HSS Drill Bits
HSS drill bits are the ones you reach for when you're drilling steel, sheet metal, plastic, and timber without chewing through cheap bits by lunchtime.
If you're fitting trunking, drilling brackets, punching through box section or sorting snag work in metal and wood, decent hss drill bits save time and grief. They are standard Drill Bits for van stock because they cover a lot of day-to-day site drilling. Check the bit tip, shank type, and size range before you buy hss drill bits, especially if you're using drilling bits for cordless drills where control and sharpness matter. For trade users after reliable drill accessories that earn their keep, this is the place to get sorted.
What Are HSS Drill Bits Used For?
- Drilling steel trunking, metal brackets, conduit boxes, and fixings on first fix jobs is where hss drill bits earn their place, giving a cleaner start and less wandering than poor mixed sets.
- Working through sheet metal, aluminium, and plastic ducting on maintenance and install work is easier with hss drill bits because they cut cleanly without grabbing as badly as rough, worn bits.
- Opening out existing holes in plant covers, cabinets, and site-made metalwork is a common use, especially when you need a bit that stays true rather than chattering all over the job.
- Using drilling bits for cordless drills on lighter site work, van jobs, and snagging is ideal when you need controlled drilling without dragging out bigger kit for every fixing point.
- Keeping a proper range of professional drill bits in the van helps when the job changes from timber to metal fast, which is why hss drill bits are standard drill accessories for most trades.
Choosing the Right HSS Drill Bits
Match the bit to the material and the amount of drilling you actually do, not just whatever set looks biggest.
1. Jobbing Sets vs Individual Sizes
If you drill a bit of everything, a jobbing set makes sense and keeps common sizes in one place. If you burn through the same few sizes for fixing holes and bolt clearances, buy those singles in multiples so you are not stuck when the 6mm and 8mm are gone.
2. Straight Shank vs Hex Shank
Straight shank bits are standard and fine for most keyed and keyless chucks. If you are mainly using drilling bits for cordless drills and want quicker swaps on site, hex shank bits can be the better shout, especially for repetitive fitting work.
3. Coated vs Standard HSS
Standard HSS is right for general van stock and everyday metal, plastic, and timber jobs. If you are regularly drilling tougher materials or doing repeated runs in metal, coated bits are worth a look because they usually hold their edge longer when used properly.
4. Size Range Matters More Than You Think
Do not buy a set that tops out too small for the work you actually do. If you fit Unistrut, brackets, cabinets, or plant fixings, make sure the range covers your clearance holes so you are not opening them out badly with the wrong bit.
Who Uses These on Site?
- Sparkies use hss drill bits for drilling metal back boxes, trunking, switchgear panels, and brackets, usually on first fix and plant room work where a blunt bit just slows everything down.
- HVAC fitters and plumbers keep them handy for sheet metal, clips, covers, and support channel, especially when they are working overhead and need the bit to bite cleanly first time.
- Fabricators, maintenance teams, and site fitters rely on hss drill bits for enlarging holes, drilling mild steel, and sorting quick repairs without swapping to specialist gear for every task.
- Joiners and general builders use them as cross-over drill accessories for plastic, thin metal, and occasional timber drilling when one solid set covers the snag list better than a box of mixed cheap bits.
Useful Accessories for HSS Drill Bits
A few sensible extras stop broken bits, rough holes, and wasted trips back to the van.
1. Cutting Fluid
If you are drilling metal dry all day, expect heat, dull edges, and short bit life. A bit of cutting fluid keeps the bit cooler, helps it cut cleaner, and saves you wrecking good hss drill bits on routine steel work.
2. Centre Punch
This stops the bit skating across painted or smooth metal when you start the hole. You will be grateful for it when you are drilling awkward brackets or control panels and need the hole exactly where you marked it.
3. Bit Cases and Organisers
Loose drill accessories rolling around the van do not stay sharp for long. A proper organiser keeps sizes readable, stops chipped tips, and means you are not wasting ten minutes hunting for one 5mm bit.
4. Step Drills
For thin sheet and panel work, step drills are a smart partner to hss drill bits. They save you trying to force a standard twist bit to open holes too far and leaving a ragged finish in the process.
