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Multi-Rail RM System modules

The basic components of the Multi-Rail system are a base rail (RM-), clamping modules (RMC-) and stopper modules (RMS-).
To locate and position the workpiece side guides (RMG-) and parallels/riser blocks (RMP-) are used.

Multi-Rail RM clamp modules (RMC-)

All the jaw types, such as serrated (R), smooth (S), diamond-coated (D), additional piece models (T), grip models (G), self-aligning (B), machinable (M), etc., are suitable for the Multi-Rail RM system.

D-size (12 mm or 1/2" bolt) and B-size (M8 or 5/16" bolt) clamps are most commonly used in the Multi-Rail RM system.

RMC overview foto 1 w800

There are various clamp modules - RMC-DR, RMC-DS, RMC-DT, RMC-BS. 

In the RMC-ab code format a=size and b=jaw type.

Quick adjustable stopper plate PDQ-S1

Files to download
Dimensionsicon pdf

speedplate 1

speedplate anim740

This “speed plate” option enables users of Multi-Rail RM to move clamp modules on the rail into a different position in just a few seconds.
It also replaces one stopper module, and works with RMC-DS and RMC-DR.
Please notice this module holds clamping force in one direction only.


This clamp module features a D-series clamp with two serrated jaws.

Files to download
Dimensionsicon pdf




This clamp module features a D-series clamp with two smooth jaws (S).

In the clamp modules RMC-DSx, one jaw is smooth and another jaw is of another type.  For example, in RMC-DSR one jaw is serrated.


 CodeDim. STEP
RMC-DSicon pdf
RMC-DSRicon pdf






DOTFORCE clamp module RMC-DS-F

A Clamp module with clamping force verification

Files to download
Dimensionsicon pdf

rmc ds f dotforce clamp module ani

dotforce ani4



OK-VISE’s novel DOTFORCE concept is a part of the Multi-Rail RM system and is based on a simple visual red dot in the clamp module. The red dot disappears when the clamping force is high enough.
The parts of the module are

  • DK2-VTI wedge
  • DOTFORCE bolt
  • UDP-RM1 Plate
  • T-nut
  • Smooth jaws*

Please note that the jaws can be easily changed to any other combination.


The clamp module RMC-TTx features a D-series clamp with two jaws for an additional piece (T). 

In the clamp modules RMC-DTx, one jaw is for additional piece jaw and another one is of another type. For example, in the RMC-DTS one jaw is smooth.

 CodeDim. STEP
RMC-DTicon pdf
RMC-DTSicon pdf
RMC-DTRicon pdf





This clamp module features a B-series clamp with two serrated jaws.


Files to download
Dimensionsicon pdf




This clamp module features a B-series clamp with two smooth jaws.


Files to download
Dimensionsicon pdf






This clamp module features a B-series clamp with one smooth (S) and one serrated jaw (R).

Files to download
Dimensionsicon pdf




T-slot sets for clamps

Some clamp types for the RM system already have a code, for example, RMC-DR or RMC-DS. Code is defined as a set of letters and numbers given to a product, where the letters and numbers are abbreviated attributes that distinguish one product from another as size, product type, jaw type, etc. If you cannot find a suitable product code from our price list, please create your own code.

 All B- and D-series clamps and combinations are suitable for the Multi-Rail RM system.

Below are some examples of how to read the code: 
Adapter RMA-D1 includes a T-slot nut and bolt for D-size clamps.
Adapter RMA-BP1 includes a T-slot nut, bolt and riser plate to lift up the clamp (B-size).

Please note that using B-series clamps on Multi-Rail without a plate is not recommended.

rma d1RMA-D1rma bp1RMA-BP1rma b1RMA-B1

RMA-D1icon pdf


rma app1

Rotation stop plate PRD-1

Files to download
Dimensionsicon pdf

upd rm1

This plate is used with D-series clamps to prevent the clamp rotating on the rail.

