Schletter Screw 8 x 100 VA Flat Head TORX Wood Screw, Stainless Steel | 943208-100

Description

This Schletter 8 x 100mm wood screw secures roof hooks and mounting components directly into timber substructure, using a wafer (flat plate) head that sits flush with the surface for a neat, load-spreading fixing.

Manufactured in VA (stainless) steel with a Torx (TX) drive, it offers strong corrosion resistance for outdoor use, along with reliable torque transfer during installation that resists cam-out under load.

8 x 100mm

Screw Size

TX40

Torx Drive Size

96mm

Thread Length

VA Stainless

Material

Wafer Head

Head Type

Full Thread

Thread Coverage

Key Features

Wafer Head for Load Spreading

The wide, flat wafer head distributes clamping load over a larger surface area than a standard screw head, reducing point-loading on the fixed component.

TX40 Torx Drive

A Torx (TX40) drive gives strong torque transfer with reduced cam-out risk compared to a Phillips or slotted head, useful when driving into denser timber.

Near Full-Length Thread

With a 96mm thread length out of 100mm overall, the screw achieves strong purchase into the timber substrate along almost its entire length.

VA Stainless Steel Construction

Manufactured in VA (stainless) steel, giving good long-term corrosion resistance for roof-mounted fixings exposed to UK weather.

Minimum Embedment Guidance

Schletter's own guidance recommends a minimum embedment of 80mm into unclad roofs, or 120mm where formwork and counter battens are present — confirm penetration depth against your roof build-up.

Compatible With Roof Hook Fixing

Suited to fixing roof hooks and similar mounting hardware directly into wood purlins, rafters or battens as part of a wider Schletter mounting system.

Technical Specification

Screw Specification

Thread Diameter

8 mm

Overall Length

100 mm

Thread Length

96 mm

Thread Distribution

Full thread

Head Shape

Flat / wafer head

Drive Type

Hexalobular (Torx), bit size TX40

Shaft Diameter

6 mm

Tip Shape

Pointed

Materials

Material

VA (stainless) steel

Installation Guidance

Minimum Embedment, Unclad Roofs

80 mm

Minimum Embedment, With Formwork & Counter Battens

120 mm

Frequently Asked Questions

What is a wafer head screw used for?

The wide, flat wafer head spreads clamping load over a larger area than a standard round or countersunk head, which is useful when fixing roof hooks or brackets where load distribution into the timber matters.

What drive bit do I need for this screw?

It uses a TX40 Torx drive, which offers strong torque transfer and good resistance to cam-out compared with a standard Phillips or slotted screwdriver.

How deep should this screw penetrate the timber?

Schletter's guidance recommends a minimum embedment of 80mm on unclad roofs, increasing to 120mm where the roof has formwork and counter battens — check against your specific roof build-up before fixing.

Is this screw suitable for outdoor use?

Yes, it is manufactured in VA stainless steel, giving good resistance to weathering and corrosion for long-term outdoor roof fixings.

What is the difference between this and the 8x80mm galvanised screw?

This 8x100mm screw is stainless steel with a wafer head suited to deeper embedment, while the 8x80mm option is a galvanised steel screw for shorter fixing depths. Choose based on your required embedment depth and preferred corrosion protection.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

Calculate

Required Heating

0

Watts

0

BTUs