A quotation that names only a model number tells you the shaft size, not the machine. In the YH model tables the number is the H-shaft diameter in millimetres, and four line families reuse that numbering with their own pipe range, wall range, motor and footprint. The eleven YH-40 rows below sit on four different lines. If your RFQ or quotation names only the number, you are one row away from buying the wrong machine.
This page works backwards from the number. Every row below is copied from the model tables. Where the tables do not state a speed, none is given — the smart stainless and laser line tables have no speed column, so no speed figure is claimed for them.
The suffix, not the number, tells you the line
The plain number repeats because it is a shaft size. The letter after it is what changes across lines, and the same letter does not mean the same thing everywhere.
- G appears only on the smart stainless line: YH-G40A, YH-G40S and YH-G40. The G forms a three-step small-bore set (Φ5.0–Φ15, Φ6–Φ31.8, Φ8–Φ51) at a shared 40 mm H-shaft.
- S appears three times with three meanings. On the smart line, YH-G40S covers Φ6–Φ31.8 mm with a 5.5×3 kW inverter motor. On the laser line, YH-40S covers Φ8–Φ31.8 mm with a 7.5+7.5 kW main motor. On the industrial line, YH-40S covers Φ6–Φ31.8 mm with 5.5+5.5 kW and a 0.5–3.0 mm wall.
- L appears only on the decorative line: YH-40L extends the 40 shaft to Φ12.7–Φ63.5 mm with an 11 kW motor.
- A appears on both the smart and the industrial lines: YH-G40A on smart (Φ5.0–Φ15 mm, 0.25–1.5 mm wall) and YH-40A on industrial (Φ5–Φ15 mm, 0.25–1.5 mm wall).
- No suffix is the normal case and still differs by line: YH-40 is Φ15–Φ50.8 mm on the laser line, Φ9.5–Φ50.8 mm on decorative and Φ8–Φ51 mm on industrial.
So "YH-40S" on a drawing could be a laser line, an industrial line or a smart line. Only the pipe range, wall and motor will settle it.
The YH-40 family, row by row
| Line | Model | Pipe Ø (mm) | Wall (mm) | Motor | Footprint (m) |
|---|---|---|---|---|---|
| Smart SS | YH-G40A | Φ5.0–Φ15 | 0.25–1.5 | Inverter 5.5×3 kW | 26×1.3 |
| Smart SS | YH-G40S | Φ6–Φ31.8 | 0.3–2.0 | Inverter 5.5×3 kW | 28×1.3 |
| Smart SS | YH-G40 | Φ8–Φ51 | 0.5–3.5 | Inverter 7.5×3 kW | 29×1.5 |
| Laser | YH-40S | Φ8–Φ31.8 | 0.3–2.5 | Main 7.5+7.5 kW | 23×1.25 |
| Laser | YH-40 | Φ15–Φ50.8 | 0.5–3.0 | Main 7.5+11 kW | 23×1.35 |
| Decorative | YH-S40 | Φ6–Φ31.8 | 0.25–1.5 | 5.5 kW | 20×1.1 |
| Decorative | YH-40 | Φ9.5–Φ50.8 | 0.25–2.0 | 7.5 kW | 21.5×1.2 |
| Decorative | YH-40L | Φ12.7–Φ63.5 | 0.25–2.0 | 11 kW | 21.5×1.2 |
| Industrial | YH-40A | Φ5–Φ15 | 0.25–1.5 | 5.5+5.5 kW | 20×1.2 |
| Industrial | YH-40S | Φ6–Φ31.8 | 0.5–3.0 | 5.5+5.5 kW | 20×1.2 |
| Industrial | YH-40 | Φ8–Φ51 | 0.5–3.5 | 7.5+7.5 kW | 21×1.3 |
Two rows start from almost the same size: the industrial YH-40A and the decorative YH-S40.
But YH-40A is a twin-drive machine (5.5+5.5 kW) for Φ5–Φ15 mm on the industrial line, which runs internal seam treatment, external seam grinding, solution annealing and eddy-current testing before marking and cut-off.
