✅ Factory-Direct Dimensional Accuracy

All button head screw sizes are manufactured to ISO 4759-1 Class A tolerances. Head diameter variance ≤0.13mm, ensuring consistent fit across every batch.

✅ Optimized Countersink for 1/4-20 Flat Head Screw

Our countersink for 1/4-20 flat head screw features a precisely controlled 82° included angle ±0.5°, with depth tolerance within 0.08mm for flush seating every time.

✅ One-Stop Service – Material to Logistics

From material selection (carbon steel, 304/316 SS, alloy) to heat treatment, plating, and global shipping – we handle it all under one roof.

✅ 10+ Years Export Expertise – 30+ Countries

Trusted by buyers in USA, Germany, UK, France, Australia, and more. We understand local standards, documentation, and logistics requirements.

🚜 Agricultural Machinery

A leading tractor manufacturer in Germany reduced assembly rejects by 27% after switching to our precision button head screw sizes with matched countersink for flat head fasteners. – 600K units/year volume

🚗 Automotive Parts Assembly

An American Tier-1 supplier achieved 99.6% first-pass yield on a brake component line by using our optimized countersink for 1/4-20 flat head screw design. – 2.4M screws/year

🏗️ Construction & Structural Fixings

A UK infrastructure contractor standardized on our flat head screws for steel decking, cutting installation time by 18% and eliminating countersink rework. – 50+ projects across Europe

“We switched to Boen for our entire MRO fastener supply. Their button head screw sizes are the most consistent we’ve ever used. Inventory variance dropped to near zero.”

– James R., Supply Chain Manager, USA ⭐⭐⭐⭐⭐

“The countersink for 1/4-20 flat head screw they provided is machined to perfection. We’ve eliminated a full inspection step. Excellent partner for our automotive line.”

– Klaus D., Quality Manager, Germany ⭐⭐⭐⭐⭐

“Fast delivery, accurate paperwork, and the screws are exactly as specified. We’ve placed 12 repeat orders this year. Highly recommended for industrial buyers.”

– Sarah L., Operations Director, UK ⭐⭐⭐⭐⭐

📌 What are the standard button head screw sizes you offer?

We stock #6 through 3/8″ in common lengths, with custom sizes available up to 1/2″. All button head screw sizes meet ASME B18.6.3 and ISO 10642 standards.

📌 How do I determine the correct countersink for a 1/4-20 flat head screw?

For a 1/4-20 flat head screw, the countersink should have an 82° included angle and a depth of 2.82mm (0.111″) to achieve full flush seating. Our countersink for 1/4-20 flat head screw is engineered to this exact spec.

📌 Can you provide custom button head screw sizes?

Yes. We offer OEM/ODM customization for head diameter, height, drive type, and material. Lead time for custom tools is 10–14 days.

📌 What is the typical lead time for bulk orders?

Standard sizes: 15–20 days. Custom sizes: 20–30 days. We offer expedited shipping for urgent orders – just ask.

📌 Do you offer free samples for testing?

Yes. Qualified buyers can request a free sample kit covering up to 10 sizes. You only pay shipping. This helps you validate our button head screw sizes and countersink for 1/4-20 flat head screw quality before committing.

📌 What certifications do your fasteners have?

We are ISO 9001:2015 certified. Our products comply with CE, RoHS, and REACH. Specific certifications (UL, FCC, GS) are available per project requirements.

📌 How do you ensure dimensional accuracy across batches?

Every production lot is inspected using CMM (coordinate measuring machine) and optical comparators. We provide a Certificate of Analysis with each shipment.

📌 What is your return policy?

We offer a 100% satisfaction guarantee. If the product does not meet agreed specifications, we replace or refund – no questions asked.