Rotation stop plate PRD-2

Files to download
Dimensionsicon pdf

prd 2

This plate is used with D-series clamps to prevent the clamp rotating on the rail. It will lift up the clamp 1 mm ( =plate thickness) from the rail.



prd 2 app h200


Base rail RM common properties

Compared to similar systems on the market, the OK-VISE Multi-Rail base is the most stable due to its steep serration profile. It has been designed for D- and B-series clamp modules and can withstand up to 4 tonnes clamping force. The pitch of the serration is 2,5 mm, and the size of the RM profile is 44 x 50 mm.
The accuracy from every serration to the positioning hole is ± 0.01 mm.

RM base 1RM xview 1

Files to download
Installation on grid platformicon youtube



Base rail RM-100

This is the shortest rail, with two 12 mm H7 positioning holes. 

Files to download
Dimensionsicon pdf



Base rail RM-200 

Files to download
Dimensionsicon pdf

A rail 200 mm in length provides better adjustability than the shortest RM-100 rail.



Base rail RM-300 

Files to download
Dimensionsicon pdf

This length rail is most commonly used to replace old-fashioned machine vises.



Base rail RM-400

On Multi-Rail base rails L=400...700 mm, positioning hole is the second one from the end of each rail. Please note that the end of the rail is different from the start. The numbering of the scale starts from the left.

Files to download
Dimensionsicon pdf




Base rail RM-500 

Files to download
Dimensionsicon pdf

A good universal rail for VMC and HMC machining.



Base rail RM-600 

Files to download
Dimensionsicon pdf

This rail length is very popular on tooling blocks.



Base rail RM-700

Files to download
Dimensionsicon pdf

This is the longest standard rail produced by OK-VISE. Special length rails (also longer than RM-700) are also available.


Multi-Rail RM stopper modules (RMS-)

RMS overview foto 1 w800The same jaw types used in clamps are available in the stopper modules:

  • Serrated (R)
  • Smooth (S)
  • Diamond-coated (D)
  • Additional piece models (T)
  • Grip models (G)
  • Self-aligning (B)
  • Machinable (M)
  • Equipped with vertical V-slot (V)
  • Equipped with horizontal V-slot (H)  etc.

Recommended installation torque 50..100 Nm

Please also notice, that several types of threads and notches can be machined to stoppers to help integration with external components ( see more : machining options )

Additionally, different stopper sizes are manufactured by OK-VISE.

Files to download
Installationicon youtube




 CodeDimensions STEP
 RMS-Sicon pdf
 RMS-S2icon pdf
 RMS-S3icon pdf

The most common stopper is RMS-S, which has two smooth and nitrided jaws. It is optimal for the second setup, when OK-VISE clamps are used with full force. Friction level is adequate even for roughing and other types of machining where high forces occur.

The accuracy from every serrration to the jaw surface is ± 0.01 mm.

RMS-S2 is more narrow than RMS-S, about the size of a B-series clamp.

RMS-S3 is higher than RMS-S. 


Grip stopper RMS-G4

RMS-G4 is a grip model, where both jaws posses a knife-edge grip pattern. The jaws are nitrided.

Grip stopper RMS-G4S

Files to download
Dimensionsicon pdf

rms g4sRMS-G4S

RMS-G4S is a grip model, one jaw possessing a knife-edge grip pattern while the other jaw is smooth. The jaws are nitrided.


Files to download
Dimensionsicon pdf


This stopper type has two round, serrated contact areas which hold both big and small workpieces firmly in the correct position.

 The accuracy from every serrration to the jaw surface is ± 0.25 mm.



Files to download
Dimensionsicon pdf

Stoppers that have -ab at the end of the product code are in most cases combinations of two different jaws.

For example, in the RMS-SR model, one jaw is serrated (R) and another one is smooth (S).


Files to download
Dimensionsicon pdf


This stopper type has a serrated contact area on both sides of the stop module. The contact area is nitrided.

One popular variation is a stopper RMS-SR2 which has one serrated (R2) and one smooth (S) jaw.





This stopper has one jaw that is serrated ( like in RMS-R2) and the other is smooth.



 CodeDim. STEP
 RMS-Micon pdf

RMS MSRMS-MSThese are machinable stopper models which are especially suitable for machining of complex workpieces, or when extreme accuracy is needed and product-specific jaws are used for machining.

