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+技術資源 > Thread Technology
UGMIC Thread Tool Technology
A. Explanation of Thread Product Function Names
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Name Group |
Suggested Name |
Technical Explanation
Direction
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Limitations and Verification That Must Be Displayed Simultaneously |
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Flute type |
Straight flutes |
Use basic cutting, cutting edge strength, short chips, and partial through holes as the assessment entry points. |
Not directly equivalent to all short-chip materials; check hole type, depth, chip exit, and torque. |
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|
Flute type |
Spiral flutes |
Use chip movement from
inside the hole toward the
hole opening, long chips,
blind holes, and deep
threads as the assessment
entry points.
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Spiral angle, hole depth, pilot hole, chip type, cooling, and synchronization must be verified together. |
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Flute type |
Pointed flutes |
Use forward chip pushing in through holes and exit quality as the assessment entry points. |
Exit burrs, thread form, chip length, and workpiece support must be confirmed. |
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Forming |
Roll Form |
Use material plastic deformation and low-chip / near chipless forming as the assessment entry points. |
Material ductility, pilot hole size, forming torque, lubrication, and springback are threshold conditions. |
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Material |
Solid carbide |
Explain from the perspectives of overall rigidity, hardness, wear resistance, and high-temperature retention. |
Larger sizes usually require higher investment in material, grinding, and inspection; this cannot compensate for runout/misalignment or incorrect parameters. |
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|
Material |
Welded carbide |
Explain through the division of function between the carbide cutting portion and the tool-steel body, as well as cost balance. |
For small sizes, long overhang, high torque, or high precision, body support and welded-zone load must be confirmed. |
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|
Material |
HSS / HSS-Co |
Explain from the perspectives of toughness, impact resistance, and material matching, and confirm material marking according to the official catalog. |
Do not conclude “softer” or “definitely will not break”; verification must be based on hardness, chips, and equipment. |
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Geometry |
Dedicated cutting edge clearance |
Link material, effective cutting, friction, built-up chips, and cutting edge strength. |
Clearance cannot be judged independently from thread form, cutting edge strength, material, and machining parameters. |
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Geometry |
Dedicated thread clearance / thread back-relief |
Link contact with the machined thread surface, friction, dimensional drift, and springback. |
Thread surface, pitch diameter, torque, wear, and go/no-go gauge results must be observed. |
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|
Chip evacuation / Cooling |
Interrupted thread structure #X |
Use reduction of continuous contact, increased chip evacuation space, and reduction of secondary friction as the assessment direction. |
Do not fill in a fixed improvement percentage; verify through chips, torque, temperature rise, thread form, and wear. |
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Chip evacuation / Cooling |
Internal cooling (H) |
Use center internal cooling, cooling, lubrication, and forced chip evacuation as the assessment direction. |
Machine pressure / flow rate, toolholder channels, coolant, and hole depth must be confirmed. |
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Surface |
Ti/TiCN |
Assess from friction, wear resistance, and temperature conditions. |
Coating cannot replace correct tool geometry, pilot hole, cooling, and feed synchronization. |
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External thread |
Adjustable |
Use fine adjustment, dimensional reset, go/no-go gauges, and post-process requirements as the assessment direction. |
Adjustment amount, adjustment time, tool concentricity, and results after reset must be recorded. |
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Shank |
Use positioning, toolholder interface, center position, and rigidity as the assessment direction. |
Overhang, runout, clamping, vibration, and equipment compatibility must be confirmed. |
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Milling |
Full-tooth / |
Respectively explain the full-tooth efficiency direction and the three-tooth path / flexibility direction. |
Must be linked to CNC toolpaths, tool compensation, specifications, unit cycle time, and tool wear. |
B. Explanation of Thread Standard Symbols
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Standard / Symbol Group |
Key Points for Page
Interpretation
|
Main Product Links |
Quality and Functional Verification |
