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Description
CROSS SECTION 20×20 mm
LENGTH 125 mm
INSERT TCMT 1604rr
ANGLE κr 90°
Technical specifications of the STFCR 20x20-16 turning tool
| Technical data | |
|---|---|
| ISO designation | STFCR 20x20-16 |
| Shank height (h) | 20 mm |
| Shank width (b) | 20 mm |
| Overall length (L) | 125 mm |
| Functional overhang (f) | 24 mm |
| Entering angle (κr) | 90° |
| Clearance angle | 7° (pos.) |
| Clamping system | ISO — center screw (S) |
| Insert type | TCMT 1604rr |
| Cutting direction | R — right-hand (L version available) |
| Manufacturer | Varel |
STFCR 20x20-16 turning tool – for facing and longitudinal turning
20×20 mm indexable turning tool for a TCMT insert
Turning tool STFCR 20x20-16 is an indexable turning tool designed for external turning on conventional and CNC lathes. The shank, with a cross section of 20×20 mm and a length of 125 mm, provides the rigidity required for industrial machining. The geometry with an entering angle of 90° allows facing and turning along a shoulder.
In the central screw clamping system (S), a screw clamps the TCMT 1604rr insert through its hole, so replacement requires loosening only one screw. The positive geometry of the 60° triangular insert with 3 cutting edges is suitable for finishing, providing low cutting forces and a smooth machined surface. The tool is compatible with TCMT 16 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the STFCR designation of the STFCR 20x20-16 turning tool
What the individual letters in the ISO designation mean
Decoding the designation STFCR
S
CLAMPING
Center screw (S)
The screw secures the insert through its center hole
T
INSERT SHAPE
60° triangle 60°
TCMT insert — positive, single-sided, 3 edges
F
ENTERING ANGLE
κr = 90°
Facing — right angle 90°
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: 20×20 mm · Insert: TCMT 1604rr
Typical applications of the STFCR 20x20-16 turning tool
Cutting operations:
| ▸ | Facing — the 90° angle provides uniform cutting of the end face |
| ▸ | Turning along shoulders — the right angle allows machining 90° corners |
| ▸ | Machining steel and cast iron — positive TCMT geometry provides low cutting forces |
| ▸ | Turning steps and flanges — machining diameter transitions |
| ▸ | CNC production runs — repeatable cutting edge positioning and quick replacement |
Included
STFCR 20x20-16 package contents
Package contents:
| ✓ | Tool body STFCR 20x20-16 | 1 pcs |
| ✓ | Center screw for clamping the insert | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | TCMT 1604rr cutting insert (sold separately) | — |
Compatible TCMT 1604rr insert
TCMT 1604rr
The cutting insert is not included in the set — must be purchased separately. TCMT insert. Positive geometry means that the insert is single-sided and has 3 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 STFCR 20x20-16 turning tool
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 1.0–2.0 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 1.5× the shank height without support |
| ▸ | 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 (3 edges in total) |
Note: Use coolant during machining — it extends insert life and improves surface finish. When machining without coolant, reduce the cutting parameters by 20–30%.
Frequently asked questions — STFCR 20x20-16
This tool accepts inserts TCMT 1604rr in any carbide grade. Select the grade to match the workpiece material: P (steels), M (stainless steel), K (cast iron), N (aluminum). You can find compatible inserts in the "Related products" section below.
The entering angle of 90° provides facing perpendicular to the axis and turning along shoulders. Suitable for machining flanges, steps and right-angle corners on the workpiece.
The TCMT insert has positive geometry (clearance angle 7°), which means that it is single-sided with 3 cutting edges. When one edge wears out, rotate the insert to a fresh edge.
Product accessories
Carbide insert TCMT 16T308 H6310 Horn
Reference: 0000006146 In stock > 10 items
€3.68
€4.53 brutto
Carbide insert TCMT 16T304 H6310 Horn
Reference: 0000007829 In stock > 10 items
€3.68
€4.53 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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