Home » Acorn nut » Cap nut | A4 | DIN 917
Kupolmuttrar i syrafast A4 rostfritt stål i olika storlekar med sexkantsfattning och polerad yta.
Teknisk måttritning och dimensionstabell för kupolmuttrar DIN 917 i syrafast A4 rostfritt stål med sexkantsprofil.
Kupolmuttrar i syrafast A4 rostfritt stål i olika storlekar med sexkantsfattning och polerad yta.
Kupolmuttrar i syrafast A4 rostfritt stål i olika storlekar med sexkantsfattning och polerad yta.
Teknisk måttritning och dimensionstabell för kupolmuttrar DIN 917 i syrafast A4 rostfritt stål med sexkantsprofil.
Kupolmuttrar i syrafast A4 rostfritt stål i olika storlekar med sexkantsfattning och polerad yta.

Cap nut | A4 | DIN 917

In stock 164 items available
SKU: 101304
4.0 1 review
1.00 kr Incl. VAT
Thread size
Volume discount for your order
>500 SEK - 5%
>1000 SEK - 5% discount and free shipping
>2000 SEK - 10% off and free shipping
Description

Cap nut DIN 917 in A4 stainless steel is a durable and corrosion-resistant fastener that protects the end of protruding threads while providing a neat and smooth finish. It is manufactured from high-quality stainless steel, and its head shape provides extra protection against damage. The product is perfect for applications where both aesthetics and function are important.

AREA OF USE

Cap nuts are used in constructions where protection and aesthetics are required, such as furniture, cars, and buildings. They prevent sharp threads from protruding and protect against injuries.

TECHNICAL SPECIFICATIONS

Product type: Cap nut
Standard: DIN 917
Grade: A4/AISI316
Thread type: Metric
Head shape: Domed
Grip type: Hexagon

FREQUENTLY ASKED QUESTIONS (FAQ)

What is the primary function of a cap nut (DIN 917)?

DIN 917 specifies a low hexagon nut with a domed, closed top (cap) that completely encapsulates the end of a threaded rod or screw:

  • Mechanical and injury protection: The domed cap covers sharp thread edges and protruding screw ends. This prevents clothing from snagging or people from injuring themselves on sharp threads upon contact.

  • Protection against dirt and corrosion: The dome encapsulates the internal thread and prevents water, moisture, dirt, and road salt from penetrating the screw thread. This ensures the joint does not rust internally.

  • Aesthetic finish: Provides a clean, finished, and professional look for all visible screw joints in interiors, railings, vehicles, and outdoor structures.

Why is acid-proof steel A4 (AISI 316) the best choice for cap nuts?

Cap nuts are often used in exposed, visible locations outdoors and in marine environments where corrosion requirements are high:

  • Superior protection in marine environments: A4 steel (1.4401 / AISI 316) contains 2–3% molybdenum, which allows the nut to withstand saltwater, chlorides, road salt, and corrosive chemicals without forming surface rust or discoloration.

  • No surface coating that can wear off: Because the nut is solid acid-proof steel, it does not suffer from peeling paint or broken galvanization, which electro-galvanized cap nuts often experience during tightening.

  • Long-lasting shine and aesthetics: Preserves its fine finish and mechanical strength for decades, even during harsh weather and constant moisture.

What should one consider regarding screw length and installation with a DIN 917 cap nut?

  1. Adjust the screw protrusion: Because the cap is closed and DIN 917 is a low-profile model, there is a limited thread depth inside the nut. Measure the screw or threaded rod protrusion carefully so that it does not bottom out in the cap before the nut fastens the surface.

  2. Use thread lubricant: When installing A4 components, it is recommended to apply assembly paste or anti-seize to the thread to prevent seizing/cold welding (galling).

  3. Combine with a flat washer: Use an acid-proof A4 flat washer (DIN 125) or fender washer (DIN 9021) under the cap nut to protect the surface from scratches when the nut is tightened with a wrench.