Build a metric assortment around the actual shank and square dimensions—not thread size alone.
This HSS straight flute machine tap series spans M2 × 0.4 to M30 × 3.5. Its 17 size-and-pitch combinations give industrial distributors a defined general metric range, separate from the DIN 371 and DIN 376 dimensional families. Straight flutes and a square drive end are the key structural features.
Dimensions are in millimetres except thread designations, drive labels and lead counts. Read each column with the dimension reference below.
| Thread / designation | Overall length L (mm) | Working / cutting length Lc (mm) | Listed diameter d (mm) | Square / drive k (mm) | Pilot reference (mm) |
|---|---|---|---|---|---|
| M2x0.4 | 51 | 15 | 2.5 | 2 | 1.6 |
| M2.5x0.45 | 57 | 17 | 2.8 | 2.1 | 2.05 |
| M3x0.5 | 51 | 15 | 3.15 | 2.5 | 2.5 |
| M4x0.7 | 57 | 17 | 4 | 3.15 | 3.3 |
| M5x0.8 | 63 | 20 | 5 | 4 | 4.2 |
| M6x1.0 | 72 | 24 | 6.3 | 5 | 5 |
| M8x1.25 | 72 | 22 | 6.3 | 5 | 6.8 |
| M10x1.5 | 80 | 24 | 8 | 6.3 | 8.5 |
| M12x1.75 | 89 | 29 | 9 | 7.1 | 10.3 |
| M14x2.0 | 95 | 30 | 11.2 | 9 | 12 |
| M16x2.0 | 102 | 32 | 12.5 | 10 | 14 |
| M18x2.5 | 112 | 37 | 14 | 11.2 | 15.5 |
| M20x2.5 | 112 | 37 | 14 | 11.2 | 17.5 |
| M22x2.5 | 118 | 38 | 16 | 12.5 | 19.5 |
| M24x3.0 | 130 | 45 | 18 | 14 | 21 |
| M27x3.0 | 135 | 45 | 20 | 16 | 24 |
| M30x3.5 | 138 | 48 | 20 | 16 | 26.5 |
Match pilot-hole preparation to the thread system, workpiece and agreed acceptance requirement.
At M6 × 1.0 this range has L 72 mm, Lc 24 mm, d 6.3 mm and k 5 mm. Compare those dimensions with the DIN families before retaining a customer’s existing holder.
Use this range for metric internal-thread requirements where a straight flute cutting tool suits the workpiece and chip behaviour. Give the material grade, hole type and full-thread depth when selecting a size. Straight flutes provide chip space but do not transport chips towards the entrance in the same way as a spiral flute.
A straight flute is not a universal through-hole-only designation. Blind-hole use depends on the cutting lead, chip space and material. Do not treat the cutting length as usable full-thread depth or select a speed from nominal diameter alone.
| Product family | Selection boundary to review |
|---|---|
| DIN 371 HSS Straight Flute Machine Tap | Keep the DIN 371 shank dimensions explicit when a customer asks for a straight-flute replacement. |
| DIN 376 HSS Straight Flute Machine Tap | Specify the reduced-shank straight-flute family without losing the drive dimensions on the order. |
| HSS Metric Spiral Point Machine Tap | Keep the chip exit clear when sourcing metric taps for through-hole work. |
Keep the selected family, thread designation and dimensional reference together. Shared nominal sizes or drive shapes do not establish interchangeability.
A general metric stock list needs to preserve the round shank and square dimensions as carefully as the M-size. Use the workshop review to discuss how the approved item list will distinguish this series from DIN replacements.
For the straight flute assortment, put complete size/pitch and the general-series reference on each requested label. If DIN tools are packed in the same shipment, identify them as separate items with their own drive dimensions.
Carry the HSS requirement with the item drawing when discussing material preparation for this range.
Keep the approved item identity and dimensional revision with components during order discussions. Use the exact thread and drive dimensions to distinguish similar tools.
Focus sample acceptance on the thread designation, cutting-section length and the round-to-square drive interface. A nominal-size check alone will not establish interchangeability with the DIN stock already held by your customer.
Use the following items to define the sample and order acceptance brief.
| Review item | What to agree | Procurement risk addressed |
|---|---|---|
| Thread identification | Nominal size, required pitch and finished-thread requirement | Avoid the wrong thread family or pitch |
| Dimensions and holding | At M6 × 1.0 this range has L 72 mm, Lc 24 mm, d 6.3 mm and k 5 mm. Compare those dimensions with the DIN families before retaining a customer’s existing holder. | Avoid holder mismatch, insufficient reach or unintended substitution |
| Geometry / set identity | Focus sample acceptance on the thread designation, cutting-section length and the round-to-square drive interface. A nominal-size check alone will not establish interchangeability with the DIN stock already held by your customer. | Avoid the wrong cutting form or incomplete member sequence |
| Sample acceptance plan | Agree the reference drawing, acceptance method and sampling requirement for the application | Make sample approval and repeat-order review refer to the same item |
For a wholesale size list, keep the pitch and L/Lc/d/k dimensions on each line. Separate general-series replacements from DIN-specified orders so a nominal M6 does not become an unintended holder substitution. Send any marking and pack-count requirements with that list for quotation review.
For the straight flute assortment, put complete size/pitch and the general-series reference on each requested label. If DIN tools are packed in the same shipment, identify them as separate items with their own drive dimensions.
Build a metric assortment around the actual shank and square dimensions—not thread size alone.
Straight flutes provide chip space along the tool; spiral flutes help carry chips towards the shank. Choose between them using material, hole form and depth, rather than assuming the same nominal thread makes them interchangeable.
Only after checking the cutting lead, available bottom clearance and chip behaviour for the workpiece. Include both drilled depth and required full-thread depth in the enquiry.
No. This M6 × 1.0 has a 6.3 mm shank and 5 mm square; the listed DIN 371 M6 has a 6 mm shank and 4.9 mm square. Check the complete holder interface.
The table runs from M2 × 0.4 to M30 × 3.5 and includes 17 combinations. Order the complete diameter-and-pitch designation; do not infer additional fine pitches from the diameter range.
No. This is the listed machine-tap series, supplied as individual sizes. A square driving feature does not specify a three-piece hand-tapping sequence.
Reference the approved thread, material and L/Lc/d/k dimensions, then state quantity and packaging by size. Keep the general series distinct from DIN 371 and DIN 376 items in the reorder list.
Send the selected thread designation, quantities and the application details below. Add a drawing or size list to keep the enquiry tied to the required configuration.