Choose the Right HSS Drill Bits for the Job
Use this quick guide to avoid buying the wrong bit for the work you do most.
| Your Job | HSS Drill Bit Type | Key Features |
|---|---|---|
| General van stock for mixed site drilling | Jobbing HSS set | Wide size spread, standard lengths, good for metal, plastic, and light timber jobs |
| Fast snagging and fixing work with cordless kit | Hex shank HSS bits | Quick bit changes, solid chuck grip, well suited to drilling bits for cordless drills |
| Repeated drilling in steel brackets and box section | Coated HSS bits | Better wear life, cleaner cutting when used at the right speed, good for heavier use |
| Opening out holes in thin sheet and panels | Smaller pilot bits then larger HSS sizes | More control, less grab, cleaner finish than forcing one large bit straight through |
| Replacing your most-used trade sizes | Single HSS bits | Cheaper than rebuying full sets, keeps core sizes ready for daily drilling |
Common Buying and Usage Mistakes
- Buying cheap mixed sets instead of proper hss drill bits usually means blunt tips, snapped smaller sizes, and rough holes. Spend on the sizes you actually use and the bits will last longer.
- Running the drill too fast in metal burns the cutting edge and leaves the bit polishing instead of drilling. Slow it down, keep steady pressure, and use cutting fluid where needed.
- Starting holes on smooth steel without a punch mark lets the bit skate and ruins accuracy. Mark it, punch it, then start with control rather than trying to force it.
- Using one large bit straight away on sheet metal often snatches and leaves a messy hole. Pilot first or step up through sizes if you want a cleaner result and less stress on the bit.
- Leaving professional drill bits loose in the van knocks the tips about and makes size selection a pain. Keep them organised and dry so they stay sharp and usable.
HSS Drill Bits vs Masonry Drill Bits vs Holesaws
HSS Drill Bits
These are your go-to for metal, plastic, and mixed light drilling jobs. They are the sensible choice for brackets, steel sections, cabinets, and everyday site drilling where accuracy matters.
Masonry Drill Bits
Use these for brick, block, and concrete, not metal. If the job is wall fixings or anchor points, switch to Masonry Drill Bits because HSS will not thank you for being pushed into masonry.
Holesaws
For larger diameter cuts in sheet, doors, panels, and timber, holesaws are the right tool. Go to Holesaws & Accessories when a twist bit would take too long or leave you fighting the job.
When to Step Up to SDS
If you are drilling concrete, chasing masonry, or working on tougher structural material, look at SDS Bits and Attachments. HSS drill bits are for cleaner metal and general drilling, not hammer drilling into hard site fabric.
Maintenance and Care
Clean Off Swarf After Use
Metal swarf and fine dust left on bits can hold moisture and start surface rust. Wipe them down after the job, especially if they have been used with cutting fluid.
Store Them Dry and Sorted
Keep hss drill bits in a case rather than loose in the van or tool bag. It protects the tips, stops sizes getting mixed up, and makes replacements easier to spot before you get caught short.
Watch for Heat Damage
If the bit has gone blue from heat, it has likely had a hard life and may not cut properly anymore. Ease off the speed next time and replace it if it is just rubbing rather than biting.
Replace Blunt Core Sizes Early
A tired 5mm or 6mm bit wastes more time than it is worth. The sizes you use daily should be replaced before they start wandering, overheating, or leaving ugly holes.
Use the Right Bit for the Material
Forcing HSS into brick or concrete just ruins the edge. Keep your metal drilling separate from your other Power Tool Accessories so the right bit gets used on the right job.
Why Shop for HSS Drill Bits at ITS?
Whether you need individual replacements, full jobbing sets, or dependable drill accessories for daily site work, we stock the full spread of hss drill bits in all the sizes and types trades actually use. It is all held in our own warehouse, in stock, and ready for next day delivery across the UK.
HSS Drill Bits FAQs
What are hss drill bits used for?
HSS drill bits are mainly used for drilling metal, including mild steel, sheet metal, aluminium, and brackets, but they also handle plastic and timber well enough for general site work. They are the everyday choice when you need one bit range that covers most fitting, maintenance, and snagging jobs.
How do I choose the right hss drill bits?
Start with the material, then look at the sizes you actually drill most. If you do mixed work, buy a decent set. If you always use the same few sizes, buy singles and keep spares. Also check whether you want straight shank or hex shank for your drill setup.
Which hss drill bits are best for trade drilling?
The best hss drill bits for trade drilling are the ones that match your actual workload. For everyday fitting and installation, a good jobbing set covers most bases. For repeated drilling in steel, go for better-grade bits or coated options and keep replacement sizes ready for the ones you use hardest.
Can hss drill bits be used with cordless drills?
Yes, hss drill bits work well with cordless drills, especially for light to medium drilling in metal, plastic, and timber. Just keep the speed sensible in metal and let the bit cut. For larger holes or thicker steel, a more powerful drill and proper technique will make a big difference.
Can I buy hss drill bits online from ITS?
Yes, you can buy hss drill bits online from ITS, including singles, sets, and other professional drill bits for site work. Stock is held in our own warehouse, so if it is showing available, it is ready to go with next day delivery options.
