M35 Cobalt UNC & UNF Thread Forming Taps – TiN Coated
TiN-coated M35 cobalt HSS thread forming taps for UNC and UNF internal threads from #2-56 to 5/8-18. The chip-free forming process displaces ductile workpiece material instead of cutting it away, making this series suitable for both blind and through holes when the pre-hole diameter, lubrication and machine torque are correctly controlled.
Product Specifications
10 Pieces per Size
1–3 Days for In-Stock Sizes
Dimensions / Thread Tolerance / Coating / OEM
Consistent Quality
Consistent geometry across repeat orders.
Flexible Orders
Small batches and mixed sizes available.
OEM Support
Custom marking, labels and packaging.
Standard & Custom
Standard sizes and custom configurations.
M35 Cobalt UNC & UNF Thread Forming Taps – TiN Coated
These M35 cobalt HSS thread forming taps produce UNC and UNF internal threads by plastic deformation rather than conventional chip-cutting. The chip-free forming process is suitable for ductile workpiece materials and can be used in both blind and through holes when the material, pre-hole diameter, lubrication and machine torque are correctly matched. A TiN-coated forming surface provides added wear resistance, while the listed inch-thread range covers 42 specifications from #2-56 through 5/8-18 for CNC and production tapping applications.
Key Configuration
Forming lobes displace ductile workpiece material into the thread profile instead of cutting material away, eliminating conventional cutting chips.
M35 cobalt high-speed steel provides a wear-resistant tool substrate for repeat production and demanding thread-forming conditions.
The listed range includes Unified National Coarse and Unified National Fine thread specifications for small and fractional inch sizes.
Key Product Advantages
Key Product AdvantagesNo Cutting Chips
Plastic deformation forms the thread without generating conventional cutting chips, simplifying chip management in blind and through holes.
TiN-Coated Surface
TiN adds a hard wear-resistant surface to support repeated forming operations under suitable lubrication and machine conditions.
Broad Inch-Thread Range
The supplied chart lists 42 UNC and UNF specifications from #2-56 through 5/8-18.
Production Tapping
Suitable for controlled CNC and automated tapping when pre-hole diameter, torque, lubrication and synchronized feed are correctly set.
Thread Forming Applications
Thread forming is best suited to materials with sufficient ductility to flow under forming pressure. Because no cutting chips are produced, the same basic forming principle can be used in both blind and through holes. Machine torque, pre-hole diameter and lubrication are more critical than with many conventional cutting taps.
Thread forming requires a different pre-hole diameter from a conventional cutting tap. An undersized hole can sharply increase torque or cause tool failure, while an oversized hole can reduce thread formation. Confirm the forming-tap drill size for the material and required thread tolerance before production.
Workpiece Material Selection
| MATERIAL GROUP | TYPICAL MATERIALS | SELECTION NOTE |
|---|---|---|
| P Steel | Ductile carbon and alloy steels | Confirm grade, hardness & formability |
| M Stainless Steel | Selected ductile stainless steel grades | Application review recommended |
| N Non-Ferrous | Aluminum, copper, brass and other formable alloys | Good candidates when ductility is suitable |
Thread forming is intended for materials that can plastically deform without cracking. Brittle materials such as many cast irons are generally not appropriate for forming taps. Do not select the tool from material family alone; confirm the exact grade, hardness and ductility.
Thread Forming Details
Thread Forming DetailsThe product views below show the thread-forming configuration. Use the current UNC/UNF size chart for standard dimensional selection and confirm thread tolerance, pre-hole diameter and application requirements when ordering.
For additional threading configurations, browse our HSS Tap Range.
Thread Forming Tap Machining Video
Thread forming tap machining process demonstration.
UNC & UNF Size Chart & Specifications
The supplied chart lists 42 UNC and UNF thread forming tap specifications from #2-56 through 5/8-18. Tool diameters range from 2.184 to 15.875 mm, flute lengths from 9.5 to 32 mm, overall lengths from 44.5 to 102 mm, shank diameters from 2.8 to 12.5 mm and square-shank dimensions from 2.24 to 10 mm. Select the complete inch-thread size and pitch first, then confirm the pre-hole diameter, holder fit and required forming depth.
