SPAX SCREWS FOR
TIMBER CONSTRUCTION
Greg Pankhurst BE(Civil) SPAX Technical Consultant
목재 건축용 SPAX 나사
기술 컨설턴트
2 3 4 5
SPAX Introduction
1
Advantages of SPAX Screws
How to Choose the Correct Screw
Which Screw for Which Application
SPAX Design Information
Altenloh, Brinck & Co. founded 1823
The Beginning
The oldest producing Screw Manufacturer
196 years
in Germany / Ennepetal
Products:
Production of up to 50 million SPAX per day in many different sizes and shapes
Turnover:
400 Million.
Employees:
1500
Awarded
World Market Leader
Certifications:
ISO 9001 Management system ISO 50001 Energy management
>made in
Today
Multi head
Ground serrations
4CUT T-STAR plus
From head right down to the point
Innovation
makes the differenceImproved T-STAR plus recess:
▪ No cam-out effect
▪ Guide pin for enhanced bit seating
▪ Cost saving through longer bit service life
Multi-head:
▪ The screw head countersinks more easily and cleanly in all timbers
▪ The ribs act as a brake when fastening through steel by
The head
▪ 4CUT from 160 mm screw length and over
▪ Significantly reduces the driving torque
4CUT
▪ Ground serrations reaching down to the point
▪ Fast, reliable fastening with no pre- drilling (wood-dependent)
Ground serrations
▪ The thread geometry creates a more stable counter thread in the material
▪ The larger thread pitch lends the SPAX a greater amount of feed on each turn and speeds up fastening.
Coarse thread
4CUT
CUT point
The point
▪ The 4CUT has a square core with 4 cutting edges. The wood fibres are displaced and therefore splitting of the material is effectively reduced even in the case of short edge distances.
▪ The CUT point is distinguished by its arrow shape and can be placed precisely.
▪ The special screw geometry effectively reduces splitting of the wood or the timber product (e.g. MDF).
▪ Effectively reduced splitting by
displacement of the fibre with the 4CUT
▪ Also applies in the case of small edge distances
Distance from edge; 20 mm Distance from edge; 20 mm
▪ Significant splitting
Conventional timber screw
Driving trial in hardwood
Corrosion protection
▪ Corrosion protection twice as effective as conventional hot- dipped galvanised products
▪ Ideal for use in treated timbers
▪ High grade stainless steel for use in areas of higher corrosion such as coastal areas.
Load comparison
How to Choose the Correct Screw
올바른 나사를 선택하는 방법
▪ Grain orientation - Side grain
- End grain (not recommended)
▪ Timber species and density
▪ Edge/end distance & spacing
▪ Connection type
- determines style of head and thread type
▪ Corrosion resistance
▪ Aesthetics
▪ Fire resistance
-Screws inside timber are protected by the timber around the screws and will remain
„cool“ as long as timber protects the steel from the fire.
▪ Ease of installation
Factors for screw selection
Choose head shape
Countersunk head
Pan head Raised
countersunk head
Washer head
Cylindrical head
▪ Flush fixing
▪ For
fastening steel or timber
▪ Decorative fixing
▪ Easy to countersink
▪ Rests flat
▪ For
fastening thin steel fittings with through
▪ Strong clamping force
▪ High pull- through values
▪ For
recessing head below timber surface
▪ Minimum splitting
Choose thread type
Full thread Partial thread
Full thread
- for long screws no clamping effect
- with remarkably high load bearing capacity in tension as well as in compression
- inclined screws can work as framed truss - ideal for re-inforcement
- screws up to 600mm long
Partial thread
- with clamping effect, pull together
- clamping effect is dependant on head shape and size
- screws up to 600mm long
Which Screw for Which Application?
어떤 용도로 어떤 나사를 사용합니까?
Post and beam
Combining use of partial thread and full thread
Post and beam
Post and beam
Post and beam
Joist and beam
Full thread cylindrical head
Joist and beam
CLT connections
Partial thread countersunk head
Half-lap joints Floor to wall
CLT connections
Wall to floor
Full thread cylindrical or countersunk head
Reinforcement of notched beams
Reinforcement of notched beams
Weak point of timber
HOW TO FIX – screw as close as possible to the notching with full thread screw
Reinforcement of notched beams
Reinforcement of notched beams
Reinforcement of penetrations
Comparison:
compression perpendicular to grain
without re-inforcement damage at 60 kN loading
with re-inforcement
no damage at 100 kN loading
Reinforcement of penetrations
Full thread countersunk head
Decking Boardwalk
▪ The SPAX for boardwalks, paths and footbridges.
▪ The SPAX for wooden decks
Special applications
Timber to steel
▪ For wooden decks on steel joist
▪ Flooring screw, indoor use only
▪ The reliable fastener for MDF boards
Bold
▪ For wooden decks with visible connection.
Special applications
▪ For solid timber floors ▪ For no-plug fastening of window and door frames
Special applications
Advantages of Pre-drilling
It is not necessary to pre-drill when using SPAX screws into softwood but there are advantages:
▪Increased load capacity, particularly in shear
▪Reduced spacing, edge distance and timber thickness
▪Quicker to install
▪Less on-site labour reduces cost (pre-drilling as a locating guide for easy installation)
▪Quality control
▪Greater battery life
To pre-drill or not to pre-drill?
Available for download at www.spaxpacific.com Design according to
Eurocode and SPAX ETA
SPAX design information
Available for download at https://downloads.spax.com
SPAX design information
For more information, please visit us on www.spaxpacific.com
