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Professional Glass Drilling Services — Precision Holes for Industrial & Electronic Applications
From technologically advanced touchscreen cover glass to high-performance LED lighting panels, Saiwei Glass offers custom hole drilling to suit your niche requirement through its 16-year experience in glass deep processing and ISO 9001 certification, with all tolerances including ±0.05 millimeter and CNC precision, using the diamond tooling.
16+
Years in Glass Processing
1M+
Annual Capacity (pcs)
100+
Automated Equipment
±0.05mm
Drilling Tolerance
What Is Glass Drilling? — Methods, Materials & The Industrial Process
Glass drilling is a machining process for drilling holes of precise dimensions in glass substrates with tools, the dominant one being a diamond-tipped core drill. During drilling the tool remains in constant contact with the glass by rotating, with the core grinding the surface rather than cutting it by a chip-removal process. The greatly brittle glass polishes to dust the rare impact forces it may undergo—very unlike work with softer, ductile metals or plastics—using a low-pressure water coolant as the glass is machined at a constant rotation speed.
Where hobbyist use a power drill laid upon a controlled guide surface masked with a Tape, industrial production iterations employ CNC machining with through-spindle coolant sprinkling-and-suckling, automation controlling the feed rate, with drilling from both sides of the glass to suppress exit chipping, and can otherwise produce absolutely dead-on dimensioned, produce at break-neck production rates, hundreds or even thousands of pieces an operation shift.
Size and precision count because a drilled hole is necessarily the weak point of a structure—if the diameter, edge distance, or finish is even slightly off, it may arced when tempered, shattered in service; too large or too close, and the back edge of the hole will visibly chip from the force. Professional glass drilling must balance three facets at once: the precision of the hole, the finish of the surface roundabout, and throughput; every process parameter—the spindle-machining speed (usually 3000-8000 rpm per minute for glass), coolant nozzle flow, etc.—is tuned to what sort of glass matrix is being workthrough.
Why Professional Glass Drilling Matters for B2B Buyers
Drilling quality impacts directly on the performance of your finished fixture—whether they be electrical panels, industrial equipment, or architectural cladding. Even microscopic cracks—stressed to the limits by inappropriate coolant or feed rate, runny tooling—may sprout into microcrazing and fracture into failure under the impact conditions.
Types of Glass for Drilling: Soda-Lime, Borosilicate, Aluminosilicate & More
All glasses do not go ‘bong’ the same way; the inherent chemical constitution decide hardness, cure time, and cracking susceptibility—that’s why each type needs a dedicated tooling, speed, and coolant combination. Here’s what Saiwei Glass offer for different types of glass, and what each sort requires during drilling.
MOST COMMON
Soda-Lime (Float) Glass
Soda-lime is the mineral engineering work horse. This glass alone—comprising the constituent oxides is the easiest to drill, at a medium cutting speed; and it is also the cheapest for cover glass, lighting panels, and appliance skins. When used as the component layer through a tempering furnace, the resultant safety glass complies with EN 12150 by the basic polishing of holes, prior to dip into the bell.
Drill speed: 3,000–6,000 RPM
Thickness: 0.5–19mm
HIGH PERFORMANCE
Borosilicate Glass
With a substantially lower coefficient of thermal expansion, borosilicate offers aesthetic glassware excellent resistance to thermal shock and veder (“cracking due to reheating”) in the same manner as thermally stable body. It drills more slowly, with more stress on the diamond tools due to the higher hardness, but results in a very clean hole with virtually no chipping.
Drill speed: 2,000–4,500 RPM
Thickness: 0.7–12mm
PREMIUM
Aluminosilicate Glass
This way-off branded products as Corning Gorilla Glass, AGC Dragontrail are aluminosilicate—which is vastly harder than soda-lime—and therefore need CNC systems with anti-vibrate spindles, slow spindle and feed rate, harder diamonds—but awe-inspiring scratch resistance as well as ballistic strength after chemical strengthening.
