M6 Stainless Steel A2 A4 Countersunk Bolt โ Factory Manufacturer
Countersunk Bolts Wholesale | Factory Direct Supply
We manufacture a full range of countersunk bolts, stainless countersunk bolts in carbon steel, stainless steel, and alloy steel with zinc plating, Dacromet, or black oxide finishes. Fast delivery with flexible MOQ from 20 pcs and custom packaging supported. Ideal for distributors and importers seeking reliable wholesale fasteners. ๐ Contact us today for factory prices and free samples!
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๐ฆ Low MOQ available โ small quantity orders accepted
Product Overview
Countersunk bolts, also known as flathead bolts, feature a conical head that sits flush within countersunk holes, creating a smooth surface finish. This design makes them ideal for applications where aesthetics, aerodynamics, or space-saving installation are critical, such as furniture manufacturing, automotive components, electronics enclosures, and architectural fixtures. Their precise threading and flush head ensure secure fastening with a clean, professional look.
Illustration showing a countersunk bolt flush mounted in a surface, highlighting the smooth, level finish.
Core Attributes and Specifications
| Attribute | Details |
|---|---|
| Types | – Standard Countersunk Bolts – High-Strength Countersunk Bolts – Stainless Steel Countersunk Bolts – Countersunk Allen Bolt |
| Material Options | – Carbon Steel: Grades 4.8, 8.8 (zinc-plated for corrosion resistance) – Stainless Steel: 304/316 (A2/A4 marine-grade) – Alloy Steel: Grade 10.9 (heat-treated for high-tension use) |
| Surface Finish | – Zinc Plating (clear, blue, yellow; RoHS/REACH compliant) – Passivated (stainless steel) – Black Oxide or Dacromet (for harsh environments) |
| Head Design | – Countersink Angle: Standard 82ยฐ or 90ยฐ (ISO 1003, ASME B18.3) – Head Diameter: 6โ30 mm (0.24″โ1.18″) – Flush Mount: Sits level with the surface for aesthetic finish |
| Thread Types | – Metric: M3โM24 (ISO 965-1) – Imperial: 1/4″โ1″ (UNC/UNF) – Fine Threads available for precision applications |
| Length Range | 5 mm (0.2″) โ 100 mm (4″) standard; custom lengths up to 200 mm (8″) upon request |
| Standards Compliance | – ISO 7045 (Metric) – ASME B18.3 (Inch) – DIN 963 (German Standard) |
| Corrosion Resistance | – 500+ hours salt spray (zinc-plated) – 1000+ hours (stainless steel) |
| Packaging Options | – Bulk: 25 kg cartons with anti-rust paper – Retail: Blister packs (100/500 pcs) – Custom: Anti-static bags for electronics or branded packaging |
| Certifications | – ISO 9001:2015 – RoHS, REACH, CE – Material Test Certificates (MTC) |
| Minimum Order Quantity (MOQ) | – 20 pieces (standard sizes, ready stock) – 500 pieces (stainless steel or custom finishes; small-batch sampling supported) |
| Delivery Time | – 5 days (standard) – 7 days (custom head angles/sizes) |
| Customization | – Non-standard countersink angles (100ยฐ, 110ยฐ) – Special coatings (PTFE, color-matched finishes) – Laser engraving for part numbers or company logos |
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Simplified icons representing main materials and surface finishes of our countersunk bolts.
Custom Packaging Available
We offer tailored packaging solutions including branded boxes, anti-static bags, and retail-ready blister packs to meet your specific market and logistics requirements. Whether you need bulk packaging or customized retail packs, our flexible options support your branding and shipping needs.
Key Selling Points
๐ง Flush-Mount Aesthetics
Sits perfectly within countersunk holes for a seamless surface finish โ essential for furniture, automotive trims, and architectural installations.
๐ง Space-Saving Design
Eliminates protrusions, making them ideal for sliding doors, machinery covers, and low-profile assembly.
๐ง Superior Corrosion Resistance
Marine-grade 316 stainless steel and Dacromet-coated options ensure durability in harsh coastal, industrial, and outdoor environments.
๐ง Precision Engineering
Tight tolerances on head angles and threads guarantee compatibility with standard countersink drills and tools.
๐ง Global Standards Compliance
Fully compliant with ISO, ASME, and DIN standards, ensuring seamless integration into international OEM projects.
Reliable After-Sales Support
Our experienced engineering team is available to assist with technical drawings, torque specifications, and quality certifications. We are committed to providing professional support to ensure your project runs smoothly from sampling to mass production.
Common Misapplications to Avoid
โ Incorrect Hole Angle: Always match the countersink angle (82ยฐ or 90ยฐ) to the bolt head for proper seating and load distribution.
โ Over-Tightening: Prevent thread stripping by using torque wrenches, especially on soft materials like aluminum or plastics.
โ Inadequate Material Selection: Avoid using low-grade carbon steel for high-tension applications; upgrade to alloy steel or stainless steel as required.
Why Choose Our Countersunk Bolts
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Direct Factory Supply: Competitive pricing with strict quality control and ISO-certified production lines.
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Flexible MOQ: Supports small orders for testing and urgent needs alongside bulk wholesale supply.
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Custom Solutions: Tailored head sizes, angles, coatings, and laser markings to match your exact project requirements.
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Fast Delivery: Ready stock shipped within 3-5 days, custom specifications in 7-10 days, with global logistics support.
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Reliable Quality: Each batch is inspected with material test certificates provided upon request.
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Global Shipping & Efficient Logistics
We provide fast worldwide shipping with competitive freight rates. Our flexible fulfillment supports Full Container Load (FCL), Less than Container Load (LCL), and express courier options, ensuring timely delivery no matter where you are.
Frequently Asked Questions
- What is your minimum order quantity (MOQ)?
- Our standard MOQ is 20 pieces for carbon steel zinc-plated bolts and 500 pieces for stainless steel or custom finishes. Small batch samples are also supported.
- Can I order samples before bulk purchase?
- Yes, we gladly provide free or low-cost samples for quality testing and evaluation.
- Do you provide material test certificates?
- Yes, every batch is accompanied by Material Test Certificates (MTC) upon request.
- How long is your typical delivery time?
- Standard products ship within 5 days, and custom orders usually ship within 7-10 days.
- Do you support custom head designs or special coatings?
- Yes, we offer non-standard countersink angles, special coatings like PTFE, and laser engraving for logos or part numbers.
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