HSS Jobber, Twist Drills for Metal

Find out more about HSS Jobber, Twist Drills for Metal

HSS (High-Speed Steel) jobber twist drills are a popular choice for drilling metal due to their durability and versatility. These drills are designed with a tapered design and spiral flutes that help efficiently remove chips and debris while drilling.

One of the main advantages of HSS jobber drills is their ability to withstand high temperatures, making them suitable for various metal types, including steel, aluminium, and copper. The high-speed steel material ensures that the drills maintain their sharpness and structural integrity even under demanding conditions.

The twist design aids in creating a precise hole while minimising friction, which is crucial for maintaining the drill's longevity. Additionally, these drills come in various sizes, allowing for flexibility in different applications, from small precision tasks to larger drilling jobs.

When using HSS jobber twist drills on metal, it's essential to consider the appropriate speed and feed rate to achieve optimal results. Slower speeds are generally recommended for harder metals, while softer metals can handle higher speeds. Proper lubrication can also enhance performance and prolong the life of the drill.

Overall, HSS jobber twist drills are an excellent investment for anyone working with metal, providing reliable performance and versatility for a wide range of drilling tasks.

HSS Jobber, Twist Drills for Metal FAQs

What is an HSS jobber drill?

An HSS Jobber Drill is a versatile and commonly used drill bit made from High-Speed Steel (HSS), known for its durability and ability to withstand high temperatures without losing sharpness. “Jobber” refers to the bit’s length, which is typically around 8-12 times its diameter, making it suitable for a wide range of general-purpose drilling tasks.

Material: Made from high-speed steel, allowing it to handle high speeds and friction without dulling quickly. HSS is more resistant to heat than standard carbon steel, which extends its tool life and allows it to cut through harder materials.

Length and Versatility: The standard length of jobber drills makes them versatile for drilling deeper holes while maintaining stability and control.

Applications: HSS jobber drills are ideal for use on a range of materials, including wood, plastic, and soft to medium-hard metals like aluminium and steel. However, they are not as suitable for extremely hard or abrasive materials, where cobalt or carbide-tipped bits may be preferred.

Common in General Drilling: These drills are widely used in general construction, metalworking, woodworking, and DIY projects due to their balance of durability, length, and ease of use.

HSS jobber drills are cost-effective, durable, and excellent for everyday drilling tasks, making them a popular choice for professionals and DIYers.

What materials can HSS jobber drills be used on?

HSS Jobber Drills are versatile and can be used on a range of materials due to their durability and heat resistance. Here’s a list of materials they are well-suited for:

Soft Metals: They are commonly used on metals like aluminium, brass, copper, and mild steel. HSS can handle these materials without losing sharpness or overheating quickly.

Wood: HSS jobber drills work well on both hardwoods and softwoods, making them ideal for woodworking and cabinetry tasks.

Plastics: Suitable for drilling through various plastics, including acrylic and polycarbonate. Using lower speeds can help prevent melting or cracking.

Composite Materials: They can be used on softer composites like MDF and certain fibreboards, though cutting speed may need to be adjusted to avoid dulling the bit.

Some Stainless Steel Grades: While they can handle light drilling in stainless steel, HSS jobber drills may wear out quickly if used repeatedly on this harder metal. Cobalt bits are usually recommended for extended work with stainless steel.

These drills are an excellent choice for general-purpose applications but may not perform as well on hardened metals or abrasive materials like tile, concrete, or ceramics, which can require carbide or specialty bits.

What sizes do HSS jobber drills come in?

HSS Jobber Drills come in a wide range of sizes to accommodate various drilling needs. Here’s a breakdown of the most common size ranges:

Metric Sizes: Typically range from 0.2mm up to 25mm in diameter.

Commonly available in increments like 0.5mm (e.g., 1.5mm, 2.0mm, 2.5mm, etc.)

Larger sizes are less common but are available for specialised applications.

Imperial Sizes: Range from 1/64 inch to 1 inch in diameter.

Sizes are available in 1/64" increments for precise work (e.g., 1/16", 3/32", 1/8", etc.).

Numbered Sizes (Wire Gauge): Numbered drill bits range from #1 (0.228") to #80 (0.0135").

