3.5 mm Socket Head Screws & 5mm Cap Screw | Wholesale

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Wholesale 3.5 mm Socket Head Screws & 5mm Cap Screw — Factory-Direct Precision Fasteners

Tired of overpaying for inconsistent 3.5 mm socket head screws and 5mm cap screw supplies? Boen Fasteners delivers ISO-certified, factory-direct pricing with 10+ years export expertise — cutting your procurement costs by up to 37%.

📦 Get Free Quote in 24h 📋 Download Product Brochure

✅ Free samples available | ✅ MOQ as low as 500 pcs | ✅ Ship to 30+ countries

🏭 Boen Manufacturing Facility — 10+ years of precision fastener production

⚠️ The Hidden Cost of Cheap Fasteners

Procurement & engineering leaders — you already know the headache.

🔴 32% of batches fail torque specs — leading to production line stoppages and rework costs averaging $4,700/hour.

🔴 2-3 week delays from overseas suppliers with poor communication — your 5mm cap screw shipment arrives late, and your line goes idle.

🔴 Hidden fees add 18-25% — surcharges for packaging, material certifications, and rushed logistics eat your margin.

🔴 Inconsistent thread quality on 3.5 mm socket head screws causes stripping and field failures — warranty claims cost 3x the part price.

You need a partner who delivers consistent quality, transparent pricing, and on-time delivery — every time.

✅ Why Boen Fasteners Is Your Trusted Source for 3.5 mm Socket Head Screws & 5mm Cap Screw

Factory-direct manufacturing with full traceability — from raw material to your dock.

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Factory-Direct Pricing

Eliminate middlemen. Our 5mm cap screw pricing is 30-40% lower than distributor channels. MOQ from 500 pcs.

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Precision Grade 12.9 Alloy Steel

All 3.5 mm socket head screws meet ISO 898-1 Class 12.9 — 1,220 MPa tensile strength. Black oxide or zinc-plated finish.

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7-15 Day Express Delivery

From our Handan factory to your warehouse. DDP & FOB options available. Real-time tracking included.

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Full Certification Pack

ISO 9001, CE, RoHS, and material test reports provided with every shipment. No compliance surprises.

📞 Talk to a fastener engineer today

Get your free sample kit and technical datasheet within 48 hours.

✉️ Request Sample & Datasheet

📊 Technical Specifications — 3.5 mm Socket Head Screws & 5mm Cap Screw

All dimensions in millimeters (mm) unless noted. Custom lengths and drive types available for OEM/ODM orders.

Parameter	3.5 mm Socket Head Screw	5mm Cap Screw (M5)
Thread Diameter	3.5 mm (M3.5)	5.0 mm (M5)
Thread Pitch	0.6 mm (coarse)	0.8 mm (coarse)
Head Diameter (max)	6.8 mm	8.5 mm
Head Height (max)	3.5 mm	5.0 mm
Hex Socket Size	2.5 mm	4.0 mm
Material Grade	Alloy Steel 12.9 or 304 Stainless	Alloy Steel 12.9 or 316 Stainless
Tensile Strength	1,220 MPa (min)	1,220 MPa (min)
Surface Finish Options	Black oxide, zinc-plated, plain	Black oxide, zinc-plated, HDG, plain

📌 Custom lengths (3–80 mm) and drive types (Torx, Phillips, hex) available for OEM orders. Request a custom quote →

🔧 Available Lengths: 6mm / 8mm / 10mm / 12mm / 16mm / 20mm / 25mm / 30mm / custom

📋 Packing: 100 pcs/bag, 1,000 pcs/box, or bulk pallet (20,000+ pcs)

🔩 Where 3.5 mm Socket Head Screws & 5mm Cap Screws Deliver

From automotive assembly lines to agricultural machinery — these fasteners are the backbone of precision engineering.

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Automotive Parts & Sub-Assemblies

Used in ECU brackets, sensor mounts, and interior trim. Our 5mm cap screw is the preferred spec for a Tier-1 supplier in Germany — zero defects over 2.4M pcs shipped.

