Gardette Groupe, manufacturer of taper pins with an internal thread, DIN 7978 - ISO 8736

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The Gardette group is a renowned manufacturer of DIN 7978 / ISO8736 taper pins with an internal thread. These mechanical fasteners, offer a reliable solution for precise and sturdy fastening in line with international standards, ideal for applications that require easy dismantling.

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Technical specifications for tapered pins with internal thread - DIN 7978 - ISO 8736

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• Standard: DIN 7978 - ISO 8736.

• Shape: Cone-shaped pin with an internal thread, making them easily extractable with an extracting screw.

• Tolerances: Generally in line with H8 for nominal diameter.

• Taper angle: Standard ratio (1:50), allowing for solid fixing in the joint without clearance.

• Common materials:
  • C45 steel: With their good mechanical strength, these pins are ideal for standard applications.
  • Alloy steel (42CrMo4): Well-suited to environments with high dynamic loads.
  • Stainless steel (AISI 303 or 316): Recommended for corrosive environments and environments that require strict hygiene.

• Internal thread: Compliant with ISO standards & the right size to fit extracting screws, allowing for easy disassembly.

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Inside the manufacturing process of DIN 7978 internally threaded taper pins

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The first step in the process is choosing a raw material, generally 58-62HRC steel or another alloy steel, depending on the strength and durability required.

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• Equipment used: automatic CNC saws for precisely cut semi-finished steel bars.‍
• Precision: Initial length adjusted to minimise material waste and ensure repeatability.

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Machining the taper and tapping the hole

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The taper or cone shape is achieved via precision machining, ensuring precise geometry for the pins.

• Machinery used:
  • CNC lathes: Guaranteed precision machining of the taper with a strict angle tolerance (1:50).
  • CNC machining centres: For drilling and making the internal thread in one go, for optimal positioning and concentricity.

• Specific steps:
  
• • Straightening out the ends.
  • Machining the taper, with dimensional checks during production.
  • Axial drilling, followed by ISO standard tapping with specialised tools to achieve a clear, precise thread.

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Heat treatment

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Taper pins undergo heat treatment in order to enhance their mechanical properties.

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• Treatment types:
  • Quenching & tempering: Improves overall mechanical performance.
  • Nitriding: For better resistance to abrasion and corrosion.
  • Case-hardening: For increased surface hardness while still maintaining good resilience.

• Equipment used: Controlled atmosphere furnaces, for treatment that is both uniform and in line with industry standards.

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Here at Gardette, we know that every detail is important when producing high-quality taper pins. That's why we use specially designed machines along with meticulous processes, making sure that each of our taper pins meets even the highest of standards.

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Our taper pins are mainly made of C45 steel, a material known for its sturdiness as well as its excellent mechanical properties. We offer several different surface treatment operations to optimise the pins' effectiveness:

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• Phosphatising: Reduces friction when installing.
• Galvanising: Protects against corrosion in the case of outdoor/humid environments.
• Shot peening: Improves surface roughness and optimises fit.

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Why should you choose Gardette for your DIN 7978 - ISO 8736 taper pins?

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1. Precise, zero-clearance fastening thanks to its 1:50 taper angle.
2. Simple to disassemble: Thanks to their internal thread, these taper pins are fully extractable using an extracting screw, without damaging the surrounding components.
3. Sturdiness: Increased resistance to mechanical forces thanks to its heat treatment and rigorous dimensional tolerances.
4. Made-to-order production: Custom sizing, materials and treatment processes to meet the particular requirements of engineers and individual industrial applications.
5. Certified quality: Systematic quality control at each production stage in order to guarantee full compliance with DIN and ISO standards.