ASME/ANSI B18.2.2 Slotted Nuts Industrial Fastening Solutions for Structural Connections

Reliable Mechanical Locking Solutions for High-Vibration Industrial Applications

In industrial machinery and structural assemblies, preventing fasteners from loosening under vibration, shock, and dynamic loads is a critical engineering challenge.

ASME/ANSI B18.2.2 Slotted Nuts, also known as Hex Slotted Nuts or Castellated Nuts, provide a reliable mechanical locking solution by combining traditional threaded fastening with cotter pin locking technology.

Unlike standard hex nuts, slotted nuts include precision-machined slots on the top surface, allowing a cotter pin or locking wire to pass through the nut and bolt assembly. This design prevents unwanted rotation and improves connection safety in demanding applications.

Juxin Fasteners manufactures and supplies ANSI B18.2.2 Slotted Nuts, DIN 935 Slotted Nuts, DIN 937 Low Slotted Nuts, and custom castellated nuts for global OEM customers.

For technical drawings, samples, and customized solutions:

Email: info@juxinfasteners.com
Website: www.juxinfasteners.com

What Are ASME/ANSI B18.2.2 Slotted Nuts?

A Slotted Nut is a specially designed hexagonal nut with machined slots on one end.

The slots allow a locking component, typically a cotter pin, to pass through the nut and the drilled hole in the bolt or threaded shaft.

The locking system prevents the nut from rotating during operation.

Common names include:

• Slotted Nuts

• Hex Slotted Nuts

• Castellated Nuts

• Castle Nuts

• Cotter Pin Lock Nuts

• Slotted Hex Nuts

These fasteners are widely used where mechanical reliability and easy maintenance are required.

How Do Slotted Nuts Work?

The working principle of a slotted nut is based on a combination of:

• Thread engagement

• Proper tightening torque

• Mechanical locking through cotter pins

The installation process includes:

1. Thread Installation

The slotted nut is installed onto a threaded bolt or shaft and tightened according to the required torque specification.

2. Slot Alignment

After tightening, one slot of the nut is aligned with the drilled hole through the bolt.

3. Cotter Pin Locking

A cotter pin is inserted through the aligned slot and bolt hole.

The pin prevents the nut from rotating, even under vibration or repeated movement.

This creates a positive mechanical locking system.

Slotted Nuts vs Standard Hex Nuts

Standard hex nuts depend mainly on thread friction to prevent loosening.

However, in applications with:

• Vibration

• Shock loading

• Rotating components

• Continuous movement

additional locking methods may be required.

Slotted nuts provide a mechanical locking function, making them suitable for safety-critical assemblies.

Advantages include:

✔ Prevents accidental loosening
✔ Easy inspection of locking condition
✔ Simple installation and removal
✔ Reusable fastening solution
✔ Suitable for maintenance applications

DIN 935 Slotted Nuts and DIN 937 Castellated Nuts

Juxin Fasteners supplies slotted and castellated nuts according to international standards.

DIN 935 Slotted Hex Nuts

DIN 935 slotted nuts feature:

• Hexagonal body

• Machined slots on top

• Cotter pin locking capability

Typical applications:

• Machinery

• Automotive components

• Mechanical assemblies

DIN 937 Low Slotted Nuts

DIN 937 low slotted nuts provide a reduced height design.

Benefits:

• Space-saving structure

• Lightweight fastening

• Suitable for compact assemblies

Slotted Nuts Material Options

Material selection depends on application environment, load requirements, and corrosion conditions.

Carbon Steel Slotted Nuts

Suitable for:

• General machinery

• Dry environments

• Standard industrial applications

Available finishes:

• Plain finish

• Zinc plating

• Zinc coating

Stainless Steel Slotted Nuts

Stainless steel slotted nuts provide:

• Excellent corrosion resistance

• Long service life

• Good performance in harsh environments

Common grades:

• Stainless Steel 304

• Stainless Steel 316

• A2 Stainless Steel

• A4 Stainless Steel

Applications:

• Marine equipment

• Food processing machinery

• Outdoor structures

Brass Slotted Nuts

Brass slotted nuts are used where:

• Electrical conductivity

• Corrosion resistance

• Decorative appearance

are required.

