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Description
DIAMETER Ø20 mm
LENGTH 200 mm
INSERT DCMT 1104rr
ANGLE κr 93°
Technical specifications of the S20R SDUCR 11 boring bar
| Technical data | |
|---|---|
| ISO designation | S20R SDUCR 11 |
| Shank diameter (d) | Ø20 mm |
| Effective height (h) | 18 mm |
| Overall length (L) | 200 mm |
| Functional overhang (f) | 14.5 mm |
| Min. bore diameter (D_min) | Ø25 mm |
| Entering angle (κr) | 93° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | DCMT 1104rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Smoxh |
S20R SDUCR 11 boring bar – for internal turning and bore finishing
Internal turning tool for machining bores from Ø25 mm
Boring bar S20R SDUCR 11 is an indexable boring bar designed for longitudinal turning and bore finishing with diameters from 25 mm. The round steel shank with a diameter of Ø20 mm and a length of 200 mm provides cutting stability even with greater tool overhang. The geometry with an entering angle of 93° allows turning along the wall with simultaneous light facing.
In the center screw clamping system (S), the screw secures the DCMT 1104rr insert through its hole, so replacement requires loosening just one screw. The positive geometry of the 55° rhombic insert with 2 cutting edges is suitable for finishing, providing low cutting forces and a smooth machined surface. The boring bar is compatible with DCMT 11 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the SDUCR designation of the S20R SDUCR 11 boring bar
What the individual letters in the ISO designation mean
Decoding the designation SDUCR
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
D
INSERT SHAPE
55° rhombus 55°
DCMT insert — positive, single-sided, 2 cutting edges
U
ENTERING ANGLE
κr = 93°
Longitudinal turning inside the bore with light facing
C
CLEARANCE ANGLE
α = 7° (pos.)
Positive geometry — low cutting forces, finishing and medium machining
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: Ø20 mm (S20R, steel) · Insert: DCMT 1104rr
Typical applications of the S20R SDUCR 11 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø25 mm |
| ▸ | Bore finishing — positive DCMT geometry provides low cutting forces and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | Light facing — the 93° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
S20R SDUCR 11 package contents
Package contents:
| ✓ | Boring bar body S20R SDUCR 11 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | DCMT 1104rr cutting insert (sold separately) | — |
Compatible DCMT 1104rr insert
DCMT 1104rr
The cutting insert is not included in the set — must be purchased separately. DCMT insert. Positive geometry means that the insert is single-sided and has 2 cutting edges, providing low cutting forces and good surface quality.
Select the insert grade to match the workpiece material: P (structural steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the section "Related products" below.
Insert installation and replacement for the S20R SDUCR 11 boring bar
Instructions for the center screw clamping system (S)
Insert replacement procedure step by step
1 Unscrew the screw
Unscrew the center screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Position in the seat
4 Tighten the screw
Torque 0.8–1.5 Nm
Important: Do not exceed the recommended tightening torque — this may damage the thread in the seat or crack the insert.
Checks before starting work:
| ▸ | Tool overhang — do not exceed 4×d (80 mm) without support; use vibration damping for greater overhang |
| ▸ | Cutting edge height — set the cutting edge at spindle centerline height |
| ▸ | Insert seat condition — check that the contact surface is not damaged or worn |
| ▸ | Secure clamping — the insert must have no play in the seat |
| ▸ | Indexing — when an edge wears out, rotate the insert to a fresh edge (2 edges in total) |
Note: Use internal coolant (through the spindle) for boring whenever possible. When machining without coolant, reduce cutting parameters by 20–30%. Long tool overhang promotes vibration — if vibration occurs, reduce the depth of cut and increase the feed.
Frequently asked questions — S20R SDUCR 11
The minimum bore diameter is Ø25 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø20 mm, the recommended maximum overhang without damping is 4×d, or 80 mm. Above this value, vibration may occur — reduce the depth of cut or use a vibration-damped boring bar.
The DCMT insert has positive geometry (clearance angle 7°), which means it is single-sided with 2 cutting edges. When one edge wears out, rotate the insert to a fresh edge.
Product accessories
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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