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Drilling a hole for a doorknob can be a tricky task, and it is important to measure and plan before starting. The standard bore hole size for a doorknob in Australia is 2 1/8 in diameter. A 25mm hole saw can be used to increase the width and depth of a latch hole, although it is important to use a guide to ensure the hole is drilled in the correct position. The Craftright Door Lock and Deadbolt Installation Kit is one option that includes a guide.
Characteristics and Values Table for Door Knob Hole Saws in Australia
| Characteristics | Values |
|---|---|
| Standard bore hole size | 2 1/8 inches in diameter |
| Bore hole size for latch installation | 1 inch |
| Cross bore size | 1 inch |
| Deadbolt hole size | 1 inch |
| Standard space between deadbolt and door knob | 5 1/2 to 6 inches |
| Door Lock Installation Kit | Craftright Door Lock And Deadbolt Installation Kit |
| Hole saw size | 25mm |
| Hole saw length | 40mm |
| Hole saw depth | 50-60mm |
| Hole saw guide | Yes, recommended for drilling in the correct position |
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What You'll Learn
Standard bore hole size
The standard bore hole size for door knobs is 2 1/8" in diameter. This is the most common size for door knobs, although there is variation, and some older door knobs used smaller holes. The bore hole is the large diameter hole where the door knob is mounted. Through the edge of the door, there is a 1" cross bore that extends from the edge of the door through the bore hole. This cross bore is where the latch is installed.
The standard dimensions for a deadbolt hole are 1 inch for the latch and 2 1/8 inches for the cross bore. Deadbolts generally do not have a drive-in latch, so these doors are usually prepped for either a rounded corner or square corner faceplate latch. The standard size for deadbolts tends to be around 2 1/8 inches, but there can be different case depths, ranging from 64mm to 76mm.
It is important to measure carefully and plan before drilling holes for door knobs and deadbolts. Many people have ruined doors by rushing into drilling without measuring or checking the positioning. It is recommended to check the specifications of the hardware, as deadbolt sizes can vary.
There are various tools available to help with drilling bore holes, such as a door lock installation kit, which includes a guide to help with drilling in the correct position.
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Deadbolt hole size
Drilling holes for door knobs and deadbolts can be tricky, especially when it comes to determining the width and depth of the holes. The standard size for a deadbolt hole is 2 1/8 inches in diameter, with a 1-inch cross bore. However, it's important to note that deadbolt sizes can vary, so it's recommended to check the specifications of the hardware before drilling any holes. The standard space between the deadbolt and the door knob is around 5 1/2 to 6 inches above the handle. This distance may need to be adjusted for non-standard door sizes, designs, or knob styles.
When installing a door knob and deadbolt, the first step is to make the bore holes. It's important to measure the door knob you've purchased to ensure you have the correct hole size and that it suits your door. The standard size for a bore hole is 2 1/8 inches in diameter. Once the bore holes are made, you can install the new hardware. Extend the bolt and rotate the front to stretch it out, then insert the deadbolt latch into the top hole of the door, ensuring it's inserted the right way around for a secure fit.
The depth of the deadbolt case can vary, typically ranging from 64mm to 76mm. The overall length of the deadbolt can also differ depending on the brand, ranging from 2 to 5 inches. When choosing a door knob, consider the size of the knob and the door itself to ensure a proper fit. It's important to take your time, measure carefully, and follow the installation steps to achieve the best finish and ensure the security of your door.
To bore the necessary hole for most deadbolts, a 1-inch hole saw is usually recommended. These hole saws are commonly included in door installation kits, offering a range of sizes to meet your specific requirements. With careful planning, measurement, and attention to detail, you can successfully install a door knob and deadbolt with accurately drilled holes, enhancing the security and functionality of your door.
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Door knob hole size
When installing a door knob, it is important to take your time and plan carefully. The standard bore hole size for a door knob in Australia is 2 1/8 inches in diameter. This is the large hole where the door knob is mounted. In addition, there is a 1-inch cross bore that extends from the edge of the door through the bore hole. This is where the latch is installed.