Industrial Applications of Slotted Nuts

1. Automotive Industry

Slotted nuts are widely used in automotive applications where vibration resistance is essential.

Typical applications:

• Vehicle axles

• Suspension systems

• Steering components

• Chassis assemblies

The cotter pin locking system provides additional safety for critical vehicle components.

2. Machinery Manufacturing

Industrial machinery requires reliable fastening solutions for moving components.

Applications include:

• Bearings

• Gear assemblies

• Mechanical shafts

• Transmission systems

The removable locking design allows easier maintenance and replacement.

3. Construction and Structural Connections

Slotted nuts are used in structural assemblies requiring secure connections.

Applications:

• Steel structures

• Heavy equipment

• Structural frames

• Industrial platforms

4. Aerospace and Transportation Equipment

Because of their mechanical locking reliability, slotted nuts are used in:

• Aircraft mechanisms

• Transportation equipment

• High-vibration assemblies

5. Marine Applications

Marine environments require corrosion-resistant fastening solutions.

Stainless steel castellated nuts are commonly selected for:

• Ship components

• Marine equipment

• Offshore structures

How to Select the Correct Slotted Nut?

Choosing the correct slotted nut requires consideration of several engineering factors.

1. Thread Specification

Confirm:

• Thread diameter

• Thread pitch

• Metric or imperial standard

Common sizes:

Metric:

• M5

• M6

• M8

• M10

• M12

• M16

• M20

Imperial:

• 1/4-20

• 5/16-18

• 3/8-16

• 1/2-13

2. Material Selection

Select material according to:

• Temperature

• Corrosion environment

• Load requirement

• Service life expectation

3. Strength Grade

The nut strength must match the bolt strength.

Incorrect matching may cause:

• Thread stripping

• Connection failure

• Reduced safety

Slotted Nuts Installation Guidelines

Proper installation ensures maximum fastening performance.

Step 1: Prepare Components

Check:

• Bolt condition

• Thread cleanliness

• Correct nut specification

Step 2: Install the Slotted Nut

Thread the nut onto the bolt manually first.

Avoid cross-threading.

Step 3: Apply Correct Torque

Tighten according to engineering requirements.

Avoid:

• Under tightening

• Excessive torque

Step 4: Install Cotter Pin

Align the slot with the bolt hole.

Insert the cotter pin and bend the ends securely.

Custom Slotted Nuts Manufacturer for OEM Applications

Juxin Fasteners provides customized Slotted Nuts and Castellated Nut solutions for global manufacturers.

Our manufacturing capabilities include:

✔ ANSI B18.2.2 Slotted Nuts
✔ DIN 935 Slotted Nuts
✔ DIN 937 Castellated Nuts
✔ Metric and Imperial Threads
✔ Stainless Steel Slotted Nuts
✔ Carbon Steel Slotted Nuts
✔ Brass Slotted Nuts
✔ Custom dimensions according to drawings

We support:

• Prototype development

• Small batch production

• OEM mass production

• Engineering customization

Why Choose Juxin Fasteners?

As an experienced industrial fastener manufacturer, Juxin Fasteners provides reliable fastening solutions for automotive, machinery, energy equipment, and industrial OEM customers.

Our advantages:

• Professional fastener engineering support

• Customized manufacturing capability

• International standard production

• Stable quality control

• Global export experience

Get Your Slotted Nuts Solution from Juxin Fasteners

If you are searching for a reliable:

• Slotted Nuts Manufacturer

• Castellated Nuts Supplier

• ANSI B18.2.2 Nut Manufacturer

• DIN 935 Fastener Supplier

• Custom OEM Fastener Manufacturer

Juxin Fasteners can provide the right fastening solution for your application.

Contact our engineering team today.

Juxin Fasteners
Email: info@juxinfasteners.com
Website: www.juxinfasteners.com