Countersunk Head Solid Rivets

When zero protrusion is required – mating parts, clean design, or aerodynamics – countersunk head solid rivets are the answer. The tapered head sits flush with the surface. The trade‑off: you must pre‑drill a countersink. But when flush is required, it is worth the extra step.

Countersunk vs. Flat Head – The Difference

90° vs. 100° – Which Angle?

Match your countersink tool – a 100° rivet in a 90° countersink will sit proud; a 90° rivet in a 100° countersink will sit too deep.

One Real Application – Electronic Enclosure

A control panel manufacturer needed flush fasteners for stacking enclosures. Round head rivets scraped mating surfaces. We supplied 304 stainless countersunk head solid rivets – 4.0mm shank, 8.0mm head, 90° angle, 12.0mm length. Heads sat flush. No more scraping. No more gaps.

What We Need From You – And What We Offer

We manufacture countersunk head solid rivets in five materials:

What you provide: shank diameter (1.5–8.0mm), head angle (90° or 100°), material, finish, and your material stack thickness. We calculate the overall length. You don‘t have to guess.

Sample lead time: 5–10 days standard; custom tooling: 15–20 days.

How We Form the Countersunk Head – And Check It

The head angle must match your countersink tool exactly – a 1° deviation and the head sits proud or too deep.

Our process:

Die design – The angle is cut into the heading die. We grind each die to your exact angle.

First article verification – Every first article is checked on an optical comparator. Head angle confirmed.

Test setting on your material – We set sample rivets into your actual material and check flush fit with a 0.05mm feeler gauge.

Production checks – Same test every 2,000 pieces.

What we check:

Trusted by Customers Across Industries

Two Questions We Answer Often

Q: "90° or 100° – which one should I choose?"

A: Choose the angle that matches your existing countersink tool. 90° is standard for most general‑purpose applications – furniture, electronics, automotive. 100° is common in aerospace and defence. If you are unsure, 90° is compatible with the vast majority of standard countersink bits. Send us a sample of your countersink tool – we can verify the match before production.

Q: "Do countersunk head solid rivets weaken the material?"

A: A properly designed countersunk joint does not weaken the material. For thin materials (under 1.5mm), we recommend a shallower countersink or switching to flat head rivets to avoid excessive material removal. In the electronic enclosure case above, the 1.8mm panel thickness was sufficient.