1 x Screw Medium Countersunk Head With Serration T20 4X30 Thread Length: 21 Zinc Plated

1 x Screw Medium Countersunk Head With...

1 x Screw Medium Countersunk Head With Serration T20 4X30 Thread Length: 21 Zinc Plated

Name: 1 x Screw Medium Countersunk Head With Serration T20 4X30 Thread Length: 21 Zinc Plated
Brand: Screw Express
SKU: 2642403002
Price: 1.61 GBP
Availability: InStock

Reference 2642403002_1

In stock 56908 Pièces

£1.61 Incl VAT

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Screw Medium Countersunk Head With Serration T20 4X30 Thread Length: 21 Zinc Plated

Packaging

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See all available dimensions in this range Dimensions shown in millimeters (mm)

Product Details

Diameter: 3
Length

Length

How do I measure the length of a screw?

The length of a countersunk screw is measured with the head. For all other heads, the length is measured under the head.: 32
Drive Type: Torx
Size Drive Type: T20
Material: Steel
Coating: ZINC PLATED White

ZINC PLATED White

Zinc plating 3 to 5 µm

All our zinc-plated parts meet this specification (unless otherwise stated).

🛡️ Corrosion protection: low
Thin 3 to 5 µm zinc coating, suitable for environments with low exposure.

🧂 Salt spray resistance: 24 to 96 h
Indicative resistance before the appearance of rust, depending on the coating finish.

🏠 Recommended environment
Indoor applications or environments with very low exposure to moisture.

🔩 Threads preserved
The low coating thickness limits dimensional variations and helps maintain thread accuracy.
COLOR: Grey
Sub product family: Countersunk Head
WEIGHT For THERE unit: 1.68 GR

In stock 56908 Items

ean13 3663072028524

Description

Screw Medium Countersunk Head With Serration T20 4X30 Thread Length: 21 Zinc Plated
Diameter = 4, Length = 30, Coating = Zinc Plated, Material = Steel, Drive Type = Torx, Size Drive Type = T20
Other Reference : 3617501912724 QUVIAMTF0430 5117 3663072028524

Use Cases

L\'Atelier du Dôme C. (vis-express.fr)
2026-07-26

It is used on geodesic dome structures, timber frame for demountable residences for permanent habitation. I use 4x30 screws for fixing my triangular exterior panels in the 19mm 3-ply frame.