Hongniu Fasteners DIN603 Hex Bolt with Large Half-Round Head and Square Neck / Carriage Bolt Factory Supply

• Customization: Available
• Material: ODM/OEM
• Type: Hexagon Head
• Model NO.: DIN603
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI, GB
• Grade: ODM/OEM
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: ODM/OEM
• Freight: Real-Time Quotation
• Shipping Time: 4-40 Working Days
• Production Time: 0-35 Working Days
• MOQ: 10000PCS
• Transport Package: Carton Package
• Specification: ODM/OEM
• Trademark: ODM/OEM
• Origin: China
• Package Size: 23.00cm * 23.00cm * 25.00cm
• Package Gross Weight: 23.000kg

Product Description

Choose us, choose quality. Your reliable partner in fastening solutions.

Support the production and customization of various fasteners.
In Chinese, "Hongniu" means strength and excellence.
Our products live up to our name — high-quality fasteners that take your products to the next level.

Hongniu Fasteners

Business cooperation is based on honesty and trust.
We will do our utmost to be your reliable and long-term supplier, safeguarding the quality of your products.
Our relationship is not merely that of a buyer and a seller — we are partners who depend on each other to create both wealth and reputation.

Product Overview

The DIN603 carriage bolt features a large half-round head combined with a square neck, which prevents rotation during installation. It is widely used in wooden structures, machinery fastening, agricultural equipment, and automotive applications.
The smooth head provides tamper-resistant performance and a clean appearance.

Size (Diameter)	Length (mm)	Square Neck Size (mm)	Head Diameter (mm)	Thread Pitch	Standard
M6	10–120	6.15–6.6	16	1.0	DIN603
M8	16–150	8.15–8.6	20	1.25	DIN603
M10	20–200	10.15–10.6	24	1.5	DIN603
M12	25–220	12.15–12.6	30	1.75	DIN603
M16	30–240	16.15–16.6	38	2.0	DIN603

Key Features

Packaging & Shipping

1. Standard: DIN603 / ISO8677
2. Head Type: Large half-round (mushroom) head
3. Neck Type: Square neck for anti-rotation
4. Material Options: Carbon steel, Stainless steel 304 / 316
Surface Treatment: Zinc plated, Hot-dip galvanized, Black oxide, Plain
5. Thread Type: Metric coarse / fine
6. Application: Wood structures, machinery, automotive, furniture, building hardware

1. Bulk + Cartons + Pallets
2. Small box / color box / plastic box available
3. Custom logo packaging accepted
4. Shipping: FOB / CIF / EXW, support sea/air/express

Company Profile

Company introduction

Yangzhou Hongniu Import and Export Co., Ltd. is the foreign trade subsidiary of Jiangsu Hongding Automotive Parts Co., Ltd.
It was founded in June 2000. Located in Tangzhuang Town Industrial Park, Gaoyou City, with convenient transportation.
The company covers an area of 35000 square meters and currently has over 300 employees, including 70 high-level and intermediate professional and technical personnel. Registered capital of 20 million yuan, total assets of 78 million yuan, and fixed assets of 56 million yuan. 
Main products: Various types of automotive parts and fasteners, castings and forgings, etc. 
Widely used in industries such as aerospace, machinery, wind power, textiles, automotive manufacturing, petroleum, forging, etc.
We have maintained cooperative relationships with dozens of large and medium-sized enterprises in China, and are highly valued by our customers due to our good reputation and excellent quality.

Why Choose Us 

1. 20+ Years Manufacturing Experience
2. ISO9001 Certified Factory
3. Support OEM / ODM & Custom Packaging
4. Fast Delivery and Competitive Price
5. Professional Export Team for the Europe, Australia, North and South America,etc.

Certifications

FAQ

Please feel free to talk more with us!

Q1: What is the minimum order quantity?
A1: Products in stock with no MOQ. If you need us to produce, the MOQ is 10,000pcs.
Q2: Can you provide a sample? 
A2: Sure, some samples are provided free of charge, but not including freight. 
Q3: How long is your delivery time? 
A3: Generally, it is 10-15 days if the products are in stock. or it is around 30 days to produce, and it is according to quantity. 
Q4: What is your payment method? 
A4:  T/T, 30% deposit in advance, balance payment before loading.  Order less than 5,000USD, 100% payment to reduce the bank charges. 
Q5: Can you customize the product according to the requirements of drawing sheets and so on? 
A5: Yes, please feel free to talk more details with us and send us the design drafts.