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Blind Hole Threading Made Easy: Spiral Point Taps for Smooth Starts

DISCOVER THE BAUCOR LEGACY:

GENERATIONS OF TAP INNOVATION AND A COMMITMENT TO EXCELLENCE

What is Spiral Point Tap? How does it work?

Spiral point tap, also commonly called "gun tap," is a type of tap specifically designed for creating threads in through-holes. They feature:

  • Straight Flutes: The primary flutes are straight, which allows for good coolant/lubricant flow to the cutting area.
  • Spiral Point (Gun Nose): The lead end of the tap has a forward angled gash or notch across the cutting chamfer. This point drives the chips forward as the threads are cut.
  • Shallow Flutes: The flutes tend to be shallower than other tap varieties, increasing the core strength and making the tap less prone to breakage.

How does it work?

The spiral point tap's design is intended to push chips forward and through the far end of the hole during the tapping process. This has several advantages, particularly for through-holes:

  • Minimized Clogging: Chips are less likely to become clogged in the tap's flutes, reducing the chance of breakage.
  • Smoother Threads: The forward ejection of chips helps create cleaner threads without interruptions from stuck debris.
  • Faster Tapping: Since chips are pushed forward, less time is spent reversing the tap to clear them, leading to faster overall tapping processes.
  • Good For Deeper Holes: The chip-clearing ability makes them suitable for slightly deeper through-holes.

Use Cases

Spiral point taps are ideal for:

  • Through-Hole Tapping: Their primary purpose.
  • Ductile Materials: Metals like aluminum, copper, and low-carbon steels, which tend to produce long and stringy chips.
  • Situations Requiring Speed: Production environments where faster tapping speeds are beneficial.

Considerations

  • Not Ideal for Blind Holes: Since chips are driven forward, spiral point taps aren't suitable for blind holes where chips would become trapped at the bottom.
  • Lubrication is Important: The forward chip flow benefits greatly from good lubrication to aid smooth chip ejection.

How are Spiral Point Taps manufactured?

The manufacturing process of spiral point taps is a multi-step operation requiring precision and specialized equipment.

1. Raw Material Selection and Preparation

  • Material: High-speed steel (HSS) or cobalt-based high-speed steel are standard choices for spiral point taps, offering toughness and heat resistance for demanding applications. Other possible materials are High-Speed Steel (HSS), Cobalt High-Speed Steel (HSS-Co), Powdered Metal (PM), High-Performance High-Speed Steel (HP-HSS), Carbide, Titanium Nitride (TiN), Titanium Carbonitride (TiCN), Titanium Aluminum Nitride (TiAlN), Diamond-like Carbon (DLC), Aluminum Titanium Nitride (AlTiN)
  • Stock Preparation: The HSS bars are cut to approximate length and heat-treated for increased hardness and wear resistance.

2. Blank Grinding

  • Forming the Basic Shape: The tap blank is rough ground to achieve the overall diameter and basic shank shape.
  • Flutes: Flutes are milled to an initial, shallower-than-final, depth into the blank. This is usually done on specialized flute milling machines.

3. Thread Grinding

  • Precision Threading: Thread grinding machines use high-speed, precision grinding wheels to cut the exact thread form into the tap, ensuring accuracy and meeting specifications (pitch, diameter, thread class, etc.).

4. Spiral Point Creation

  • Specialized Grinding: A separate machine and grinding wheel profile is used to form the spiral point. This creates the angled chamfer and chip-driving gash characteristic of these taps.

5. Surface Treatments and Finishing

  • Heat Treatment: Additional heat treatments (like nitriding or vapor deposition) may be applied to further increase surface hardness and wear resistance.
  • Surface Polishing: The tap is polished to improve chip flow and reduce friction.
  • Marking: Taps are marked with essential information like size, thread type, material, and manufacturer.

