You will need an M12x60mm nylon plug with an M8 x25mm washer for masonry work

I want to screw these M8 120mm screws into a 4” stair rail without it splitting. Should I drill a pilot hole?

I would drill a pilot hole if I were doing what you're doing, because they are not really designed for super accurate work, more for rough fixings. They are excellent though for securely fixing rough timber.

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TIMCO Advanced Coach Screw | Hex Flange Head | Slash Point | Yellow | 8.0 x 120 | Box of 50 (8120SCSY)

TIMCO Advanced Coach Screw | Hex Flange Head | Slash Point | Yellow | 8.0 x 120 | Box of 50 (8120SCSY)

Product ID: 197218787

Details

Exterior finish
Zinc
Head style
Hex
Item dimensions L x W x H
12 x 0.8 x 0.8
Material
Carbon Steel
Thread size
M8 x 120

🔩8mm heavy-duty diameter

⚙️Hex flange head for max torque

🛠️Slash point tip for easy driving

NT$2041

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Description

🔧 Screw it right, screw it tight — the pro’s choice for lasting strength!

EFFORTLESS INSTALLATION - Aggressive slash point tip reduces splitting and drives smoothly with power tools.
PRO GRADE COMPATIBILITY - Includes 10mm socket driver, optimized for impact drivers to save time and effort.
UNMATCHED CLAMPING POWER - Partially threaded shank delivers superior grip and stability for your toughest projects.
VERSATILE HEAVY DUTY USE - Perfect for timber framing, decking, fencing, pergolas, and more—your all-in-one fastening solution.
CORROSION RESISTANT FINISH - Zinc plated and yellow passivated coating ensures long-lasting durability outdoors.

The TIMCO Advanced Coach Screw (8.0 x 120mm) is a premium heavy-duty fastener designed for professional-grade timber and outdoor projects. Featuring a hex flange head for maximum torque, an aggressive slash point tip for easy driving, and a corrosion-resistant zinc yellow finish, this set of 50 screws offers exceptional clamping strength and durability. Compatible with power tools and including a socket driver, it’s the modern upgrade to traditional coach screws, trusted by builders and DIY pros alike.

Specifications

ASIN	B07YPRGT1Q
Best Sellers Rank	50,993 in DIY & Tools ( See Top 100 in DIY & Tools ) 737 in Screws (DIY & Tools)
Brand Name	TIMCO
Colour	Yellow
Compatible Groove Diameter	7 Millimeters
Country Of Origin	United Kingdom
Customer Reviews	4.7 4.7 out of 5 stars (502)
Drive System	External Hex
Exterior Finish	Zinc
Fastener Size	8.0 x 120
Fastener Type	Hex Head Screw
Finish Types	Zinc Plated
Grade Rating	Grade 8
Head Type	Hex
Included Components	Socket driver included
Item Diameter	8 Millimetres
Item Dimensions	12 x 0.8 x 0.8 centimetres
Item Type Name	Hex Flange Head, Slash Point
Item Weight	1.48 Kilograms
Manufacturer	TIMCO
Manufacturer Part Number	8120SCSY
Material Type	Carbon Steel
Metal	Carbon Steel
Model Number	8120SCSY
Number Of Items	50
Number of Packs	1
Number of Pieces	50
Outside Diameter	8 Millimetres
Screw Head Style	Hex
Screw Point Style	oblique point
Set Name	Set of 50 - M8 X 120mm TIMCO Solo Coach Screws
Set Screw Thread Type	metric
Size	8.0 x 120
Thread Class	3B
Thread Coverage	Partially Threaded
Thread Size	M8 x 120
Thread Style	Right Hand
Thread Type	Metric
Unit Count	50.0 count

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NT$2041

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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