Wooden round stair to present timber to timber load bearing connections in interior environment

Pay Attention To

Environment! INTERIOR or EXTERIOR?

Timber should be PRE-DRILLED when density of the timber is greater than 500 kg/m3 and/or diameter (side dimension) of the screw exeeds 6 mm.

There should be at least TWO SCREWS in a connection.

Screw pointside PENETRATION LENGTH should be at least 6x DIAMETER.

Load-bearing screws should meet the requirements of the CERTIFICATES or STANDARDS.

The wrong SIZES and LOCATIONS of the load-bearing screws could crush the wood and reduce the load capacity.

Is the screw COLOR important?

Important load-bearing connections with heavy loads should be calculated by CONSTRUCTION ENGINEER

Suitable Fasteners

ScrewTIMco Coach Screw

ForgeFast Elite Low-Torque Woodscrew
TIMco Classic Multi-Purpose Screw Yellow
TIMco Carriage Bolt

TIMco Threaded Bar Zinc

For MaterialsHardwood, Softwood, Brick (with plug)*Multi-purpose

- hardwood
- softwood
- chipboard
- MDF
- thin metal
- plastic
Multi-purpose

- hardwood
- softwood
- chipboard
- MDF
- thin metal
- plastic
Wood
EnvironmentInterior (1)*

- clean, dry and low humidity environments
Interior and Soft ExteriorInterior and Soft Exterior (2)*

- occasionally damp/wet, rural and sheltered areas
Interior (1)*

- clean, dry and low humidity environments
Interior (1)*

- clean, dry and low humidity environments
Salt Spray Resistance400 hrs
Drive TypeHexagon Head

- receives a high torque.
- firm drive
- extended bit life
Torx Drive

- receives a high torque.
- good resistance to cam out
- firm drive
- extended bit life
Pozidriv Drive

- receives a medium torque
- tool can cam out at high torque
- easy to strip the heads
Domed-
HeadRibs Under Head*

- improved countersinking
Double Countersunk*

- reduces the likelihood of head shear and assists completion of countersinking
Domed Top With Square Under the Head

- grips into the part being fixed, preventing the bolt from turning
-
TorqueHigh TorqueHigh TorqueMedium Torque--
ThreadSingle ThreadPatented Self-drilling Thread*

- removes the need to pre-drill composite boards
- no pilot hole needed
Single Thread
Fully Threaded Up To 70 mm
Molecular Lubrication*

- Patented lubrication, designed
to enhance screw insertion time
and provides greater resistance
to corrosion.
Metric Coarse Thread

- Fully threaded up-to and including 150mm. Partially threaded thereafter
Fully Threaded Metric Coarse Thread
Reverse Thread-----
PointSharp Point*

- for faster bite
- capable of penetrating 0.8mm steel
Type 17 point*

- reduces torque and the likelihood of the timber splitting when the screw is inserted close to the edge
- doesn't require a pilot hole into most wood types

NB!

Some sellers have info that point is A 25 but according to TIMco info, new screws are with Type 17 points.
Shreaded End

- used with nuts
Shreaded End

- used with nuts
- used with chemical resin
CE or StandardCE approved

- for use in load-bearing timber construction
CE approved

- for use in load-bearing timber construction
CE approved

- for use in load-bearing timber construction
CE approved

- for use in load-bearing timber construction
CE approved

- for use in load-bearing timber construction
FinishZincYellow ZincYellow ZincZincZinc
Advantages:
A Traditional Heavy Duty Woodscrew
Hexagon Head

- receives a high torque.
- firm drive
- extended bit life
Torx Drive

- receives a high torque.
- good resistance to cam out
- firm drive
- extended bit life

Ribs Under Head*

- improved countersinking

Sharp Point*

- for faster bite
- capable of penetrating 0.8mm steel

Patented Self-drilling Thread*

- removes the need to pre-drill composite boards
- no pilot hole needed
Type 17 point

- reduces torque and the likelihood of the timber splitting when the screw is inserted close to the edge
- doesn't require a pilot hole into most wood types

Molecular Lubrication*

- Patented lubrication, designed
to enhance screw insertion time
and provides greater resistance
to corrosion.
Domed Top With Square Under the Head

- more decorative finish
- grips into the part being fixed, preventing the bolt from turning
Can Be Used With Very Thick Materials
Disadvantages:
Needs Pre-drilled HolesPozidriv Drive

- receives a medium torque
- tool can cam out at high torque
- easy to strip the heads
Can't Be Installed From Only One Side
Needs Pre-drilled Holes
Needs Nuts
Needs Nuts
Needs Pre-drilled Holes
MORE INFO!MORE INFO!MORE INFO!MORE INFO!MORE INFO!

How to Calculate Screws

Coming soon…