Tempered Glass with Hole Manufacturer | Pre-Drilled Safety Glass for Railings and Hardware

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KINGSTAR GLASS

Tempered Glass with Hole | Pre-Drilled Safety Glass for Hardware Integration from KINGSTAR BUILDING GLASS

KINGSTAR BUILDING GLASS Tempered Glass with Hole is a pre-drilled safety glass product engineered for architectural applications requiring hardware integration through the glass panel. All holes, notches, and edgework are machined into the glass prior to the thermal tempering process, as tempered glass cannot be cut, drilled, or modified after heat treatment. The thermal tempering process—heating the glass to approximately 620-700°C followed by rapid cooling—creates compressive stress on the sur

Product Detail

What is Tempered Glass with Hole?

Tempered glass with hole is a safety glass product where holes, notches, or cutouts have been machined into the glass prior to the thermal tempering process. The tempering process involves heating the glass to approximately 620-700°C and then rapidly cooling it with high-pressure air jets. This creates compressive stress on the surface and tensile stress in the interior, resulting in glass that is approximately four to five times stronger than annealed glass.

All fabrication—including cutting to dimensions, edgework, drilled holes, and notching—must be performed before strengthening or tempering. Once glass has been tempered, it cannot be cut, drilled, or modified in any way; any attempt to alter tempered glass will cause it to shatter completely.

Important: Tempering vs. Drilling Sequence

It is critical to understand that holes must be drilled before tempering. The correct sequence is:

Glass is cut to final dimensions.
Holes are drilled, edges are ground, and all fabrication is completed.
Glass undergoes thermal tempering.
Finished tempered glass with holes is delivered.

Tempered glass cannot be drilled after tempering. Any attempt to drill, cut, or modify tempered glass after heat treatment will cause the glass to shatter instantly.

Hole Placement Requirements

KINGSTAR BUILDING GLASS follows strict hole placement guidelines to ensure structural integrity and safety. All dimensions are based on industry standards including ASTM C1048 and EN 12150.

Minimum Distance from Hole Rim to Glass Edge
The minimum distance from the rim of a hole to the nearest edge of the glass must be 1/4 inch (6mm) or 2 times the glass thickness, whichever is greater .

Glass Thickness	Minimum Edge Distance
4mm (5/32')	8mm
5mm (3/16')	10mm
6mm (1/4')	12mm
8mm (5/16')	16mm
10mm (3/8')	20mm
12mm (1/2')	24mm
15mm (9/16')	30mm
19mm (3/4')	38mm

Minimum Distance Between Adjacent Holes
The minimum distance between the rims of adjacent holes must be 3/8 inch (10mm) or 2 times the glass thickness, whichever is greater .

Minimum Distance from Hole to Glass Corner
Holes in the vicinity of a corner must be positioned so that the nearest edge of the hole is a minimum distance of 6.5 times the glass thickness from the corner .

Minimum Hole Diameter
Circular holes shall have a minimum diameter of 6mm (1/4 inch) or the thickness of the glass, whichever is greater .

Maximum Hole Diameter
The maximum diameter of a hole should not be more than 1/3 of the narrowest dimension of the glass piece.

Hole Diameter Tolerance
Tolerance for hole diameter is ±1.6mm (±1/16 inch).

Hole Position Tolerance
Tolerance for the location of the hole from the specified edge is ±1.6mm (±1/16 inch).

Hole Types

Hole Type	Description	Typical Applications
Straight (Cylindrical) Hole	Uniform diameter through entire thickness	Standard bolted connections, standoff fittings
Countersunk Hole	Wider diameter at surface to recess bolt head	Flush hardware mounting, frameless systems
Counterbored Hole	Stepped hole for bolt head or nut recess	Point-supported glazing, structural connections

Key Features

Pre-drilled for hardware integration: Holes machined before tempering for precise fit.
High strength: Tempered glass offers approximately 4-5 times the strength of annealed glass.
Safety breakage: Upon impact, fractures into small, blunt-edged granules.
Precision tolerances: Hole diameter tolerance ±1.6mm, position tolerance ±1.6mm.
Multiple hole types: Straight, countersunk, and counterbored options available.
Code compliant: Meets EN 12150 and ASTM C1048 standards.
Multiple thickness options: Available from 4mm to 19mm.
Custom configurations: Custom hole patterns, sizes, and positions available.