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M／Metric |
Nominal diameter, pitch, tolerance, internal/external threads, and assembly. |
13 products allocated according to actual specifications. |
Thread gauge, pitch diameter, thread form, assembly torque. |
|
W／Whitworth |
Thread form and application cannot be directly mapped to metric dimensions. |
Straight flutes, spiral flutes, roll form, thread dies, and milling products according to catalog. |
Thread form, pitch / threads per inch, fit, and function. |
|
UN／UNC／UNF／UNEF／UNS |
Diameter, threads per inch, tolerance, and application of the Unified Thread Series. |
HSS-Co / carbide thread taps, thread mills, thread milling wheels. |
2B / external thread correspondence, tolerance, go/no-go gauge, assembly. |
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G／PF／BSP／Rp／PS |
Symbols, threads per inch, sealing method, and fit for parallel pipe threads. |
Thread taps, thread dies, thread milling wheels. |
Gauge length, thread form, go/no-go gauge, sealing / pressure. |
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R／Rc／PT／BSPT |
Taper, interference, cutting cross-section, and sealing for tapered pipe threads. |
Pointed / spiral / roll form and external-thread tools assessed according to operating conditions. |
Taper, gauge length, torque, sealing / pressure. |
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NPT／NPTF |
Differences between North American tapered pipe threads and dry-seal requirements. |
Thread taps, thread dies, thread mills, thread milling wheels according to catalog. |
Thread form, gauge position, go/no-go gauge, sealing function. |
|
ACME／TW-ACME-STUB |
Trapezoidal thread form, flank load bearing, lead, and transmission. |
Thread mills, roll form thread taps, or dedicated tools. |
Flank contact, lead, pitch diameter, load / transmission. |
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Tr |
Metric trapezoidal threads, lead, and fit accuracy. |
Thread mills, roll form or dedicated thread taps. |
Thread form projection, pitch diameter, lead, assembly and load. |
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BUTT／Special threads |
Asymmetric load bearing, dedicated flank, and directional functions. |
Dedicated thread mills or custom tools. |
Load-side thread form, contact surface, directional load. |
C. Thread Tool Requirement Confirmation Form for Ordering
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Form Section |
Required Information |
Optional / Attachment Information |
Corresponding Assessment |
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Thread specification |
Standard symbol, size, pitch / threads per inch, lead, internal / external thread, tolerance. |
Drawings, 3D, thread-form cross-section. |
Confirm thread form, product series, and inspection gauges. |
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Workpiece and material |
Material grade, hardness, heat treatment, ductility / toughness / work-hardening condition. |
Material certificate, batch differences. |
Determine HSS-Co, welded carbide, solid carbide, or forming path. |
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Hole type / external diameter |
Through hole / blind hole, effective thread depth, pilot hole depth, pilot hole diameter / pre-turning diameter, entrance / exit. |
Hole position, wall thickness, concentricity. |
Determine straight flutes, pointed flutes, spiral flutes, roll form, or thread dies. |
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Equipment |
Machine model, spindle, synchronized feed, toolholder, clamping, overhang, speed / feed capability. |
Program, tool compensation, spindle load. |
Determine thread tap, machining-center milling cutter, or thread milling wheel interface. |
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Cooling and lubrication |
External cooling / internal cooling, pressure / flow rate, oil product / concentration, coolant supply direction. |
Coolant records. |
Determine internal cooling, coating, interrupted thread structure, and friction risk. |
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On-site issues |
Chip clogging, built-up chips, broken thread, tool breakage, burrs, dimensional drift, poor go/no-go gauge results, sealing failure. |
Photos, videos, torque / load curves. |
Infer the priority technical path from symptoms. |
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Production targets |
Trial production / mass production, monthly output, takt time, tool-change method, acceptable rework rate. |
Cost baseline, tool-change records. |
Compare by total cost rather than single-tool price. |
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Verification requirements |
Thread gauge, thread form, pitch diameter, assembly, torque, sealing / pressure, life records. |
Inspection reports, customer specifications. |
Establish verifiable delivery conditions. |
D. Usage Precautions
Before product use, clearly explain the system conditions most likely to cause misjudgment or failure. Content must be divided into three stages: “Before machining,” “During machining,” and “After machining,” and must indicate which problems can be improved by the tool and which require joint confirmation of machine, clamping, and cooling.
