Chain Bolt 4″ Zinc Plated National Hardware N236-336 Heavy Duty

Description

Product Overview

The National Hardware N236-336 chain bolt is a precision‑engineered locking solution designed for demanding environments. Constructed from high‑grade steel and finished with a zinc‑plated coating, this 4‑inch bolt delivers exceptional corrosion resistance and strength. The square head provides a secure grip for tools, while the right‑hand thread ensures reliable engagement. With a Grade 5 hardness rating, the bolt withstands heavy loads and repeated use without deformation. The included 24‑inch chain offers ample reach for a variety of door configurations, and the surface and angle strike plates add extra protection against forced entry.

Usage

Designed for versatility, this chain bolt excels on cabinet doors, double‑screen doors, garage doors, and industrial entryways. Whether securing a workshop storage cabinet, a residential garage, or a commercial loading dock, the bolt’s robust construction handles the stresses of daily operation. The reversible square bolt allows installation on doors that open in either direction, making it adaptable to unique architectural requirements. Its weather‑guarded finish ensures reliable performance in outdoor settings, resisting rain, humidity, and temperature fluctuations.

Why Choose Us

National Hardware is a trusted name in industrial fasteners, and the N236-336 chain bolt reflects the brand’s commitment to quality and durability. Each bolt undergoes rigorous testing to meet heavy‑duty standards, guaranteeing consistent performance across a wide range of applications. The zinc‑plated finish not only enhances aesthetic appeal but also extends the product’s lifespan by protecting against rust and wear. Our dedicated customer support team is available to assist with installation guidance, product specifications, and after‑sales service, ensuring you receive the best possible experience from purchase to long‑term use.

Key Features

• Heavy‑duty zinc‑plated steel construction resists corrosion and wear.
• Square head design provides easy tool access and secure tightening.
• Full 24‑inch chain offers flexible reach for various door sizes.
• Surface and angle strike plates add extra protection against forced entry.
• Responsive customer support and warranty coverage for peace of mind.

FAQ

What size door is the 4‑inch chain bolt suitable for?

The 4‑inch bolt is ideal for doors up to 4 inches thick, including most cabinet, garage, and industrial doors. The 24‑inch chain provides additional reach for larger door frames.

Can the bolt be installed on doors that open both inward and outward?

Yes. The square head can be reversed, allowing the bolt to function on doors that swing in either direction, making it a versatile choice for many installations.

Is the zinc plating sufficient for outdoor use?

The zinc‑plated finish, combined with the weather guard, offers strong protection against rain, humidity, and temperature changes, making the bolt suitable for outdoor applications.

What is the recommended torque for installing the bolt?

Apply a torque of 15–20 Nm to ensure the bolt is securely fastened without over‑tightening, which could damage the threads.

Do you provide installation instructions?

Yes. Detailed installation guidelines are included with the product, and our support team can provide additional assistance if needed.