DIN1587 Hex Domed Cap Nut with Nickel Galvanized White Blue Zinc Plated

DIN 1587 Key Information on Hexagon Domed Cap Nuts

I. Standard Overview

• ‌Standard Name‌: Hexagon Domed Cap Nuts. Current versions include ‌DIN 1587-1987‌ (legacy) and ‌DIN 1587-2021‌ (updated, heavy-duty design), applicable to metric thread specifications.

• ‌Version Differences‌:

• The 1987 version covers M4-M24 sizes, with non-preferred sizes (e.g., M14, M18) noted in parentheses.

• The 2021 version refines dimensional tolerances and clarifies thread specifications (coarse/fine pitch) and material requirements.

II. Structural Design

1. ‌Head Design‌

• Full-metal self-locking structure with a domed cap for vibration resistance and sealing.

• Heavy-duty design (m value increased), e.g., M12 nuts have a thickness of 12mm, exceeding standard hex nuts.

2. ‌Dimensional Features‌

• ‌Hexagon Width Across Flats (s)‌: Matches standard hex nuts (e.g., M10: s=17mm).

• ‌Cap Diameter (dk)‌: Aligns with nominal diameter (d), e.g., M6: dk=11mm.

III. Specifications & Parameters

1. ‌Size Range‌

• ‌Nominal Diameter‌: Covers ‌M4-M24‌, with fine-pitch options added in the 2021 version (e.g., M12 fine pitch: 1.5mm).

• ‌Length Range‌: Varies by size; e.g., M8 nuts range from 8-50mm.

2. ‌Typical Parameter Examples‌

   Size	d (Nominal Diameter)	P (Coarse Pitch)	m (Thickness)	s (Width Across Flats)
   M6	6mm	1.0mm	8.04mm	10mm
   M12	12mm	1.75mm	12.0mm	19mm
   M20	20mm	2.5mm	20.2mm	30mm
   Data sourced from DIN 1587-2021 standard tables.

IV. Materials & Surface Treatments

• ‌Common Materials‌: Carbon steel (strength grades 4.8/8.8), stainless steel (A2-70/A4-80), aluminum alloy.

• ‌Surface Treatments‌: Plain, zinc-plated (blue/white, color), Dacromet, etc., for corrosion resistance.

V. Applications

• ‌Machinery Manufacturing‌: Vibration-prone equipment, pumps, and valves requiring secure fastening.

• ‌Automotive Industry‌: High-load components like chassis and engine assemblies.

• ‌Construction‌: Structural steel bridges and heavy machinery installations.