Big Bolt & Black Coach Bolts | Wholesale

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🔩 Big Bolt & Black Coach Bolts – Wholesale Direct from China’s Powerhouse Factory

Stop overpaying for industrial-grade fasteners. Get factory-direct pricing, ISO-certified quality, and 30-day lead times on big bolt & black coach bolts – trusted by 30+ countries.

📦 Get Free Quote in 24h

⚠️ The Real Cost of Cheap Fasteners

Procurement managers and technical directors face the same hidden risks when sourcing big bolt and black coach bolts from unreliable suppliers.

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Hidden Price Inflation

Markups from middlemen add 25–40% on big bolt orders. Your TCO balloons without you noticing.

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Inconsistent Quality

Black coach bolts with poor heat treatment cause shear failures on-site. Downtime costs $10k+ per hour.

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Shipping Nightmares

Split shipments, lost containers, and customs delays. 37% of buyers report logistics as their top frustration.

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Compliance Risks

Non-certified fasteners fail audits. CE, ISO 898, and RoHS gaps put your projects at legal risk.

🏭 Why Boen Fasteners Delivers What Others Can’t

Since 2010, Handan Boen Fastener Manufacturing Co., Ltd. has been the trusted OEM/ODM partner for automotive, agricultural machinery, and construction buyers across 30+ countries. We don’t just sell big bolt and black coach bolts – we engineer supply chain peace of mind.

✅ Factory-direct pricing – cut out 2–3 intermediary layers
✅ Full traceability – from raw material mill test certs to final inspection
✅ 30-day lead time – even for custom lengths and coatings
✅ One-stop service – material selection, packaging, logistics, all in one hand

📸 Handan Boen – Hanguang Industrial Park, Hebei Province

📊 Big Bolt & Black Coach Bolts – Technical Specifications

Our big bolt and black coach bolts meet or exceed ISO 898, DIN 603, and ASME B18.2.1 standards. Choose from the table below for your exact application.

Parameter	Big Bolt (Hex & Heavy Hex)	Black Coach Bolts
Diameter Range	M12 – M64 (1/2″ – 2-1/2″)	M6 – M30 (1/4″ – 1-1/8″)
Length Range	30mm – 600mm (custom up to 1m)	40mm – 500mm (custom available)
Grade / Strength	Grade 4.8, 8.8, 10.9, 12.9	Grade 4.8, 5.8, 8.8 (DIN 603)
Material	Carbon steel, alloy steel, stainless steel 304/316	Carbon steel, stainless steel 304, A2-70
Coating / Finish	Plain, black oxide, zinc plated, HDG, Dacromet	Black oxide, zinc plated, hot-dip galvanized, plain
Thread Type	Coarse, fine, UNC, UNF, metric	Coarse metric, UNC, self-tapping
Head Style	Hex, heavy hex, socket head	Dome head, mushroom head, countersunk
Certifications	ISO 898, CE, RoHS, FCC, ISO 9001	DIN 603, CE, ISO 9001, RoHS
MOQ (Wholesale)	1,000 pcs per size	2,000 pcs per size
Lead Time (FOB Tianjin)	20–30 days	20–30 days

📌 Custom sizes, coatings, and packaging (bulk bags, palletized, barcode labels) available on request.

🔨 Where These Fasteners Deliver Maximum Value

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Agricultural Machinery

Black coach bolts for harvester tines, ploughs, and trailer assemblies. High shear strength, vibration-resistant.

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Construction & Structural

Big bolt used in steel frame connections, bridge scaffolding, and heavy-duty anchoring. Grade 8.8 & 10.9 standard.

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Automotive & Trailer

Black coach bolts for chassis, mudguards, and leaf spring assemblies. OEM-approved dimensions.

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Energy & Infrastructure

Big bolt for wind tower flanges, solar tracker frames, and substation structures. HDG coating for corrosion resistance.

🤝 Trusted by Global Buyers – 30+ Countries Served

"We switched to Boen for our big bolt supply chain and reduced our unit cost by 22% while improving delivery reliability. Their black coach bolts meet our DIN 603 specs perfectly." – Thomas Richter, Procurement Manager, Germany

💬 Real-time Conversations with Our Clients

📱 Our team responds within 2 hours. Get instant quotes, shipping updates, and technical support via WhatsApp.

❓ Frequently Asked Questions

Q1: What is the difference between a big bolt and a black coach bolt?

A: A big bolt typically refers to heavy hex or structural bolts used in high-load applications (grade 8.8 and above). Black coach bolts (DIN 603) have a domed head and square neck under the head to prevent rotation, commonly used in wood-to-metal and agricultural assemblies. Both are available in black oxide or zinc-plated finishes.

Q2: What is the minimum order quantity (MOQ) for wholesale big bolt?

A: Our standard MOQ is 1,000 pcs per size for big bolt and 2,000 pcs per size for black coach bolts. For sample orders or trial batches, we can accommodate smaller quantities with a short lead time.

Q3: Do you offer custom lengths and coatings for black coach bolts?

A: Yes. We offer OEM/ODM customization on length, thread length, coating (black oxide, zinc, HDG, Dacromet), and packaging. Send us your drawing or specification, and we’ll provide a tailored solution within 48 hours.

Q4: How do you ensure quality for big bolt and black coach bolts?

A: We follow ISO 9001 quality management with in-house tensile testing, hardness testing, and dimensional inspection. Each batch comes with a mill test certificate. Third-party inspection (SGS, BV) is also available upon request.

Q5: What is the typical lead time and shipping cost to the USA or Europe?

A: Lead time is 20–30 days after order confirmation. For FOB Tianjin or CIF to major ports (Los Angeles, Hamburg, Rotterdam), we provide competitive freight rates. A 20ft container of big bolt or black coach bolts typically ships within 25 days.

Q6: Do you have certifications like CE, RoHS, and ISO 9001?

A: Absolutely. We hold ISO 9001:2015, CE, RoHS, FCC, and UL certifications. Our black coach bolts comply with DIN 603 and our big bolt range meets ISO 898 and ASME standards. Certificates are available for download or upon request.

Q7: How can I get a free sample or quote?

A: Simply fill out the contact form below, email us at shuan@fastenboen.com, or WhatsApp +86 15630072814. We’ll respond within 24 hours with a detailed quote, sample availability, and shipping options.

⭐ What Our Customers Say

Markus Weber
Procurement Lead, Germany

"We use Boen’s black coach bolts for our trailer assembly line. Consistent quality, perfect thread fit, and 30% cost savings vs. our previous supplier."

James Peterson
Operations Manager, USA

"Their big bolt inventory saved us during a critical project. Fast shipping, great communication, and the grade 10.9 bolts passed all tests."

Chen Wei
Supply Chain Director, Singapore

"Boen is our go-to for black coach bolts. They handle everything from material certs to logistics. Zero hassles, always on time."

✍️ About the Author – David L. Morrison
David is a Senior Fastener Engineer & International Trade Advisor at Handan Boen Fastener Manufacturing Co., Ltd. With over 15 years in the industrial fasteners sector, he has helped 200+ buyers across Europe, the Americas, and Southeast Asia optimize their bolt supply chains. He specializes in big bolt structural applications and black coach bolts for agricultural and construction use.