RMS-M has two extended jaws that are machinable. Furthermore, all combinations can be machined because these models are made of the relatively soft material (HRC 30, not hardened or nitrided). In the RMS-MS model, one jaw is of  the "normal" length, and normally it is smooth. For machining purposes this model is slightly bigger in size.

Also many other variants of combinations can be made, so "x" can be =R ( serrated), V (vertical slot) etc.


 CodeDim. STEP
 RMS-Dicon pdf


These stopper modules have at least one jaw which is diamond coated (D). In the RMS-D model both jaws have a diamond coating, while RMS-DS has one jaw that is smooth. 

The accuracy from every serrration to the jaw surface is ± 0.25 mm.


 CodeDim. STEP
 RMS-Gicon pdf
 RMS-GSicon pdf

RMS GSRMS-G is a grip model with two HSS pins that penetrate into the workpiece, leaving tiny marks on it. The friction is much higher than that of using the standard serrated jaw, against soft steel the friction co-efficient factor is up to 0,8.

Model RMS-GS has one grip jaw and one smooth jaw.


 CodeDim. STEP
RMS-Ticon pdf
RMS-TSicon pdf
RMS-TRicon pdf

In this stopper module the same additional pieces can be used as in D-series low-profile clamps. In this stopper module the same additional pieces can be used as in D-series low-profile clamps.

RMS-T has two additional pieces jaws. RMS-TS has one smooth jaw (photo) and one additional piece jaw. In the RMS-TR module one jaw is serrated and another one is an additional piece jaw.




 CodeDim. STEP
 RMS-Hicon pdf
 RMS-HSicon pdf 


This model has a horizontal V-shape jaw to hold small round-shaped workpieces or bars. 

RMS-H has two such jaws. In the RMS-HS module one jaw is smooth and another one - V-shape.



 CodeDim. STEP
 RMS-Vicon pdf
 RMS-VSicon pdf

rms vs f1RMS-VSThis model has a vertical V-shape jaw to hold round-shaped workpieces of various sizes.

The optimal workpiece sizes are given in the Dimension drawings (see Dim. in the table above). Please note that when machining a workpiece with a diameter larger than maximum given in the Dimensions drawings, there is a line contact between the jaw and the workpiece, and the jaw is likely to leave marks on the workpiece surface.

RMS-V has two such jaws, RMS-VS has one smooth jaw (photo).

Multi-Rail RM parallels (RMP-) and riser blocks

Like side guides, Multi-Rail RM parallels are used to assist in positioning workpiece on the Multi-Rail. Multi-Rail RM parallels are placed on the rail, thus protecting the rail's serration.

RMP 1 ap1

RMP J1 ap1 resize 


Files to download
Installationicon pdf





Magnet parallel RMP-MG1

Files to download
Dimensionsicon pdf

rmp m1

A parallel plate 5x15 mm in size with a width of 44 mm.
On one side there are two magnets, so this parallel plate can be easily fastened on a stopper (height 15 mm) or on a fixturing base such as Multi-Rail (height is then 5 mm).

This version is ground.


RMP-1 is the most common parallel model.

Files to download
Dimensionsicon pdf
STEP (3D) 

RMP 1 resize 



RMP-1H8 is a 8 mm high variation of RMP-1.

Files to download
Dimensionsicon pdf
STEP (3D) 

RMP 1 resize 




Files to download
Dimensionsicon pdf
STEP (3D) 




RMP-J1 is equipped with a snap-on spring to speed up assembly process.

Files to download
Dimensionsicon pdf
STEP (3D) 

RMP J1 resize




Multi-Rail RM side guides (RMG-)

Side guides are designed to assist in positioning the workpiece on the Multi-Rail. The workpiece is pressed sideways (as regards the clamping force) against the guide, either manually or using a spring guide.

Magnet side guide RMG-M1

Files to download
Dimensionsicon pdf

A combination of side guide RMG-1 and magnet M-1. This side guide can be moved rapidly from one place to another.
Using this type of side guide users can adjust each side guide for a specific product and keep the guide ready for the next production batch.

magnet side guide






Files to download
Dimensionsicon pdf

Side guide offset from the side of the rail is from -5 mm to +30 mm.