Dimensional Range
| Specification | Listed Range |
|---|---|
| Thread Sizes | #2-56 to 5/8-18 |
| Thread Forms | UNC / UNF |
| Tool Diameter | 2.184–15.875 mm |
| Flute Length | 9.5–32 mm |
| Overall Length | 44.5–102 mm |
| Shank Diameter | Ø2.8–Ø12.5 mm |
| Square Shank | 2.24–10 mm |
How to Select a UNC / UNF Forming Tap
Thread Forming Speed & Feed Setup
Final forming speed depends on the exact workpiece grade, hardness, thread size, pre-hole diameter, TiN coating condition, lubrication and available machine torque. Use tool-specific cutting data whenever available rather than applying a cutting-tap speed directly to a forming tap.
Setting Feed
Feed per revolution: For single-start UNC and UNF threads, feed per revolution must equal the thread pitch.
Inch-thread calculation: Pitch in inches = 1 ÷ TPI. Feed in inches per minute = RPM ÷ TPI.
Example: A 1/4-20 thread has a pitch of 0.050 in/rev. At 500 RPM, synchronized feed is 25 in/min. This illustrates feed calculation only and is not a material-specific speed recommendation.
HSS Tap Customization
For requirements beyond the standard range, send your tap drawing or application details. Custom HSS cutting and forming taps can be reviewed for the following specifications.
| PARAMETER | CUSTOMIZATION OPTIONS |
|---|---|
| Thread Specification | Metric, UNC/UNF and pipe threads; special diameters, pitches and left-hand threads. |
| Thread Accuracy | Tap limits and oversize allowances to suit the required internal-thread tolerance and gauging requirements. |
| Tap Geometry | Straight flute, spiral flute, spiral point or forming design; chamfer and working geometry matched to the application. |
| Length & Reach | Overall length, threaded-section length and neck clearance to suit thread depth and component access. |
| Shank & Drive Square | Shank diameter, square dimensions and holding length to match the tapping holder. |
| Material & Surface Finish | HSS or cobalt HSS grades; uncoated, TiN or TiCN options, depending on the tap design and workpiece material. |
Options depend on tap type and size. Final specifications, minimum order quantity and lead time are confirmed with the quotation. Explore Custom Tooling Services
OEM & Private Label
Customer branding and packaging can be specified for distributor and tooling-brand orders.
Laser marking: Logo, thread size, product code and batch identification, subject to available shank space. Labels & packaging: Protective tubes, product labels and branded packaging to the approved artwork.
For a quotation: Send a drawing or thread specification, required tolerance, workpiece material and hardness, blind or through-hole details, thread depth and quantity. Include machine, holder and lubrication details for application-specific requests.
HSS Tap Quality & Inspection
HSS cutting and forming taps are checked against the confirmed product specification or approved drawing. Material verification, in-process dimensional checks and final inspection focus on thread accuracy, tool geometry and consistent identification before packing.
Key Inspection Points
Inspection items and acceptance criteria depend on the tap type, size and agreed requirements.
| INSPECTION ITEM | CHECK POINTS |
|---|---|
| Material & Hardness | HSS or cobalt HSS grade and material records; hardness requirements and verification agreed for the selected grade. |
| Thread Form & Accuracy | Thread size, pitch, profile and specified tap limits against the confirmed specification or drawing. |
| Working Geometry | Flutes, spiral point and cutting edges for cutting taps; forming lobes and lubrication grooves, where present, for forming taps. Chamfer geometry checked for each design. |
| Tool Dimensions | Threaded-section length, overall length, shank diameter and drive-square dimensions. |
| Runout & Surface Condition | Specified runout, burrs, chipped edges and visible defects on cutting or forming surfaces. |
| Coating & Identification | Specified surface finish or coating, visible condition, tool marking and label accuracy. |
Inspection documentation: Specify any required material records, dimensional reports or sample-thread validation before ordering. Availability and inspection scope are confirmed with the quotation.
Packaging & Batch Identification
Individual protective packaging helps prevent damage to tap threads and working surfaces. Labels identify the tool specification and order or batch reference. Models, quantities and packing details are checked before dispatch.
