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Home / Screws / GB819 Carbon Steel Iron Galvanized Countersunk Cross Screw KM Flat Head Machine Screw M3 M4 M5 M6 M8 M10 M12

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material Carbon Steel
Surface Finish Galvanized (Zinc Plated)
Head Style Flat Head (Countersunk)
Drive Type Phillips (Cross)
Thread Standard Metric (ISO)
Available Sizes M3, M4, M5, M6, M8, M10, M12
Grade 4.8 / 8.8
Application Machinery, Electronics, Construction
Corrosion Resistance Moderate (Suitable for Indoor Use)
Package Type Bulk Box or Plastic Kit

6 reviews

A

Anonymous

Mar 30, 2026

Rating: 5/5

Standard quality machine screws

Exactly as described. The cross drive grips well with standard screwdrivers. No issues with sizing on the M6 and M8 variants I used.

A

Anonymous

Mar 22, 2026

Rating: 4/5

Good value for bulk purchase

Bought a mixed kit of sizes. Most are great quality, though a couple of the M4 screws had slightly stripped threads. Overall good value.

A

Anonymous

Mar 20, 2026

Rating: 5/5

Strong and durable

Used these for a machinery repair job. They held up well under torque and didn't snap. Will definitely order again.

A

Anonymous

Mar 12, 2026

Rating: 5/5

Perfect fit for my project

These screws are exactly what I needed for assembling my metal shelving unit. The galvanized finish looks clean and the heads sit perfectly flush.

A

Anonymous

Mar 11, 2026

Rating: 3/5

Decent but not premium

They work fine for general purposes, but if you need high-tensile strength for critical loads, you might want to check the specific grade carefully.

A

Anonymous

Mar 06, 2026

Rating: 5/5

Fast shipping and great quality

Arrived earlier than expected. The zinc coating is even and provides good protection against rust in my workshop environment.

5 FAQ

Q: What is the thread pitch for the M6 size?

A: The M6 screws follow the standard metric coarse thread pitch, which is 1.0mm.

Q: Is there a warranty on these screws?

A: We guarantee our products against manufacturing defects. If you receive any defective items, please contact us within 30 days for a replacement.

Q: Do you sell these in individual sizes or only in kits?

A: We offer both individual size packs and mixed assortments. Please select your preferred option from the dropdown menu on the product page.

Q: Are these screws suitable for outdoor use?

A: While they are galvanized for some corrosion resistance, they are best suited for indoor applications. For prolonged outdoor exposure, we recommend stainless steel options.

Q: Can these be used with aluminum materials?

A: Yes, they can be used with aluminum, but please be aware that galvanic corrosion may occur over time between the steel screw and aluminum part.

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