HDC-C Timber Construction Screw Countersunk Head

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HDC-C Timber Construction Screw Countersunk Head

The Allfasteners HDC-C countersunk timber construction screw is a premium zinc-plated fastener engineered for structural timber applications. Designed for strong load-bearing connections, this screw delivers exceptional performance in general timber framing, subcontract build-ups, and construction projects.

Key Features

Corrosion Protection: Zinc plating provides reliable basic corrosion resistance for interior or lightly exposed timber structures.
Countersunk Head: The flush countersunk head ensures a clean finish, allowing the screw to sit flush or be concealed under filler or timber plugs.
High Strength: Engineered to deliver strong shear and withdrawal resistance, making it ideal for structural timber joints.
Precision Threading: Fine thread with full engagement in timber, helping reduce splitting and maximizing grip.
Compatibility: Suitable for use in a wide range of timber types, including softwoods and hardwoods including CLT, KVH, BSH / GLT, LVL

SKU 1212.0

Availability:

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Grouped product items
Product Name	Qty
M5 x 40mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $59.00
M5 x 50mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $44.10
M5 x 60mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $34.50
M5 x 70mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $39.00
M5 x 80mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $44.40
M5 x 90mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $48.30
M5 x 100mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $53.50
M5 x 120mm HDC-C Timber Construction Screw Csk Rib Torx T25 Hd Z/P From $60.30
M6 x 50mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $40.80
M6 x 60mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $23.25
M6 x 70mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $26.30
M6 x 80mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $28.80
M6 x 90mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $31.50
M6 x 100mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $36.70
M6 x 120mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $46.00
M6 x 140mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $52.40
M6 x 160mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $61.85
M6 x 180mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $69.25
M6 x 200mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $77.10
M6 x 220mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $86.30
M6 x 240mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $96.60
M6 x 260mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $108.15
M6 x 280mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $121.20
M6 x 300mm HDC-C Timber Construction Screw Csk Rib Torx T30 Hd Z/P From $135.80
M8 x 80mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $25.10
M8 x 100mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $28.68
M8 x 120mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $36.23
M8 x 140mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $37.70
M8 x 160mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $46.55
M8 x 180mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $69.78
M8 x 200mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $81.80
M8 x 220mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $94.08
M8 x 240mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $90.03
M8 x 260mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $99.50
M8 x 280mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $110.80
M8 x 300mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $118.35
M8 x 320mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $132.50
M8 x 340mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $142.53
M8 x 360mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $160.48
M8 x 380mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $180.60
M8 x 400mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $207.70
M8 x 440mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $233.53
M8 x 480mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $261.70
M8 x 520mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $287.53
M8 x 560mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $313.33
M8 x 600mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $168.43
M10 x 120mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $48.88
M10 x 140mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $62.13
M10 x 160mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $33.78
M10 x 180mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $42.14
M10 x 200mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $59.31
M10 x 220mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $68.21
M10 x 240mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $65.23
M10 x 260mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $72.14
M10 x 280mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $83.44
M10 x 300mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $87.86
M10 x 320mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $94.50
M10 x 340mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $105.81
M10 x 360mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $118.53
M10 x 380mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $132.75
M10 x 400mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $148.66
M10 x 440mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $159.90
M10 x 480mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $171.15
M10 x 520mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $182.39
M10 x 560mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $193.63
M10 x 600mm HDC-C Timber Construction Screw Csk Rib Torx T40 Hd Z/P From $204.86

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Description

Applications

This screw is ideally used for: Framing and load-bearing timber structures Roof trusses, wall studs, and floor joists Timber frame construction requiring strong, reliable fasteners Substructure connections where shear strength and structural integrity are required

Design & Compliance

Allfasteners HDC-C screws are manufactured to rigorous quality standards to ensure consistent strength and durability. While zinc-plated for general use, they are best suited for non-industrial environments. For highly corrosive or exposed exterior applications, consider the Class 4 galvanised version for superior corrosion resistance.

