• Special Screws
  • Functional Screws


Clamping Screws(Guide type/Ferrosoferric Oxide Film)

  • Fixing/Positioning

Hints for Correctly Using NBK Products

The video is an example using SLEC-A-EL(SLEC-A-EL). You can perform the same operation using this product.

Dimension Drawing

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)寸法図



M (Coarse)
Nominal of Thread

Unit : mm

Part Number M (Coarse)
Nominal of Thread
Pitch D1 L1 L2 d L3 e Key Part No. Hexalobular Socket No. t Qty per Pack Mass
SLEC-M3-B M3 0.5 6.8 2.5 6 3.35 4 0.4 SKX-10 10 1 1 0.82 4.91 CAD Cart
SLEC-M4-B M4 0.7 7 3 7 4.5 5 0.4 SKX-15 15 1.2 1 1.9 5.34 CAD Cart
SLEC-M5-B M5 0.8 8.5 4 10 5.5 6 0.4 SKX-20 20 1.5 1 3.3 5.09 CAD Cart
SLEC-M6-B M6 1 10 4 12 6.5 8 0.5 SKX-25 25 2 1 6 5.20 CAD Cart
SLEC-M8-B M8 1.25 13 5 16 8.5 9 0.8 SKX-30 30 2.5 1 14.3 5.95 CAD Cart

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Main Body SCM435
Ferrosoferric Oxide
Strength Class 10.9


Fixing linear guideway rails / Fixing workpieces and jigs / Fine positional adjustment of heavy objects


  • When the screw is tightened, the workpiece is strongly clamped by the head, which is decentered from the shaft center of the screw. The wedge effect creates a large clamping force with low tightening torque.
  • The hexalobular*1 shape can withstand high tightening torque.
    ⇒Features of the Hexalobular Socket
  • Use a dedicated wrench SKX for mounting and removing.
  • Use the SKX-N hexalobular wrench for extremely limited access spaces for mounting and removing in tight spaces.
  • Suitable for fixing linear guideway rails. As the decentered head presses the linear guideway rail against the installation reference surface, precision can be easily achieved when mounting. Also, mounting accuracy is maintained by suppressing warping and misalignment caused by long-term use.
  • SLEC-B-EL is an electroless nickel plating type. For applications that require corrosion resistance.

*1: The hexalobular shape is prescribed by JIS B 1015: 2008(ISO 10664: 2005)"Hexalobular internal driving feature for bolts and screws".

  • Since the precision - processed guide receives the clamping load, durability during clamping is increased.

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

Usage Example

Fixing workpieces and jigs.

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

Mounting Method

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

Mounting Dimensions

Unit : mm

Part Number E M B H8 Adjustment Range
s max.
SLEC-M3-B 3.10~+0.3 M3 3.35 -0.1/0.7 3.3
SLEC-M4-B 3.150~+0.3 M4 4.5 -0.05/0.75 4.1
SLEC-M5-B 3.90~+0.3 M5 5.5 -0.05/0.75 5.3
SLEC-M6-B 4.650~+0.3 M6 6.5 -0.15/0.85 5.5
SLEC-M8-B 6.050~+0.5 M8 8.5 -0.35/1.25 7

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

Recommended size of linear guideway rail

Unit : mm

Nominal of Rail Rail Width
Applicable Clamping Screws with Eccentric Head
#9 9 SLEC-M3-B SLEC-M4-B
#12 12 SLEC-M3-B SLEC-M4-B
#15 15 SLEC-M3-B SLEC-M4-B
#20 20 SLEC-M4-B SLEC-M5-B
#25 23 SLEC-M5-B SLEC-M6-B
#30 28 SLEC-M6-B SLEC-M8-B
#35 34 SLEC-M8-B

If the eccentric clamping bolt may interfere with the carriage, etc., avoid interference by lowering its mounting surface.
When using in a linear guideway, press at the position of the linear guideway's bolts.

Related Products

SLEC-B-ELElectroless Nickel Plating
Clamping Screw with Eccentric Head, which does not have a guide section below the head is available.
SLEC-A Ferrosoferric Oxide Film

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

SKX Hexalobular Wrench

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

SKX-N Hexalobular Wrench for Extremely Limited Access Spaces

SLEC-BClamping Screws(Guide type/Ferrosoferric Oxide Film)

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