6. Quality Control

  • Dimensional Checks: Threads, diameters, and flute depths are meticulously checked against standards using gauges and measuring instruments.
  • Hardness Testing: Hardness tests ensure that the heat treatments achieved the desired results.
  • Visual Inspection: Taps are inspected for surface defects or any imperfections.

Additional Notes

  • CNC (Computer Numerical Control) machines are used throughout the process for precision and repeatability.
  • Specific grinding wheel materials and profiles are critical for each stage and the type of tap material used.
  • Lubricant and cooling systems are integral to grinding processes, especially for working with hard materials like HSS.

GET A QUOTE

What sizes does Baucor manufacture Spiral Point Taps?

When it comes to efficient through-hole threading and tackling challenging materials, Baucor delivers exceptional spiral point taps. Here's what you can expect:

Performance-Driven Design

  • High-Quality Materials: Baucor spiral point taps are likely crafted from premium High-Speed Steel (HSS) for general use or Cobalt High-Speed Steel (HSS-E) for tougher materials, ensuring long tool life. Other possible materials are High-Speed Steel (HSS), Cobalt High-Speed Steel (HSS-Co), Powdered Metal (PM), High-Performance High-Speed Steel (HP-HSS), Carbide, Titanium Nitride (TiN), Titanium Carbonitride (TiCN), Titanium Aluminum Nitride (TiAlN), Diamond-like Carbon (DLC), Aluminum Titanium Nitride (AlTiN)
  • Advanced Geometry: Expect precise spiral point design for effective chip evacuation and reduced tool breakage even in deeper holes.
  • Performance Coatings (Potential): Baucor might offer coatings like Titanium Nitride (TiN) or others for further enhancement based on your application needs.

Common Size Ranges You Might Find

  • Metric Coarse (M): Popular sizes include M3, M4, M5, M6, M8, M10, M12, and larger.
  • Metric Fine (M): Look for sizes like M8 x 1, M10 x 1.25, M12 x 1.5 for applications needing finer thread pitches.
  • Unified National Coarse (UNC): Expect to find 1/4-20, 5/16-18, 3/8-16, 1/2-13, and larger sizes.
  • Unified National Fine (UNF): Commonly available sizes include 1/4-28, 5/16-24, 3/8-24, 1/2-20, and larger.

Baucor can manufacture taps for you ranging from very small sizes like M0.5 to large sizes up to M68, accommodating a wide spectrum of threading requirements.

Please contact us for the appropriate dimensions. Baucor can produce taps in the most specialized sizes tailored to your needs.

What materials are used to make Spiral point Taps?

Spiral point taps are built to handle tough materials and demanding applications. With Baucor's likely focus on quality, here's a breakdown of the materials you can expect in their taps:

Common Materials

  • High-Speed Steel (HSS): The versatile foundation of many taps, HSS offers solid performance in a range of materials:
  • Hardness: Important for effective thread cutting in various workpiece materials.
  • Toughness: Reduces the risk of breakage during tapping, even in less optimal conditions.
  • Affordability: Cost-effective for general-purpose tapping applications.
  • Cobalt High-Speed Steel (HSS-E): The enhanced version of HSS! Perfect for challenging scenarios:
  • Heat Resistance: Crucial for tapping tougher materials, high-volume production, or situations with limited lubrication.
  • Wear Resistance: Prolongs tap life and reduces the need for frequent tool changes.

Less Common (But Viable) Materials

  • Powdered Metal High-Speed Steel (PM HSS): The king of wear resistance! PM HSS outperforms standard HSS grades in demanding applications:
  • Tough Workpiece Materials: Ideal for tapping hardened, highly abrasive, or stainless steels.
  • High-Volume Production: Justifies the higher cost through exceptional tool longevity, especially in blind hole situations where chip buildup is a concern.
  • Carbide: In specialized applications, primarily high-volume production scenarios, solid carbide spiral point taps might be used:
  • Maximum Wear Resistance: Outperforms even PM HSS when tapping the most challenging materials.
  • Precision and Rigidity: Maintains tight tolerances and produces high-quality threads.

