Atlas Foundry Company - logo  
Atlas Foundry home About Atlas Foundry Foundry glossary Site map Contact Atlas Foundry
Atlas Foundry Company - logo  
Atlas Foundry Company - Since 1893 Gray Iron Casting Services Foundry products Equipment Benefits Frequently asked questions (FAQs) Tips and facts Links
Foundry - photo
Foundry glossary
Call Atlas Foundry for Gray Iron Casting Services at 765-662-2525
ISO9001:2015 Certified

Find us on FaceBook
Follow Us on LinkedIN

Home > Glossary of Foundry Terms > J

Glossary of Foundry Terms - J

A | B | C | D | E | F | G | H | I | J | K | L | M
N | O | P | Q | R | S | T | U | V | W | XYZ


Symbol for a 1-gram equivalent weight.

Jack Arch

A spring arch, flat or horizontal on the underside.

Jacket, Mold

A wood or metal form slipped over a mold made in a snap or slip flask, to support the four sides of the mold during pouring. Jackets and mold weights are shifted from one row of molds to another during the pouring period. See Flask.


Usually an upright structural member forming the side of an opening in a refractory or furnace wall.

Jamb Brick

A brick modified so one corner is rounded.

Jar Ramming

Packing sand in a mold by raising and dropping on a table the sand, pattern, and flask. Jolt squeezers, jarring machines, and jolt rammers are machines using this principle. See Jolt Ramming, Jolt Squeezer Machine, Jolt Machine.

Jarring Machine

A molding machine that packs the sand by jarring. See Jar Ramming.

Jersey Fireclay Brick

Highly siliceous clay brick, semisilica brick.

Jet Scrubber

A high velocity water jet directed into the throat of a venture section of a cupola to separate out particulates in air pollution control.

Jet Tapping

A method of tapping a melting furnace by firing a small explosive charge instead of using an oxygen lance. The tapper consists of an explosive charge enclosed in a plastic case surrounded by a hollow bullet-shaped body.


Projecting part of crane from which lifting chain or gear is suspended.


A device arranged to expedite a hand or machine operation.


A mathematical expression used to characterize the fracture toughness of a material having appreciable plasticity prior to fracture. The J-integral eliminates the need to describe the behavior of the material near the crack tip. Units are MN/m or in in-lb/in 2.

Jobbing Foundry

A foundry engaged in the manufacture of numerous types of castings and is not a part of a manufacturing plant, and produces castings for sale that usually makes a wide variety of castings in small lots or quantities. See Casting, Foundry.

Joint Welding

Production welding used to weld cast components together to obtain an integral unit.


To raise the flask filled with sand and allow it to drop, thereby compacting the sand against the pattern. See Flask, Sand.

Jolt Machine

Molding machine which packs or rams the sand around the pattern by raising the table on which the flask, sand, and pattern are mounted a few inches and allowing the whole to drop suddenly. The table is raised pneumatically, and the operation is repeated until the desired sand density is reached.

Jolt Ramming

Packing sand in a mold by raising and dropping the sand, pattern, and flask on a table. Jolt squeezers, jarring machines, and jolt rammers are all machines that use this method.

Jolt Squeezer Machine

A combination machine that employs a jolt action followed by a squeezing action to compact the sand around the pattern. See Jar Ramming.

Jominy Test

See End-Quench Hardenability Test.


A | B | C | D | E | F | G | H | I | J | K | L | M
N | O | P | Q | R | S | T | U | V | W | XYZ

If you would more information about Atlas Foundry Company and the Gray Iron Castings and other services we provide, please call us at (765) 662-2525, fill out our contact form, or email Sales.

Services | Products | Equipment | Benefits | FAQs
Tips & Facts | Links | About Atlas Foundry | Foundry Glossary
Contact Atlas Foundry | Site Map | Back to Home

Atlas Foundry Company, Inc.
601 N. Henderson Avenue
Marion, IN 46952-3348
Telephone: (765) 662-2525 • Fax: (765) 662-2902
Email: Atlas Foundry • Sales: Email Sales