304 SS Button Head Self-Tapping Screws Type B Blunt Point Marine & Outdoor A2-70 Passivated

304 SS Button Head Self-Tapping Screws Type B Blunt Point Marine & Outdoor A2-70 Passivated

Premium A2-70 stainless steel button head self-tapping screws with Type B point. Phillips drive, passivated finish. Resists rust & salt water. For marine, food processing & chemical equipment. M4-M8 sizes.

Demanding corrosive environments require durable fasteners. Our **A2 Stainless Steel Button Head Self-Tapping Screws with Type B (Blunt) Point** deliver exceptional rust and chemical resistance combined with reliable thread-forming performance. Manufactured from A2-70 (304) stainless steel, they excel in **marine, coastal, outdoor, food processing, and chemical exposure** applications. The **Type B blunt point** ensures precise thread cutting in pre-drilled holes without damaging thin materials, while the **low-profile button head** minimizes protrusion and snagging. The **Phillips drive** provides secure tool engagement. Passivation enhances corrosion resistance.

Primary Uses & Applications:

* Marine hardware & boat building (deck fittings, hatches, railings).
* Outdoor equipment & enclosures exposed to weather/salt spray.
* Food & beverage processing machinery & conveyors.
* Chemical plant instrumentation & tank fittings.
* Pharmaceutical equipment & cleanroom fixtures.
* Architectural metalwork (stainless railings, cladding).
* High-corrosion industrial environments (pulp & paper, water treatment).
* Joining stainless steel sheets or components.

Surface Treatment/Finishes:
* **Passivation (Standard):** Essential chemical process removing free iron and enhancing the natural chromium oxide passive layer for maximum corrosion resistance. Slightly matte finish.
* **Electropolishing (Optional):** Creates a smoother, brighter, more reflective surface. Further enhances corrosion resistance, improves cleanability (ideal for food/pharma), and slightly reduces friction during installation.

How to Use:

1. **Prevent Galling:** **ESSENTIAL STEP!** Apply a **stainless steel specific anti-seize compound** (e.g., nickel-based) generously to the screw threads before installation. This drastically reduces friction and prevents galling (cold welding/seizing), especially in stainless-on-stainless applications.
2. **Prepare Hole:** **Drill a precise pilot hole** slightly smaller than the screw's **minor diameter** (core dia. - approx. 75-85% of nominal shank dia.) in the top material. Hole quality is critical for Type B performance. Use sharp drills, deburr.
3. **Align & Insert:** Position materials. Insert the screw.
4. **Drive:** Insert the **correct size key/bit**. Drive the screw at a **MODERATE SPEED** with **steady, firm pressure**. The Type B point will cut clean threads. **Avoid high RPMs** which generate heat and dramatically increase galling/seizing risk.
5. **Tighten:** Seat the button head firmly. **DO NOT OVERTIGHTEN.** Use the recommended torque for A2 stainless steel. Stop once resistance increases significantly after head seating.
6. **Removal:** Use the correct key/bit. Apply steady torque. Anti-seize should facilitate removal. If seized, do not force - risk breaking the head.

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