Choosing the Right Material with Baucor:

  • Match the Tap to Your Workpiece: The hardness and toughness of the material you're tapping are crucial factors in choosing the right tap material. Contact Baucor for specific recommendations based on your applications.
  • Performance vs. Cost: Consider the demands of your project. Sometimes, investing in a tap with a more robust material upfront can save you money long-term due to extended tool life and reduced breakage.

What coatings improve Spiral point Taps?

Choosing the right coating can have a major impact on spiral point tap performance and longevity. Baucor likely understands this, potentially offering these coatings to enhance their taps:

Common Coatings

Titanium Nitride (TiN): The classic gold-colored coating offering a good all-around improvement:

  • Wear Resistance: Extends tool life, especially when tapping abrasive materials, allowing the tap to maintain its chip-forming capabilities longer.
  • Reduced Friction: Less friction means smoother tapping, less heat generation, and potentially better thread quality. This is especially important for spiral point taps as smooth operation can help with chip flow in blind holes.

Titanium Aluminum Nitride (TiAlN): Steps up the game for high-heat applications:

Heat Resistance: Maintains its properties even at elevated temperatures typical in tapping tougher materials, high production speeds, or when tapping deeper blind holes.

Lubricity: Low friction aids chip evacuation and minimizes force requirements.

  • Titanium Carbonitride (TiCN): Excels at reducing friction:
  • Galling Resistance: Reduces material sticking to the tap, particularly helpful in softer materials like aluminum.
  • Chip Flow: Smoother surfaces aid in chip evacuation within blind holes.

Specialized & Alternative Coatings

  • Chromium Nitride (CrN): Offers value in specific scenarios:
  • Corrosion Resistance: Important for environments with water-based coolants or when tapping materials prone to causing corrosion.
  • Moderate Improvements: Offers some gains in wear resistance and friction reduction.

Diamond-Like Carbon (DLC): The extreme performance option:

  • Unmatched Hardness: Exceptional wear resistance for tackling the most demanding workpiece materials.
  • Super Low Friction: Optimizes chip evacuation, crucial in the confined space of blind holes, and minimizes galling risks.

Multi-Layer Coatings: Cutting-edge coatings combining multiple materials in strategic layers:

Customized Performance: Tailored to overcome specific challenges like heat, galling, and extreme wear, making them suitable for demanding blind hole applications.

  • Proprietary Coatings: Some manufacturers might offer unique coatings specialized for particular materials or optimized for blind hole tapping.

The Baucor Advantage: Tap Performance Optimization

Baucor understands the impact coatings have on tap functionality. Contact us to discuss:

  • Your Workpiece Material: Get recommendations for the best coating based on the material you're tapping.
  • Project Requirements: Discuss factors like desired tool life and expected production volume to determine if advanced coatings provide a cost-effective solution.

GET A QUOTE

Where are Spiral Point Taps used?

Spiral point taps, known for their superior chip evacuation in through-holes, have a wide range of applications across industries. Baucor's quality spiral point taps likely cater to the following sectors:

Key Industries Relying on Spiral Point Taps

  • General Manufacturing: From creating threaded connections in small components to large assemblies and finished products, spiral point taps are essential across the manufacturing world.
  • Automotive and Transportation: Tapping fluid lines, brake system components, engine parts, and various fasteners is commonplace in automotive manufacturing and repair.
  • Aerospace: Precision and reliability are non-negotiable. Spiral point taps help create clean, accurate threads in structural components, engine parts, and complex systems where clogging could be disastrous.
  • Heavy Equipment: The rugged world of construction, agriculture, and mining machinery relies on secure threaded connections. Spiral point taps help create these connections for hydraulic assemblies, structural components, and more.
  • Plumbing (Commercial): Large-scale plumbing systems in buildings and facilities often necessitate spiral point taps for reliable threading in pipes, valves, manifolds, and other crucial components.
  • Maintenance and Repair (MRO): From small workshops to vast industrial facilities, spiral point taps are vital for restoring damaged threads across diverse industries, extending the lifespan of valuable parts and equipment.