Technical Specifications

Parameter	Specification
Glass Type	Float Glass, Low-Iron Glass, Tinted Glass
Thickness Range	4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm
Maximum Size	Up to 3300mm × 6000mm (varies by thickness)
Minimum Hole Diameter	6mm or glass thickness, whichever is greater
Maximum Hole Diameter	Not more than 1/3 of narrowest glass dimension
Hole Diameter Tolerance	±1.6mm (±1/16 inch)
Hole Position Tolerance	±1.6mm (±1/16 inch) from specified edge
Minimum Edge Distance	6mm or 2 × glass thickness, whichever is greater
Minimum Hole-to-Hole Distance	10mm or 2 × glass thickness, whichever is greater
Minimum Corner Distance	6.5 × glass thickness
Hole Types	Straight, Countersunk, Counterbored
Glass Colors	Clear, Ultra-Clear Low-Iron, Grey, Bronze, Green, Blue
Edge Finishing	Flat Polish, Pencil Polish, Beveled Edge
Available Configurations	Monolithic Tempered Glass
Processing (Before Tempering)	Cutting, Edge Grinding, Drilling, Notching
Processing (After Tempering)	None (no further fabrication possible)
Tempering Standard	EN 12150-1
Safety Classification	EN 12600 (Class 1B1)
Fabrication Standard	ASTM C1048
Certifications	ISO 9001, CE
Lead Time	10 to 20 days after order confirmation and drawing approval
Packaging	Protective film, edge protectors, hole protectors, interleaving paper, seaworthy wooden crates

Applications

Frameless Glass Railings and Balustrades:

Balcony railings and terrace guards
Staircase balustrades (internal and external)
Pool fencing and enclosures
Rooftop garden barriers

Point-Supported Glazing Systems:

Glass facades and curtain walls
Glass canopies and entrance covers
Glass roofs and skylights
Structural glass walls

Architectural Hardware Integration:

Glass doors with pivot or hinge hardware
Glass partitions with mounting brackets
Display cases and showcases
Glass stair treads with supporting brackets

Commercial and Public Spaces:

Hotel and hospitality railings
Shopping center barriers
Office building entrances and atriums
Sports facility railings
Airport terminal glazing

Why Choose KINGSTAR BUILDING GLASS Tempered Glass with Hole?

Precision drilling: Holes drilled before tempering with tolerances of ±1.6mm.
High strength: Tempered glass offers approximately 4-5 times the strength of annealed glass.
Safety certified: Meets EN 12150, EN 12600, and ASTM C1048 standards.
Multiple hole types: Straight, countersunk, and counterbored options available.
Hardware-ready: Precision holes for bolts, brackets, and structural connections.
Complete processing: Cutting, drilling, edge finishing, and tempering under one roof.
Custom configurations: Custom hole patterns, sizes, and positions available.
10 years of industry expertise: With a decade of dedicated experience in glass manufacturing and export, KINGSTAR BUILDING GLASS has delivered pre-drilled tempered glass solutions to projects across North America, Europe, the Middle East, and Southeast Asia.
Quality assurance: Strict quality control from raw material selection to final packaging, ensuring precise hole positioning, clean edges, and reliable processing.

Ready to specify pre-drilled tempered glass for your next railing or facade project? Share your requirements and drawings with our technical team for custom tempered glass with hole solutions. We will provide hole layout recommendations, hardware compatibility guidance, compliance documentation, and a competitive quote tailored to your project requirements, backed by a decade of glass manufacturing expertise.

Frequently Asked Questions (FAQ)

Q1: Can holes be drilled in tempered glass after the tempering process?
A: No. All holes, notches, and cutouts must be drilled into the glass before the thermal tempering process. Tempered glass cannot be cut, drilled, or modified after heat treatment. Any attempt to drill tempered glass will cause it to shatter completely. This is why all hole specifications—including diameter, position, and type—must be provided before production begins.

Q2: What is the minimum distance between a hole and the edge of the glass?
A: The minimum distance from the rim of a hole to the nearest edge of the glass must be 1/4 inch (6mm) or 2 times the glass thickness, whichever is greater. For example, for 10mm glass, the minimum edge distance would be 20mm. The minimum distance from a corner to the edge of a hole must be 6.5 times the glass thickness.

Q3: What hole diameters and tolerances are available?
A: KINGSTAR BUILDING GLASS offers hole diameters from 6mm upward, with the maximum diameter not exceeding 1/3 of the narrowest dimension of the glass piece. Hole diameter tolerance is ±1.6mm (±1/16 inch). Hole position tolerance from the specified edge is also ±1.6mm (±1/16 inch). Counter-sunk and counter-bored hole options are available upon request.

Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such stresses cause the glass, when broken, to shatter into small granular chunks instead of splintering into jagged shards as ordinary annealed glass does. The granular chunks are less likely to cause injury.

No tong marks on the glass as adopts the horizontally tempering process.

5 times harder than ordinary annealed glass.

Once breakage occurs, the glass disintegrates into small cubical fragments which are relatively armless to human body.

It withstands abrupt change of temperature. For example, a piece of 5mm tolerate the temperature variations within the range of 200°C.

Tempered glass should under go heat soak test to improve safety in use.

Thickness: 3-19mm

Size: Min size 300*200mm,Max size 3300*15000mm

Tempered glass is used for its safety and strength in a variety of applications, including passenger vehicle windows, shower doors, aquariums, architectural glass doors and tables, refrigerator trays, mobile phone screen protectors, bulletproof glass components, diving masks, and plates and cookware.