Precision Drilling, Chamfering & Hole Finishing

A clean hole starts with choosing the drill for the material—not sim  ply finding the right diameter. Sutton drill bits & countersinks cover precision drilling, countersinking, chamfering & deburring across fabrication, metalworking, maintenance, automotive & workshop applications.

Sutton's drilling range includes jobber, long-series, reduced-shank, panel, centre, step & other specialised drill formats. Different tool materials, point geometries, coatings, lengths & cutting profiles allow trades to select tooling around the material being drilled & the finished hole required.

For buyers building the complete drilling setup, Power Tool Accessories provides the broader accessory pathway, while Cutting Tools connects drilling with other workshop cutting applications.

Before comparing individual bits, answer four questions:

What material are you cutting? How deep is the hole? What diameter is required? What needs to happen to the hole afterwards?

What Are Drill Bits & Countersinks?

Drill bits remove material to create a hole.

Countersinks perform a different operation around an existing or newly drilled hole. Depending on the tool design, they can create a tapered recess for a countersunk fastener, produce a controlled chamfer or remove burrs left around a drilled edge.

That distinction matters.

A fabricator drilling a clearance hole through steel has a different requirement from a technician preparing the same hole for a flush-fitting countersunk screw.

Sutton's wider drilling range includes:

► Jobber drill bits
► Long-series drills
► Reduced-shank drills
► Panel & rivet drills
► Centre & spotting drills
► Step drills
► Carbide drilling options
► Drill/countersink combinations
► Countersinks & deburring tools

The goal isn't to own every format. It's to choose the geometry that suits the operation in front of you.

Why Choose Sutton Drill Bits & Countersinks?

Material Changes the Cutting Requirement

Steel, stainless steel, aluminium, brass & cast iron don't behave identically at the cutting edge.

Heat, hardness, chip formation, work hardening & required cutting conditions can influence the appropriate drill series.

Sutton offers drilling products across different cutting-tool materials, coatings & geometries. Selection should therefore follow the individual Sutton product specification & intended application, rather than assuming every Sutton drill bit suits every metal.

Drill Length Should Solve a Problem

Extra reach has a purpose.

A standard jobber drill provides a useful balance of reach & rigidity for many routine workshop holes.

Long-series tooling becomes relevant when the drilling point or required hole depth can't be reached with a standard-length tool.

If standard length reaches comfortably, unnecessary additional length doesn't automatically improve the job.

Countersinks Control the Final Edge

Once the primary hole exists, a countersink can perform the next operation.

That may mean creating a tapered recess for a compatible countersunk fastener, producing a chamfer or removing a burr.

Sutton's range includes 90° countersink options, drill/countersink tooling & dedicated deburring designs for appropriate applications.

Specialised Formats Exist for a Reason

A mechanic drilling panel material, a fabricator drilling stainless plate & a workshop producing deeper holes don't necessarily need the same tool simply because the required diameter is similar.

Tool geometry should follow the material, machine & finished-hole requirement.

Common Applications

General Metal Drilling

Jobber drills are widely used for routine workshop drilling because their proportions provide a practical combination of reach & rigidity.

Depending on the individual Sutton series, applications can include steel, stainless steel, aluminium, brass, cast iron & other suitable materials.

Where drilling forms part of a wider fabrication process, Metal Cutting & Grinding Tools provides a related pathway into cutting & material-preparation equipment.

Stainless Steel Drilling

Stainless steel deserves deliberate cutting-tool selection.

A drill that performs well in a routine general-purpose application isn't automatically the right option for repeated stainless work.

Appropriate drill construction, cutting geometry, speed, feed & lubrication can all matter. Excessive rubbing rather than effective cutting can generate unwanted heat & make the operation more difficult.

Sheet Metal & Panel Work

Thin sheet creates different drilling conditions from thick plate.

Depending on the required hole, panel, rivet or step-drill formats can offer a more appropriate approach than reaching automatically for a conventional long drill.

The desired finished hole should lead the selection.

Deep & Restricted-Access Holes

Long-series drills provide additional reach where standard-length tooling can't physically reach the drilling point or required depth.

Choose that extra length because the application needs it.

Countersunk Fastener Preparation

A countersink creates the tapered recess required for a compatible countersunk fastener.

The angle of that recess needs to suit the intended fastener & application.

Where drilling forms part of a fastening job, Bolts & Fasteners provides a related pathway into the hardware used after the hole has been prepared.

Chamfering & Deburring

A freshly drilled metal hole can leave a sharp burr around its edge.

A suitable countersink or deburring tool can remove that edge while creating a controlled chamfer.

This is a finishing operation—not simply another attempt to enlarge the hole.

Product Selection Guide

Work Backwards From the Finished Hole

Instead of choosing a drill because its diameter looks correct, define what the finished hole must do.