Why Spiral Point Taps?

  • Chip Control: The signature forward-ejecting design prevents clogging, reducing breakage risks and ensuring clean threads.
  • Through-Hole Efficiency: Ideal for through-hole applications, especially deeper holes, where chip evacuation is crucial.
  • Speed and Accuracy: The smooth tapping process enabled by chip control translates to faster cycle times and improved thread quality.

The Potential of Baucor

Baucor's commitment to quality means their spiral point taps are designed to meet the demanding needs of these various sectors. Contact us to find the perfect taps, matched to your workpiece materials and specific threading applications.

Which industries use Spiral Point Taps?

Known for their efficient chip removal in through-holes, spiral point taps find extensive use throughout various industries. This likely includes companies like Baucor, offering quality taps for diverse needs.

  • Manufacturing (General): A mainstay for creating threaded connections across a broad range of components, sub-assemblies, and final products.
  • Automotive: Used for tapping fluid lines, engine components, fasteners, and various structural elements.
  • Aerospace: Employed where precision and clean threads are paramount in critical components, engines, and systems.
  • Plumbing (Commercial/Industrial): Essential for forming secure connections in pipes, valves, and other large-scale plumbing systems.
  • Heavy Equipment: Taps threaded connections in structural parts, hydraulic systems, and various components for construction, mining, and agricultural machinery.
  • Maintenance and Repair (MRO): Crucial for restoring damaged threads across numerous industries, prolonging the lifespan of equipment.

Why Choose Spiral Point Taps?

  • Superior Chip Evacuation: Minimizes clogging and breakage, especially in deeper through-holes.
  • Faster Tapping Cycles: Smooth operation speeds up production.
  • Thread Quality: Reduced chip interference leads to cleaner, more precise threads.

What machines use Spiral Point Taps?

Spiral point taps, designed for efficient through-hole threading and chip evacuation, are compatible with various machines, from manual setups to advanced automation. Here's where you might see them in action:

Manual and Semi-Automated:

  • Drill Presses: Many drill presses have tapping functions, making them suitable for basic tapping operations with spiral point taps.
  • Milling Machines (with Rigid Tapping): These machines offer increased control and precision compared to drill presses for tapping tasks.

CNC Machines:

  • CNC Milling Machines (VMCs): Offer the versatility of tapping alongside other machining operations, streamlining part production processes.
  • CNC Lathes (with Live Tooling): These machines can create threaded connections perpendicular to a part's centerline, such as on the side of a pipe or fitting.
  • Dedicated Tapping Machines: Specialized for high-volume thread production with fast cycle times and automated tool changes.

Additional Considerations:

  • Tap Holders: The choice of tap holder (e.g., ER collet chuck, quick-change tapping chuck) affects tap rigidity and may offer compensation for minor misalignments.
  • Machine Capabilities: Ensure the machine's spindle speed and feed rate capabilities are suitable for the size of tap and workpiece material.
  • Lubricant/Coolant: Proper lubrication is crucial for smooth tapping, chip evacuation, and extended tap life.

What design and engineering support does Baucor provide for Spiral Point Taps?

