Tel: 860-571-3602  |
Tel: 860-571-3602  |


Double digit growth since 2010 continues

Rob Nagy

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Hartford Technologies, Inc. 1022 Elm Street - Rocky Hill, CT 06067 Tel: 860-571-3602  |  Fax: 860-571-3604 Copyright © 2024. All rights reserved.

The 7 Steps Behind the Ball Manufacturing Process

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Putting the Function in Fun & Fitness

Balls, pins, rollers and bearing assemblies are used in a variety of recreational vehicles like ATVs and exercise products like treadmills & rowing machines.


Your Weapon of Mass Precision

Our high quality, precision products are used in military equipment such as tanks, weaponry, missile guidance systems, protective wear and a multitude of defense industry applications.


The Best Medical Components from Diagnosis to Recovery

Our surgical-grade precision specialty balls and components are used within a wide range of medical devices like IV therapy, hospital beds, and other life-saving diagnostic healthcare equipment.


Go With The Flow

Valves used in fire prevention equipment and natural gas transportation as well as linear slides are some of the precision industrial applications supplied by Hartford Technologies.


The Drive Behind the Hard Drive

Through the provision of brass balls, Hartford Technologies provides excellent conductivity solutions for electrical contact applications within the electronics industry.

2/3 of All Vehicles in the US Use Hartford Custom Bearing Assemblies

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Custom Bearing Project Uses Value-Added Engineering to Deliver High Product Strength at Lower Cost

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Custom Bearing Project Uses High-Value Engineering To Meet Customer Price Objective

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Hartford Technologies Launches New Assembly Program

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Edison He

Peter Hawley

Request Free Value Analysis

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Consumer Goods

Cutting Edge Solutions

Hartford Technologies supplies to a wide variety of manufacturers in the consumer goods industry for products such as health and beauty aids, small engine transmissions, and even kitchen scissors!

Glossary of Terms

View our glossary to brush up on your knowledge of bearing industry terms.

Agriculture Profile

Custom Bearing Retainer Assembly Machinery from Hartford Technologies

Ultra Clean Parts Capabilities

Needle Roller Bearing Assembly Machine

Roller Gauging


Chicken or the egg?

It would be hard to get either without our stainless steel balls precisely controlling the flow of animal water dispensing devices for poultry farms.

Let's get the ball rolling.

Request a free consultation to show us your application drawings or components today. Get Started

Douglas Ericson

Joe Beltrami


Customized Bearing Assemblies that are Moving the Automotive Industry

With our products in ⅔ of North American vehicles, almost every driver enjoys the benefits of our products each day – without realizing it!

Rolling Elements

Rolling elements are either balls or rollers. Rollers offer higher load carrying capability (theoretically, a line of contact vs. point of contact for a ball).


Retainers are used to hold rolling elements (balls or rollers) in proper orientation so they do not all bunch together. Typically made from stamped metal or molded plastic.

Bearing Cages

Bearing cages, also known as bearing separators, are used to hold rolling elements (balls or rollers) in proper orientation so they do not all bunch together. Typically made from stamped metal or molded plastic.

Bearing Races

Bearing races, also known as bearing rings, are typically produced using high quality bearing grade chrome steel, which is valued for its superior mechanical properties (tensile strength, hardness, wear resistance).  Precision machining and grinding processes are used to fabricate these components, which must withstand high speeds and loads during operation.


“Shaft” is typically used to describe the long narrow portion of a more complex cylindrical component or even a cylindrical part that been turned or machined.  Some customers use the term shaft to describe even basic parts that most people would label as pins or rollers.


“Needle” or “needle roller” implies that the length is significantly longer than the diameter.  The part is acting as a rolling element.


“Dowel” is often used in conjunction with “pin” and is often used as a detent or to closely align or support parts.  A detent is used to prevent or resist movement until it is released.


“Roller” implies that the part moves (rolls) when in use.  Generally a roller is acting as a bearing, supporting a load along its outer diameter.


“Pin” is generally used to describe a mechanical component that acts as a fastener to join other parts together in an assembly.  A pin may act as a pivot, hinge, jig, fixture or shaft.  A jig is typically used to hold a work piece in place and/or guide a tool operating on the device.  A pin is often used to locate or hold parts.  Some pins are headed; others are not.

DIN 5401

A ball standard commonly used in Europe.

ABMA Standard 10

A ball standard, formerly known as AFBMA, commonly used in the USA.

ISO 3290

A ball standard, recognized around the world.

Grade 1000 Balls

Grade 1000 balls are used in applications where balls produced from the finest steel are needed but wider tolerances are permissible.

Grade 100 and 200 Balls

Grades 100 and 200 balls are suitable for commercial ball bearings, heavy duty conveyors, lawn mowers, etc., where high quality steel is needed but where the accuracy of Grade 25 is not essential.

Grade 25 Balls

Grade 25 balls are usually specified for precision ball bearings, accurate valve applications or quality purposes.

Grade 10 Balls

Grade 10 Balls are used where extreme high precision is required.

Diameter Tolerance Per Shipment

The maximum permissible deviation of any ball diameter in any shipment from the basic diameter ordered.

Diameter Tolerance Per Unit Container

The maximum permissible range of the average diameters of the largest and smallest ball within the unit container.

Surface Roughness

A measure of the average deviation of a surface from its ideal form.  There are many different roughness calculations; the most common is Ra, which is the arithmetic average of the deviations in profile height from the mean line representing the nominal surface, with all of these deviations expressed as positive numbers.  Roughness is typically measured in microinches (millionths of an inch) or microns.


Also known as roundness/Diameter Tolerance. The permissible difference between the largest and smallest diameter measurable on one ball.