Match the Tap to the Hole Before Cutting the Thread
A tap doesn't know whether there's open space beneath the thread or a solid bottom waiting for the chips. Sutton JIS uncoated taps give machinists, fitters, fabricators & maintenance workshops different cutting geometries for producing internal threads, including gun-style taps for suitable through holes & spiral-flute options for blind-hole work.
Before the tap enters the component, the tapping hole needs to be right. Sutton Tools | Drills - Jobber Coated provides a closely related drilling option for hole preparation, while Drill Bit Sets can support workshops that regularly prepare multiple tapping diameters.
Don't choose the tap from the thread size alone. First ask where the chips are supposed to go.
What Are Sutton JIS Uncoated Taps?
Sutton JIS uncoated taps are internal thread-cutting tools made to JIS-style dimensional requirements across applicable products.
JIS describes the tool standard or dimensional format.
It doesn't mean “uncoated”, nor does it tell you whether the tap is spiral point or spiral flute.
Those are separate specifications.
Within the collection, buyers may encounter gun/spiral-point taps alongside R40 spiral-flute taps, with different geometries intended to manage chips in different types of holes.
That distinction matters because tapping creates chips as the thread is cut.
Where those chips travel can determine whether a tap cuts cleanly or ends up fighting material trapped inside the hole.
Why Choose Sutton JIS Uncoated Taps?
Through Holes & Blind Holes Present Different Problems
A through hole has an exit.
A blind hole doesn't.
That simple difference changes how chip control should be approached.
Spiral-point or gun-style taps are commonly used to direct chips forward through suitable through holes.
Spiral-flute taps are designed to draw chips back towards the entry of suitable blind holes.
Choosing between them should begin with the component—not the appearance of the tap.
Uncoated Doesn't Mean Unspecified
The absence of a performance coating doesn't remove the other characteristics that determine how a tap works.
Consider:
► Tap style
► Thread size
► Thread pitch
► Hole type
► Cutting-tool material
► Workpiece material
► Tapping-drill diameter
► Required thread depth
► Machine or tapping method
The complete specification matters more than a single word on the product description.
JIS Is a Standard, Not a Cutting Style
Two JIS taps can perform different jobs.
One may use spiral-point geometry.
Another may use spiral flutes.
The JIS designation shouldn't replace checking the actual cutting geometry & application.
Common Applications
Threading Through Holes
When the drilled hole passes completely through the component, chip movement can continue beyond the cutting zone.
Gun or spiral-point tap geometry can take advantage of that available exit by directing chips forward during suitable applications.
This makes through-hole geometry a natural starting point when comparing taps.
Cutting Threads Into Blind Holes
A blind hole ends inside the component.
There is nowhere underneath for chips to escape.
Spiral-flute geometry can help move chips back towards the opening during suitable blind-hole tapping operations.
That makes chip space, thread depth & drilled-hole depth particularly important.
Fabricated Brackets & Assemblies
Threaded brackets, mounting plates & fabricated components often require a tapped hole so a fastener can engage directly with the component.
Once the internal thread is complete, Bolts & Fasteners provides related hardware for the assembly stage.
Repairs & Workshop Maintenance
Replacement components, machinery repairs & modifications can all require new internal threads.
In repair work, identifying the existing thread correctly becomes especially important because nominal diameter alone doesn't establish pitch.
Small Precision Threads
The live JIS assortment includes small metric thread sizes where drilling accuracy becomes increasingly important.
A small error in tapping-drill diameter leaves less room for correction once the tap begins cutting.
For checking hole location, dimensions & setup before threading, Measuring & Layout Tools supports the preparation stage.
Product Selection Guide
Start With One Question: Does the Hole Come Out the Other Side?
This is the fastest useful split.
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Hole Situation
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Tap Direction to Consider
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Why
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Open through hole
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Gun / spiral-point tap
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Chips can be directed forward
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Blind hole
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Spiral-flute tap
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Chips need to return towards the entry
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Shallow blind thread
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Check lead, flute style & available chip space
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Bottom clearance becomes critical
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Existing threaded component
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Confirm diameter & pitch before selecting
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Similar diameters can use different pitches
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Repeat machine work
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Check tap style, alignment & operating setup
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Consistency depends on the whole process
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This isn't a substitute for the individual Sutton specification, but it gives buyers a much better starting point than choosing from thread diameter alone.
Then Confirm Diameter & Pitch
“M10” doesn't finish the specification.
Pitch matters.
Before selecting the tap, establish:
► Nominal thread diameter
► Thread pitch
► Required thread depth
► Hole type
► Workpiece material
► Required fit or thread specification
A tap with the correct diameter but wrong pitch is still the wrong tap.
The Tapping Drill Is Part of the Threading Toolchain
A tap can't correct a badly prepared hole.
The drilled diameter determines how much material remains for the tap to cut.
Too small a tapping hole can increase cutting load.
Too large a hole can reduce the resulting thread engagement.
Use the drill diameter specified for the thread & tapping conditions rather than selecting a drill by approximation.
For general drilling equipment around hole preparation, Drills provides the broader driving-tool range.
Blind Holes Need More Depth Than the Finished Thread
A blind threaded hole isn't simply drilled to the required thread depth & stopped.
Space may also be required for the tap's lead, chip accumulation & clearance below the usable thread.
Check the component design & tapping process before drilling.
When the Tap Breaks at the Bottom, the Problem May Have Started at the Drill
Tap failure often gets blamed on the tap because that's the tool left in the component.
But the cause can begin earlier.
Imagine a blind hole drilled only marginally deeper than the required full thread. The tap cuts downward, chips occupy space & the tool approaches the bottom before the required thread has been produced.
More torque isn't the solution.
The process ran out of room.
Thinking about drilled depth, usable thread depth, tap lead & chip space together can prevent a difficult extraction job later.
For a broader perspective on looking after cutting tools before problems become expensive, How To Clean Your Gear Without Ruining It covers practical workshop-care habits.
Expert Tips
Read the Hole Before Reading the Tap Catalogue
Through or blind?
Answer that first.
It immediately narrows the geometry worth considering.
Don't Assume a Spiral Tap & Spiral-Point Tap Move Chips the Same Way
Their names sound similar.
Their chip-control behaviour is not.
Spiral-point taps generally drive chips ahead in suitable through holes, while spiral-flute taps can pull chips back towards the entry in suitable blind holes.
Prove the Tapping Drill Before Sacrificing a Tap
When setting up an unfamiliar thread, verify the drilled diameter before tapping the first valuable component.
The few seconds spent measuring the preparation can save a damaged thread or broken tap.
Secure the Component Against Tapping Torque
A workpiece that moves while the tap is engaged can compromise alignment or damage the thread.
Clamps & Vises provides workholding options for applicable workshop threading setups.
Stop When the Cutting Feel Changes
A sudden increase in torque, poor chip behaviour or unusual resistance deserves investigation.
Forcing the tap because it is “nearly there” can turn a correctable setup problem into a broken tool inside the component.
Keep Threading Tools Identifiable
Similar-looking taps can have different pitches, geometries & intended applications.
Separate storage makes it easier to identify the right tool before it reaches the job. Tools Storage & Organization provides options for keeping workshop cutting tools organised between uses.
The Apprentice's First Tool Kit: What You Actually Need is also useful reading for tradespeople building the habit of choosing tools by operation rather than appearance.