Drill speed: 2,000–3,500 RPM
Thickness: 0.4–2.0mm
SPECIALTY
Low-Iron Ultra-Clear Glass
If you need optical transparency – premium displays, light fixtures, solar cells – low-iron glasses offer transmittance greater than 91%. Ferreting drill parameters out of the data sheet can be time-consuming; the rules are somewhat similar to regular soda-lime glass, but cleanliness and handling protocols are more stringent as due to visible fingerprints and micro-scratches the final piece must be inspected.
Drill speed: 3,000–6,000 RPM
Thickness: 2–15mm
Tempered Glass: Why You Must Drill Before Tempering
Tempered glass must not be drilled after the heating treatment. The stress layer formed by ion-exchange gives tempered glass up to 5 times the edge-strength of annealed pane, but also makes it explode if penetrated. According to EN 12150 and ASTM C1048, all holes and notches must be introduced before glass enters the tempering furnace. Back at the shop, drilling becomes part of the manufacturing line: cutting → edge grinding → CNC hole drilling → cleaning → tempering → coating → inspection → packaging.
Chemically-strengthened types follow the same principle. Ion-exchange processing produces a stress layer of no less than 450 MPa (DOL 8 μm) at Saiwei Glass, which will cause fracture if penetrated. Drill first, strengthen second – no compromise.
Glass Drilling Techniques: Diamond Core, CNC Machining & Laser Micro Drilling
Choosing a drilling method depends on your hole size, type of glass, dimensional accuracy desired, and production rate. Below are the 3 most common approaches in professional glass making and their advantages and disadvantages.
| Parameter | Diamond Core Drilling | CNC Glass Machining | Laser Micro Drilling |
|---|---|---|---|
| Hole Diameter Range | Ø4mm – Ø200mm | Ø0.5mm – Ø150mm | Ø0.01mm – Ø2mm |
| Position Tolerance | ±0.15mm | ±0.05mm | ±0.01mm |
| Diameter Tolerance | ±0.10–0.15mm | ±0.05mm | ±0.005mm |
| Best For | Standard holes, high volume | Complex patterns, tight tolerance | Micro holes, photonics, MEMS |
| Throughput | High (seconds per hole) | Medium (programmed paths) | Low (per-hole basis) |
| Glass Thickness | 0.5–25mm | 0.3–19mm | 0.1–3mm |
| Coolant Required | Yes — water flood | Yes — through-spindle | No (non-contact) |
| Edge Quality | Good (may need chamfer) | Excellent | Excellent (no chipping) |
| Cost Per Hole | Lowest | Medium | Highest |
Diamond Core Drilling: The Industry Workhorse
Diamond is still king in the production world of hole drilling in glass. A hollow cylindrical bit with industrial diamond particles bonded to it grinds a ring in the pane while water flushes through the hollow body to clear away debris while maintaining temperature. Sintered, metal-bonded diamond bits are the longest-wearing but cut slower, whereas electroplated bits cut faster but wear quickly; most shops keep both available to match the bit to volume.
A often-overlooked concern: part support on exit side, if only one drill point enters the bottom surface. Unsupported edge chip-out occurs because the hole is drilled from only one side. Today’s production level equipment is double-sided; two drills enter the glass, from opposite sides, and leave a perfect clean edge on both. When your application involves touchscreens or high-precision display panels, specify double-sided.
CNC Glass Machining: Precision for Complex Patterns
Bespoke hole patterns, cut-outs and slots and grooves, require CNC glass processing. Luckily a modern 3- or 5-axis CNC mill knows how to shape glasses with the same accuracy as a milling machines are made of metal: the through-spindle coolant system employed by Saiwei Glass means the entire run of 50,000 pieces can be machined in a single setup, eliminating damage from repositioning and ensuring very tight edge and surface features.
Laser Micro Drilling: For Holes Below 2mm
When regular diamond hole drilling cannot go any larger, laser micro drilling steps in. Femtosecond and picosecond laser technologies ablate glass with extremely low heat-affected zone (> 10 mm (0.01 mm) aspect ratio, < 10 mm2 hole area), resulting in holes down to 10 m (0.01mm). This process is ideal for the glass microfluidics industry, photonics and sensor applications.