RMG 1 f1

Load assistant

Files to download
Dimensionsicon pdf

RMGS 4X2 2 300X400

Load assistant RMGS-4x2 holds the workpiece on the rail while operator is loading the workpieces. This saves time and muscles. Parallels with min. 8 mm height are recommended to be used with this unit (like RMP-1H8 in the photo right)

4 pcs of metal pins posses 100 N spring power each.


RMGS 4X2 app1 300x400RMGS 4X2 app2 300x400RMGS 4X2 app3 300x400

Side guide magnet M1


A magnet block with M6 thread. This is originally designed as an option for side guide RMG-1.

Machining options

The Multi-Rail dimensions can be also modified. OK.VISE has predefined set of ready machining options, which are available on request. Usually, ordering of the special machining option slightly increases delivery time.



This set of threads (4 pcs of M6) is typically used with Multi-Rail RM stoppers, in this example case with RMS-S
Then, for example side RMG-1 can be installed to the stopper instead of Mult-Rail base.

M6X4 1



rm maching options

In the picture on the right M-N1 stands for machining of two sides with max 4x9 mm notch.
Then, both stopper widht and the widht of the upper part of the rail base will be 36 mm.







M T1

Four slots for keys, where the lower part of the key chosen by the T-slot widht.

Using the slot and keys ( not included ) the module - typically Multi-Rail base - can be installed parallel or perpendicular to T-slots.


Measures to be defined at order :

Slot widht : 18 or 20 mm
Slot midpoint position






Multi-Rail RM adapter sets

The following adapter sets are recommended for use in the installation works of the Multi-Rail systems on the different platforms.




The set AD-RM-n includes n pieces of bolts, where 2 bolts are type OKSB12-45 and the remaining ones (n-2 pieces) are of type DIN912M12X45.

Fastening clamps

This is an option which is typically used to fasten components to a base (typically a T-slot table) in cases where the component cannot be bolted directly.

ICI-12 For Multi-Rail RM
IC1-12-C For Combo-Rail

Both of these can be used with M12 and 1/2" bolts

fastening clamps

In the picture above the clamps have a hole for M16 bolts ( ICI-16 )

Threads and positioning holes on the platforms

When a Multi-Rail system is installed on the grid or blank platform, most typical way of installation is to use two shoulder bolts for positioning and DIN912 bolts for remaining holes.

Shoulder bolt requires a precise 12 mm hole. Additionally, bushings and/or threaded inserts can be used.
For the standard bolts simple M12 thread is needed. In aluminium platforms, threaded inserts are recommended.

Inserts and platforms are available through the OK-VISE global distribution network.

M12 threads


OK-VISE Oy has again taken a major step in fixturing technology

Particularly when clamping is automated, most typically by using robots to load work pieces into machining centers, verifying the proper clamping force has been a challenge.
In manual clamping systems torque measurement is often used. This is a straightforward and easy method, but the relation between the torque and the actual clamping force can be inaccurate.

With hydraulic clamping oil pressure is easy to measure. However, even here there are several other variables that influence the clamping force. To name just one example, when the hydraulic cylinder is at the bottom of the stroke the oil pressure goes up, but the work piece is not necessarily clamped at all!

The approach that OK-VISE has taken is to integrate clamping force measurement directly into the stopper of the Multi-Rail RM system. Multi-Rail is part of the OK-VISE Fixturing Concept, which includes several modular fixturing systems for various purposes.

This digital concept is designed to be an integral part of any system where verifying clamping force is essential.


Basic components of the system are

  • A stopper of RMS type with DIGIFORCE option
  • DIGIFORCE display
  • SCADA System ( optional, to collect history data )

Digiforce display DFD-1

Includes power adapter 220 VAC to 24 VDC (European regulations)
Standard Modbus connection to SCADA

A stopper with DIGIFORCE option RMS-DF-1

Some Multi-Rail RM stoppers can be ordered with this DIGIFORCE sensor option


Please notice : stopper is sold separately


This optional system collects information from several DIGIFORCE displays so that the history data can be viewed and adjustments made if needed.

Download the brochure

core 2017 fixturing16