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Description
DIAMETER Ø20 mm
LENGTH 200 mm
INSERT CCMT 0903rr
ANGLE κr 95°
Technical specifications of the S20 SCLCL 09 boring bar
| Technical data | |
|---|---|
| ISO designation | S20 SCLCL 09 |
| 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) | 95° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | CCMT 0903rr |
| Cutting direction | L — left-hand (R version available) |
| Shank material | Steel (S) |
| Manufacturer | Varel |
S20 SCLCL 09 boring bar – for internal turning and bore finishing
Internal turning tool for machining bores from Ø25 mm
Boring bar S20 SCLCL 09 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 95° allows turning along the wall with simultaneous light facing.
In the central screw clamping system (S), the screw secures the CCMT 0903rr insert through its hole, so only one screw needs to be loosened for replacement. The positive geometry of the 80° diamond insert with 2 cutting edges is well suited to finishing, providing low cutting forces and a smooth machined surface. The boring bar is compatible with CCMT 09 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the SCLCL designation of the S20 SCLCL 09 boring bar
What the individual letters in the ISO designation mean
Decoding the designation SCLCL
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
C
INSERT SHAPE
80° rhombus 80°
CCMT insert — positive, single-sided, 2 cutting edges
L
ENTERING ANGLE
κr = 95°
Longitudinal turning + facing
C
CLEARANCE ANGLE
α = 7° (pos.)
Positive geometry — low cutting forces, finishing and medium machining
L
DIRECTION
Left-hand (L)
Feed to the right — from the spindle toward the tailstock
Shank: Ø20 mm (S20R, steel) · Insert: CCMT 0903rr
Typical applications of the S20 SCLCL 09 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø25 mm |
| ▸ | Bore finishing — positive CCMT geometry provides low cutting forces and a smooth surface |
| ▸ | Internal taper turning — bearing seats, internal chamfers, Morse tapers |
| ▸ | Light facing — the 95° angle allows machining the face inside the bore |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick insert replacement in the holder |
Included
S20 SCLCL 09 package contents
Package contents:
| ✓ | Boring bar body S20 SCLCL 09 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | CCMT 0903rr cutting insert (sold separately) | — |
Compatible CCMT 0903rr insert
CCMT 0903rr
The cutting insert is not included in the set — must be purchased separately. CCMT 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.
Installing and replacing the insert in the S20 SCLCL 09 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 0.6–1.2 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 — S20 SCLCL 09
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 CCMT 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
Carbide insert CCMT 09T308 H6310 Horn
Reference: 0000003710 In stock > 10 items
€3.82
€4.69 brutto
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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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