introduction to products：
Self-Locking Domed Cap Nuts DIN986 Black are specialized fasteners. They have a domed cap that gives a smooth, finished look and a self-locking design to prevent loosening. Made from carbon steel or alloy steel, they undergo a black surface treatment (like black oxide or black zinc plating) for enhanced wear and corrosion resistance.
Following the DIN986 standard, these nuts are ideal for applications where aesthetics and secure fastening are important, such as in automotive interiors (trim pieces, dashboard components), furniture manufacturing (decorative joints), medical equipment (where clean lines and safety matter), and electronics (enclosure fastenings). They come in various sizes to match different bolt diameters, ensuring a snug and reliable fit.
Instructions for Use：
Align the self-locking domed cap nut with the corresponding bolt or threaded stud. Use a wrench or socket that fits the nut’s hexagonal portion (under the domed cap) to tighten it. The self-locking feature, often from a nylon insert or a deformed thread, will engage as you tighten, preventing the nut from coming loose due to vibration or movement. Tighten to the recommended torque for the specific material and application to ensure a secure hold without damaging the threads.
| Thread Size | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | ||||
| d | |||||||||||||
| P | Pitch | Coarse thread | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | ||
| Fine thread 1 | / | / | / | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 2 | ||||
| Fine thread 2 | / | / | / | / | -1 | -1.25 | / | / | 1.5 | ||||
| e | min | 7.74 | 8.87 | 11.05 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 | 33.53 | |||
| h1 | 5.6 | 6 | 7.5 | 8.9 | 10.5 | 13.5 | 15.5 | 16.5 | 21 | ||||
| h2 | 9.6 | 10.5 | 12 | 14 | 18.1 | 22.5 | 26.4 | 27.5 | 35 | ||||
| m1 | 3.2 | 4 | 5 | 6.4 | 7.8 | 9.6 | 11.7 | 12.5 | 17 | ||||
| m2 | 2.9 | 3.2 | 4 | 5.5 | 6.5 | 8 | 9.5 | 10.5 | 14 | ||||
| r | 2.5 | 3 | 3.5 | 4.6 | 5.8 | 6.8 | 7.8 | 8.8 | 10.8 | ||||
| s | 7 | 8 | 10 | 13 | 17 | 19 | 22 | 24 | 30 | ||||
| per 1000 units ≈ kg | 1.4 | 1.55 | 3.3 | 5.3 | 10.7 | 19 | 26.8 | 37.1 | 111 | ||||
Hebei Duojia Metal Products Co., Ltd. was formerly known as Yonghong Expansion Screw Factory. It has over 25 years of professional experience in manufacturing fasteners. The factory is located in the China Standard Room Industrial Base - Yongnan District, Handan City. It conducts online and offline production and manufacturing of fasteners as well as one-stop sales service business.
The factory covers an area of over 5,000 square meters, and the warehouse covers an area of over 2,000 square meters. In 2022, the company carried out industrial upgrading, standardized the production order of the factory, improved the storage capacity, enhanced safety production capacity, and implemented environmental protection measures. The factory has achieved a preliminary green and environmentally friendly production environment.
The company has cold pressing machines, stamping machines, tapping machines, threading machines, forming machines, spring machines, crimping machines, and welding robots. Its main products are a series of expansion screws known as "wall climbers".
It also produces special-shaped hook products such as wood tooth welding sheep eye ring screws and machine tooth sheep eye ring bolts. In addition, the company has expanded new product types from the end of 2024. It focuses on pre-buried products for the construction industry.
The company has a professional sales team and a professional follow-up team to safeguard your products. The company guarantees the quality of the products it offers and can conduct inspections on the grades. If there are any problems, the company can provide professional after-sales service.
Our export countries include Russia, South Korea, Britain, France, Germany, Italy, Canada, Mexico,Brazil, Argentina, Chile, Australia, Indonesia, Thailand, Singapore, Saudi Arabia, Syria, Egypt, Tanzania.Kenya and other countries. Our products will be spread all over the world!
WHY CHOOSE US?
1.As a factory-direct upplier,we eliminate middleman margis to offer you the most competitive pricing for high-quality fasteners.
2.our factory pass the ISO 9001 and AAA certification .we have the hardness testing and the test of zinc coating thickness for galvanized products.
3.with full contrl over production and logistic,we guarantee on-time delivery even for urgnt orders .
4.our engineering team can customize faseners from prototype to mass production , including unique thread designs and anti-corrosion coatings.
5.From carbon steel hex bolts to high-tensile anchor bolts ,we provide a one-stop solution for all your fastener needs.
6.If any defect is found ,we’ll reship replacements within 3weeks of our cost .
