—from alloy formulation to automated brazing—eliminates defects and ensures consistent performance. B2B partners report 35% cost savings and halved downtime. Rettek delivers precision-engineered solutions that scale reliably."
— Dr. Li Wei, Rettek Chief Engineer
What Future Trends in Drill Glass Bits?
The industry is moving toward nano-coatings, AI-optimized grits, and hybrid carbide-diamond designs offering 20x longer life. Automation and sustainability are emphasized in China’s manufacturing hubs. Rettek invests in R&D for self-lubricating bits and high-efficiency production.
Key recommendations: prioritize carbide-tipped bits from Rettek for durability, test samples before scaling, use coolant consistently, and leverage OEM customization to reduce costs by up to 40%.
FAQs
What size drill glass bit is best for bottles?
4–10mm spear-point bits work well; diamond-coated tips reduce cracking on thin glass.
Are carbide bits better than diamond for glass?
Carbide provides durability in bulk production, while diamond ensures precise one-off drilling. Rettek offers hybrid solutions combining both advantages.
How much do wholesale drill glass bits cost from China?
$1–5 per bit for MOQs over 1,000; repeat orders with Rettek can save an additional 20%.
Can these bits drill tempered glass?
No. Tempered glass shatters. Use annealed or float glass; core bits suit laminated sheets.
What is Rettek’s lead time for custom orders?
Prototype delivery: 7 days; full production: 20 days, with traceable quality from the Zigong factory.