Custom Glass Drilling for Industrial Applications
Saiwei Glass is a full service glass fabrication partner, providing custom glass drilling services for six principal industries. Our 16 years of glass processing know-how enables us to provide precision drilling for a broad spectrum of applications: from 2″ medical image displays to 86″ digital signage panels.
Touchscreen & Display Cover Glass
Button holes, sensor windows, speaker grilles, camera openings in industrial touch panel cover glass, POS terminals, ATMs and transportation HMI screens. Typical specs are 3-15mm diameter holes, 0.1mm tolerance, with AR/AG/AF coating applied after laser drilling.
Customers include: kiosk integrators, OEM sensor manufacturers, automotive electronics.
Smart Home & IoT Control Panels
Switch cutouts, socket openings, fingerprint reader apertures in smart home and building automation HMI panels. Many of these panels feature silk-screened icons and text, which must be precisely aligned with the drilled holes.
Clients include: building automation system specialists, IoT systems integration companies.
Medical Device Displays
Access holes, mounting holes for medical patient monitors, diagnostic screens, imaging diagnostics. Medical glass requires biocompatibility-compliant material and cleanroom handling. Saiwei Glass has a biocompatibility report applicable to our glass substrates.
Clients served: global medical equipment OEMs, diagnostic instrument makers
LED Lighting Glass
Cable entry and mounting holes in outdoor-rated tempered glass illuminator covers for landscape lighting, underwater lighting, pathway and landscape lights. These products are rated for outdoor exposure, so we use high temperature ceramic inks (fader-resistant) in combination with physical-tempering to produce IK07 impact-rated glass.
Clients served: architectural lighting brands, landscape lighting manufacturers
Household Appliance Panels
Holes in control panels for ovens, coffee machines, water systems. These types of appliance require high temperature silk-screen printing for permanent markings, chemical-strengthening for durability, and accurately-fitted holes to match underlying control circuit boards.
Customers include: SEB Group (Global Fortune500), SMEG, Ecovacs.
Automotive & Aerospace Displays
Instrument cluster window, head-up display cover panels, cockpit controls with mounting and mounting-feeder holes. Automotive glass users require reliable drilling through high volumes of product, total traceability, and documentation in PPAP format.
Clients served: Flex (Flextronics), automotive display integrators
Need Custom Drilled Glass for Your Project?
Provide your drawings or specs – our engineering staff will analyze and react with a detailed quote within 24 hours.
Get a Free QuoteGlass Drilling Specifications & Tolerance Standards
Reliability in laser drilling are three specifications: hole dimension tolerance, positional tolerance, edge quality. Information shows our capability with standard and advanced high-precision specs. All data is output from our inspection and control process using 2D gauging and tooling and two-dimensional measurement systems.
| Specification | Standard Grade | High-Precision Grade | Governing Standard |
|---|---|---|---|
| Hole Diameter Range | Ø4mm – Ø200mm | Ø0.5mm – Ø150mm | — |
| Diameter Tolerance | ±0.10 – ±0.15mm | ±0.05mm | Per UKAM diamond drill specs |
| Position Tolerance | ±0.15mm | ±0.05mm | CNC program verification |
| Min. Edge Distance (hole to glass edge) | ≥2× glass thickness | ≥2× glass thickness | EN 12150:2020 |
| Min. Hole-to-Hole Distance | ≥2× glass thickness | ≥2× glass thickness | EN 12150:2020 |
| Min. Hole Diameter | = glass thickness (min Ø4mm) | Ø0.5mm (CNC) | Industry practice |
| Glass Thickness Range | 0.5mm – 19mm | 0.3mm – 12mm | — |
| Surface Roughness (hole wall) | Ra ≤1.6μm | Ra ≤0.8μm | After chamfering |
| Chipping (exit side) | ≤0.3mm | ≤0.1mm | Double-sided drilling |
Critical Drilling Rules per EN 12150
European Norm EN 12150:2020 for toughened safety glass defines minimum requirements for holes in glass to be tempered:
Edge distance:
The minimum space from the edge of any hole to the edge of the glass must be at least 2 the glass thickness.
Hole spacing:
The minimum space from the edge of a hole to the edge of an adjacent hole must be at least 2 the glass thickness.
