Blind Hole

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Blind Hole
GSR Gustav Stursberg GmbH | Schmiedestraße 4 | 42899 Remscheid | Germany
What exactly is a through hole? What is a blind hole? What is the difference between a through hole and a blind hole? What do I have to pay attention to when cutting a blind hole? We provide you with answers and an overview.
When cutting an internal thread, a core hole must first be pre-drilled with a twist drill ( More information about the core hole here! ). When drilling a core hole, we distinguish between a through hole and a blind hole.
A through hole is a hole that goes through the entire workpiece. In contrast to the blind hole, a hole does not pass through the entire workpiece. The blind hole always has only a certain depth. The picture below shows a cross section of both a through hole and a blind hole:
Depending on which core hole you choose, you will need different taps. Since the chip removal must be either above or below the hole to be able to cut the thread cleanly.
The left-hand machine tap has a straight flute and has a peel point ( More about the flute shape of taps ). This machine tap is only suitable for through holes, as the chips are ejected below the hole. Logically, such a tap cannot be used for blind holes. The chips would clog the blind hole and make clean cutting impossible. In the worst case, the thread could be severely damaged and the tap could break off.
Therefore, when drilling blind holes, it is recommended to use a machine tap that has a right-hand spiral flute and where the chips are therefore removed above the hole. In addition, the core hole in blind holes should be pre-drilled deeper than the desired thread by the length of the chamfer.
core holes in cross section: bore of a through hole with a straight fluted machine tap and peel cut
Core holes in cross-section: Bore of a blind hole (SaLo) with a right-hand twisted spiral tap
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On threadingtoolsguide.com we write about interesting facts about threading tools. Learn the correct handling of thread cutters, dies, twist drills, countersinks etc. In addition, we will inform you about trends and news in the world of threading tools!
Everything you need to know about threading tools! ✅
Do you have questions, suggestions or criticism? Please contact us! ✅
Threading tools guide – a blog of GSR Gustav Stursberg GmbH © 2022 Copyright
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Rotational Molding and Plastic Thermoforming
Learn about blind holes, through holes, and undercut holes for rotational molding design.
Rotational molding produces strong, hollow plastic parts. Sometimes, holes or vents are required to equalize the pressure on the part’s inner and outer walls during the heating and cooling of the mold. Spherical or ball-shaped parts can be produced without vents since the shape of the part resists contraction caused by cooling. Parts with large, flat, unsupported surfaces require proper venting to minimize warpage.
According to the Introductory Guide to Designing Rotationally Molded Plastic Parts , a publication from the Association of Rotational Molders (ARM) that features numerous images of rotomolded parts from Gregstrom Corporation, there are some best practices to consider when designing vent holes. Part designers should also consider the differences between blind holes, through holes, and undercut holes. The following sections explain.
Rotational molding supports blind holes that project into the plastic part. Outwardly-projecting blind holes are not recommended because the plastic will not flow down into the restricted walls around the core pin that forms the blind hole. With inwardly-projecting blind holes, keep the hole-depth as small as possible for best results. This will minimize problems associated with inadequate heating at the tip of the core pin.
Rotational molding also supports through holes or bosses that are outwardly-projecting. These holes can be produced by over-designing the projection and cutting-off the tip after molding. As a rule, the outside diameter of an outwardly-projecting through hole must be a minimum of six times the nominal wall thickness. The inside diameters of these holes are more difficult to control since they are free-formed instead of molded over the core pin.
Unlike blind holes and through holes, undercut holes are not perpendicular to the parting line of the mold. Rather, undercut holes have an axis that’s parallel to the mold’s parting line. To produce undercut holes, side-acting molds or removable inserts can be used. Another way to produce large openings in rotomolded parts is to mold two parts as one piece and then cut them apart after molding.
Do you have questions about blind holes, through holes, undercut holes or other aspects of rotational molding design? Would you like to learn more about rotational molding’s advantages over injection molding and other manufacturing processes for plastic parts? Maybe you’re interested in rotational molding materials or the different types of molds instead. For more information, contact Gregstrom .

Rotomolded plastic parts are replacing cast or machined metal components in an increasing number of industrial…

A draft angle is a taper that’s applied to a rotomolded part’s vertical walls so that…