Choosing the right spiral point tap is crucial for successful threading operations. Baucor, as a potential provider of high-quality taps, might offer several resources and expertise to guide you:

Key Support Areas

  • Technical Datasheets: Your Go-To Resource: Start by searching Baucor's website for downloadable datasheets specific to their spiral point taps. These datasheets are a goldmine of information, including:
  • Detailed Specifications: Thread standards, tap dimensions, material composition, and shank details.
  • Recommended Applications: Discover the ideal workpiece materials and hole sizes for each tap.
  • Lubrication Guidance: Learn the best lubricants for your specific tapping operations.
  • Material Selection Assistance: Baucor's team or their distributors may assist in selecting the optimal tap material (HSS, cobalt HSS, PM HSS, etc.). Get advice based on your specific workpiece properties (hardness, toughness) and application requirements to maximize tap performance.
  • Thread Standard Guidance: Ensure you're creating the correct thread type and pitch (UNC, Metric, etc.) by seeking support from Baucor. This is particularly helpful when dealing with less common or specialized thread profiles.
  • Application-Specific Optimization: For complex threading tasks or challenging materials, Baucor might offer in-depth consultations. Get expert recommendations on coatings, tapping speeds, feed rates, and the ideal lubrication strategies for the best results.
  • Custom Tap Design: Solutions for Unique Needs: Does your project require a highly specialized tap? Baucor might have the capabilities to design and manufacture custom spiral point taps that perfectly match your unique thread requirements or work with particularly difficult materials.

UNMATCHED ENGINEERING SUPPORT

Your Solution, Your Scale

Whether you need a single prototype or full-scale production, BAUCOR''s engineers are ready to collaborate with you. Contact us to discuss how we can bring your concept to life.

Tailored Solutions for BAUCOR Customers

BAUCOR specializes in providing unique manufacturing and engineering solutions designed to meet the specific needs of each client. Our expertise covers a wide range of industries and applications.

What are the design guides for Spiral Point Taps?

While there's no single design blueprint for all spiral point taps, they follow a combination of industry standards and manufacturer-specific choices. Let's delve deeper into the crucial design considerations:

Key Design Aspects

Standards and Specifications

  • Thread Standards (ISO, ANSI): These are the bedrock of tap design. Spiral point taps meticulously adhere to standards like ISO Metric Coarse or ANSI Unified National Fine, ensuring your threads are accurate and interchangeable with matching components.
  • Manufacturer Specifications: Each manufacturer has its own quality control standards, tolerances, and design nuances. These details can significantly impact tap performance and will be found in the technical datasheets.

Flutes

  • Spiral Angle: This angle is crucial. A steeper angle means more aggressive cutting and faster chip evacuation, ideal for tougher materials. A shallower angle provides a smoother cut, well-suited to softer materials.
  • Number of Flutes: This impacts chip formation, the space available for them to travel, and the overall strength of the tap. Most spiral point taps have a limited number of flutes to prioritize chip evacuation.

Thread Form

  • Profile: The thread's shape (sharp V, rounded, etc.) is defined by the standard being followed. It must perfectly match the intended internal thread for a secure connection.
  • Dimensions: Thread elements like major/minor diameters, pitch, and tolerances are meticulously controlled. Adherence to standards ensures perfect fit and interchangeability.

Point Geometry:

  • Spiral Point: The defining feature of this tap! The point's precise design dictates how chips are formed and ejected forward. Subtle variations can influence chip flow, breakage risks, and overall performance.

Material

High-Speed Steel (HSS): The workhorse of tap materials, offering a great balance of toughness, hardness, and affordability.

Cobalt High-Speed Steel (HSS-E): When toughness needs a boost, HSS-E steps in. Ideal for stainless steels and other challenging materials due to its enhanced heat and wear resistance.

Powdered Metal High-Speed Steel (PM HSS): The champion of tough jobs! PM HSS offers unparalleled wear resistance and toughness due to its uniform microstructure.

  • Chamfer: The tap's leading edge. Chamfer types (plug, bottoming, etc.) exist, each suited to a different initial cutting action.
  • Shank: Standardized to fit common tool holders (e.g., collets on machines or tap wrenches).
  • Surface Treatments (Optional)
  • Titanium Nitride (TiN): The classic gold-colored coating that boosts wear resistance and reduces friction.

Other Coatings: TiAlN (for high-heat scenarios), CrN (for corrosion concerns), or multi-layer coatings for specialized performance needs.