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Stage |
Precaution |
Applicable Product Scope |
Verification / Record |
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Before machining |
Check the standard, size, pitch / lead, tolerance, internal/external thread, and thread form. |
All products. |
Drawing, catalog, thread gauge. |
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Before machining |
Confirm material grade, hardness, heat treatment, ductility, and chip behavior. |
All products; especially important for roll form. |
Material and batch data. |
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Before machining |
Measure pilot hole, hole depth, pre-turning diameter, roundness, concentricity, and entrance condition. |
Thread taps, thread dies, milling cutters. |
First-piece dimensions and photos. |
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Before machining |
Confirm tool, toolholder, clamping, overhang, runout, and spindle synchronization. |
All products. |
Clamping inspection checklist. |
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During machining |
Manage the selection of straight flutes, pointed flutes, and spiral flutes according to hole type and chip direction. |
6 types of thread taps. |
Chip form, hole-bottom condition. |
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During machining |
Roll form thread taps must control forming load, pilot hole, and lubrication; low chips must not be considered equivalent to low load. |
Solid carbide / HSS-Co roll form. |
Torque, temperature rise, thread form. |
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During machining |
Internal cooling must confirm coolant supply pressure, flow rate, channels, and coolant condition. |
Thread taps, thread dies, thread mills. |
Coolant supply records and chip evacuation results. |
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During machining |
External-thread tools must manage pre-turning diameter, center position, toolholder, fine adjustment, and concentricity. |
2 types of thread dies. |
Adjustment amount, runout, burrs. |
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During machining |
Machining-center thread mills must manage the toolpath, tool compensation, tool entry/exit, and tool wear. |
Thread mills. |
Program version and tool compensation. |
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During machining |
Thread milling wheels must confirm rotary tool axis, equipment interface, synchronization ratio, and specification matching. |
Solid carbide thread milling wheels. |
Takt time, thread form, outside diameter / pitch diameter. |
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After machining |
Appearance alone is insufficient; go/no-go gauge, thread form, dimensions, and assembly must be inspected according to functional requirements. |
All products. |
Inspection report. |
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In case of abnormality |
First stop using incorrect assumptions, and troubleshoot in the sequence of material → chips → tool → equipment → inspection. |
All products. |
Abnormality history and photos. |
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Content Pillar |
Suggested Subtopics |
Directed Products / Tools |
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Selection of common thread specifications and dimensions |
M, W, UN / UNC / UNF, BSP / G / PF, R / Rc / PT / BSPT, NPT / NPTF, ACME / Tr, BUTT; dimensions, pitch, lead, tolerance, pilot hole, and inspection gauges. |
13 products allocated according to standards and operating conditions. |
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Thread machining issues |
Long chips, chip clogging, chip packing at the hole bottom, exit burrs, built-up chips, broken thread, tool breakage, torque increase, dimensional drift, external-thread adjustment, equipment synchronization. |
Straight flutes, pointed flutes, spiral flutes, roll form, interrupted thread structure / internal cooling, thread dies, milling cutters, thread milling wheels. |
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Thread quality-control issues |
Poor go/no-go gauge results, incomplete thread form, pitch diameter deviation, lead error, assembly sticking, sealing / pressure failure, transmission / load-bearing failure. |
Product pages, inspection gauge pages, and requirement confirmation form. |
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# |
Product Category |
Core Technology and Features |
Priority Application Conditions |
Materials / Industry Entry Points |
Engineering Limits and Validation Focus |
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01 |
Solid Carbide Straight-Flute Thread Tap |
Solid carbide; straight flutes; can be configured with dedicated cutting edge clearance, thread back-relief, and cutting angle; evaluated according to material parameters #C |
Short chips, short threads, partially through holes; applications requiring cutting-edge strength and dimensional retention |
Brass, die-cast aluminum, cast iron, ductile cast iron, phenolic / engineering plastics; plumbing hardware, valves, pneumatic components, machine parts |
Solid carbide does not compensate for misalignment, excessive overhang, or incorrect tap drill holes; validate chips, torque, thread profile, GO/NO-GO gauges, and wear |
|
02 |
Solid Carbide Spiral-Flute Thread Tap |
Solid carbide; spiral flutes evacuate chips toward the hole entrance; #C, internal cooling H, interrupted thread structure #X, and TiCN / Ti can be evaluated |