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Customer Service Email: sales@mcmaster.com
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Chip-Clearing Taps for Closed-End Holes
Hex Shank Taps for Drills and Screwdrivers
Taps for Aluminum, Brass, and Plastic
Long-Reach Pipe and Conduit Thread Taps
Left-Hand Pipe and Conduit Thread Taps
Economy Carbon Steel Pipe and Conduit Thread Taps
Pipe and Conduit Thread Taps for Shallow Holes
Pipe and Conduit Thread Taps with Two Threading Ends
Chip-Clearing Pipe and Conduit Thread Taps
Pipe and Conduit Thread Taps for Stainless Steel and Plastic
Pipe and Conduit Thread Taps for Aluminum, Copper, and Brass
Pipe and Conduit Thread Taps for Steel
Hex-Shank Tap Sets for Drills and Screwdrivers
Hex-Shank Tap and Drill Bit Sets for Drills and Screwdrivers
By using this website, you agree to our Terms and Conditions and Privacy Policy
The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)
We will reply to your message within two hours.
We will reply to your message within two hours.
Cut threads into most metal and plastic.
Use the extra-long shank to thread deep and hard-to-reach holes.
Tap threads for left-hand threaded fasteners.
Sized to cut oversized threads, these tools are often used to tap holes where the threads will shrink due to heat treatment or plating.
Often used for thread repair and occasional hand tapping, these carbon steel taps can thread holes in most metal and plastic, but they have a shorter tool life than standard taps.
Use these taps on hard and abrasive material, such as heat-treated metal, nickel, and fiberglass.
The spiral flute design pulls chips back toward the tap, so chips won't accumulate in closed-end holes.
Also known as cold-forming and fluteless taps, these press threads into material without cutting it, so no chips are created.
With a taper chamfer and bottoming chamfer at opposite ends, these taps start threads easily and are good for threading close to the bottom of closed-end holes.
Insert these taps directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank.
Coated with chromium carbide or titanium carbonitride (TiCN), these cobalt steel taps cut smoothly through soft material to produce accurate threads.
These taps are made of cobalt steel for higher strength and wear resistance than standard taps. Their flutes are designed to keep chips clear, so they don't need to be reversed to prevent buildup.
Tap threads into hardened steel and iron. These cobalt steel taps have straight flutes for high durability.
A high helix angle provides the cutting strength needed to tap threads in titanium. These cobalt steel taps have an open flute design that keeps chips clear, so they don't need to be reversed to prevent buildup.
To tap nickel and other hard material, these cobalt steel taps have high cutting strength. Their flutes are designed to keep chips clear, so they don't need to be reversed to prevent buildup.
Create threads sized for pipe and conduit.
With an extra-long shank, these taps have extended reach for tapping deep and hard-to-reach areas in pipe and conduit.
Tap left -hand threads for pipe and conduit.
Use these carbon steel taps for thread repair and occasional tapping of pipe and conduit. They can tap threads into most metal and plastic, but they have a shorter tool life than standard taps.
Also known as short-projection taps, these have fewer tapered threads at the tip than standard pipe taps, so you don't have to drive them as deep to produce full threads.
With a taper chamfer on one threading end and a bottoming chamfer on the other, these pipe and conduit taps can start threads easily, and they are able to thread close to the bottom of closed-end holes.
Also known as interrupted-thread taps, these have extra space between the cutting threads, so large chips fall without packing and high amounts of lubricant can flow between the tap and the workpiece.
The spiral flutes on these pipe and conduit taps keep chips clear by drawing them back out of the hole, so there's no need to reverse the tap while cutting threads.
The cutting teeth are shaped to cut smooth threads in soft pipe and conduit material.
Made of cobalt steel, these taps are for use on steel pipe and conduit.
Cut threads in PG thread sizes commonly used for European conduit.
Cut a range of thread sizes with a single tool. These thread mills can also produce both right-hand and left-hand threads.
Produce metric threads that meet Japanese Industrial Standards.
The coil -style threads produced by these taps are shallower and more widely spaced than standard thread sizes. Use them for quick threading action with compatible fasteners.
Tap the unique size needed for garden hose thread (GHT) connections.
Add threads to holes in preparation for installing helical inserts.
Use these high-speed steel taps to cut and repair threads in the sizes needed to accept spark plugs.
Also known as National Gas Outlet (NGO) taps, these tap threads in sizes used for compressed gas cylinders and valves.
Attach these tools to a socket wrench to restore rusted and damaged spark plug threads in two common sizes.
These taps are for use on most metal and plastic.
For start -to-finish tapping of left-hand threads, these sets include one taper -, one plug -, and one bottoming-chamfer tap.
Multiple tap sizes allow tapping a range of hole diameters. Connect these taps directly to drills, power screwdrivers, and other tools that accept a 1/4" hex shank.
Create pipe and conduit threads in a range of hole diameters.
Drill and tap a variety of hole sizes. These taps and drill bits are for use on metal and plastic.
All taps and drill bits have a hex shank for direct connection to tools such as drills and power screwdrivers.

