New Omniball Spring-Loaded Contact Features Barb and Knurl Press-fit

Press Release Summary:

  • Rolling ball interface feature enables mating components to engage in lateral, rotational and angular alignments
  • Includes .030” (.762 mm) maximum stroke; gold plating on all components and a .091” diameter ball interface
  • Tested to 1,000,000 compression cycles and rolled over 67 miles (108 km) at half stroke

Original Press Release:

Mill-Max Adds New Omniball™ Spring-Loaded Contact Options

Through-bole and solder-cup styles now offered in spring-loaded pins with rolling ball interface

Oyster Bay, NY, 20 October 2020 - Mill-Max Manufacturing Corp., Inc. announces new additions to its Omniball™ spring-loaded contact product line with solder tail and solder-cup versions, offering options for different termination requirements. The unique Omniball™ spring-loaded contact (patent pending) features a rolling ball interface, enabling mating components to engage in lateral, rotational and angular alignments while providing optimal electrical, mechanical, and structural reliability.

Joining the original surface mount style Omniball™ contacts are through-hole mount and solder-cup termination styles. There are two new through-hole mount contacts featuring different tail lengths, making them suitable for use on PCB's of various thickness. P/N: 7945-1-15-20-09-14-11-0 has a tail length of .079" (2 mm) while 7945-2-15-20-09-14-11-0 has a .118" (3 mm) long tail. The solder-cup version, P/N: 7949-0-15-20-09-14-11-0, is designed to accept wire sizes up to 20 AWG. It has two press-fit features, a barb, and a knurl, allowing the pin to be pressed in from either direction. The knurl, an anti-rotation press-fit feature, is preferred when maintaining solder-cup alignment is critical.

Omniball™ contacts are spring-loaded pins in which the traditional plunger has been replaced by a gold plated, brass ball. They are designed to simplify and improve the connections made between components which are mated together in a sliding or rotational motion rather than in an axial or vertical orientation. When engaged, the ball compresses and rolls, allowing the mating surfaces to make contact and then easily slide parallel to each other while spring force acts to ensure consistent electrical contact is maintained. This rolling action alleviates the concerns of connector damage such as binding, premature wearing and structural failure that may occur when using traditional plunger style spring pins in these types of applications.

Features of Omniball™ contacts include: .030" (.762 mm) maximum stroke; gold plating on all components and a .091" diameter ball interface. These spring-loaded pins are durable, they have been tested to 1,000,000 compression cycles and rolled over 67 miles (108 km) at half stroke while still meeting specifications for contact resistance of 20m-ohms max., current rating of 5.5 amps @ 30*C temperature rise and spring force of 55 grams at mid stroke (.015", .381 mm).

Omniball™" contacts are an excellent choice for any application that involves sliding or rotating connections, such as: "twist & lock" cable connectors; smart lens camera connectors; rugged and IP rated connectors including quarter turn and threaded; as well as docking stations, quick connects and blind mating applications.

Contact our technical services staff to discuss your application and how we may be able to address your needs.

For more information, please visit

About Mill-Max

Mill-Max is the leading US manufacturer of machined interconnect components with a vertically integrated manufacturing facility headquartered at 190 Pine Hollo;1.1 Rd. Oyster Bay. NV 11771. Its full product line includes spring-loaded connectors, SIP, DIP, PGA and BGA sockets, board-to-board interconnects and pin headers, surface mount and custom products, PCB pins and receptacles, solder terminals, wrapost receptacles and terminals. The company's complete manufacturing facility includes engineering, tooling, primary and secondary machining, stamping, plating, injection molding, and assembly.

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