Long chips, blind holes, deep threads, risk of chip clogging at the hole bottom and scratching during withdrawal |
Stainless steel / special steel, aluminum alloys, copper alloys, carbon steel / alloy steel; automotive, valves, precision machinery, energy equipment |
Spiral flutes are not an automatic guarantee of chip evacuation; validate helix angle, hole depth, tap drill hole, cooling, torque, hole bottom, and dimensional drift |
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03 |
Solid Carbide Pointed-Flute Thread Tap |
Solid carbide; pointed flutes push chips forward; can be configured with internal cooling, interrupted thread structure, coating, and dedicated clearance |
Through holes, exit quality, and cases where chips must leave the machining zone; short chips or some long chips must be judged based on actual testing |
Aluminum alloys, copper alloys, steel materials, cast materials; automotive, hardware, valves, machine parts |
Not equivalent to a blind-hole spiral-flute thread tap; validate exit burrs, thread profile, chip forward-pushing behavior, concentricity, and assembly |
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04 |
Solid Carbide Roll Form Thread Tap |
RFT.SC; plastic forming; dedicated roll-form clearance, thread back-relief, and cutting angle; internal cooling and coatings can be evaluated |
Materials with sufficient ductility, applications requiring low-chip / nearly chipless processing, and cases where chip clogging is the primary risk |
Ductile aluminum alloys, copper alloys, low- / medium-carbon steels, etc.; grade and condition must be confirmed first; automotive, electronic hardware, mass-production machinery |
Not the default solution for brittle materials or materials with insufficient ductility; tap drill hole, forming torque, lubrication, springback, thread profile, and GO/NO-GO gauges are threshold items |
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05 |
Welded Carbide Straight-Flute Thread Tap |
Welded carbide; straight flutes; functional division between carbide cutting section and base material; clearance and cutting angle can be configured according to material |
Short chips, short threads, controllable load, and applications seeking a cost / function balance |
Brass, aluminum, cast iron, engineering plastics; plumbing hardware, valves, pneumatic components, and general machine parts |
For small sizes, long overhang, high torque, or high precision, check base-material support, welded area, and runout; validate part count, wear, and rework |
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06 |
Welded Carbide Spiral-Flute Thread Tap |
Welded carbide; spiral flutes; material division balances chip evacuation and cost; #C, internal cooling, interrupted thread structure, and coatings can be evaluated |
Blind holes, long chips, and deep threads, provided rigidity and load remain within the range that welded carbide can withstand |
Stainless steel, copper alloys, aluminum alloys, carbon steel; automotive, valves, precision machinery |
Do not select solely because the hole is blind; validate welded area, torque, hole bottom, chips, thread surface, and life, and compare total cost against solid carbide |
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07 |
HSS-Cobalt Spiral-Flute Thread Tap |
HSS-Co direction; spiral flutes; official page discloses #C, internal cooling H, interrupted thread structure #X, TiCN; focus on toughness and material matching |
High toughness, long chips, blind holes, and chip-breaking risk at the hole bottom; suitable for initial evaluation from the combination of toughness and chip evacuation |
Stainless steel, special steel, carbon steel / alloy steel, etc.; grade, hardness, and work hardening must be confirmed; automotive, energy, general mass production |
Do not claim guaranteed chip breaking or no tool breakage; validate material condition, spiral direction, chip length, torque, cooling, and wear |
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08 |
HSS-Cobalt Roll Form Thread Tap |
HSS-Co roll form; dedicated roll-form clearance, thread back-relief, and dedicated oil grooves; can be configured with internal cooling and coatings |
Material plasticity and forming load are acceptable, and low-chip forming must be evaluated with a toughness / cost balance |
Ductile materials such as aluminum, copper alloys, and low-carbon steel; electronic hardware, automotive parts, general mass production |
Forming load may be higher than cutting; validate tap drill hole, lubrication, torque, springback, thread profile, dimensions, and material batches |
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09 |
Adjustable Welded Carbide Thread Die |
Adjustable welded carbide; straight flutes / can be configured with pointed flutes, interrupted thread structure, dedicated clearance, and material parameters; fine adjustment and dimensional reset |
External thread dimensions require fine adjustment, resetting after tool change, GO/NO-GO gauge requirements, and downstream process requirements |
Steel, copper alloys, aluminum alloys, stainless steel, etc., confirmed according to blank diameter and load; automotive bolts, hardware, valves, machine parts |
Adjustment does not automatically improve thread profile quality; validate blank diameter, concentricity, adjustment amount, major diameter, pitch diameter, thread profile, and assembly |
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10 |
Adjustable Welded Carbide Thread Die with Shank |
Adjustable welded carbide with shank; can connect internal cooling, interrupted thread structure, pointed flutes, and dedicated material parameters |
