Trouble drilling steel ? Useful and informative information to help drilling steel easier

Commom mistakes and misinformation can make drilling steel a bad experience !

Trouble Shooting

Bit becomes very hot - penetration slows
Add lubricant - Reduce Speed

Bit makes squealing noise
Reduce speed

Bit Slides across metal surface
Drill a pilot hole - Make larger punch hole

Bit 'grabs' as it breaks through
Reduce pressure - Reduce speed

Drill Bit wobbles
Check to ensure bit is positioned correctly in the chuck, Check to ensure bit is not damaged

Designed and developed from feedback from engineers in workshops. TTP Hard Drills are able to drill harder metals where a normal HSS drill bit can not come close.

Steel Drilling 5 Top Tips

Where precise drilling depth is needed always use a depth stop

As your drill breaks through the far side ease up on pressure to prevent the drill bit ‘grabbing’

Buy the best drill bits you can justify

On harder Metals do not force the drill bit into the metal as this may cause excessive friction and heat to be generated reducing efficiency of drill bit – instead ease off pressure, use lubricant / cooling paste and reduce speed.

For larger holes drill a ‘pilot’ hole first (3 or 4mm is ideal), then change to larger bit. If you require a hole of around 12mm it may be easier to use an intermediate size like an 8mm first.

Designed and developed from feed back from engineers in workshops TTP Hard Drills harder metals where a normal HSS drill bit can not come close.

Steel Drilling - How to Drill Metals

Top Tips

Use a vise or other method to secure the metal you will be drilling.

A Hole Punch ensures an accurately locate hole and eliminates the possibility of the drill slipping.

Buy the best drill bits you can justify

Identify Metal properties before drilling

Use Cutting Paste or other lubricant to dissipate heat from the drill tip ,Safety goggles (not glasses) must be worn to  prevent slivers of metal entering your eyes

Drill slowly

Drill a short distance then remove the drill bit from the hole, this will help remove cut metal, add lubricant before progressing.

Choose cutting speed (see cutting speed chart)

Designed and developed from feed back from engineers in workshops TTP Hard Drills harder metals where a normal HSS drill bit can not come close.

135° Split Point v Standard HSS 118° Angle points

Better Experiences 135° Split Point Drill Bits

Industry standard HSS 118° angle point drill bits
Standard Industrial HSS drill bits have a 118 degree angle point and is designed as an all pur pose point and will cut most materials. These drill bits have two cutting edges and also have a drill point (the chisel point) which does not cut but ‘chisels’ the material being drilled.

TTP Hard Drills - 135° split point drill bits
Split Point drill bits are designed to cut metal. A Split point bit has two additional edges ground into the chisel edge which makes the entire point of the bit one long cutting edge thereby reducing the amount of pressure required to perform the cut.


TTP cobalt HARD DRILLS are designed to drill through the toughest and hard, abrasive materials they are ideal to use to drill into stainless, steel, titanium, cast iron, spot welds, leaf springs.

Cobalt makes the drill bit incredibly hard, with a abrasion quality, TTP HARD DRILLS cobalt drills are superior for their heat restistance

135 Degree Split Point - Makes entire point of the bit one long cutting edge.

Superior Hardness due to Tungsten and Molybdenum base

High Temperature Resistance due to addition of Cobalt

Can be Re-Sharpened several times

Impressive Guaranteed results when drilling hard alloys

If you are repeatedly drilling steel and hardened metals and are looking for a faster and easier way - HARD DRILLS

Drilling Out Sheared Bolts & Studs

Snapped or Sheared Bolt? How to drill out the bolt

Top Tips

Find the centre of the bolt - "eye ball" the centre and dimple with a centre punch

A Start with a small drill bit and drill the length of the bolt

Enlarging the hole with bigger and bigger drill bits. Stop the very instant you see that you are getting into the threads

Mount a small stone, carbide burr, or diamond burr in a Dremel-type rotary tool.

Slowly, grind out the rest of the bolt to the point where you see the threads start to show all the way around the periphery of the hole

Use a tap to clean out the hole; or, dig the threads out with a scribe or some other sharp-pointed tool. FINISHED!

WARNING! easyouts can cause more problems esp when they get stuck! if the bolt was stuck hard enough to break off bolt head. then drilling a hole for an ez out will probably not work. likely end up with a broken ez out inside your bolt. then you have a bigger problem of having a hardened tool broken inside your bolt.

Start small - drill dead centre - drill slowly - keep the heat down (use a cooling cutting lube like TTP Cut-it ) Increase the bit size to the threads start to appear - tap or dig the remains of the thread out - done!

Customer with a broken bolt or two!

"Caterpillar 345C excavator final drive sprocket bolts (the fkers snapped due to being installed with T1) while removing the bolts with an inch drive air gun, rather than undo they snapped off - how do you sell that. Anyway The repair is the removal of the broken bolts that hold a sprocket onto a final drive - machine Caterpillar 345C" - Matt - Elms

drilling out broken steel sprocket bolt

how to drill a broken bolt out

An easier way of drilling steel and harden alloys.
Best cobalt drill bits for drilling toughened steel and harder alloys - See more at:

Video Item

Now see how TTP Hard Drills or ideal for drilling harder steels and alloys -like stainless steel more details on drilling stainless steel