The decorative pipe tube mill runs a shorter flow — brand printing, grinding, sizing and straightening, cutting and collecting — and does not include solution annealing.
Picking between the three plain YH-40 rows
All three are 40 mm H-shaft machines. The decision is wall and use. If you weld thin decorative tube at 0.25 mm, only the decorative row goes that low. If you need 3.5 mm wall at Φ51, the smart and industrial rows do it; the laser row stops at 3.0 mm.
YH-50, YH-60, YH-80 and YH-90 across the lines
YH-50 exists on four of the six lines. Smart YH-50 is Φ25–Φ76.2 mm with 11×3 kW inverter. Laser YH-50 is Φ25.4–Φ76.2 mm with 11+15 kW. Decorative YH-50 is Φ25.4–Φ76.2 mm with 15 kW. Industrial YH-50 is Φ25–Φ76 mm with 15+15 kW.
The pipe range is close; the motor arrangement and the footprint (23×1.5 to 32×1.6 m) are not.
YH-60 is the clearest case. Smart, laser, decorative and industrial all reach Φ50–Φ114 or Φ50.8–Φ114 mm, but the wall maximum runs 5.0 mm (smart), 4.0 mm (laser), 3.0 mm (decorative) and 5.0 mm (industrial).
Motor totals run 15 kW, 37 kW, 18.5 kW and 30 kW. Footprints run from 26×1.5 m (decorative) to 32×1.8 m (smart).
YH-80 covers the same pipe band on four lines (Φ89–Φ168 for smart, laser and industrial; Φ76–Φ168 for decorative), yet the decorative row caps wall at 4.0 mm while the other three reach 6.0 mm.
Footprint runs from 32×3.5 m (decorative and industrial) to 40×3.5 m (smart); the laser row is 36×2.8 m.
YH-90 spreads in the same way. Pipe is Φ133–Φ219 on smart, laser and industrial, narrower on decorative at Φ114–Φ219.
Wall maxima are 6.0 mm (smart, laser), 5.0 mm (decorative) and 7.0 mm (industrial, per the industrial pipe mill table). Industrial alone goes to 7.0 mm on this shaft.
YH-100 has a second life on the large diameter mill: Φ219–Φ325 mm with 37×2 kW. The smart line also lists a YH-100 in the same band (Φ219–Φ325, 37×2 kW, 45×4.3 m), so that number alone is risky too.
Above it, the large diameter table continues to YH-150 at Φ426–Φ630 mm.
The HF mill does not use YH numbers
The carbon steel HF line is named by tube size, not shaft size: thirteen models from 25 Mill to 219 Mill. The 60 Mill is Φ20–Φ85 mm, not Φ50–Φ114 mm. If your enquiry says "60 Mill", that is the HF family, and the number is the top of its round-tube range, not a shaft diameter.
Its speed column runs from 40 to 100 m/min — the only line in this set with published speed data — but that data belongs to the HF mill and should not be carried over to a YH-60 stainless line.
How to write it into your RFQ so two quotes compare
State the line family and the model row together, plus the spec that drives the choice. The decorative quote FAQ asks for pipe diameter range, wall thickness, stainless steel grade, planned monthly output and workshop size.
The HF model FAQ asks for pipe diameter range, wall thickness and target speed. The tooling quote checklist needs the mill model or brand and the pipe size range.
A line that survives all three lists looks like this:
Smart stainless line, YH-60 row: Φ50–Φ114 mm, wall 1.0–5.0 mm, 304 or 316L strip, round and square, workshop length and width of at least 32 × 1.8 m.
That figure is the YH-60 footprint on the smart table. Add the same detail to a competing offer and the two quotes describe the same machine class.
If the line family is still open, the stainless steel tube mill category and the laser welding line page show the flow each line runs, so you can compare against your product mix.
Check your quotation against the row
Take the model name in your quotation, find the row above, and test three things: does the pipe range cover your largest and smallest size, does the wall maximum cover your thickest tube, and does the motor arrangement match the line family you expect.
If one of these fails, the quotation is for a different line from the one you thought.
Send the quotation and your pipe spec to the YH engineering team through the contact page and we will map it to the exact row and confirm the configuration in writing.