Installation Tips

Use a torque-controlled driver to prevent overdriving into hardwoods.
Pre-drill in very dense or brittle timber to avoid splitting.
Ensure the head is seated flush for best appearance and performance.

Zinc vs Class 4 Galvanised

The zinc-plated HDC-C screw offers solid protection for internal or lightly exposed timber structures. For harsher environments — such as coastal areas, treated timber, or outdoor use — the Class 4 galvanised version provides superior corrosion resistance and endurance.

Why Choose Allfasteners

At Allfasteners, we prioritise quality and compliance. Our HDC-C timber construction screws are made for performance, reliability, and long-term durability. With national stock in Australia, we ensure quick delivery so your project stays on track.

Product List

SKU	Description	Availability	List Price	Pack
				Pack:

More Information

More Information
Coating & Plating	Zinc Clear
Material Grade	Carbon Steel
Head Type	Countersunk
Driver Type	Torx Bit
Diameter / Gauge	M8, M10
Thread Type	Dual Thread
For use with	CLT (Cross Laminted Timber), LVL (Layerd Veneer Lumber), Timber, GLT (Glulam)

Technical Information

SKU	Description	Coating	Thread Length	Max. Fixture Length	Driver Bit
1212.0050040	M5 x 40mm HDC-C	Zinc White	22mm	18mm	TX25
1212.0050050	M5 x 50mm HDC-C	Zinc White	30mm	20mm	TX25
1212.0050060	M5 x 60mm HDC-C	Zinc White	40mm	20mm	TX25
1212.0050070	M5 x 70mm HDC-C	Zinc White	40mm	30mm	TX25
1212.0050080	M5 x 80mm HDC-C	Zinc White	50mm	30mm	TX25
1212.0050090	M5 x 90mm HDC-C	Zinc White	50mm	40mm	TX25
1212.0050100	M5 x 100mm HDC-C	Zinc White	60mm	40mm	TX25
1212.0050120	M5 x 120mm HDC-C	Zinc White	60mm	60mm	TX25
1212.0060050	M6 x 50mm HDC-C	Zinc White	30mm	20mm	TX30
1212.0060060	M6 x 60mm HDC-C	Zinc White	30mm	30mm	TX30
1212.0060070	M6 x 70mm HDC-C	Zinc White	40mm	30mm	TX30
1212.0060080	M6 x 80mm HDC-C	Zinc White	50mm	30mm	TX30
1212.0060090	M6 x 90mm HDC-C	Zinc White	50mm	40mm	TX30
1212.0060100	M6 x 100mm HDC-C	Zinc White	60mm	40mm	TX30
1212.0060120	M6 x 120mm HDC-C	Zinc White	75mm	45mm	TX30
1212.0060140	M6 x 140mm HDC-C	Zinc White	75mm	65mm	TX30
1212.0060160	M6 x 160mm HDC-C	Zinc White	75mm	85mm	TX30
1212.0060180	M6 x 180mm HDC-C	Zinc White	75mm	105mm	TX30
1212.0060200	M6 x 200mm HDC-C	Zinc White	75mm	125mm	TX30
1212.0060220	M6 x 220mm HDC-C	Zinc White	75mm	145mm	TX30
1212.0060240	M6 x 240mm HDC-C	Zinc White	75mm	165mm	TX30
1212.0060260	M6 x 260mm HDC-C	Zinc White	75mm	185mm	TX30
1212.0060280	M6 x 280mm HDC-C	Zinc White	75mm	205mm	TX30
