Starrett Little Giant Jack Screw Set Complete with All Attachments - Ideal for General Use in Toolrooms or Machine Shops - 1-1/2-2-1/4" Range, 1" Base Diameter - S191

The Starrett Little Giant Jack Screws are used for leveling work on planer beds, drills, setting up machinery, and general use in toolrooms or machine shops. 191 Series are 1-1/2" to 2-1/4" / 38-57mm in Size. Series 190 and 191 have 20-pitch screws and for those who desire a finer adjustment, the F190 has a 40-pitch screw. An auxiliary pointed screw is supplied, to be used in place of the screw with swivel cap. Another Extension base is furnished for places where it is not possible to obtain a bearing on a flat surface. Extension V base is for use against a cylindrical form. Jack screws support work pieces. The jack screws create mechanical advantage by translating rotational motion into linear motion via a screw. Oftentimes a work piece may be held with a vise for example, but due to the extended nature of the part protrudes beyond the vise jaws, support is needed. create a scenario where the work piece is unsupported, causing unwanted momentum, distortion, and if the extended are is to be machined - the dimensional success of the operations can be impacted. The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments and Saw Blades for industrial, professional and consumer markets worldwide.

• Best Performance - Little Giant Jack Screws are used for leveling work on planer beds, drills, setting up machinery, and general use in toolrooms or machine shops.
• Easy to Use - Incorporating convenience and excellence, Starrett tools are designed to be user-friendly. Whether you're an experienced professional or an amateur when it comes to home improvement, our tools are handy and accessible.
• Quality Assurance - Starrett tools are made with the highest standards of quality and workmanship, providing fine precision tools for industrial, professional and consumer markets worldwide.
• The Perfect Accessory - Used in a wide variety of industries as an essential part of metalworking and woodworking, Starrett tools can be used in various applications and offers unparalleled service with execution like no other.
• The Standard for Excellence - Proudly made in the USA, Starrett combines over 140 years of American heritage and innovation with globally sourced materials to deliver exceptional quality tools and products.