Common in North America, these bits offer precise, small-diameter options for detailed work or pilot holes.

Letter Sizes: Range from A (0.234") to Z (0.413").

Often used in metalworking and fabrication for specific drill sizes between numbered and fractional sizes.

These various sizing systems cover most drilling needs, from fine detail work to larger holes. HSS jobber drills are commonly sold in kits that include a range of sizes, which can be especially useful for general-purpose and professional work.

How do I choose the right size HSS jobber drill?

Choosing the right size HSS jobber drill depends on the material you're working with, the purpose of the hole, and the fit or fastener required. Here’s a guide to help you select the correct size:

Match the Drill Bit to the Fastener:

For screws, bolts, or rivets, choose a drill bit size slightly smaller than the outer diameter of the fastener for a snug fit.

If you’re tapping a hole (cutting internal threads), use a drill bit that matches the core diameter of the fastener. A tap drill chart can guide you in selecting the precise size.

Consider Pilot Holes for Larger Diameters:

For large holes or harder materials, start with a smaller “pilot” drill bit to guide the larger drill bit. This helps reduce strain on the larger bit and improves accuracy.

Drilling in Metal vs. Wood:

For metal, choose a bit size that matches the diameter needed exactly, as metals require precision.

For wood, you may choose a slightly larger bit size if the hole will be filled with a dowel or fastener that requires space for expansion.

Reference Measurement Charts:

Use metric, fractional, or wire gauge size charts to ensure precise measurements for specific applications.

A drill size gauge or guide can help you pick the right bit if you’re working with a specific tolerance requirement.

Account for Material Expansion:

When working with softer materials like wood or plastic, consider that some expansion may occur. In these cases, choosing a slightly smaller bit can give a tighter fit.

Choose Based on Hole Depth:

HSS jobber drills have a typical length-to-diameter ratio. Ensure the bit is long enough to reach your desired depth without over-stressing the bit.

With these guidelines, you can select the ideal HSS jobber drill size for your project, whether for general work, precise engineering, or DIY tasks.

What speed should I use when drilling metal with HSS jobber drills?

When drilling metal with HSS jobber drills, a good rule of thumb is to use a speed range of about 600 to 1,200 RPM, depending on the type of metal and the diameter of the drill bit. For harder metals, you might want to use a lower speed to prevent overheating and dulling the bit. Adjust the speed as necessary based on the specific material you're working with.

Do I need to use lubricant when drilling metal?

Yes, using lubricant when drilling metal is highly recommended. Lubricants help reduce friction and heat, which can prolong the life of your drill bit and improve the quality of the hole. Common lubricants include cutting oil or even some types of vegetable oil for lighter materials. Just apply a small amount to the drill bit or the surface of the metal before you start drilling.

Can HSS jobber drills be sharpened?

Yes, HSS jobber drills can be sharpened to extend their lifespan and maintain their cutting efficiency. Sharpening can be done using a bench grinder or a specialised drill bit sharpener. It's important to maintain the original angle of the cutting edge for optimal performance. Regular sharpening can help you get more use out of your drill bits.

What is the difference between jobber drills and other types of drill bits?

The main difference between jobber drills and other types of drill bits lies in their design and application. Jobber drills are versatile and typically have a longer length and a standard diameter range, making them suitable for general-purpose drilling in various materials, including metal and wood.

In contrast, other types of drill bits, like masonry bits, are specifically designed for drilling into hard materials like concrete, while spade bits are used for larger holes in wood. Each type of drill bit has its unique features tailored to specific tasks, so choosing the right one depends on the material and the size of the hole you need to create.

How do I store HSS jobber drills?

To store HSS jobber drills properly, keep them in a dry, cool place to prevent rust and corrosion. It's best to use a drill bit storage case or a magnetic strip to keep them organized and prevent damage. Make sure to avoid storing them loose in a drawer, as they can get nicked or dulled. If possible, you can also apply a light coat of oil to protect them further.

Are HSS jobber drills suitable for home use?

Yes, HSS jobber drills are definitely suitable for home use. They are versatile and can handle a variety of materials, making them ideal for general DIY projects and repairs around the house. Whether you're drilling into wood, metal, or plastic, jobber drills can provide the performance you need for most home tasks.