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Application and Specification Guide

THREADING

Mechanical Strenght Properties

Primus fastener mechanical strength properties table by screw gauge
Screw Gauge Torsional Axial Single Strength Tensile Shear Max Min Max Min ( Nm) (Kn) (Kn) #10G-16TPI 4.80 4.65 3.58 3.43 1.59 6.9 Nm Min 11.9 6.8 #10G-24TPI 4.83 4.66 - - 1.06 7.3 Nm Min 11.4 6.2 #12G-14TPI 5.46 5.31 4.17 3.99 1.80 10.9 Nm Min 15.3 8.8 #12G-24TPI 5.49 5.32 - - 1.06 11.3 Nm Min 16.7 9 TPI 12° Min ( ≧ 20mm) 12° Min ( ≧ 25mm) Major Diameter Minor Diameter Pitch(nom.) (p) Bend Test

Note: All Figures are ultimate averages obtained under laboratory conditions. 

Appropriate safety factors should be applied for design purposes. These figures apply to Primus Fasteners (PC Head Marked) Products only. 

PULLOVER

  1. The principal objective in the use of a pull-out tester system is to validate the withdrawal resistance of fixings on the substrate.

  2. A tensile load is applied to the fixing mechanically using the hand crank of the pull-out tester. The gauge displays and registers the peak pull-out force.

Note: All Figures are ultimate averages obtained under laboratory conditions. 

Appropriate safety factors should be applied for design purposes. These figures apply to Primus Fasteners (PC Head Marked) Products only. 

Primus fastener pull-out test withdrawal resistance chart

HEADING POINT

Primus Fasteners 

Superiority in Product Design, Application, Installation, and Innovation

Primus fastener heading point design diagram

UNDERCUT

PriLess undercut fastener head design diagram

Advantages of PriLess™ Undercut

  • Great for steel framing when multiple thicknesses are used. 

  • PriLess™ undercut head is designed to eliminate the stress that concentrates under the head of Fastener.

  • PriLess™ Special undercut entraps sealant… even when driven at angles.

INSTALLATION GUIDANCE

Speed/Torque to be set

  • An Electric Standard Screw gun with a depth-sensitive nosepiece should be Used to install Primus Fasteners.

  • The speed to be set is 2,000 rpm.

  • Torque clutch to be set at 2 or 3.

  • Driving torque at 18 – 24 Nm (180 – 240 kg/cm).

  • Primus Fasteners to be used with Primus Hi-Torque Magnetic.

  • The fastener is fully seated when the head is flush with the work surface.

  • Overdriving may result in torsional failure of the fastener or strip out of the substrate.

  • The fastener must penetrate beyond the metal structure a minimum of 3 pitches of thread.

Key Points to be noted before Installation

Don’t Use

  • Use of Impact Guns or Hammer Drills is not recommended

Tools not recommended for installing Primus self-drilling fasteners
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