Which screw is harder, M3.5 or M4?M5?

They're both hard, but the M4 and M5 model is harder.

How do I determine if I need to pre-drill holes in my wood?

When your wood is very hard, please pre-drill holes in the boards to prevent them from cracking.

Is this a brass screw?

No,They're made of carbon steel. and yellow zinc plated screws, which are harder than brass screws. But brass screws are more beautiful. Their ability to resist rust is the same.

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3.5x16mm Screws for Wood,Flat Head Wood Screws,Fine Thread and Yellow Zinc Galvanized (100pcs)

Product ID: 337089888

Details

Material
Steel， Zinc
Head style
Cross Flat
Item dimensions L x W x H
16 x 3 x 16
Exterior finish
Zinc
Thread size
M3.5 x 16mm

⚡Heat-treated high tensile strength

🛠️3.5x16mm precision size

🛡️72h salt spray corrosion resistance

10784CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Screw it right, screw it tight — the pro’s choice for flawless builds!

POWER READY - High-strength Phillips PH2 head perfectly matches manual and electric screwdrivers for effortless installation.
BUILT TO LAST - Yellow zinc coating guarantees rust-free durability even after 72 hours of salt spray testing.
PRECISION FIT - 3.5x16mm size with fully threaded fine threads for a secure grip in wood and multiple materials.
ENGINEERED TOUGHNESS - Heat-treated carbon steel alloy ensures maximum hardness and reduces head damage during heavy-duty use.
VERSATILE PERFORMANCE - Ideal for wood, plasterboard, chipboard, concrete, decks, and plastic—your all-in-one fastening solution.

These 3.5x16mm flat head wood screws feature a heavy-duty yellow zinc galvanized finish that resists rust and corrosion for over 72 hours in salt spray tests. Crafted from heat-treated carbon steel alloy, they deliver superior tensile strength and durability. Fully threaded with a high-strength Phillips PH2 head, they ensure a secure fit and compatibility with both manual and electric screwdrivers. Perfect for a wide range of materials including wood, plasterboard, concrete, and plastic, these 100-piece screws are engineered for professional-grade fastening and long-lasting performance.

Specifications

ASIN	B097BRZDVL
Best Sellers Rank	408 in DIY & Tools ( See Top 100 in DIY & Tools ) 2 in Screws (DIY & Tools)
Brand Name	TOPYWMSP
Colour	Yellow
Compatible Groove Diameter	3.5 Millimeters
Country Of Origin	China
Customer Reviews	4.3 out of 5 stars 96 Reviews
Drive System	Phillips
Exterior Finish	Zinc
Exterior finish	Zinc
Fastener Size	3.5x16mm
Fastener Type	Wood Screws
Finish Types	Zinc Plated
Head Type	PH2
Head style	Cross Flat Head
Item Diameter	3.5 Millimetres
Item Dimensions	16 x 3 x 16 millimetres
Item Weight	100 Grams
Item dimensions L x W x H	16 x 3 x 16 millimetres
Manufacturer	Zhengzhou HP Ltd
Manufacturer Part Number	ZZWLSA08078
Material	alloy_steel，Carbon Steel， Zinc Passivated
Material Type	alloy_steel，Carbon Steel， Zinc Passivated
Metal	Alloy_steel，Carbon Steel， Zinc Passivated
Number Of Items	100
Number of Pieces	100
Outside Diameter	3.5 Millimetres
Point style	Sharp
Screw Head Style	Cross Flat Head
Screw Point Style	Sharp
Set Screw Thread Type	UNF
Size	3.5x16mm
Thread Class	fine
Thread Coverage	Fully Threaded
Thread Size	M3.5 x 16mm
Thread Style	end
Thread Type	Metric
Thread size	M3.5 x 16mm
Unit Count	100 count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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10784CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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5 days ago

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1 month ago

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