SCARFING INSERT_SPUB 19-R
Caution
Product Description
Single-sided positive square scarfing insert from Dormer Pramet with a 19.05 mm cutting edge and a straight R00 profile, designed to remove the external weld bead from square and rectangular steel and stainless-steel tubes. Made from grade 6640 MT-CVD coated WC-Co carbide for ISO P20-P40 and M20-M35.
Product identification
- ISO designation: SPUB 19-R00:6640
- ANSI ordering code: SPUB-63-M:6640
- Material ID: 7817022
- Series: SPUB 19-R (insert type B)
Reading the designation
- S: square insert shape
- P: 11° clearance angle
- 19: cutting edge length 19.05 mm
- R00: no profile radius (straight edge for flat tube faces)
- 6640: carbide grade
Usage guidance
- Use the R00 insert for square and rectangular tubes only. For round tubes, choose an SPUB 19-R insert whose profile radius matches the tube outside diameter.
- Mount the insert in a Dormer Pramet scarfing holder intended for SPUB 19-R inserts, and tighten the clamping screw securely before starting the mill.
- Set the insert so the cutting edge sits flat and parallel to the tube face. This removes the bead evenly without cutting into the tube wall.
- Index to a fresh cutting edge as soon as you notice edge wear, chipping, or a drop in surface finish.
- Grade 6640 covers steel (P20-P40) and stainless steel (M20-M35) tube materials.
Safety
- Scarfing produces hot, sharp chips. Wear safety glasses and gloves, and keep guards in place while the mill is running.
The Dormer Pramet SPUB 19-R00:6640 (ANSI code SPUB-63-M:6640) is a single-sided, positive scarfing insert for external scarfing in welded tube production. Scarfing removes the weld bead that forms when strip is shaped and welded into a tube, which leaves a smooth, even outer surface.
The radiused versions of the SPUB 19-R range are made for round tubes, but the R00 version has no profile radius. Its straight cutting edge suits the flat faces of square and rectangular steel and stainless-steel tubes.
Key features
- Square insert shape with an 11° clearance angle (positive geometry)
- Main cutting edge length 19.05 mm, insert thickness 4.75 mm
- Straight cutting edge with no profile radius (R00) for flat tube faces
- Grade 6640: MT-CVD coated WC-Co carbide covering ISO P20-P40 and M20-M35
- Heat-resistant CVD coating on a tough cemented carbide substrate for long tool life and good tube surface quality
- Central fixing hole for screw clamping in Dormer Pramet scarfing holders
Applications
- External weld-bead removal on square and rectangular tubes
- Steel (ISO P) and stainless steel (ISO M) tube materials
- Welded tube production lines in tube and pipe mills
| Brand | Dormer Pramet |
|---|---|
| Series | SPUB 19-R |
| Model | SPUB 19-R00:6640 (ANSI: SPUB-63-M:6640) |
| Insert type | Single-sided, positive scarfing insert |
| Insert shape | S - square (90°) |
| Clearance angle | P - 11° |
| Main cutting edge length | 19.05 mm |
| Inscribed circle diameter (IC) | 19.05 mm |
| Insert thickness | 4.75 mm |
| Profile radius | R00 - none (straight cutting edge) |
| Chipbreaker | None |
| Grade | 6640 |
| Material / coating | WC-Co carbide, MT-CVD coated |
| ISO application range | P20-P40, M20-M35 |
| Workpiece | Square and rectangular steel and stainless-steel tubes (outside weld bead) |
| Product name | ANSI ordering code | Material ID | Grade | Cutting edge length L (mm) | Thickness S (mm) | Fixing hole D1 (mm) | Clearance | Insert type | Profile radius (mm) | Tube |
|---|---|---|---|---|---|---|---|---|---|---|
| SPUB 19-R00:6640 | SPUB-63-M:6640 | 7817022 | 6640 | 19.05 | 4.75 | 5.15 | P 11° | B | 0 | Square / rectangular |
Top view: a square insert whose sides are all the same length. The main cutting edge length (L) is 19.05 mm, which equals the inscribed circle diameter (IC) of 19.05 mm. A fixing hole (D1) of 5.15 mm passes through the centre for screw clamping.
Side view: the insert thickness (S) is 4.75 mm. The flanks are inclined at an 11° clearance angle (positive geometry), so the top cutting face is larger than the bottom seating face. The insert is single-sided, and its cutting edges are on the top face only.
Cutting edge profile: R00 is a straight edge with no profile radius, matching the flat outer faces of square and rectangular tubes.
- L (cutting edge length): 19.05 mm
- IC (inscribed circle diameter): 19.05 mm
- S (thickness): 4.75 mm
- D1 (fixing hole diameter): 5.15 mm
- Clearance angle: 11°
- Profile radius: 0 (R00)
Choosing the profile radius
SPUB 19-R scarfing inserts come in several profile radii. Match the insert to the tube shape and outside diameter:
| Insert | Profile radius (mm) | Tube outside diameter (mm) |
|---|---|---|
| SPUB 19-R00 | 0 | Square and rectangular tubes |
| SPUB 19-R12 | 12 | 18 - 22 |
| SPUB 19-R15 | 15 | 22 - 28 |
| SPUB 19-R20 | 20 | 29 - 37 |
| SPUB 19-R25 | 25 | 37 - 47 |
| SPUB 19-R40 | 40 | 60 - 76 |
| SPUB 19-R50 | 50 | 75 - 95 |
| SPUB 19-R63 | 63 | 95 - 120 |
See the Dormer Pramet catalogue for the complete radius range.
Choosing the grade
- 6640: MT-CVD coated WC-Co carbide for ISO P20-P40 and M20-M35, for steel and stainless-steel tubes.
- T9335: MT-CVD coated, functionally graded WC-Co carbide for ISO P20-P45 and M15-M40, with a wider application range. Available in selected SPUB 19-R radii.
Other Dormer Pramet scarfing inserts
- Double-sided negative scarfing inserts such as SNMX 19-R and SNMA 1506-R have more cutting edges per insert and are used for external weld-bead removal on round tubes.