Customer Service Email: sales@mcmaster.com
DFARS (Defense Acquisition Regulations Supplement)
RoHS (Restriction of Hazardous Substances)
REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)
Enter e-mail addresses in the fields below
E-mail address (if you would like a response)
Chip-Clearing Taps for Closed-End Holes
Hex Shank Taps for Drills and Screwdrivers
Taps for Aluminum, Brass, and Plastic
Long-Reach Pipe and Conduit Thread Taps
Left-Hand Pipe and Conduit Thread Taps
Economy Carbon Steel Pipe and Conduit Thread Taps
Pipe and Conduit Thread Taps for Shallow Holes
Pipe and Conduit Thread Taps with Two Threading Ends
Chip-Clearing Pipe and Conduit Thread Taps
Pipe and Conduit Thread Taps for Stainless Steel and Plastic
Pipe and Conduit Thread Taps for Aluminum, Copper, and Brass
Pipe and Conduit Thread Taps for Steel
Hex-Shank Tap Sets for Drills and Screwdrivers
Hex-Shank Tap and Drill Bit Sets for Drills and Screwdrivers
By using this website, you agree to our Terms and Conditions and Privacy Policy
The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)
We will reply to your message within two hours.
We will reply to your message within two hours.
Cut threads into most metal and plastic.
Use the extra-long shank to thread deep and hard-to-reach holes.
Tap threads for left-hand threaded fasteners.
Sized to cut oversized threads, these tools are often used to tap holes where the threads will shrink due to heat treatment or plating.
Often used for thread repair and occasional hand tapping, these carbon steel taps can thread holes in most metal and plastic, but they have a shorter tool life than standard taps.
Use these taps on hard and abrasive material, such as heat-treated metal, nickel, and fiberglass.
The spiral flute design pulls chips back toward the tap, so chips won't accumulate in closed-end holes.
Also known as cold-forming and fluteless taps, these press threads into material without cutting it, so no chips are created.
With a taper chamfer and bottoming chamfer at opposite ends, these taps start threads easily and are good for threading close to the bottom of closed-end holes.
Insert these taps directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank.
Coated with chromium carbide or titanium carbonitride (TiCN), these cobalt steel taps cut smoothly through soft material to produce accurate threads.
These taps are made of cobalt steel for higher strength and wear resistance than standard taps. Their flutes are designed to keep chips clear, so they don't need to be reversed to prevent buildup.
Tap threads into hardened steel and iron. These cobalt steel taps have straight flutes for high durability.
A high helix angle provides the cutting strength needed to tap threads in titanium. These cobalt steel taps have an open flute design that keeps chips clear, so they don't need to be reversed to prevent buildup.
To tap nickel and other hard material, these cobalt steel taps have high cutting strength. Their flutes are designed to keep chips clear, so they don't need to be reversed to prevent buildup.
Create threads sized for pipe and conduit.
With an extra-long shank, these taps have extended reach for tapping deep and hard-to-reach areas in pipe and conduit.
Tap left -hand threads for pipe and conduit.
Use these carbon steel taps for thread repair and occasional tapping of pipe and conduit. They can tap threads into most metal and plastic, but they have a shorter tool life than standard taps.
Also known as short-projection taps, these have fewer tapered threads at the tip than standard pipe taps, so you don't have to drive them as deep to produce full threads.
With a taper chamfer on one threading end and a bottoming chamfer on the other, these pipe and conduit taps can start threads easily, and they are able to thread close to the bottom of closed-end holes.
Also known as interrupted-thread taps, these have extra space between the cutting threads, so large chips fall without packing and high amounts of lubricant can flow between the tap and the workpiece.
The spiral flutes on these pipe and conduit taps keep chips clear by drawing them back out of the hole, so there's no need to reverse the tap while cutting threads.
The cutting teeth are shaped to cut smooth threads in soft pipe and conduit material.
Made of cobalt steel, these taps are for use on steel pipe and conduit.
Cut threads in PG thread sizes commonly used for European conduit.
Cut a range of thread sizes with a single tool. These thread mills can also produce both right-hand and left-hand threads.
Produce metric threads that meet Japanese Industrial Standards.
The coil -style threads produced by these taps are shallower and more widely spaced than standard thread sizes. Use them for quick threading action with compatible fasteners.
Tap the unique size needed for garden hose thread (GHT) connections.
Add threads to holes in preparation for installing helical inserts.
Use these high-speed steel taps to cut and repair threads in the sizes needed to accept spark plugs.
Also known as National Gas Outlet (NGO) taps, these tap threads in sizes used for compressed gas cylinders and valves.
Attach these tools to a socket wrench to restore rusted and damaged spark plug threads in two common sizes.
These taps are for use on most metal and plastic.
For start -to-finish tapping of left-hand threads, these sets include one taper -, one plug -, and one bottoming-chamfer tap.
Multiple tap sizes allow tapping a range of hole diameters. Connect these taps directly to drills, power screwdrivers, and other tools that accept a 1/4" hex shank.
Create pipe and conduit threads in a range of hole diameters.
Drill and tap a variety of hole sizes. These taps and drill bits are for use on metal and plastic.
All taps and drill bits have a hex shank for direct connection to tools such as drills and power screwdrivers.

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