DIN 3871 Ll Type a Locking Boltfor Brazed & Non-Brazed Tube Thread Fittings

• Customization: Available
• Material: ODM/OEM
• Type: Hexagon Head
• Model NO.: DIN 3871
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI, GB, JIS, BSW, GOST
• 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: Depends on The Size and Stock
• 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

The DIN 3871 LL Type A Locking Bolt is designed for secure locking of tube thread fittings, suitable for both brazed and non-brazed hydraulic pipe connections.
It ensures reliable axial fixing, vibration resistance, and long-term sealing performance in hydraulic and pneumatic systems.

Widely used in hydraulics, fluid power systems, industrial machinery, and automotive applications.

• Designed according to DIN 3871 standard

• Suitable for LL (Light Series) tube fittings

• Compatible with brazed and non-brazed pipe connections

• High resistance to vibration and loosening

• Ensures secure axial positioning of fittings

• Available in carbon steel and stainless steel

• Multiple surface finishes for corrosion protection

Item	Description
Standard	DIN 3871
Type	LL Type A
Product Name	Locking Bolt for Tube Thread Fittings
Series	LL (Light Series)
Application	Brazed & Non-Brazed Pipe Connections
Thread Type	Metric
Function	Axial locking & anti-loosening
Installation	Mechanical tightening

Material & Surface Finish

Material Option	Surface Treatment	Corrosion Resistance
Carbon Steel	Zinc Plated (White / Yellow)	Standard
Carbon Steel	Black Oxide	Low
Stainless Steel (AISI 304 / 316)	Natural / Passivated	High

Other coatings available upon request.

Size Range

Thread Size	Tube OD (mm)	Series
M10 × 1	6	LL
M12 × 1.5	8	LL
M14 × 1.5	10	LL
M16 × 1.5	12	LL
M18 × 1.5	15	LL
M22 × 1.5	18	LL

Custom sizes available according to drawings or samples.

Applications

• Hydraulic tube assemblies

• Fluid power systems

• Industrial equipment

• Automotive & commercial vehicles

• Construction machinery

• Agricultural machinery

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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.

Cooperative Partners

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.

 

Finish	Description
Natural / Plain	No surface treatment
Zinc Plated	Corrosion protection
Black Oxide	Industrial appearance
Painted	Custom colors available
Anodized	For aluminum rivets

Quality Control

• Incoming material inspection

• Dimensional inspection

• Tensile & shear strength testing

• Surface finish inspection

• Random sampling before shipment

Packaging & Delivery

Item	Details
Packaging	Small boxes / cartons / pallets
Custom Packaging	Available
MOQ	Negotiable
Delivery Time	15-30 days
OEM / ODM	Supported

Why Choose Us

• Professional fastener manufacturer & exporter

• Stable quality and competitive pricing

• Rich experience in DIN / ISO standards

• One-stop fastener supply service

• Fast response & technical support
  

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 and is 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: 20 million yuan, total assets: 78 million yuan, and fixed assets: 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. 
Please feel free to talk more with Gianna about fasteners

 

 

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.