4 40 Socket Head Cap Screw & 4 40 Socket Head Screw | Wholesale

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Premium 4 40 Socket Head Cap Screw & 4 40 Socket Head Screw | Wholesale

✦ Slash procurement costs by 30-40% without compromising tensile strength or dimensional accuracy. Direct factory pricing for high-volume buyers in the USA & Europe.

🚀 Get Free Quote in 24h 📞 +86 15630072814

✅ ISO 9001 Certified ✅ 10+ Years Exporting ✅ 30+ Countries Served

⚡ The True Cost of Substandard Fasteners

In the world of precision engineering and high-volume assembly, the humble 4 40 socket head cap screw is often the unsung hero—or the critical point of failure. If you're sourcing from traditional distributors or unreliable suppliers, you're likely facing these exact pain points:

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Inflation & High Per-Unit Costs

Distributor markups of 30-50% are eating into your margins. For a wholesale 4 40 socket head screw order, you are paying for middlemen, not the metal.

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Inconsistent Tolerances (Class 3A Failures)

Threads that don't gauge properly lead to assembly jams and scratched bores. This causes costly downtime on your CNC lines.

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Long Lead Times (8-12 Weeks)

Waiting for overseas containers or stockouts from local suppliers stalls production. You need a reliable partner who ships high-speed.

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Brittleness & Stripping

Low-grade 4 40 socket head cap screws strip under torque, leading to field failures. Your technical directors demand 12.9 grade reliability.

🔍 The result? Increased TCO, frustrated engineers, and a fragile supply chain. There is a better way.

✅ Boen Fasteners: The Direct Factory Solution

With over 10 years of export expertise and a factory covering 20,000 sqm, Handan Boen Fastener Manufacturing Co., Ltd. offers a comprehensive solution for your 4 40 socket head screw requirements. We don't just sell fasteners; we engineer reliability.

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Powerful Factory-Direct Pricing

Eliminate the middleman. Our 4 40 socket head cap screw wholesale pricing is typically 30-40% lower than US/EU distributors, while maintaining superior margins for us and you.

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Precision & Quality Assurance

Class 3A thread fit guaranteed. We utilize cold heading and CNC threading to ensure every 4 40 socket head screw meets strict dimensional tolerances. Hardness testing and torque analysis are standard.

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OEM/ODM Customization

Need a specific length, coating (Zn, Ni, Teflon, Dacromet), or custom head marking? We offer full OEM/ODM design capabilities. Minimum order quantities are flexible for pilot runs.

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High-Speed Delivery

Standard production lead time is just 15-25 days. Combined with our logistics partners, we ensure your bulk order of 4 40 socket head screws arrives on time, every time.

📊 Technical Specifications: 4 40 Socket Head Cap Screw

Below are the standard specifications for our high-demand 4 40 socket head cap screw and 4 40 socket head screw offerings. For custom dimensions, please contact our engineering team.

Parameter	Standard Spec	Custom Options
Thread Size	#4-40 UNC (Unified Coarse)	UNF, Metric M3
Drive Style	Hex Socket (5/64" Key)	Torx, Phillips, Slot
Material	Alloy Steel 10.9 / 12.9	316 SS, 304 SS, Brass, 17-4 PH
Hardness	HRC 39-44 (Grade 12.9)	HRC 22-32 (Grade 8.8)
Surface Finish	Black Oxide	Zinc Plated, Ni, Teflon, Dacromet
Lengths	1/8" to 1"	Up to 4" (Custom)
Packaging	Bulk Box (5,000 pcs)	Bulk Bags, Retail Blister, Kitting

🔬 *All products undergo rigorous SGS/BSI inspection protocols. Request a Factory Test Report with your quote.

🤝 Trusted by Global Industry Leaders

Our 4 40 socket head cap screws are used in critical applications across automotive, agricultural machinery, and construction. We are proud to supply companies that demand uncompromising quality.

RoHS

🏭 Handan Boen Fastener Manufacturing Co., Ltd. - Hanguang Industrial Park

💬 Real-time communication & support with our English-speaking sales team.

❓ Frequently Asked Questions (FAQs)

1. What is the difference between a 4 40 socket head cap screw and a standard machine screw?

A 4 40 socket head cap screw features a cylindrical head and a hex socket drive, allowing for higher torque clamping compared to a standard slotted or Phillips machine screw. The "socket head" design provides a cleaner look and is ideal for limited clearance applications. The 4 40 socket head screw is typically used in precision assemblies where high strength is required.

2. Do you offer 4 40 socket head screws in 316 stainless steel?

Yes, we do. Our 4 40 socket head screw inventory includes A2-70 (304 SS) and A4-80 (316 SS) grades. 316 stainless steel offers excellent corrosion resistance for marine and chemical environments. We can also apply a passivation coating for enhanced durability.

3. What is your MOQ for wholesale 4 40 socket head cap screws?

Our standard MOQ for wholesale 4 40 socket head cap screws is 10,000 pieces per size. However, we understand the need for pilot runs. We offer lower MOQs for OEM customers or sample orders to test fit and function. Contact our sales team for flexibility on your first order.

4. How do you ensure the quality of your 4 40 socket head screws?

Quality is at our core. We are ISO 9001 Certified. Every batch of 4 40 socket head screws undergoes strict inspection: dimensional checks (thread gauges), hardness testing (Rockwell), and visual inspection (surface defects). We also provide a Mill Test Certificate with every shipment upon request.

5. Can you provide custom packaging for the 4 40 socket head cap screws?

Absolutely. We offer OEM/ODM services including custom packaging. Whether you need bulk boxes, poly bags, blister packs with your logo, or specific labeling for your inventory system, we can accommodate your requirements. This is part of our one-stop service commitment.

6. What is the typical lead time for a bulk order of 4 40 socket head screws?

For a standard bulk order of 4 40 socket head screws, the lead time is 15-25 days after confirmation of the order and receipt of the deposit. For urgent orders, we have a "Fast Track" production option that can reduce this to 10 days. Shipping to the USA or Europe typically takes 20-30 days via sea freight.

7. What payment methods do you accept for international orders?

We accept T/T (Telegraphic Transfer), L/C (Letter of Credit), and for smaller transactions, PayPal or Western Union. Our standard terms are 30% deposit, 70% balance before shipment. We ensure all documentation (Bill of Lading, Packing List, Invoice, Certificate of Origin) is provided for smooth customs clearance.

⭐ What Our Customers Say

John D. ★★★★★ Procurement Manager, USA

"We switched to Boen for our 4 40 socket head cap screw supply. The cost savings were immediate—35% reduction compared to our previous distributor. The quality is consistent, and the team is very responsive."

Elena V. ★★★★★ Technical Director, Germany

"The 12.9 grade 4 40 socket head screws from Boen are exceptional. We tested them for tensile strength and thread fit—they meet our strict Class 3A specifications. They have become a reliable partner for our CNC assembly lines."

Robert K. ★★★★★ Operations Manager, UK

"Lead times were our biggest headache. Boen delivered our bulk order of 4 40 socket head cap screws in just 18 days. The logistics team kept us updated throughout. Highly recommended for high-volume buyers."

📝 About the Author

Ethan Chen

Senior Fastener Engineer & Supply Chain Strategist | 15+ Years at Boen Fasteners

Ethan specializes in high-strength fasteners and global supply chain optimization. He has helped over 200 clients in the USA and Europe reduce their procurement costs while improving product reliability. His insights drive the technical precision behind every 4 40 socket head cap screw we manufacture.