Product Description

A cap nut is a type of nut with a closed dome-shaped top designed to cover and seal the threaded end of a bolt, serving protective, anti-loosening, safety, and decorative functions. It features the following characteristics:

The top is dome-shaped or closed, unlike standard nuts which have an open hole; one end is sealed.
The product resembles a small cap.
It still has internal threads and can be screwed onto a bolt just like a standard nut.

Our cap nuts are made of high-quality stainless steel with a smooth finish, combining durability with decorative appeal to meet a wide range of mechanical, construction, and decorative needs. Want to know more about our products and pricing? Click the button below to contact us!

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Basic Specifications

Common Standards: DIN 917 (short type), DIN 1587 (long type)
Thread Sizes: M3–M20 metric coarse thread
Thread Tolerance: 6H
Material: Low-carbon steel / Stainless steel A2-70
Strength Grade: Carbon steel Grade 4, 6, 8; Stainless steel Grade 70
Surface Treatment: Zinc-plated (blue-white zinc / colored zinc), blackened, natural finish, stainless steel passivated

Product Features

Closed-top design

Protects bolt ends and prevents scratches.

Aesthetic and durable

Domed shape with a polished finish for an elegant appearance.

Excellent corrosion resistance

Suitable for outdoor, coastal, and humid environments.

Easy installation

Standard hex design allows for quick installation using a wrench or socket.

Applications

Furniture Hardware: Tables, chairs, bed frames, decorative components
Outdoor Facilities: Guardrails, balustrades, landscape installations
Automotive and Motorcycle: Body trim, mechanical fasteners
Machinery and Equipment: Protection for exposed machine bolts
Public Facilities: Playground equipment, fitness equipment, safety guardrails