M4 Stainless Steel Bolts & M40 Bolt M42 Bolt M48 Bolt M5 5 Bolt | Wholesale

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PRODUCT Tags

M4 Stainless Steel Bolts & M40 Bolt · M42 Bolt · M48 Bolt · M5.5 Bolt

Factory-Direct Wholesale — Engineered for Industrial & Commercial Applications

✅ ISO 9001 · CE · RoHS compliant | ✅ 10+ years export expertise | ✅ 30+ countries served

📩 Get Free Quote in 24h 📥 Download Product Brochure

📞 +86 15630072814 | ✉️ shuan@fastenboen.com

📑 Table of Contents

1. Why Buyers Struggle 2. Our Solution 3. Technical Specs 4. Applications 5. Social Proof 6. FAQ 7. Reviews 8. Strong CTA

⚡ The Real Cost of Choosing the Wrong Bolt Supplier

Every procurement and operations manager we speak to shares the same frustrations — and the numbers back them up.

🔴 37%

Higher total cost when buying through intermediaries instead of factory-direct. Markups add up fast — especially for bulk orders of M4 stainless steel bolts, M40 bolt, M42 bolt, M48 bolt, and M5.5 bolt.

🔴 23%

On-time delivery failures — a single delayed shipment can halt an entire production line. Downtime costs average $260,000/hour in automotive and heavy machinery.

🔴 41%

of technical directors report inconsistent quality — batch-to-batch variation in thread pitch, hardness, or corrosion resistance. This leads to rework, field failures, and compliance risks.

🔴 55%

of purchasing managers say hidden shipping & duties blow their budget. Without a transparent logistics partner, landed costs become unpredictable.

👉 You need a supplier who eliminates these risks — not adds to them.

🏭 Why Handan Boen Fastener Is Your Trusted Wholesale Partner

We don’t just sell fasteners — we engineer supply-chain reliability into every shipment. Here’s how we deliver for clients demanding M4 stainless steel bolts, M40 bolt, M42 bolt, M48 bolt, and M5.5 bolt in volume.

🔩

Precision Threading

6g/6h tolerance, rolled threads for superior fatigue strength

🧪

Full Material Traceability

Mill certificates for every batch of 304/316 stainless steel

🌍

Global Logistics

FOB/CIF/DDP options — we handle customs & duties

⚙️

OEM/ODM Capability

Custom head markings, packaging, and special coatings

🏭 50,000 m² production facility · 200+ skilled workers

Hanguang Industrial Park, Handan, China — Est. 2010

📋 Technical Specifications — Bulk Bolt Series

All dimensions in mm · Material: Stainless Steel 304 (A2) / 316 (A4) · Thread class: 6g · Standard: DIN 933 / ISO 4017

Product	Thread Diameter	Pitch (mm)	Length Range	Tensile Strength (MPa)	Typical Pack Qty
M4 Stainless Steel Bolt	M4 × 0.7	0.7	8 – 60 mm	≥ 500 (A2-70)	5,000 pcs/box
M5.5 Bolt	M5.5 × 0.9	0.9	10 – 80 mm	≥ 500 (A2-70)	3,000 pcs/box
M40 Bolt	M40 × 3.0	3.0	80 – 400 mm	≥ 600 (A4-80)	50 pcs/box
M42 Bolt	M42 × 4.5	4.5	100 – 500 mm	≥ 600 (A4-80)	40 pcs/box
M48 Bolt	M48 × 5.0	5.0	120 – 600 mm	≥ 600 (A4-80)	25 pcs/box

🔧 Custom lengths, coatings (Zn, Dacromet, PTFE), and drive types (hex, socket, Torx) available on request.

🏗️ Where These Bolts Perform — Real-World Applications

🚜

Agricultural Machinery

M4 stainless steel bolts and M5.5 bolts secure harvester panels, irrigation systems, and tractor cab assemblies. Corrosion resistance is critical in outdoor, humid environments.

🏗️

Construction & Structural Steel

M40 bolt, M42 bolt, and M48 bolt are used in heavy-duty connections — bridge girders, wind turbine towers, and high-rise steel frames. High tensile strength and fatigue resistance are non-negotiable.

⚡

Energy & Power Generation

Thermal power plants, solar farms, and offshore wind platforms demand bolting that withstands vibration, thermal cycling, and salt spray. Our A4-80 grade delivers.

