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Rolok® HS®

ROLOK® HS®
Optimized Thread Forming Fastener for High-Strength Steels

Fastener for High Strength Steel, Rolok® HS®

Benefits

Ability to form threads in high-strength steels

High stripping torque typical of round body fasteners

Low thread forming torque due to proprietary Rolok® feature

Reduced required end load for improved assembly ergonomics

Increased torsional strength for thread forming in thick steel materials

Features

Large upper flank angle changes thread loading from shear to compression eliminating thread collapse

Proprietary torque reducing Rolok® feature innovatively adapted for high-strength steels

Formed threads will accept standard machine screws

Round body allows for thread rolling into asymmetrical holes

Available in short point configurations


Rolok® HS® Video Presentation

Rolok® HS® for High Strength DP1180 Steel with Laser Cut Holes Video


Rolok spiral 

 

 

 

  1. Rolok® spiral lobed feature reduces drive torque

     
  2. Taper design provides self-alignment during installation

Features & Benefits

Semblex’s innovative Rolok HS® design has been specifically developed for the joining of high-strength steels. Its unique compound thread angle provides exceptional assembly performance while overcoming thread damage and collapse that plague traditional thread rolling screws.

  1. Upper FlankA large upper flank angle increases compressive strength and reduces shear loading, preventing thread collapse.
     
  2. Narrow lower flank angle allows serviceability with standard machine screws
  • Ability to roll form threads into high-strength steels between 500-1200 MPa tensile strength
  • Excellent drive-to-fail ratio
  • High resistance to vibration loosening
  • Serviceable with standard machine screws

Product Characteristics 

Pitch Lead

Rolok HS® hole sizing is application-dependent; please contact Semblex Engineering Services for details.

Screw Length (L)

Tolerance

Up to 20mm

+0.0/-0.8 mm

Over 20mm to 40mm

+0.0/-1.3 mm

Over 40mm

+0.0/-1.5 mm

Screw
Size

Circumscribing  Diameter (C)

Max

Min

M4-0.7

4.09

3.93

M5-0.8

5.09

4.94

M6-1.0

6.10

5.95

M8-1.25

8.13

7.98

M10-1.5

10.15

9.98

 

HEAT TREATMENT

HEAT TREATMENT Case hardening is considered for non-safety critical applications when the mating material is 800 MPa tensile strength or less. All other applications should utilize hardening with induction-hardened lead threads.

FINISH

Various coating and plating options are available to meet specific customer requirements for corrosion and joint performance.

 

Performance Data 

Performance Data     Drive Torque Legend

Testing Details

Fasteners:

Heat Treat:

Hole Diameter:

Speed:

Number of Tests:

 

M5-0.8 X 12mm

Induction Hardened

4.60, 4.65, 4.70mm

225 RPM

90 Per Fastener
30 Per Hole Dia.

 

QP1200 Steel

 

Performance Data     Drive Torque Legend

Testing Details

Fasteners:


Heat Treat:

Hole Diameter:



Speed:

Number of Tests:

 

M8-1.25 X 30mm
M6-1.0 X 20mm

Induction Hardened

RHS M8:   7.40, 7.60mm
RHS M6:   5.55, 5.69mm 
Comp M8: 7.30, 7.50mm

150 RPM

60 Per Fastener
30 Per Hole Dia.

 

mp800 Steel

Performance Data     Drive Torque Legend

Testing Details

Fasteners:


Heat Treat:

Hole Diameter:



Speed:

Number of Tests:

 

M8-1.25 X 30mm
M5-0.8 X 12mm

Induction Hardened

RHS M8:   7.40, 7.60mm
RHS M5:   4.53, 4.67mm 
Comp M8: 7.30, 7.50mm

225 RPM

60 Per Fastener
30 Per Hole Dia.

 

Drive-to-Failure Testing in 1.5mm 980XG3 Steel

Performance Data     Drive Torque Legend

Image of worn punch and resultant holes used for testing.

Testing Details

Fasteners:

Heat Treat:

Hole Diameter:

Speed:

Number of Tests:

 

M5-0.8 X 12mm

Case Hardened

4.53, 4.60, 4.67mm

225 RPM

90 Per Fastener
30 Per Hole Dia.

 

Drive-to-Failure Testing in 3mm HSLA550


    Data Sheet(s)    

Rolok® HS® Brochure