Self-Tapping Hex Bolts

Gangtong Zheli is a leading manufacturer and supplier, we provide self tapping hex bolts in high quality to wholesalers around the world. We have the newest designs at cheap prices. Self-tapping hex bolts are a special type of fastener that combines a hexagonal head with a self-tapping thread.  They can directly drill into and create matching threads in base materials without pre-existing threads (such as thin metal sheets, plastics, and composite materials), achieving fast and secure connections without the need for pre-tapping or using nuts.

Self-Tapping Hex Bolts are widely used in applications requiring efficient assembly, lightweight design, and reduced manufacturing steps, such as automotive bodywork, electrical enclosures, lighting equipment, building curtain walls, home appliance manufacturing, storage racks, and new energy equipment. Their "drill, tap, and lock in one" characteristic significantly improves production efficiency and reduces labor and tooling costs, making them an ideal choice for modern automated assembly lines.

Core Performance and Technological Advantages

Based on our years of experience in self-tapping fastener research and development, process optimization, and on-site customer service, our self-tapping hex head bolts have undergone several technological upgrades in materials, structure, and surface treatment, possessing the following core advantages:

1. Efficient Self-Tapping Design for Fast and Time-Saving Installation

- Drill point design (Type AB, B, BP, etc.): The tip features a drill bit structure, allowing direct penetration of steel plates 0.5–6mm thick without pre-drilling.

- Thread forming/cutting dual mode:

- Forming type: Suitable for soft metals, no chips, tighter connection.

- Cutting type: With chip removal grooves, suitable for thick plates or hard materials.

- Hexagonal head: Supports rapid tightening with electric/pneumatic tools, increasing assembly efficiency by more than 30%.

2. Multiple Materials and Strength Grades to Adapt to Different Substrates

- Carbon steel series:

- Grade 8.8: General purpose, suitable for general steel structures and cabinet assembly.

- Grade 10.9: High strength, used for automotive structural components and heavy equipment.

- Alloy steel/surface hardened steel: Improves drill point wear resistance and extends service life.

- Stainless steel (A2-70, A4-80): Corrosion resistant, suitable for outdoor, marine, and food/pharmaceutical equipment.

3. Precision Manufacturing Process Ensures Consistency and Reliability

- Cold heading + heat treatment integrated molding: High connection strength between the head and the screw, preventing breakage.

- High-precision thread rolling and drill point grinding: Ensures accurate drilling and stable thread formation.

- Heat treatment control: Surface hardness HRC 45–55, good core toughness, strong torsional resistance.

4. Advanced Surface Treatment to Enhance Corrosion Resistance and Lifespan

- Carbon steel models available with:

- Cold galvanizing: Environmentally friendly, salt spray test ≥ 72 hours.

- Dacromet: Chromium-free coating, corrosion resistance for over 500 hours, no hydrogen embrittlement risk.

- Zinc-nickel alloy: High temperature and high corrosion resistance, suitable for automotive engine compartments.

- Stainless Steel Model: Naturally passivated, no electroplating required, environmentally friendly and durable

5. Vibration-resistant and anti-loosening for more reliable connections

- Flanged type available (Flanged Self-Tapping Bolt): Increases bearing surface to prevent loosening

- Nylon insert/serrated flange: Provides extra locking force, suitable for high-vibration environments

- Torque-tension control design: Ensures stable pre-tightening force, avoiding overtightening or loosening

Typical Application Scenarios

Our self-tapping hex bolts have been widely used in various industries, helping customers reduce costs, improve efficiency, simplify processes, and enhance product reliability:

Automotive Manufacturing: Car body panels, interior brackets, lighting installation, replacing welding and riveting

Building Curtain Walls: Aluminum panels, color steel plate connections, no pre-embedded nuts required

Industrial Enclosures: Electrical control cabinets, distribution box panel fixing, quick installation

Photovoltaic Brackets: Solar panel and purlin connections, strong weather resistance for outdoor use

Furniture and Shelving: Metal frame connections, supporting quick assembly

Why Choose Our self tapping hex bolts?

Authoritative Certification, Quality Assurance

- Certified by ISO 9001, IATF 16949, RoHS, REACH, and other international standards

- Products comply with ISO, DIN, GB, JIS, and other national standards, exported to 30+ countries worldwide

- Material certificates, test reports, and certificates of conformity are provided for each batch, ensuring full traceability

Owned Production Lines, Controllable Process

- Self-built cold heading, heat treatment, thread rolling, surface treatment, and drill tail grinding workshops

- Equipped with spectrometers, tensile testing machines, salt spray chambers, metallographic microscopes, torque testers, and other testing equipment

- Achieves full-process quality control from raw materials to finished products

Professional Technical Support and Customer Service

- Provides selection guides, torque recommendations, installation videos, and CAD drawings

- Supports sample trials, non-standard customization, OEM labeling, and bulk supply

- Technical team responds 24/7 to resolve installation problems such as jamming, stripping, and breakage

FAQ

Q1: Can self tapping hex bolts be used for stainless steel plates? 

A: Yes, we recommend using a cutting-type screw and matching the appropriate rotational speed to avoid thread damage.

Q2: Is pre-drilling required?

A: Standard self-tapping screws can be installed directly without pre-drilling, but pre-drilling is recommended for extremely thick or high-hardness materials.

Q3: What is the difference between Grade 8.8 and Grade 10.9?

A: Grade 10.9 has higher strength and is suitable for high-load connections. A torque wrench should be used to control the tightening force.

Q4: How to prevent self-tapping screws from stripping?

A: Ensure the base material thickness is appropriate, use the correct rotational speed, avoid overtightening, and choose high-quality branded products.

Q5: What are the minimum order quantity and delivery time?

A: The minimum order quantity for standard products is 500 pieces. Samples are shipped in 3-5 days, and bulk orders in 7-15 days. Expedited shipping is available.