DIN 7340 Rivets

Nuote Metals is a China-based manufacturer of DIN 7340 rivets, producing both Shape A (flat head) and Shape B (round head) variants. With over 10 years of experience in tubular rivet production, we understand the dimensional precision this standard demands. Available in carbon steel, stainless steel, brass, copper, and aluminum, with diameters from 1mm to 10mm. ISO 9001 certified. Free samples available. Contact us today.

What Are DIN 7340 Rivets?

They are tubular (hollow) rivets manufactured by cutting lengths from metal tube stock, then forming a head on one end. Unlike deep-drawn hollow rivets, which have a tapered internal contour, DIN 7340 tubular rivets have a cylindrical inner and outer contour – a key distinction that affects how they set and perform in assembly.

The standard, maintained by the German Fasteners Standards Committee (FMV), specifies dimensions, masses, and technical delivery conditions for two distinct head shapes:

The current version is DIN 7340:2011-03, which supersedes the 1993 edition.

How to Read a DIN 7340 Rivet Designation

A complete DIN 7340 rivet designation follows a specific format that encodes all critical dimensions. Here is an example from the standard:

RN A 3 × 0.3 × 20 DIN 7340 Cu

This naming convention ensures every DIN 7340 rivet is fully specified and traceable to the standard.

Materials and Finishes for Them

DIN 7340 rivets can be manufactured from multiple materials. Nuote Metals offers the following options:

Standard finishes: Zinc‑plated, nickel‑plated, passivated, lacquered, antique, plain.

DIN 7340 does not limit materials to these options – the standard accommodates steel, stainless steel, copper, brass, and aluminum.

Dimensional Range – What DIN 7340 Covers

The standard covers DIN 7340 rivets with nominal diameters from 1mm to 10mm. Wall thickness and length are specified per application.

Shape A (Flat Head) – Typical Dimensions

Shape B (Round Head) – Typical Dimensions

Custom lengths and wall thicknesses are available upon request. Nuote Metals can produce DIN 7340 rivets to your exact specifications.

DIN 7340 vs. Deep‑Drawn Hollow Rivets – The Difference

This distinction matters. A DIN 7340 rivet is cut from tube stock – the inner and outer contours are cylindrical. A deep‑drawn hollow rivet (often called an eyelet) starts as sheet metal and is progressively drawn into shape, resulting in a tapered internal contour.

If your application requires a uniform inside diameter – for wiring, lacing, or precise pivots – DIN 7340 rivets are the right choice.

One Real Application – Plastic Electronics Mounting Bracket

A manufacturer of consumer electronics needed to mount a plastic bracket to a metal chassis inside a smart home device. The plastic bracket held a circuit board and needed to be secured permanently without cracking the plastic or adding unnecessary weight. The engineering team had specified DIN 7340 rivets for this assembly – Shape A (flat head), aluminum, 3mm diameter, 0.3mm wall thickness, 6mm length.

The flat head was critical – the bracket had limited clearance, and a round head would have interfered with the board placement. The aluminum material kept the overall assembly lightweight, which was important for the portable device. And the tubular design set with minimal force, preventing stress cracks in the plastic.

We supplied 5052 aluminum DIN 7340 rivets – 3.0mm shaft, 4.5mm flat head, 0.3mm wall thickness, 6.0mm length, plain finish. The cylindrical inside contour maintained consistent wall thickness for reliable flaring. The flat head sat cleanly within the tight clearance. The customer tested 1,000 rivets across 500 brackets. After thermal cycling and vibration testing, zero failures. They now order our tubular rivets in batches of 200,000 pieces annually.

How We Manufacture them – Tube‑Cutting + Heading

DIN 7340 rivets are manufactured from tube stock – cut to length with a head formed on one end. This is the method specified by the standard.

1. Tube Stock Procurement – Certified tube stock from approved mills – steel, stainless, brass, copper, or aluminum. Each batch comes with a mill test certificate and heat number.

2. Incoming Inspection – Tube stock checked for outside diameter (±0.02mm), wall thickness, and material composition. Spectrometer confirms grade. Out‑of‑spec material is rejected.

3. Tube Cutting – The tube is cut to precise blank length. Each blank becomes one DIN 7340 rivet.

4. Heading – The cut tube blank is placed into a heading press. A carbide die forms the head – Shape A (flat) or Shape B (round) – on one end. Polished dies prevent surface marks.

5. Trimming – Flash around the head edge is removed.

6. Tumbling – Micro‑burrs are eliminated.

7. Plating or Coating – Applied as required.

8. Final Inspection – 100% optical sorting. AQL sample manually verified.

Sample lead time: 5–7 days standard; custom tooling: 15–20 days.

One Rivet, Eight Checks – How We Ensure DIN 7340 Compliance

Every batch of DIN 7340 rivets passes through eight quality gates:

Raw material diameter check – Laser micrometer (±0.02mm). Any coil outside range is rejected.

Raw material composition check – Spectrometer verification of grade.

First article appearance check – First 10 rivets inspected under magnification for cracks, burrs, defects.

First article dimensional check – Inner diameter, outer diameter, head diameter, head height, wall thickness, and length verified on optical comparator against DIN 7340 specifications.

In‑process checks – 5 rivets every 500 pieces. Any drift stops the press.

Test setting (trial flaring) – Every 2,000 pieces, set 3 rivets into sample material. Clinch inspected for symmetry and cracks.

Salt spray test (if required) – ASTM B117 testing. Certificate issued with batch.

Final outgoing inspection – 100% optical sorting. AQL sample manually verified. Full documentation issued.

What Our Customers Say – Real Feedback

We let our customers speak for us. The images above show real feedback from manufacturers who have used our DIN 7340 rivets in their production lines – from electronics builders to automotive suppliers to furniture manufacturers.

They come back to us for the same reasons:

• Standard compliance – Every rivet meets DIN 7340 dimensional requirements
• Consistent cylindrical bore – Uniform inside diameter for reliable assembly
• Precision fit – Matched to drawing specifications
• Reliable delivery – Samples ship in 5–7 days, production on schedule

Three Questions We Answer Often

Q: "Can I get samples before ordering production quantities?"

A: Yes – we offer samples for all our products. For standard existing specifications, samples are provided free of charge – you only pay the shipping cost. For custom sizes or custom tooling, sample availability and lead time depend on the specific requirements. Please contact our sales team with your drawing or specification, and they will advise on sample cost and delivery timeline.

Q: "What is the difference between DIN 7340 Shape A and Shape B rivets?"

A: Shape A has a flat head – a low-profile head that sits near flush with the surface. It is ideal for clearance-limited assemblies where a protruding head would interfere with mating parts. Shape B has a round head – a taller, domed head that provides maximum head strength and is the most common choice for general-purpose assemblies. Both types are fully specified under DIN 7340.

Q: "How do I specify a DIN 7340 rivet correctly on my drawing?"

A: Use the standard designation format: RN [Shape] [d₁] × [s] × [l] DIN 7340 [Material] – where d₁ is the nominal shaft diameter, s is the wall thickness, and l is the nominal length. For example: RN A 4 × 0.4 × 12 DIN 7340 Cu specifies a copper, Shape A (flat head), 4mm diameter, 0.4mm wall thickness, 12mm length rivet. If you are unsure about any dimension, send us your assembly stack thickness – we will recommend the correct specification.