M3 x 30mm Screws 200pcs Hex Socket Head Cap Screws Bolts for 3D Printer DIY

Introducing our 200pcs M3 x 30mm Hex Socket Head Cap Screws, the ideal fastening solution designed to meet the demands of both professional industrial applications and daily DIY projects. Crafted with precision and durability in mind, these metric screws combine high-strength performance, superior corrosion resistance, and user-friendly design to deliver reliable results every time.

12.9 Grade Alloy Steel for Heavy-Duty Performance
Engineered from 12.9 grade alloy steel, these bolts stand out with exceptional tensile and shear strength, making them perfect for heavy-duty fastening scenarios—from securing industrial supports and heavy machinery to assembling robust furniture and equipment. Unlike ordinary screws, their 12.9 grade hardness ensures they can withstand high loads without deformation or breakage, providing long-lasting stability for even the most demanding tasks.

Black Zinc Plated Finish: Corrosion Resistance & Clean Use
The black zinc plated finish is more than just aesthetic; it’s a protective barrier crafted through advanced electroplating technology. Our oil-free design eliminates greasy residues, so you can handle and install the screws without staining your hands or tools, streamlining your workflow and ensuring a clean, professional finish. What’s more, this plating has passed a 200+ hour salt spray test in compliance with ISO 9227:2022 standards, resisting corrosion even in harsh environments such as outdoor humidity, coastal high-salinity areas, and damp workshops.

Precision Engineering for Effortless Installation
Precision is at the core of these screws, with high-accuracy half-threads that maintain their integrity even after electroplating. The smooth thread engagement ensures effortless screwing without jamming, while the allen socket drive (hex socket) allows for easy, secure installation with standard allen keys—reducing the risk of slipping and damaging the screw head. Compatible with a wide range of nuts and connectors, these m3x30mm screws offer versatile use across automotive, electronics, construction, and DIY projects.

Strict Quality Control & Ample Quantity
We take quality seriously, which is why every batch of our screws undergoes strict sampling inspection. From coating thickness and salt spray resistance to thread precision and hardness, all indicators meet international standards, guaranteeing consistent, reliable performance. With 200 pieces per pack, you’ll have an ample supply for large projects or ongoing use, eliminating the need for frequent restocks.

Whether you’re a professional mechanic, industrial worker, or DIY enthusiast, these 12.9 grade hex socket head cap screws deliver the strength, durability, and convenience you need. Invest in a fastening solution that doesn’t compromise on quality—choose our m3x30 screws for a seamless, long-lasting performance in every application.