If you are drilling a new hole, it is recommended to use a door lock installation kit, which will allow you to drill in the correct position. These kits often include a range of different hole saws to suit your needs. You can also use a 25mm hole saw to drill a hole with a depth of around 50-60mm.
If you are drilling a new hole over an existing smaller hole, there are a few methods you can use. One method is to use a jig, which will cost around $25-$30 and can be found in hardware stores. Another method is to create your own guide by cutting a hole in a piece of plywood, clamping it to the door, and using it to guide your drill. You can also use a hole set, which involves putting a smaller hole saw inside a larger one, with a washer in between to provide better stability.
It is important to note that door knobs can vary in size, so it is recommended to check the dimensions of your door knob before drilling any holes.
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Enlarging an existing hole
When it comes to enlarging an existing hole for a door knob, there are a few things to consider. Firstly, it is important to measure the dimensions of the door knob you have purchased to ensure that the hole is enlarged to the correct size. The standard bore hole size for a door knob is 2 1/8 inches in diameter, but it is always good to double-check.
If the existing hole is too small, you may need to use a tool to enlarge it. One option is to use a door lock installation kit, such as the Craftright Door Lock and Deadbolt Installation Kit, which can help increase the width and depth of the hole. This kit includes a 25mm hole saw, which can drill to a depth of around 50-60mm.
However, if you are dealing with a pre-existing hole, you may need to use a different method. In this case, it is recommended to use an Irwin 25mm Speedbor Spade Drill Bit to clear out the end of the hole and accept the new latch's length. A hammer and chisel may also be useful for widening the hole, especially if the new latch is longer than the old one.
It is worth noting that enlarging a hole in a door can be tricky, and it may be easier to fill in the old holes and relocate the new door handle and latch to a new position. This way, you can create new holes without having to modify the existing ones too much.
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Door lock installation kits
When installing a door lock, it is important to measure carefully and follow the correct steps to ensure a secure fit. The standard bore hole size for a door knob in Australia is 2 1/8" in diameter. A 1" hole saw is usually recommended for the deadbolt, which will bore the necessary size hole for most deadbolts.
The RYOBI Wood Door Lock Installation Kit from Bunnings Australia includes a 50mm hole saw, a 25mm wood spade bit and guide, and bronze oxide drill bits (3/32” and 1/8”). The kit also includes a door lock bracket, backset and door thickness inserts, an arbor with a pilot bit, and a 2” double-ended screwdriver bit. The AutoStrike Locator™ feature easily aligns door and jamb holes and creates self-centred holes.
Milwaukee Tools, available at Total Tools, offers a range of heavy-duty and durable tools, including door lock installation kits. They are one of Australia's trusted sellers and biggest Milwaukee dealers, offering innovative products that deliver professional results. Their range of tools is built to power through the toughest tasks and includes corded, cordless, hand tools, and accessories.
When choosing a door knob, it is important to select one that suits the door. Planning is crucial before drilling the necessary holes, as door knobs are not always uniform.
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Frequently asked questions
The standard size of a door knob hole in Australia is typically 2 1/8 inches in diameter.
Yes, while 2 1/8 inches is the standard, door knob holes can vary in size depending on the specific door knob and door. It's important to check the dimensions of your door knob before drilling any holes.
A hole saw is a type of drill bit used for cutting large holes in wood or other materials. It consists of a saw-like blade attached to an arbor, which fits into a drill.
You can purchase a hole saw at hardware stores such as Bunnings Warehouse or online through websites like eBay or Amazon.
To enlarge an existing door knob hole, you may need a larger hole saw than the standard 2 1/8 inches. A 25mm hole saw is commonly mentioned for enlarging holes, but it's important to consider the depth of the hole and the specific requirements of your door and door knob.