Manufacturing process:
all laser drilling must be complete prior to glass entering the tempering furnace. No modifications are permitted in the post-tempering process.
Edge quality:
the drilled holes must be free of cracks and chips or rough edges that could introduce stress risers during tempering.
These are not a nice-to-have, optional set of rules – if these edge-distance limits are not maintained the tempered glass will break without warning inside the tempering furnace or in worst case the panel will fail in the field, months or years later. Our CNC programmers have rule-checking embedded in our computer transfer program to make sure hole positions follow these guidelines before the first piece is drilled.
Our Glass Drilling Equipment & Production Capabilities
Saiwei Glass has more than 100 full automated equipment sets distributed over 3 factory sites; total production exceeds 1 million pieces per year of processed cover glass. Our drilling is carried out as part of an integrated finished glass deep processing line – a dedicated process, not a stand-alone operation.
Production Flow: From Raw Glass to Drilled, Finished Product
01
Cutting
Precision glass cutting to blank size
02
CNC Profiling
Edge grinding & shaping
03
Drilling
Diamond core / CNC hole drilling
04
Cleaning
Ultrasonic & 10-tank wash line
05
Printing
Silk-screen (high/low temp)
06
Tempering
Physical or chemical strengthening
07
Coating
AR, AG, AF, ITO treatment
08
Inspection
100% QC + packing
Key Equipment
CNC Machining Centers
Multiple-station CNC profiling and drilling combined machine with auto tool change. Drilling, profiling with edge grinding, notching and milling in one clamp, cycle time efficiency gains, minimum hole to edge accuracy.
Double-Sided Drilling Machines
Upper and lower diamond drill bits drill together from the two faces and meet at the position of the center of the glass. No exit-chip, which is extremely important in display cover glass where both sides are visible.
Physical Tempering Furnace
Continous tempering line with tight temperature control, 620-680 C zone, rapid cooling (turning the glass from 950-80 C to ambient in a series of cooling stations) to meet the EN 12150 fragmentation standard, minimum 100 fragments per 50x50mm area of 3mm thick glass.
Chemical Strengthening Bath
Ion-exchange strengthening of thin glass (0.4-8.0mm), minimum CS>450 MPa, DOL>8 μm. Critical for aluminosilicate cover glass for displays from smartphones to large industrial touch panels.
Glass Drilling Case Studies: From Cover Glass to Lighting Panels
If you want some detail of past projects, this print follow pages of three real examples of the kinds of problems we have to solve for our manufacturing customers.
Industrial Touch Panel — Precision Holes for a European Kiosk Manufacturer
Challenge:
Four mounting holes plus one home-button hole drilled on a chemically strengthened cover glass with AG coating. 0.08mm hole location tolerance. Previous vendor drilling caused micro-cracks that resulted in field failures after 6 months of outdoor thermal cycling inside kiosk enclosures.
Solution:
Sequence re-organization: CNC drill with through-spindle coolant, ultrasonic cleaning, AG etching, chemical strengthening, AF coating. Double-sided CNC drilling eliminated exit-chipping. Edge to hole and hole to hole position accuracy verified by a 2D dimensional inspection system before the panel was chemically strengthened.
Smart Home Switch Panels — High-Volume Drilling with Icon Alignment
Challenge:
A high-volume integrated switch and display panel used 1-4 exactly positioned holes for switch modules; the drill holes had to be aligned within 0.15mm of the silk-screen printed touch icons. Monthly volume ran through 50,000pcs across 12 separate SKUs with different hole pattern.
Solution:
CNC drilled all 12 SKUs on a common template, then produced corresponding silk-screen registration fixtures. The complete drill program shares the same coordinate grid as the print program, so the holes are within 0.15mm of the icons after the glass is drilled. The display icons are printed with ceramic ink designed to withstand finger oils for years without fading.
LED Pool Light Glass — Round Step Glass with Center Wiring Hole
Challenge:
This design specified a circular step-profile cover glass with one center hole for wiring pass through, tempered to withstand water blast forces and with impact rated IK07. The complication was the step profile created an asymmetric stress pattern during tempering and the center hole had to survive.
