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SVn - from Ø 105 to 600 mm NAREX
205bh - Fine boring head NAREX
205bh - Fine boring head  NAREX

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Product description SVn - Modular boring system


SVn - legend

SVn - legend

1 - body

2 - arm

3 - boring unit (tool)

VK - exchangeable taper shank type milling arbour

Way of the dimension adjustment

  • by the regulating engine (adjuster)

  • by the check gauges ("Johansson")

Basic operations

  • boring of the round holes from Ø 105 to Ø 600 mm with accuracy IT7 with finishing element

Enlargement of possibilities

  • Using of finishing element SANDVIK (micrometric adjustment)

  • Using of counterbalance during finishing operations (boring by micrometric element)


SVn – modular boring system for ranges of holes from Ø 105 to Ø 600mm. Set SVn is used for boring of blocked, rough or other way prepared holes. It is rigid tool with two contrary tools which are embedded in longitudinal groove because then they can be shifted during adjusting of boring diameter. That is why the highness “L” by one set of tools 3/1+3/2 and 4/1+ 4/2 differs for 1 mm, can be adjusted to each of both set of tools own chip deepness. Maximal deepness on one tool is 8 mm. During blind holes boring can sometimes interfere different length of tools, then we recommend to order two sets of same tools and couple them on one length.

When both screws clamping the tool are loosed, the tool can be shifted in body's or arm's longitudinal groove. On cheeks of tools, arms and bodies are ground surfaces which can be used for measuring-in position during their shifting if there isn't used adjusting apparatus. Among these ground surfaces can be astricted e.c. block gauge which is adjusted on given length of tool. Finishing tool works separately with counterbalance and can be used for hole finishing in accuracy IT7.




SVn 380 - boring NAREX


SVn 90 - boring NAREX


SVn 380 - boring NAREX

  SVn 380 Ø260-380mm   SVn 90 Ø105-160mm   SVn 380 Ø150-260mm

SVn - Modular boring system NAREX





  SVn Ø105-600mm        











General Dealers Czech Republic


  • M & V, spol. s r.o. (Vsetín)

4. května 288, CZ-755 01 Vsetín

tel:  420-571 484 817

fax: 420-571 413 126

  • TTI, s.r.o. (Brno)

Údolní 40, CZ-602 00 Brno

tel: 420-543 216 868

fax: 420-543 249 300

  • Stim Tools, a.s. (Brno)

Bratislavská 49, CZ-602 00 Brno

tel: 420-545 212 092

fax: 420-545 211 163

  • HOFMEISTER s.r.o. (Plzeň)

Mezi ploty 12, CZ-326 00 Plzeň

tel: 420-377 242 058

fax: 420-377 243 161

  • BOS HK a.s. (Teplice)

Přítkovská 152, CZ-417 12 Teplice-Proboštov

tel:  420-417 560 721

fax: 420-417 560 385

  • HANÁK NÁŘADÍ, s.r.o.

Osvobození 129, CZ-763 16 Fryšták

tel: 420-577 110 711

fax: 420-577 110 733


  • NTV - Naradie, s.r.o.

Farská 86/2

SK-019 01 Ilava

phone: 421-424 466 316

fax: 421-424 464 279

  • M&V, Slovakia spol. s r.o.

Vsetínská cesta 1487-9

SK-020 01 Púchov

phone: 421-424 634 548

fax: 421-424 634 549


Sumracná 27

SK- 821 02 Bratislava

phone: 421-243 338 080

fax: 421-243 335 501


Horská 1311/2

SK-958 06 Partizanské

phone: 421-387 491 373

fax: 421-387 491 373


Frequently asked questions (FAQ)

  • What is use of boring tools set SVn?

SVn is rigid doubletools boring instrument which is designed for boring of molten, rough or blown slots - through or blind. During using finishing tool is possible to finish prebored slot with an accuracy of IT7.

  • What heads can be used in automatic cycle on NC and CNC machines?

All except universal boring heads Vhu which need direct staff. There are operation during buttoned shog on Vhu. All other operations - boring can be realized on NC and CNC machines.

  • How can be ordered this set SVn?

We recommend you to order this set SVn according to the catalogue (separately parts which are given in catalogue Boring tools on page 17 ). Variant scheme shows which parts is possible to complete in each from four ranges.

  • What does it mean for example for range SVn260 - 380?

It is boring tool for range 260-380mm, completed from following parts: arbor work for milling angel heads - part yellow, body 1/2 - part lilac, 2pcs shoulder 2/1 - part darkblue, tools equipment - parts light blue.

  • What does it mean tools equipment SVn 90?

Tools equipment SVn 90 consists of :
set of inside corner tools - mark 3/1 + 3/2
set of inside rougher tools - mark 4/1 + 4/2

  • What is difference between tool 3/1 and 3/2?

There is difference in length - 1mm. For a first time starts tool 3/1 taking off splinter and after boring slot of length 1mm starts working tool 3/2 as well. This tool 3/2 has arranged its depth of splinter different from right tool.

  • How deep can be slots bored?

Usually to the deepness according to heads accessories. There are bars, holders and boring tools. Their length you find in relevant catalogue or here (Basic operations with SVn).

  • Is it possible to use tools from SVn90 to SVn380?

It is impossible, tools for SVn90 are smaller and have different form.

  • Why is for range of SVn 150-260 necessary different body than for range of SVn 260-380?

It is because of the clamping need - in first case tool clamping and in second case shoulder clamping.

  • Are given maximum revolutions for boring heads SVn NAREX?

500 RPM by Modular boring system SVn.

  • What does adjust boring diameter on SVn?

Adjusting machine or by measuring of tool extrusion and measuring of boring slot. Tools, shoulders and bodies have on their ground surface mounting between which can be insert for example end gauges.

Product repairing



NAREX MTE standardly provides repairs of produced and delivered products. There are guarantee repairs or normal non guarantee repairs. During repair is product dismounted, there are found defective parts and up to it is determined range and price of repair. After customer´s repair price confirmation are defected parts exchanged, product is again mounted and tested.

Repair speeding

For repair speeding and lower price is suitable to enclose to repair order letter with information about problems (during which conditions defects occurs or indicate required range of repair).

Repair ordering

For repair ordering you should send product for repair, order of repair and specifications of defects on our address:


sales department

Moskevska 659/63

CZ-101 00 Prague 10
Czech Republic

Information about repair

About repair you will be informed by e-mail or by phone, with any questions you can contact export department on phone: +420 246 002 249, e-mail:, fax: + 420 246 002 335


NAREX MTE s.r.o.

Moskevska 659/63

CZ-101 00 Prague 10
Czech Republic




+420-246 002 321

+420-246 002 249

+420-246 002 335

+420-246 002 343



  Technical support is at the disposal of you on phone +420 246 002 249 or you can contact us by e-mail: or by fax: +420 246 002 335.


Basic technical information you can find also on reference service.


NAREX MTE s.r.o.

Moskevska 659/63

CZ-101 00 Prague 10
Czech Republic




+420-246 002 321

+420-246 002 249

+420-246 002 335

+420-246 002 343


  Catalogue of boring tools - Download (PDF)
  • Catalogue of boring tools (PDF)






  Modular boring system SVn - Catalogue (PDF)
  • Modular boring system SVn (PDF)






  205bh - Fine boring head - Catalogue (PDF)
  • Precision boring head 205bh (PDF)



Display of products lines (quick reference)
  • Display of products lines (quick reference)

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