Metric Button Head Screw Dimensions & Flat Head Cap Screw | Wholesale

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Wholesale Metric Button Head & Flat Head Cap Screws – Precision Dimensions, Factory Direct Prices

Stop guessing on metric button head screw dimensions and metric flat head cap screw dimensions. Get ISO-compliant, fully traceable fasteners delivered to your door.

📩 Get Free Quote in 24h 📐 Download Spec Sheet

✅ 10+ Years Export Expertise • ✅ Shipped to 30+ Countries • ✅ ISO 9001 Certified

⚠️ The Hidden Cost of Inconsistent Fastener Dimensions

For procurement and engineering teams sourcing metric fasteners, the smallest deviation in a screw dimension can trigger a cascade of failures: assembly line stoppages, stripped threads, and rejected shipments. We hear these frustrations every day:

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Unreliable Metric Button Head Screw Dimensions

Many suppliers list standard dimensions but deliver heads that are 0.2mm too tall or sockets that are undersized, causing tool slippage.

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High Total Cost of Ownership (TCO)

Between inspection delays, rework, and urgent expedited shipping, sourcing cheap fasteners often costs 37% more in hidden operational expenses.

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Metric vs. Imperial Confusion

Engineering teams in the US often struggle to cross-reference metric flat head cap screw dimensions accurately, leading to wrong orders and project delays.

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Slow & Unpredictable Logistics

Average lead times of 6-8 weeks from overseas suppliers, with poor tracking and communication, make production planning a nightmare.

🔍 If you're a Purchasing Manager or Technical Director in automotive, agriculture, or construction, these bottlenecks directly impact your KPIs and bottom line.

✅ Boen Fastener: Standardized Precision, Guaranteed Traceability

Since 2010, Handan Boen Fastener has delivered over 500 million fasteners to 30+ countries. We don't just supply screws; we provide dimensional confidence. Our in-house QC lab uses digital calipers, thread gauges, and hardness testers to verify every batch against ISO standards.

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Powerful Factory, Direct Pricing

Eliminate middlemen. Our factory-direct model gives you access to competitive pricing without sacrificing quality or lead times.

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OEM/ODM Design Capability

Need a custom head height or drive recess? Our engineering team can modify any standard metric button head or flat head cap screw to your exact drawings.

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High-Speed Delivery

With strategic raw material stock and optimized logistics, we achieve 30% faster shipping than the industry average for bulk metric screw orders.

📐 Standard Metric Button Head & Flat Head Cap Screw Dimensions

All dimensions are in millimeters (mm) and comply with ISO 7380 (Button Head) and ISO 10642 (Flat Head).

Thread Size	Type	Head Diameter (dk)	Head Height (k)	Hex Socket Size	Tensile Strength (min)
M3	Button Head	5.5 - 5.7	1.65 - 1.85	2.0 mm	800 N/mm²
M4	Button Head	7.3 - 7.5	2.2 - 2.4	2.5 mm	800 N/mm²
M5	Button Head	9.1 - 9.4	2.8 - 3.0	3.0 mm	800 N/mm²
M6	Button Head	10.9 - 11.1	3.3 - 3.5	4.0 mm	800 N/mm²
M8	Button Head	14.5 - 14.8	4.4 - 4.6	5.0 mm	800 N/mm²
M4	Flat Head	8.4 - 8.8	2.0 - 2.3	2.5 mm	800 N/mm²
M5	Flat Head	10.4 - 10.8	2.5 - 2.8	3.0 mm	800 N/mm²
M6	Flat Head	12.4 - 12.8	3.0 - 3.3	4.0 mm	800 N/mm²

*Custom dimensions and higher tensile grades (10.9, 12.9) available upon request. Contact our engineering team for a detailed drawing review.

🚜 Automotive & Agriculture

High-vibration environments require precise thread engagement. Our metric flat head cap screws are used in tractor assembly lines across the Midwest, reducing warranty claims by 22%.

🏗️ Construction & Structural Fixings

From prefabricated buildings to steel structures, our metric button head screws provide a sleek, tamper-resistant finish with reliable clamping force.

⚙️ General Industrial Machinery

OEMs rely on our consistent metric button head screw dimensions for automated assembly lines, ensuring zero downtime due to fastener incompatibility.

💬 Frequently Asked Questions

📌 What are the standard metric button head screw dimensions for M6?

For an M6 metric button head cap screw, the standard head diameter (dk) is 10.9 - 11.1 mm, and the head height (k) is 3.3 - 3.5 mm. The hex socket size is 4.0 mm. These dimensions conform to ISO 7380. We can provide a full QC report for any batch.

📌 Do you provide a tolerance chart for metric flat head cap screw dimensions?

Yes, we provide a detailed dimensional tolerance chart for all our metric flat head cap screws, covering head angle (90°±1°), head diameter, and overall length. Our tolerances are tighter than ISO 10642 standards to ensure flush fitment.

📌 What is the minimum order quantity (MOQ) for wholesale orders?

Our standard MOQ for stock metric screws is 5,000 pieces per size. For custom OEM/ODM projects, the MOQ is 20,000 pieces. We offer flexible shipping options including FOB, CIF, and DDP to US and European ports.

📌 Can you customize the head height or drive type on a metric button head screw?

Absolutely. Our OEM/ODM service allows us to modify head height, drive recess (Torx, Phillips, Hex), and material grade (304, 316, 10.9, 12.9). Simply send your drawing or sample for a rapid quotation.

📌 How do you ensure the quality of metric flat head cap screws?

We follow a strict 3-stage QC process: 1) Incoming raw material chemical analysis, 2) In-process dimensional inspection using digital gauges, 3) Final batch sampling for hardness, tensile strength, and surface finish. Every batch is traceable.

📌 What is the typical lead time for a bulk order to the USA?

For standard stock sizes, our lead time is 15-20 days. For custom orders, it is 25-30 days. We handle all export documentation and offer door-to-door logistics for hassle-free delivery.

⭐ What Our Customers Say

"Finally, a supplier who understands the critical nature of metric button head screw dimensions. Boen's QC reports are a game-changer for our ISO audit."

David L. , Quality Manager, UK

"We saved 18% on our annual fastener spend without compromising on quality. Their metric flat head cap screw dimensions are spot on."

Carlos M. , Supply Chain Director, Spain

"The fastest shipping I've ever experienced from a Chinese manufacturer. The team at Boen made the entire procurement process smooth and transparent."

Sarah K. , Operations Manager, Canada

✍️ About the Author – David Chen

David Chen is a Senior Fastener Application Engineer at Handan Boen Fastener Manufacturing Co., Ltd. With over 15 years of experience in fastener standardization, metallurgy, and global supply chain optimization, David has helped over 200 industrial clients in North America and Europe reduce costs and improve assembly reliability. He is a regular speaker at industry trade shows on the topic of dimensional precision in metric fasteners.