Continuous external thread machining, toolholder positioning, center position and rigidity management; mass-production lines requiring fine adjustment |
Steel, copper alloys, aluminum alloys, stainless steel; automation, automotive, fluid components, precision machinery |
A shank does not mean full equipment compatibility; validate toolholder, overhang, runout, fluid supply, adjustment recovery time, burrs, and mass-production stability |
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11 |
Thread Mill |
Solid carbide thread mill; full-tooth / 3-tooth; straight flutes / spiral flutes; can be configured with internal cooling and Ti; completed through CNC toolpath |
CNC machining centers, high-mix low-volume production, special specifications, internal / external thread flexibility, and workpiece risk management after tool breakage |
Steel, stainless steel, aluminum, titanium alloys / high-temperature alloys, etc., must be tested according to tool grade and equipment; precision machinery, aerospace parts, energy equipment |
Toolpath, cutter compensation, synchronization, cutter diameter, and wear affect dimensions; validate thread profile, pitch, pitch diameter, surface, assembly, and cycle time per part |
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12 |
Solid Carbide Thread Milling Wheel |
Thread milling wheel; solid carbide; spiral flutes; thread parameters; general thread back-relief / cutting angle and Ti / TiCN can be used |
Cam machines / automatic lathes, CNC lathe rotary tool spindles, continuous external threading, and low-variety high-volume production |
Steel, copper alloys, aluminum alloys, pipe materials, etc., confirmed according to rotary tool spindle and specifications; bolts, pipe fittings, automotive and fluid components |
Must match equipment interface, synchronization ratio, single / combined use, and parallel / tapered threads; validate takt time, thread profile, major diameter, pitch diameter, and wear |
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13 |
Carbide Thread Die Plate |
Internal thread die plate / external thread die plate direction; planned around replaceable die plates, thread profile reconditioning, and dedicated toolholder systems |
Bolt / screw manufacturing, continuous external threading, thread profile reconditioning, or specific thread die plate systems; confirm according to product type |
Carbon steel, alloy steel, stainless steel, copper alloys, etc., confirmed according to cold forming / cutting and equipment; fasteners, automotive, hardware mass production |
Do not confuse thread die plates with thread dies or thread milling wheels as the same tool; confirm die plate holder, thread profile, material flow, pressure, wear, and finished-product GO/NO-GO gauges |
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First Decision |
Next Question |
Product Groups to Prioritize |
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Is it a through hole? |
Do chips need to evacuate forward, and is exit quality sensitive? |
Straight flutes or solid carbide pointed flutes thread taps; further route by short-chip / long-chip behavior and material. |
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Is it a blind hole or deep thread? |
Are chips long, sticky, accumulating at the hole bottom, or scratching the thread during withdrawal? |
Solid carbide / welded carbide spiral flutes thread taps; evaluate interrupted thread structure and internal cooling when necessary. |
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Does the material have sufficient ductility? |
Is low-chip machining desired, and can the tap drill hole and lubrication be controlled? |
Solid carbide / HSS roll form thread taps. |
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Are torque, friction, or temperature rise prominent? |
Can coolant supply, interrupted thread structure, clearance, and coating be verified? |
Interrupted thread structure / internal cooling / coating combinations matched to the material. |
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Are there many specifications, small batches, or special thread forms? |
Does the CNC machining center have the required path and tool compensation capability? |
Thread mills. |
➢Selection Tree for External Threads and Equipment
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On-Site Conditions |
Products to Prioritize for Evaluation |
Items to Confirm First |
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Fixed external thread size and stable tool holder |
Adjustable welded carbide thread die |
Pre-machined diameter, concentricity, thread form, GO/NO-GO gauges. |
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Shank positioning, fine adjustment, and continuous machining are required |
Adjustable welded carbide thread die with shank |
Tool holder, overhang, runout, internal cooling, and adjustment range. |
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CNC machining center; low-volume, high-mix production |
Thread mill |
Path, tool compensation, tool diameter, internal / external threads, and cycle time per piece. |
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Cam machine / automatic lathe / rotary tool spindle; low-mix, high-volume production |
Solid carbide thread milling wheel |
Synchronization ratio, interface, parallel / tapered threads, and takt time. |
|
Bolt manufacturing, thread die plate systems, or thread form correction |
Carbide thread die plate |
Thread die plate holder, equipment, material flow, thread form, and inspection gauges. |