Solution:
Our engineering team performed finite element analysis to simulate stress distribution around center hole while undergoing tempering. We increased the hole edge distance to 3 glass thickness (not the minimum 2) for additional margin of safety. The tempered glass has successfully passed the hydrostatic pressure test at our facility prior shipping.
Quality Certifications & Glass Drilling Standards
Quality in glass drilling is not only about achieving acceptable diameter, but also material traceability, process control, and testing stringency. Saiwei Glass currently holds the following certifications, and adheres to these standards at all three manufacturing plants.
ISO
ISO 9001:2015
Quality Management System
EN
EN 12150
Thermally Toughened Safety Glass
BIO
Biocompatibility Report
Medical Device Glass Substrates
SEB
SEB Group Authorization
Fortune Global 500 Supplier
Testing & Inspection Equipment
All batches of drilled glass go through Saiwei’s quality control process, including:
Two-dimensional measurement. Confirms hole location, diameter and edge distance specifications of the drawing
Cross-cut adhesion test (ASTM D3359). Confirms ink adhesion on silk-screen printed panels – 4B rating required
Drop ball impact test. Confirms tempered glass meets impact resistance requirements
Salt spray test (ASTM B117). For outdoor rated products, tests coating and ink for corrosion resistance
BM-7 color analyzer. Measures color difference ΔE to confirm visual similarity batch to batch (acceptable: ΔE ≤ 1.0)
Stress tester. Monitors internal stress distribution in tempered and chemically strengthened glass
Hydrostatic pressure tester. For waterproof rated products (lighting glass, outdoor displays)
Glass Drilling Pricing: Key Cost Factors & OEM Advantages
Glass drilling costs vary widely by project specifications. Instead of printing a standard price list, here is a clear explanation of what is affecting your per-unit cost – and how working with a China-based OEM manufacturer offers a meaningful price advantage.
| Cost Factor | Impact on Price | How to Reduce Cost |
|---|---|---|
| Glass Type | Soda-lime = baseline; borosilicate +20–30%; aluminosilicate +40–60% | Use soda-lime where performance allows |
| Glass Thickness | Thicker glass = slower drilling = higher cost | Specify minimum viable thickness |
| Hole Diameter | Larger holes need bigger tooling; very small holes need CNC | Standardize hole sizes across SKUs |
| Number of Holes | More holes per piece = more cycle time | Combine with CNC profiling for efficiency |
| Tolerance | ±0.1mm = standard cost; ±0.05mm = premium (+15–25%) | Use tight tolerance only where functionally needed |
| Post-Processing | Tempering, coatings (AR/AG/AF), printing add cost layers | Bundle services with one supplier to reduce handling |
| Order Volume | Significant economies of scale above 1,000 pieces | Consolidate SKUs into larger POs |
OEM Advantages: Why Source Drilled Glass from China?
Saiwei Glass is proud to serve as an OEM glass drilling partner to leading brands and manufacturers worldwide. While true economies of scale can be achieved by lowering labor rates, the greater benefit to end consumers is working with a China-based OEM that runs a vertically integrated operation. Our manufacturing facility processes raw glass into finished glass components ready for installation or further assembly – all in a single factory that controls the entire vertical process. This reduces not only the cost of transportation that we’d pass on to you, but also shortens lead times and improves quality control.
Order minimums start at 100 pieces for standard configurations, making us a realistic proposition for startups iterating new concepts to established global manufacturers refining volume production.
After-Sales Support & Global Shipping
Overseas sourcing of glass components naturally raises considerations of communication, quality follow up, and shipping cost and lead time. Here is how we address each.
Response Time
Our team is available by email or phone in English and responds to all inquiries within 24 hours (business). Our factory line is accessible during business hours in China (GMT+8, 8:00-18:00).
Quality Guarantee
120% visual and dimensional inspection prior to dispatch. Besides inspection reports and photographs we provide with each batch, any defective items due to our manufacturing are replaced 1 for 1 with the next batch, free of charge.
Sample Program
Prototype and sample orders (10-50 pieces) completed within 3-5 business days. Samples are shipped express courier (DHL/FedEx) along with all relevant inspection data including dimensional reports to ensure specifications are correct before mass production.
