TURNING INSERT - INTERNAL GROOVING_TN R INT
Caution
Product Description
Pramet TN 11NL-R050:T8330 is a single-sided triangular insert for internal O-ring grooving, cutting 1 mm wide grooves with a 0.5 mm radius profile in left-hand direction. It is made of fine-grained WC-Co carbide with a T8330 PVD coating for steel, stainless steel and cast iron.
General information
- Manufacturer: Dormer Pramet (Pramet brand), series TN R INT for internal O-ring grooving
- Grade T8330 is a PVD coated fine-grained WC-Co carbide within ISO application ranges P25-P40, M20-M35 and K20-K40 (ISO 513 groups P, M and K)
- Compatible holders: Pramet SI-series screw-clamp internal bars for size 11 TN inserts, which the manufacturer specifies for internal threading, circlip grooving and O-ring grooving. Example: SIL 0010 K 11-1 (left hand, 16 mm shank diameter, 125 mm overall length)
Usage notes
- Use a left-hand holder to match the left-hand (L) insert
- Coolant is recommended, as it has a very positive effect on tool life
- Keep the groove depth within the maximum cutting depth of 1.3 mm
- Set the cutting edge at center height and keep the bar overhang as short as possible to reduce vibration
- Check that the bore is large enough for the chosen holder before machining
- Change to a fresh cutting edge when the radius profile shows wear, to keep the groove shape and width within tolerance
The TN R INT series from Dormer Pramet consists of internal grooving inserts for producing radius-bottom grooves, such as O-ring grooves, inside bores on lathes. TN 11NL-R050:T8330 is the size 11 version (inscribed circle 6.35 mm) with a 0.5 mm radius cutting tip, giving a 1 mm groove width and a maximum cutting depth of 1.3 mm, for left-hand cutting.
Key features
- Triangular single-sided TN insert, screw clamped through a 2.8 mm central fixing hole
- Rounded 0.5 mm radius profile for cylindrical internal grooves with a radius bottom
- Cutting width tolerance of +0.05 / 0 mm for consistent groove width
- T8330 grade: sub-micron WC-Co substrate with a relatively high cobalt content, plus a nano-layered PVD coating with gradient transitions for lower internal coating stress and higher hardness
- Covers ISO application ranges P25-P40, M20-M35 and K20-K40
Applications
- Internal O-ring grooves and radius grooves in bores
- Machining of steel, stainless steel and cast iron
| Brand | Pramet (DORMER PRAMET) |
|---|---|
| Series | TN R INT |
| Model | TN 11NL-R050:T8330 |
| Manufacturer article No. | 6755973 |
| Application | Internal O-ring / radius grooving in bores |
| Insert shape | Triangular, single-sided |
| Insert size | 11 (inscribed circle 6.35 mm) |
| Cutting direction | Left hand (L) |
| Profile radius | 0.5 mm |
| Cutting width | 1 mm |
| Max. cutting depth | 1.3 mm |
| Substrate | Fine-grained WC-Co carbide |
| Grade / coating | T8330, PVD coated (gold color) |
| ISO application range | P25-P40 / M20-M35 / K20-K40 |
| Workpiece materials | Steel, stainless steel, cast iron |
| Coolant | Recommended |
TN 11NL-R050:T8330 (article No. 6755973)
| Item | Symbol | mm | inch |
|---|---|---|---|
| Inscribed circle diameter | IC | 6.35 | 0.25 |
| Insert thickness | S | 3.1 | 0.122 |
| Fixing hole diameter | D1 | 2.8 | 0.11 |
| Corner (profile) radius | RE | 0.5 | 0.02 |
| Cutting width | CW | 1 | 0.039 |
| Cutting width tolerance | CWTOL | +0.05 / 0 | +0.002 / 0 |
| Max. cutting depth | CDX | 1.3 | 0.051 |
Top view: an equilateral triangular, single-sided insert (TN type) with an inscribed circle diameter (IC) of 6.35 mm and a thickness (S) of 3.1 mm. A central fixing hole (D1) of 2.8 mm is used for screw clamping in the holder.
- Cutting tip: rounded profile with radius (RE) 0.5 mm, giving a cutting width (CW) of 1 mm with a tolerance of +0.05 / 0 mm
- Maximum cutting depth (CDX): 1.3 mm
- Orientation: internal (N), left-hand (L) design
How to read the code TN 11NL-R050:T8330
| Code | Meaning |
|---|---|
| TN | Triangular insert |
| 11 | Insert size, inscribed circle 6.35 mm |
| N | Internal machining |
| L | Left-hand cutting |
| R050 | Profile radius 0.50 mm |
| T8330 | PVD coated carbide grade |
Choosing the right insert
- Groove shape: TN R INT inserts cut radius-bottom grooves such as O-ring grooves. For flat-bottom circlip (retaining ring) grooves, choose the TN ZZ INT type
- Groove profile: choose the radius that matches the drawing; this insert gives R0.5 mm with a 1 mm width
- Insert size: size 11 (IC 6.35 mm) suits small bores; Pramet TN inserts are also offered in sizes 16 (IC 9.525 mm) and 22 (IC 12.7 mm) for larger work
- Cutting direction: NL inserts are used in left-hand holders (SIL), NR inserts in right-hand holders (SIR)
- Workpiece material: T8330 covers steel (P25-P40), stainless steel (M20-M35) and cast iron (K20-K40), a versatile choice when one insert must handle mixed materials