Ask:

► What material is being drilled?
► What finished diameter is required?
► Is the hole through or blind?
► How much reach is required?
► Is it a clearance, tapping or fixing hole?
► Does the edge need deburring?
► Will a countersunk fastener sit in the hole?
► What machine will drive the tool?

These questions narrow the range more effectively than comparing drill sets by piece count alone.

Step 1: Identify the Material

General steel: appropriate HSS drill families can suit many routine workshop applications.

Stainless steel: investigate a Sutton series specifically specified for stainless & use appropriate cutting conditions.

Aluminium & brass: cutting geometry, chip evacuation & the particular alloy still matter.

Cast iron: confirm the individual drill's stated material suitability.

Don't transfer suitability from one Sutton drill family to another without checking its specification.

Step 2: Choose the Drill Format

Use this as a shortlist, then confirm the individual Sutton tool specification.

Step 3: Determine What Happens After Drilling

A hole is often only one stage in the job.

It might subsequently be:

► Tapped
► Reamed
► Countersunk
► Deburred
► Used as clearance for a bolt
► Used for a rivet or other fixing

The next operation can influence the required drilled diameter & finish.

For accurate marking, positioning & dimensional checks, Measuring & Layout Tools provides complementary workshop equipment.

Step 4: Consider the Cutting-Tool Material

HSS, cobalt-containing HSS & carbide shouldn't be treated as simple good-better-best categories.

HSS provides a versatile cutting-tool material across many general drilling applications.

Cobalt-containing HSS can be useful in demanding metalworking applications where the particular drill series is specified for the material.

Carbide brings different wear, rigidity, machine & application considerations.

Choose according to the workpiece, machine, cutting conditions & individual Sutton product—not the material name stamped on the packet alone.

Step 5: Check Point Geometry

Drill-point design influences how the cutting tool starts & enters the workpiece.

Some Sutton drill families use split-point geometry intended to reduce wandering during starting.

That feature varies by product family, so check the individual tool rather than assuming every Sutton drill has the same point angle or geometry.

Step 6: Treat Countersink Angle as a Specification

A countersink is more than a large cutting diameter.

Where it is creating a recess for a fastener, the angle needs to suit the required screw-head geometry.

Sutton offers 90° countersink products for appropriate applications.

If the objective is only to remove a sharp burr, select the tool around that finishing operation rather than automatically using the same countersink chosen for screw seating.

Drill Selection in the Real Workshop

Sometimes the fastest way to narrow the range is to describe the problem.

“I need a routine hole through mild steel.”
Start with the appropriate general-purpose drill family.

“We're repeatedly drilling stainless.”
Move material suitability, cutting conditions & drill construction higher up the decision.

“The standard bit physically won't reach.”
Investigate long-series tooling.

“I need a larger drilling diameter but the machine setup limits the shank.”
A suitable reduced-shank drill may deserve consideration.

“The hole is drilled but the screw head needs to sit flush.”
The next operation is countersinking.

“The hole is correct but its edge is sharp.”
The next problem is deburring.

“The drill keeps moving as it starts.”
Review marking, workholding, starting technique & drill-point geometry before assuming diameter is the issue.

That is why drill selection works better when you begin with the finished hole rather than the tool cabinet.

Expert Tips

Use Only as Much Reach as the Job Requires

Long-series drills solve access & depth problems.

Where a standard-length drill reaches comfortably, its shorter geometry can provide a more rigid setup.

Stainless Needs the Tool to Keep Cutting

Rubbing instead of cutting can generate unwanted heat.

Use a drill series suitable for the material, appropriate machine settings & suitable cutting fluid or lubricant where required by the operation.

For related metal-preparation work, Complete Guide Abrasive Cutting Grinding Discs explores why cutting products should be selected around material & task.

Secure the Work Before Increasing Pressure

If the workpiece moves, better drill geometry won't fix the setup.

Use suitable workholding for the operation. Clamps & Vises provides a related pathway for controlling workpieces during workshop tasks.

Don't Turn a Large Drill Into an Improvised Countersink

Using an oversized drill simply to break an edge can give less control over the finished recess.

A dedicated countersink provides geometry intended for countersinking or deburring.

Read the Chips & Listen to the Cut

Changes in chip formation, cutting sound, required feed pressure or surface finish can signal that cutting conditions or tool condition need attention.

Experienced operators don't judge a drill only by whether it is still rotating.

Know When a Cutting Edge Has Reached Its Limit

A worn drill can increase cutting pressure, heat & hole-quality problems.

The Black Print: Blade Sharpening 101 Sharpen Or Replace explores the broader workshop decision between maintaining cutting edges & replacing worn tooling.

Give Cutting Tools Better Than a Loose Drawer

Drill edges knocking against other tooling can make identification harder & potentially damage working edges.

Tools Storage & Organization provides options for keeping workshop tooling organised.

For the wider maintenance picture, How To Clean Your Gear Without Ruining It covers practical equipment-care principles.