A4-70 Torx Coach Screws Marine Grade 316 Stainless Salt Water Resistant

A4-70 Torx Coach Screws/ Marine Grade 316 Stainless/ Salt Water Resistant / Batch Orders Guanbiao Hardware

Marine-grade A4 (316) stainless steel Torx coach screws. Superior corrosion resistance for docks, boats & coastal structures. Torx drive ensures secure installation. Passivated finish.

Designed for demanding industrial applications, these Heavy-Duty Torx Carriage Bolts feature reinforced Torx Plus® drive (5-point star) for exceptional torque transmission and anti-tamper performance. The enlarged square neck provides superior grip in wood and metal, while the deep-driven recess resists stripping. Perfect for high-vibration environments and critical security installations.

Primary Uses & Applications:
- Bridges, conveyor systems & structural steel frameworks
- Railway components and heavy transport equipment
- Theft-deterrent fixtures (e.g., utility boxes, street furniture)
- Marine and offshore installations

Surface Treatment/Finishes:
* **Passivation (Standard):** Essential chemical process removing free iron particles and enhancing the natural chromium oxide layer for maximum corrosion resistance.
* **Electropolishing:** Optional premium finish. Removes surface micro-imperfections, further enhances corrosion resistance, improves cleanability (ideal for marine/food contact areas), and provides a smooth, bright appearance.
* **Plain Mill Finish (2B):** Standard rolled finish after passivation. Functional and corrosion-resistant.

How to Use:

1. **Pre-drill:** Crucial for stainless steel in wood to prevent galling/seizing and ensure smooth driving. Drill a pilot hole slightly smaller than the screw's shank diameter. **Use sharp drill bits!** For self-drilling points (Tek), pre-drilling may be reduced/eliminated in softer woods or thin metal overlays.
2. **Lubricate:** Apply a **stainless steel specific anti-seize compound** (e.g., nickel-based) to the threads to drastically reduce friction and prevent galling (thread cold-welding).
3. **Align & Drive:** Insert screw, ensuring square neck engages properly. Use the **correct Torx bit** (e.g., T25 for M8). Drive at **moderate speed** with consistent pressure. Avoid excessive RPMs which cause heat and increase galling risk. Ensure the driver bit is fully seated and in good condition.

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Dongguan Guanbiao Hardware Products Co., Ltd., established in 2013, is a screw hardware processing factory integrating R & D, production and sales, focusing on electronic and electrical appliances, computer radiator, communication equipment, lighting, motor, motor, medical equipment, sports equipment, auto parts, baby stroller accessories and other industries. Its main products include all kinds of iron, stainless steel, copper, aluminum and alloy Precision small screws, spring screws, loose screws, stainless steel screws, step screws, plum blossom screws, slender screws, anti-theft screws, non-standard customized screws, stainless steel rivets, shafts, pins, CNC parts and stamping parts. The first mock exam the second mock exam is two punch, two die four punch, three die six punch, four die four punch, six die six punch, die closing machine, part forming machine, automatic lathe, CNC lathe and so on, and the diameter is 1mm-20mm, the length is 1mm-300mm.

The company introduced imported automation equipment, combined with mature technology and precision equipment, to ensure product quality, control quality from the source, and adhere to technological innovation.

Our business philosophy is "integrity, innovation, efficiency, win-win", your satisfaction is our eternal pursuit, looking forward to become your sincere partner!    wechat:+8613423026460