Export Packing & Delivery
Outer cartons, cushioning and export packing are selected for the order quantity and shipping method. Dispatch dates, freight and payment terms are confirmed with the order.
FAQ & Technical Support
Selection, pre-hole preparation, lubrication and ordering guidance for M35 cobalt UNC & UNF TiN-coated thread forming taps.
Product & Application FAQs
Which UNC and UNF sizes are available?
The supplied size chart lists 42 specifications from #2-56 through 5/8-18, including coarse and fine Unified thread sizes such as 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 1/2-13 and 1/2-20. Use the complete diameter-and-TPI designation when ordering.
How does a thread forming tap differ from a cutting tap?
A thread forming tap creates the internal thread by plastically displacing workpiece material into the thread profile rather than cutting material away. This means conventional cutting chips are not produced. The process requires a formable workpiece material, a correctly controlled pre-hole diameter and sufficient machine torque.
Can these forming taps be used in both blind and through holes?
Yes. Because the forming process does not generate conventional cutting chips, thread forming taps can be used in both blind and through holes when the workpiece material is suitable. Hole depth, forming length, machine torque, lubrication and bottom clearance still need to be confirmed for each application.
Which materials are suitable for thread forming?
Thread forming requires materials with sufficient ductility to flow into the thread profile without cracking. Ductile steels, selected stainless steels, aluminum, copper, brass and other formable alloys may be suitable. Brittle materials such as many cast irons are generally poor candidates. Confirm the exact material grade, hardness and formability before production.
Why is the pre-hole diameter especially important for a forming tap?
The pre-hole supplies the material that is displaced into the thread profile. An undersized hole can produce excessive forming torque or tool failure, while an oversized hole can result in insufficient thread formation. Use a forming-tap-specific pre-hole recommendation rather than the drill size used for an equivalent cutting tap.
Do thread forming taps require lubrication if they do not produce chips?
Yes. Chip-free forming does not mean lubrication is unnecessary. Thread forming generates high contact pressure and friction while the material is displaced, so suitable high-lubricity tapping fluid or coolant is important for controlling torque, heat and tool wear.
What is the benefit of the TiN coating?
TiN provides a hard, wear-resistant surface on the M35 cobalt HSS tap. It can help reduce surface wear during repeated forming operations, but actual tool life still depends on material condition, pre-hole accuracy, lubrication, forming torque, machine alignment and tapping speed.
What machine setup is required for thread forming?
Use accurate tool alignment, a compatible tapping holder and synchronized feed. The machine must provide sufficient torque for the selected thread size and workpiece material. Feed per revolution must match the thread pitch, and the pre-hole diameter and lubrication should be verified before batch production.
Ordering & Customization FAQs
What information is needed for a quotation?
Provide the complete UNC or UNF size, quantity per size, workpiece material and hardness, blind- or through-hole application, required thread depth and finished-thread tolerance. Include pre-hole requirements, machine details, coating, marking and packaging requirements when applicable.
Can dimensions, thread tolerance or OEM branding be customized?
Custom dimensions, UNC or UNF thread specifications, tolerance requirements, coating options, laser marking and packaging can be reviewed according to the application and order quantity. Critical dimensions and inspection requirements should be confirmed before production.
Are sample orders and mixed sizes available?
Sample and mixed-size orders can be reviewed. MOQ, stock availability and dispatch timing depend on the selected UNC or UNF sizes, quantities and customization requirements. Send a size-and-quantity list for confirmation.
Selection Guides
Use the HSS guide for tool-material selection, compare tapping with thread milling where appropriate, and browse the HSS tap range for cutting and forming tap alternatives.
Catalog & Technical Downloads
HY Taps Catalog (PDF)General tap series reference. Use this product page’s Specifications & Sizes section for the current UNC and UNF thread forming tap dimensions; specifications in other tap series may differ.
HSS Cutting Tools Speeds & Feeds Guide (PDF)General HSS tapping reference. Thread forming requires application-specific verification of pre-hole diameter, lubrication and machine torque. Feed per revolution must match the selected UNC or UNF thread pitch.
Need Sizes, Pricing or Custom Options?
Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.
Drawings, size lists and reference photos are welcome.
