- 98% satisfied customers
- 72h delivery
- 30 dni na zwrot
Description
DIAMETER Ø40 mm
LENGTH 350 mm
INSERT WNMG 0804rr
ANGLE κr 95°
Technical specifications of the S40 MWLNR 08 boring bar
| Technical data | |
|---|---|
| ISO designation | S40 MWLNR 08 |
| Shank diameter (d) | Ø40 mm |
| Effective height (h) | 37 mm |
| Overall length (L) | 350 mm |
| Functional overhang (f) | 29.5 mm |
| Min. bore diameter (D_min) | Ø50 mm |
| Entering angle (κr) | 95° |
| Clearance angle | 0° (negative) |
| Clamping system | ISO — combination (M) |
| Insert type | WNMG 0804rr |
| Cutting direction | R — right-hand (L version available) |
| Shank material | Steel (S) |
| Manufacturer | Varel |
Boring bar S40 MWLNR 08 – for internal turning of holes
Internal turning tool for machining bores from Ø50 mm
Boring bar S40 MWLNR 08 is an indexable boring bar designed for longitudinal turning and roughing and medium machining of bores with diameters from 50 mm. The round steel shank with a diameter of Ø40 mm and a length of 350 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 combination clamping system (M), the WNMG 0804rr insert is held simultaneously by a top clamp and a pin in its hole. The negative geometry of the 80° trigon insert with 6 cutting edges is suitable for roughing and medium machining, providing high cutting edge strength and cost efficiency thanks to its double-sided design. The boring bar is compatible with WNMG 08 inserts in various carbide grades — select the grade to match the workpiece material.
Decoding the MWLNR designation of the S40 MWLNR 08 boring bar
What the individual letters in the ISO designation mean
Decoding the designation MWLNR
M
CLAMPING
Combination (M)
The top clamp and pin secure the insert simultaneously
W
INSERT SHAPE
80° trigon 80°
WNMG insert — negative, double-sided, 6 edges (3 per side)
L
ENTERING ANGLE
κr = 95°
Longitudinal turning + facing
N
CLEARANCE ANGLE
α = 0° (neg.)
Negative geometry — double-sided inserts, edges on both sides
R
DIRECTION
Right-hand (R)
Feed to the left — from the tailstock toward the spindle
Shank: Ø40 mm (S40U, steel) · Insert: WNMG 0804rr
Typical applications of the S40 MWLNR 08 boring bar
Cutting operations:
| ▸ | Longitudinal boring — enlarging and finishing cylindrical bores from Ø50 mm |
| ▸ | Roughing and medium machining of bores — negative WNMG geometry provides a strong cutting edge; for finishing, select an insert with a finishing chip breaker |
| ▸ | 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
Package contents for S40 MWLNR 08
Package contents:
| ✓ | Boring bar body S40 MWLNR 08 | 1 pcs |
| ✓ | Combination clamp (clamp + pin) | 1 pcs |
| ✓ | Hex key for insert replacement | 1 pcs |
| ✗ | WNMG 0804rr cutting insert (sold separately) | — |
Compatible WNMG 0804rr insert
WNMG 0804rr
The cutting insert is not included in the set — must be purchased separately. WNMG insert. Negative geometry means that the insert is double-sided and has 6 cutting edges, providing a stronger cutting edge and twice as many edges as a single-sided insert.
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 S40 MWLNR 08 boring bar
Instructions for combination clamping (M)
Insert replacement procedure step by step
1 Loosen the clamp
Loosen the clamping screw 2-3 turns
2 Clean the insert seat
Remove chips and debris
3 Install the insert
Fit onto the pin and press down
4 Tighten the clamp
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 (160 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 (6 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 — S40 MWLNR 08
The minimum bore diameter is Ø50 mm. In smaller bores, the tool head interferes with the machined wall, preventing proper cutting.
For a steel shank of Ø40 mm, the recommended maximum overhang without damping is 4×d, or 160 mm. Above this value, vibration may occur — reduce the depth of cut or use a vibration-damped boring bar.
The WNMG insert has negative geometry (clearance angle 0°), which means it is double-sided with 6 cutting edges. When one edge wears out, rotate or flip the insert to use the next edge — this significantly reduces tooling cost per part.
Product accessories
Carbide insert WNMG 080404 MA H6310 Horn
Reference: 0000004240 In stock > 10 items
€5.26
€6.47 brutto
Carbide insert WNMG 080408 MA H6310 Horn
Reference: 0000006088 In stock > 10 items
€5.26
€6.47 brutto
Reviews
No customer reviews for the moment.
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 |
Recommended for you
This website uses its own and third-party cookies to improve our services and show you advertising related to your preferences by analyzing your browsing habits. To give your consent to its use, press the Accept button.
Cookie preferences
Functional cookiesTechnical
Functional cookies are strictly necessary to provide the services of the shop, as well as for its proper functioning, so it is not possible to refuse their use. They allow the user to browse through our website and use the different options or services that exist on it.
Advertising Cookies
These are cookies that collect information about the advertisements shown to users of the website. They can be anonymous, if they only collect information about the advertising spaces shown without identifying the user, or personalised, if they collect personal information about the user of the shop by a third party, for the personalisation of these advertising spaces.
Analytics cookies
Collect information about the user's browsing experience in the shop, usually anonymously, although sometimes they also allow the user to be uniquely and unequivocally identified in order to obtain reports on the user's interests in the products or services offered by the shop.