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Agricultural Machinery

3.5 mm socket head screws secure control panels and hydraulic valve covers. With zinc-plated finish, they resist corrosion in high-humidity farm environments.

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Construction & Structural Fixings

Ideal for steel bracket connections, handrail systems, and solar panel frames. Grade 12.9 strength ensures long-term reliability under vibration.

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Industrial Machinery & Robotics

Precision 5mm cap screw used in linear guides, actuator housings, and robotic arm joints. Consistent torque performance reduces calibration time.

📈 Case Study: European Agricultural OEM

Switched from a local distributor to Boen for their 3.5 mm socket head screws. Result: 42% cost reduction per unit, 99.98% on-time delivery over 18 months, and zero quality rejections. They now source 12 SKUs exclusively from us.

❓ Frequently Asked Questions — 3.5 mm Socket Head Screws & 5mm Cap Screw

What is the minimum order quantity (MOQ) for 3.5 mm socket head screws?

Our standard MOQ for 3.5 mm socket head screws is 500 pcs per size. For 5mm cap screw orders, the MOQ is also 500 pcs. For custom lengths or special coatings, MOQ may be 1,000 pcs. We offer trial orders of 200 pcs for new customers — just contact us.

Can you supply 3.5 mm socket head screws in stainless steel?

Yes. We offer 304 stainless steel and 316 stainless steel for both 3.5 mm socket head screws and 5mm cap screw products. 316 grade is recommended for marine or chemical environments. All stainless variants come with material test certificates.

What is the typical lead time for wholesale orders?

For standard 3.5 mm socket head screws and 5mm cap screw sizes, production takes 7-10 working days. Express shipping (DDP/FOB) adds 5-7 days to USA/Europe. Custom orders typically require 12-15 working days. We provide real-time tracking for every shipment.

Do you provide OEM/ODM services for custom fasteners?

Absolutely. We have full OEM/ODM capability for custom lengths, head markings, drive types (Torx, Phillips, hex), and surface finishes. Simply send us your drawing or sample, and our engineering team will provide a free quotation and design review within 48 hours.

What certifications do your 5mm cap screws carry?

All our 5mm cap screw products are manufactured under ISO 9001:2015 quality management system. We also provide CE, RoHS, and full material test reports. For specific requirements, we can arrange UL or FCC certification at an additional cost. Request a compliance pack →

What payment methods do you accept for wholesale orders?

We accept T/T (bank transfer), L/C, PayPal, and Alibaba Trade Assurance. For first-time orders, we typically request 30% deposit with 70% balance before shipment. For established customers, we offer net 30 terms on qualifying orders over $5,000.

How do you handle shipping costs for international orders?

We offer FOB (Shanghai/Tianjin), CIF, and DDP shipping options. For orders over $3,000, we provide free DDP shipping to major ports in the USA, UK, Germany, and Australia. We consolidate shipments to reduce freight costs by up to 20% for regular customers.

🚀 Get Your Custom Quote for 3.5 mm & 5mm Cap Screws in 24 Hours

Join 200+ procurement teams that trust Boen for factory-direct quality, on-time delivery, and competitive pricing. Your free sample kit is ready.

📥 Get Free Quote + Sample Kit 💬 WhatsApp Us Now

📧 shuan@fastenboen.com | mary@fastenboen.com

📞 +86 15630072814 | +86 13293070568 | Mon–Sat 09:00–17:00 CST

✅ Free samples for qualified buyers ✅ 30-day money-back guarantee on first order ✅ ISO 9001 certified quality

✍️ About the Author — David Liang

David Liang is a senior fastener engineer and export operations lead at Handan Boen Fastener Manufacturing Co., Ltd., with 14 years of experience in precision fastener design, material science, and international B2B trade. He has personally overseen the quality compliance of over 50 million fasteners shipped to 30+ countries. David is a regular contributor to industry publications on fastener standardization and supply chain optimization.