Product Technical Guides : US-EN Direct Fastening - Volume 1 Edition 22 | Page 214

3.6.1.7 HILTI SCREW FASTENER INSTALLATION INSTRUCTIONS *

It is essential that proper rpm , setting depth and torque be utilized when installing Hilti screws .

Install self-drilling screws perpendicular to the work surface . The self-drilling feature of the screw will drill a hole completely through the base material before tapping the threads . Do not apply excessive pressure . Too much pressure will slow the speed of the screwdriver , increasing the installation time and possibly leading to drill tip failure . The variable speed motors of Hilti screwdrivers help enable the operator to start the screw in a precise position and drive it at the speed best suited for the application . The tables below provide additional suggested tools as well as common socket and bit sizes . fastening self-drilling screws in steel up to 1 / 4 " ( 6 mm ) thick . There is a depth gauge on the front of the tool for correct depth setting of screws .

The Hilti ST 1800 heavy duty torque adjustable screwdriver features a 1,800 rpm for fastening self-drilling screws in steel up 1 / 2 " ( 12 mm ) thick . There is a depth gauge on the front of the tool for correct depth setting of screws . There is also an 18 position adjustable torque clutch for correct torque release setting of screws . By avoiding overdriving , proper torque adjustment will deliver more consistent fastening quality .

The ST 1800 may also be operated with the SDT 9 for a stand-up decking system to fasten steel deck .

Please reference the table on torque considerations below for more information on proper installation of Hilti screw fasteners .

* These are abbreviated instructions which may vary by application . ALWAYS review / follow the instructions accompanying the product .

# 10 5 / 16 " 2 # 12 5 / 16 " 3 1 / 4 " 3 / 8 " 3

Torque Considerations for Screw Fastening Applications 3

Soft joint applications Hard joint applications

Applications

Considerations 1 , 2

These include , but are not limited to , typical applications involving interior drywall fastening , exterior sheathing , metal framing , HVAC duct and plywood to metal .

Ideally , these applications should be carried out with a corded or cordless screwdriver that features either an adjustable torque clutch or a properly adjusted depth gauge . However , a tool without these features can often be used in soft joint applications .

This is because the applications are considered non-structural and / or possess sufficient redundancy in fastening points that any impact of over-driving may be sufficiently mitigated .

These include , but are not limited to , typical applications involving metal decking ( both frame and sidelap ), metal siding ( both frame and sidelap ), exterior façade and window glazing as well as any application where stripping of the base material may occur .

Any application involving sealing washers requires a depth gauge or torque clutch to help ensure that an optimal seal is achieved .

These applications must utilize a corded or cordless screwdriver that features either an adjustable torque clutch , speed settings that have been verified for use in the specific application or a properly adjusted depth gauge in order to help ensure consistent fastening and achieve published connection capacities .

This is because the applications are considered structural elements of the design . Over-driving may cause connection failures or fastener failures that possibly compromise the integrity of the connection .

1 Whether an application requires a depth gauge or torque clutch is the judgment of the person responsible for the project . If conditions are unknown or in doubt , use a screwdriver that features either an adjustable torque clutch or a properly adjusted depth gauge .

2 All screw fastening connection capacities published in this manual were developed using corded or cordless screwdriver tools with adjustable torque clutches . Over-driving a screw fastener can cause a connection failure in lighter gauge and lower strength steel base materials ( the threads tapping the base material are stripped by excessive torque ) or a fastener failure in heavier gauge and higher strength steel base materials ( the screw is damaged or sheared by excessive torque ). This type of damage is not always visually detectable . Regardless of the tool or its torque setting , test fastenings should always be performed to verify the appropriate torque is being applied . 3 For additional information , contact Hilti Technical Services at 877-749-6337 .

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