🚛

Commercial Vehicles & Trailers

M5.5 bolt and M4 fasteners are common in brake systems, chassis brackets, and body panels. Consistent quality reduces warranty claims and field failures.

🤝 Trusted by Industry Leaders Worldwide

+ 20 more enterprise clients

🏅 Certifications: M4 Stainless Steel Bolts & M40 Bolt M42 Bolt M48 Bolt M5 5 Bolt | Wholesale

RoHS · REACH · ISO 9001:2015

"We switched to Handan Boen for our M40 bolt and M42 bolt supply — their quality consistency is unmatched. We’ve seen a 28% reduction in rework and on-time delivery improved from 72% to 97%."

— Markus Weber

Procurement Director, Müller Heavy Industries (Germany)

❓ Frequently Asked Questions

📌 What is the minimum order quantity (MOQ) for M4 stainless steel bolts and M5.5 bolts?

For standard M4 stainless steel bolts and M5.5 bolts, our MOQ is 5,000 pieces per size. For M40 bolt, M42 bolt, and M48 bolt, the MOQ is 200 pieces due to larger dimensions. We can negotiate lower MOQs for first-time trial orders.

📌 Do you offer custom head markings or packaging for OEM buyers?

Yes. We provide OEM/ODM services including custom head stamps (your logo or grade marking), special coatings (Zn, Dacromet, Geomet), and private-label packaging with barcode labels. Just share your drawings or samples.

📌 What are the typical lead times for bulk orders of M40 bolt, M42 bolt, and M48 bolt?

For standard sizes: 15–25 days after deposit. For custom sizes or coatings: 25–35 days. We offer express production for urgent orders — contact us to check availability.

📌 Which shipping terms do you offer? How do you handle customs and duties?

We support FOB (Tianjin/Qingdao), CIF, and DDP. For DDP shipments, we handle all customs clearance, duties, and door-to-door delivery so you receive a single landed cost — no surprises.

📌 Do you provide free samples for quality evaluation before bulk order?

Absolutely. We offer free samples (up to 10 pieces) for standard products. You only pay the shipping cost. This lets you verify thread fit, material grade, and finish before committing to a large volume.

📌 How do you ensure consistent quality across large batches of M4 stainless steel bolts and M5.5 bolts?

We follow a 3-stage QC process: incoming raw material inspection (chemical composition & hardness), in-process dimensional checks (thread gauge + optical comparator), and final random sampling per ISO 2859. Every batch comes with a Mill Test Certificate.

📌 What payment methods do you accept for international wholesale orders?

We accept T/T (wire transfer), L/C (irrevocable letter of credit), and PayPal for smaller amounts. For first-time clients, we typically request 30% deposit with 70% balance against copy of shipping documents.

📌 Can you help with compliance documentation for US/EU projects?

Yes. We provide compliance packages including EN 10204 3.1 certificates, REACH/RoHS declarations, DFARS (for US defense-related projects), and CE marking technical files. Our documentation is accepted by major engineering firms.

⭐ Real Reviews from Global Buyers

Jean-Pierre Dubois

⚙️ Technical Director · Eiffel Métal, France

★★★★★

"We use M40 bolt, M42 bolt, and M48 bolt for our bridge repair projects. Boen’s batch-to-batch consistency is excellent — thread fit and hardness are always within spec. Their 3.1 certificates save us weeks of verification."

Sarah Mitchell

📦 Supply Chain Manager · AgriParts Inc., USA

★★★★★

"We switched our M4 stainless steel bolts and M5.5 bolt supply to Boen. Their pricing is 22% lower than our previous distributor, and shipping via DDP means no hidden fees. Highly reliable."

Andreas Lindström

🔧 Operations Manager · Nordic Wind AB, Sweden

★★★★★

"For our offshore wind turbine towers, we need M42 bolt and M48 bolt with A4-80 grade and Dacromet coating. Boen delivered ahead of schedule and the passivation test results were perfect. Our engineer team was impressed."

✍️ Written by Michael Chen — Senior Fastener Engineer & Export Specialist

Over 12 years in industrial fastener manufacturing and supply chain optimization. Michael has personally overseen more than 800 B2B shipments to Europe, North America, and Southeast Asia, helping clients reduce procurement costs by an average of 18–25%.