1212.0060300	M6 x 300mm HDC-C	Zinc White	75mm	225mm	TX30
1212.0080080	M8 x 80mm HDC-C	Zinc White	50mm	30mm	TX40
1212.0080100	M8 x 100mm HDC-C	Zinc White	50mm	50mm	TX40
1212.0080120	M8 x 120mm HDC-C	Zinc White	80mm	40mm	TX40
1212.0080140	M8 x 140mm HDC-C	Zinc White	100mm	40mm	TX40
1212.0080160	M8 x 160mm HDC-C	Zinc White	100mm	60mm	TX40
1212.0080180	M8 x 180mm HDC-C	Zinc White	100mm	80mm	TX40
1212.0080200	M8 x 200mm HDC-C	Zinc White	100mm	100mm	TX40
1212.0080220	M8 x 220mm HDC-C	Zinc White	100mm	120mm	TX40
1212.0080240	M8 x 240mm HDC-C	Zinc White	100mm	140mm	TX40
1212.0080260	M8 x 260mm HDC-C	Zinc White	100mm	160mm	TX40
1212.0080280	M8 x 280mm HDC-C	Zinc White	100mm	180mm	TX40
1212.0080300	M8 x 300mm HDC-C	Zinc White	100mm	200mm	TX40
1212.0080320	M8 x 320mm HDC-C	Zinc White	100mm	220mm	TX40
1212.0080340	M8 x 340mm HDC-C	Zinc White	100mm	240mm	TX40
1212.0080360	M8 x 360mm HDC-C	Zinc White	100mm	260mm	TX40
1212.0080380	M8 x 380mm HDC-C	Zinc White	100mm	280mm	TX40
1212.0080400	M8 x 400mm HDC-C	Zinc White	100mm	300mm	TX40
1212.0080440	M8 x 440mm HDC-C	Zinc White	100mm	340mm	TX40
1212.0080480	M8 x 480mm HDC-C	Zinc White	100mm	380mm	TX40
1212.0080520	M8 x 520mm HDC-C	Zinc White	100mm	420mm	TX40
1212.0080560	M8 x 560mm HDC-C	Zinc White	100mm	460mm	TX40
1212.0080600	M8 x 600mm HDC-C	Zinc White	100mm	500mm	TX40
1212.0100120	M10 x 120mm HDC-C	Zinc White	80mm	40mm	TX40
1212.0100140	M10 x 140mm HDC-C	Zinc White	80mm	60mm	TX40
1212.0100160	M10 x 160mm HDC-C	Zinc White	100mm	60mm	TX40
1212.0100180	M10 x 180mm HDC-C	Zinc White	100mm	80mm	TX40
1212.0100200	M10 x 200mm HDC-C	Zinc White	100mm	100mm	TX40
1212.0100220	M10 x 220mm HDC-C	Zinc White	100mm	120mm	TX40
1212.0100240	M10 x 240mm HDC-C	Zinc White	100mm	140mm	TX40
1212.0100260	M10 x 260mm HDC-C	Zinc White	100mm	160mm	TX40
1212.0100280	M10 x 280mm HDC-C	Zinc White	100mm	180mm	TX40
1212.0100300	M10 x 300mm HDC-C	Zinc White	100mm	200mm	TX40
1212.0100320	M10 x 320mm HDC-C	Zinc White	100mm	220mm	TX40
1212.0100340	M10 x 340mm HDC-C	Zinc White	100mm	240mm	TX40
1212.0100360	M10 x 360mm HDC-C	Zinc White	100mm	260mm	TX40
1212.0100380	M10 x 380mm HDC-C	Zinc White	100mm	280mm	TX40
1212.0100400	M10 x 400mm HDC-C	Zinc White	100mm	300mm	TX40
1212.0100440	M10 x 440mm HDC-C	Zinc White	100mm	340mm	TX40
1212.0100480	M10 x 480mm HDC-C	Zinc White	100mm	380mm	TX40
1212.0100520	M10 x 520mm HDC-C	Zinc White	100mm	420mm	TX40
1212.0100560	M10 x 560mm HDC-C	Zinc White	100mm	460mm	TX40
1212.0100600	M10 x 600mm HDC-C	Zinc White	100mm	500mm	TX40