Extra Reach for Deep & Difficult Machine Drilling
When a standard drill cannot reach the required cutting position, Sutton Tools Long Series Morse Taper Shank Drills provide the additional working length needed for deeper holes, thick steel sections & restricted machine setups.
Also searched as extra length Morse taper drills or long reach Morse taper drills, Sutton D140 drills combine HSS construction with a Morse taper shank for compatible machine-drilling applications. The range is built around practical selection factors including drill diameter, flute length, overall length & MT shank size.
Before choosing a drill, match the hole diameter, required drilling depth, machine taper & available clearance to the job.
Building out a fabrication setup? Explore Metal Fab. Kits or browse Cutting Tools for related metalworking tooling.
Where Long Reach Morse Taper Drills Make the Difference
Extra length has a specific purpose: getting the cutting edges to a position standard-length tooling cannot reach.
That can occur because of workpiece thickness, drilling depth, component geometry, fixturing or limited machine access.
Sutton Long Series drills are relevant to jobs such as:
► Deep-hole drilling in steel components
► Drilling thick plate & structural sections
► General metal fabrication
► Machinery manufacture
► Engineering workshop machining
► Equipment repair & overhaul
► Agricultural machinery maintenance
► Restricted-access drilling
► Industrial production & maintenance
Where the wider job requires cutting, grinding or material preparation, Metal Cutting & Grinding Tools can support the surrounding fabrication workflow.
What Is an HSS Morse Taper Shank Drill?
A Morse taper shank drill uses a tapered machine shank rather than the conventional straight shank commonly held in a drill chuck.
The taper is designed to locate into a compatible machine spindle, socket or sleeve, making the format particularly relevant to pedestal drills, machine tools & industrial drilling setups.
Sutton's D140 is an HSS Morse taper drill in Long Series configuration. The increased overall & flute lengths provide greater reach while maintaining the Morse taper connection to the machine.
Need a different drilling format? Compare the wider Drills range.
Sutton D140 Long Series – What to Check Before Ordering
The D140 range covers multiple diameters, lengths & Morse taper sizes rather than a single drill configuration.
Key Sutton specifications include:
► HSS construction
► Blue finish
► 118° point angle
► R30 helix
► Morse taper shank
► Maximum cutting depth of 8xD
► Suitability for materials up to 900 N/mm²
► MT1, MT2, MT3 & MT4 options across the published range
That variation matters. A buyer searching for an MT1 Morse taper drill, MT2 Morse taper drill or larger MT configuration still needs to check the individual drill dimensions rather than selecting by diameter alone.
How to Choose the Correct Long Series Drill
Match the Drill Diameter to the Hole
Begin with the required finished hole diameter.
Sutton's published D140 range includes numerous metric diameters, so check the individual item rather than assuming that adjacent sizes have identical lengths or taper configurations.
When accurate workpiece measurements are required before machining, Calipers (Digital / Manual) can support dimensional checking.
Calculate the Reach Required
For an extra length drill, both flute length & overall length matter.
Flute length relates to the usable cutting portion of the drill.
Overall length determines whether the drill can physically reach the required position within the machine setup.
More reach is not automatically better. If a shorter drill comfortably reaches the cut, reduced overhang will generally provide a more rigid setup.
Check the Morse Taper Size
Match the drill's MT size to the machine spindle, socket or compatible sleeve.
This is one of the most important checks when buying a Morse taper drill online because cutting diameter does not determine taper size.
Across Sutton's current D140 range, the taper changes as drill sizes increase. Always check the individual item specification.
Consider the Material Being Drilled
Sutton specifies D140 Long Series drills as suitable for materials up to 900 N/mm².
Actual drilling conditions still depend on the material, diameter, drilling depth, machine capability & cutting setup.
For buyers looking specifically for a Morse taper drill for steel, material strength & recommended cutting conditions should be checked before machining rather than relying on the HSS designation alone.
Check Machine Capacity & Workholding
Long-reach drilling puts greater emphasis on rigidity.
Confirm the machine can accommodate the drill dimensions, taper & intended operation then secure the workpiece appropriately.
For workshop workholding options, browse Clamps & Vises.
Long Series vs Standard-Length Drills
The correct choice depends on reach rather than assuming one format is universally better.
Choose Long Series when:
► A standard drill cannot reach the required depth
► A thick component requires additional working length
► Fixtures restrict access to the drilling position
► Component geometry requires greater tool reach
Choose standard length when:
► The shorter drill already reaches the complete cut
► Maximum rigidity is more important than additional reach
► Machine clearance does not require extended tooling
Using the shortest suitable drill helps minimise unnecessary overhang.
Workshop Techniques for Deep-Hole Drilling
Plan the hole before setting up the machine.
Check diameter, depth, workpiece position & available clearance before selecting the drill.
Keep the taper clean.
Inspect mating taper surfaces & remove swarf, dirt or contamination before fitting the drill.
Control unnecessary overhang.
A Long Series drill should be selected because its reach is required — not simply because a longer drill is available.
Set out the work accurately.
Correct measurement & marking reduce avoidable machining errors. Browse Measuring & Layout Tools for related workshop equipment.
Pay attention to chip evacuation.
Deep holes give swarf further to travel before leaving the flutes. Avoid allowing chips to pack into the hole & interfere with cutting.
Match speed, feed & lubrication to the application.
Drill diameter, material, depth & machine capability all affect appropriate cutting conditions.
Protect long drills between jobs.
Inspect the cutting edges & taper after use then store longer tooling where it cannot be knocked or bent. See Tool Maintenance Kit for supporting workshop maintenance products.