Global Logistics
We ship all over the world via sea freight, air freight, express courier according to volume and destination. Glass is packed in vacuum packs with custom foam inserts to prevent breakage. Our DTSG facility is located just 20 mins from Shenzhen – one of the largest shipping ports in the world.
Glass Drilling Cost Estimator
Configure your glass drilling specifications below to see a relative cost index. Compare how glass type, thickness, holes, tolerances, and finishing affect per-unit cost.
Configuration
Cost Estimate
Relative Cost Index
1.00x
Your configuration is at baseline cost
0.5x
1.0x
2.0x
3.0x
4.0x+
Cost Breakdown by Factor
Volume Savings Available
*Relative cost index for estimation purposes only. Actual pricing depends on specific requirements, material availability, and production scheduling.
How This Estimator Works
This tool calculates a relative cost index for custom drilled glass. The baseline (1.00x) represents a standard configuration: soda-lime glass, 2 mm thick, one small hole, standard tolerance, at a mid-volume order of 1,001–5,000 pieces with no post-processing.
Each parameter you change multiplies the baseline. For example, switching to borosilicate glass (1.25x) with precision tolerance (1.2x) gives 1.25 × 1.2 = 1.50x the baseline cost before other factors.
- Glass type — specialty glasses like borosilicate and aluminosilicate require diamond-core bits and slower feed rates.
- Thickness — thicker glass increases drilling time, tool wear, and breakage risk.
- Hole count & diameter — more holes and larger diameters increase per-piece machining time.
- Tolerance — precision tolerance (±0.05 mm) requires CNC with optical feedback and tighter QC.
- Order quantity — higher volumes spread setup and tooling costs, reducing per-unit price.
- Post-processing — tempering, coatings, and printing add secondary operations and handling.
Start Your Glass Drilling Project Today
From 100 prototype pieces to 100,000 production pieces, our team will look at your specification and provide a highly competitive quote.
Get a Free QuoteFrequently Asked Questions About Glass Drilling
In general, the core-drilling of holes requires following rules: 1. hole diameter no smaller than the thickness of the glass; 2. Edge distance from the edge of the glass to the rim of the hole must be at least twice the glass thickness if drilled into edge; 3. center–to-center distance of adjacent holes must be at least twice the glass thickness; 4. all holes cut before conditioning must be drilled before tempering or chemically strengthening, not in the heat treat oven. 5. continuous water flow coolant is required to avoid thermal cracks on glass; 6. feed rate and RPM for the drill must be adjusted to the glass type – soda lime is faster than borosilicate.
About 4mm for soda-lime and 3mm for borosilicate using standard diamond core bits. Below 1mm you need CNC micro tooling or laser drilling. Our range covers 0.5mm to 200mm.
Most glass types are drillable prior to heat strengthening, including soda lime (float), borosilicate, aluminosilicate (Gorilla, Dragontrail), low-iron ultra clear, and chemically strengthened (drill first, then when ready for temper). Even laminated glass can be drilled as long as careful control of technology prevents delamination of the interlayer.
Crack elimination requires five factors: 1. continuous flow of water coolant on drill point, to cool and wash away chips; 2. steady, controlled feed rate, never forcing the drill through – ever!; 3. proper diamond-tipped core drill bits designed for use with glass; 4. proper support underneath drill side to prevent exit side chips – production machines drill from both sides; 5. critical edge distances for stress relief.
For standard diamond core drilling, ±0.10–0.15mm on diameters from 4mm to 50mm. CNC-controlled drilling tightens that to ±0.05mm when needed.
Yes, but only before the ion-exchange bath. The compressive stress layer (CS >450 MPa) shatters if you try to drill afterward. We handle the sequencing in-house.
Most industrial produced holes use some sort of diamond core drillbit. For high volumes a sintered metal bonded diamond bit will have the longest life, with the electroplated diamond bit cutting faster but wearing out more quickly, carbide tipped spear-points work well for low volumes of softer soda-lime glasses. Production work generally uses hollow through-spindle coolant diamond core bits for the cleanest holes.
