What is the thread according to DIN 3852-2

Here’s a breakdown of the thread specified in DIN 3852-2:

Key Points:

• Thread Type: It primarily designates parallel threads, but also includes a tapered thread variant.
• Standard Scope: Covers dimensions, types, and designations for stud ends used in fittings, valves, and port plugs.
• Relationship to ISO Standards: Closely aligns with ISO 1179-1 for parallel threads, but offers additional types not included in that standard.

Thread Types:

DIN 3852-2 defines several thread types, each with distinct sealing methods:

1. Type B:

   • Parallel thread (similar to ISO 228-1 BSPP)
   • Metal-to-metal sealing via a cutting face at the base of the male thread

2. Type E:

   • Parallel thread
   • Sealing achieved using a bonded washer or an O-ring

3. Type G:

   • Parallel thread
   • Sealing achieved using an O-ring and a retaining ring

4. Type S:

   • Tapered thread (similar to BSP Taper)
   • Sealing achieved using a bonded washer

Additional Information:

• While DIN 3852-2 is primarily a German standard, it’s widely used in Europe and other regions.
• It’s often considered interchangeable with ISO 1179-1 for parallel threads, but the additional types offered in DIN 3852-2 provide more options for specific applications.
• Always consult the relevant standards and manufacturer’s specifications to ensure compatibility when working with hydraulic components.

Here’s a summary of the thread specified in ISO 1179-1:

Key Points:

• Thread Type: Specifies parallel threads, specifically British Standard Pipe Parallel (BSPP) threads, based on ISO 228-1.
• Scope: Covers dimensions for threaded ports (female threads) used in hydraulic fittings, valves, and other components.
• Sealing: Designed for use with elastomeric seals (O-rings, bonded washers) or metal-to-metal sealing.
• Applications: Widely used in hydraulic systems, particularly in Europe and Asia.

Thread Dimensions:

Key Dimensions:

• D1: Major thread diameter
• D2: Minor thread diameter
• D3: Outer diameter of sealing face
• D4: Inner diameter of sealing face
• L1: Maximum thread length
• L2: Minimum thread length
• L3: Depth of threaded hole

Additional Information:

• ISO 1179-1 is part of a broader standard (ISO 1179) covering various aspects of hydraulic connections.
• It’s often used in conjunction with other ISO standards for stud ends (male threads), such as ISO 1179-2, ISO 1179-3, and ISO 1179-4.
• These standards ensure compatibility between different hydraulic components from various manufacturers.

Compatibility with DIN 3852-2:

• While ISO 1179-1 and DIN 3852-2 both specify parallel threads, they have slight differences in thread dimensions and sealing methods.
• It’s essential to consult both standards and manufacturer’s specifications when working with components that might use either standard.

Here’s a breakdown of the thread specified in ISO 228-1, incorporating images for clarity:

Key Points:

• Thread Type: Specifies parallel threads, commonly known as British Standard Pipe Parallel (BSPP) threads.
• Thread Form: Whitworth thread form, characterized by rounded crests and roots.
• Sealing: Relies on elastomeric seals (O-rings, bonded washers) or metal-to-metal sealing, rather than thread interference.
• Applications: Widely used in various industries for pipes, fittings, valves, and other fluid-handling components.

Thread Dimensions:

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ISO 2281 thread dimensions, showing major diameter (D), minor diameter (d), pitch (P), and thread angle (α)

• Major Diameter (D): The largest diameter of the thread.
• Minor Diameter (d): The smallest diameter of the thread.
• Pitch (P): The distance between adjacent threads, measured along the axis.
• Thread Angle (α): The angle between the flanks of the thread, typically 55 degrees for BSPP threads.

Designation:

• Threads are designated using the letter “G” followed by the nominal size in inches (e.g., G 1/2, G 3/4).

Key Features:

• Parallel Threads: The threads run parallel to each other, unlike tapered threads.
• Whitworth Thread Form: Provides a strong and durable thread profile.
• No Thread Interference: Sealing is achieved through seals or metal-to-metal contact, not thread interference.
• Widely Used: Applicable in various industries, particularly in Europe and Asia.

Additional Information:

• ISO 228-1 is part of a broader ISO 228 standard covering various pipe threads.
• It’s often used in conjunction with other standards, such as ISO 1179-1 for hydraulic fittings.
• Ensure compatibility by consulting relevant standards and manufacturer’s specifications when working with threaded components.