Cap screws, nuts and a Depression-era pivot.

SK Tools began as a supplier of parts rather than tools. English Wikipedia and the collector history site Alloy Artifacts both say the business was founded in Chicago as the Sherman-Klove Company by Mason H. Sherman and Noah Grover Klove, and that it started out making screw-machine products. Alloy Artifacts lists those early products as cap screws and nuts, and reproduces an April 1917 advertisement in the Automobile Trade Directory offering S.A.E. cap screws, plain nuts and castle nuts.

The founding date depends on the source. In its July 2021 acquisition announcement, the company said SK was founded in 1914, and Alloy Artifacts notes that a timeline from Berland’s Tools gives the same year. The same site also cites a 1916 biennial report from the State of Illinois that gives the company’s incorporation date as 31 August 1916. English Wikipedia says the company supplied munitions during the First World War, making mortar housings in a screw-machine plant on Harrison Street in Chicago.

Through the 1920s, according to English Wikipedia, Sherman-Klove worked mainly as a contract manufacturer, making tools for other brands, including Craftsman. Alloy Artifacts says Noah G. Klove had left the company by 1924, citing a notice in the Journal of the Society of Automotive Engineers, and that the 1930 Donnelley’s Industrial Directory still listed Sherman-Klove under “Screw Machine Products” rather than “Tools”. Wikipedia says Mason Sherman’s son, William S. Sherman, joined after college in 1927 and later became a major owner.

The move into branded tools came during the Depression. Both English Wikipedia and Alloy Artifacts, the latter drawing on the Berland’s Tools timeline, describe how the failure of Hinsdale, a customer for whom Sherman-Klove made socket wrenches, left the company holding a large inventory. Sherman-Klove reworked the product and began selling tools under its own initials. Alloy Artifacts dates the new S-K Tools division to 1932.

That is also where the brand’s first mark appears. According to Alloy Artifacts, the company filed a trademark application in 1933 for a logo with “S-K Tools” set inside a diamond, giving December 1932 as the date of first use, and the S-K diamond was often fixed to socket sets as a decal or a metal plate. English Wikipedia notes that the name was styled “S-K” in earlier years and is now usually written “SK”.

Ratchets, conglomerates and a new owner in 2021.

The ratchet is the product most closely tied to the name. A United States patent for a ratchet wrench, filed by Theodore O. Rueb on 7 December 1933 and granted on 20 November 1934, was assigned to the Sherman Klove Company. English Wikipedia describes Rueb as an engineer for the company and says his mechanism was used in a line of “round-head” ratchets ranging from 1/4-inch to 3/4-inch drive.

Ownership then changed several times. English Wikipedia says that in 1962 SK, together with its manufacturing partner Lectrolite Corporation of Defiance, Ohio, was bought by Symington-Wayne and became S-K Wayne. In 1968, it says, S-K Wayne passed to Dresser Industries through Dresser’s merger with Symington-Wayne’s business, and Dresser later dropped the cross-hatch pattern from the brand’s sockets as part of a modernisation. In 1985, according to the same article, SK became part of the French tool company Facom; Alloy Artifacts also indexes the 1985 Facom acquisition.

The next two decades brought independence and then a new parent. English Wikipedia says the business was bought by its management in 2005 and operated as the S-K Hand Tools Corporation. The tool blog ToolGuyd reported on 29 June 2010 that the company had filed for bankruptcy, and Crain’s Chicago Business reported on 23 August 2010 that SK’s assets were being sold to Ideal Industries, which announced the purchase in a press release the same day.

The current owner arrived in 2021. In a press release dated July 2021, SK announced that Hangzhou GreatStar Industrial Co., Ltd. had completed its acquisition of SK Hand Tools, including its patents and designs. The release described SK as operating a production facility outside Chicago, and English Wikipedia places the company in Sycamore, Illinois, with further manufacturing in China, Taiwan and the United States. GreatStar, the release said, was established in 1993; Wikipedia adds that GreatStar also owns the Shop-Vac, Arrow Fastener and Pony Jorgensen brands.

The 2021 announcement pointed to the X-Frame ratcheting wrench as one of SK’s featured products, and listed wrenches, ratchets, impact tools, sockets and screwdrivers among the range, alongside automotive-specific hand tools. The company named industrial supply, automotive repair and hardware as its main markets.

Design and documentation.

The brands in this group are all names stamped on mechanics’ and hardware-store tools: wrenches, ratchets, sockets, screwdrivers and the chests that hold them. Tool brands in general sit at many different points in the trade, from companies that sell from a van parked outside a garage to names that belong to a retailer and appear only on its own shelves, and a single name can be sold to professionals and home workshops at the same time.

A tool brand’s identity is usually carried less by one product than by a name forged or stamped into steel, a colour on a toolbox, a logo on a truck and the look of a catalogue. The company behind that name may have been sold, merged or renamed, and the place where the tools are made may have moved more than once. That makes the questions behind each name worth asking plainly: who started it, who owns it now, and where its tools are actually made.

Each guide separates what independent sources record from what the company says about itself — its founding story, its owners over time, where its tools are made and how its marks have changed — and marks plainly what rests only on the company’s own word.

Two initials in a diamond.

The SK identity has always been built on initials. The founders’ surnames, Sherman and Klove, were reduced to S-K when the tool division began in 1932, and according to Alloy Artifacts those letters were set inside a diamond for the earliest trademark. The hyphen dropped away over time, English Wikipedia says, leaving the shorter “SK” used today.

That compact mark travelled a long way. It sat on socket sets as a decal or a small metal plate in the 1930s, survived the years when the business traded as S-K Wayne, and stayed on the tools through ownership by Dresser, Facom, a management team, Ideal Industries and GreatStar. Each owner kept the initials rather than replacing them with its own name.

The product itself carried part of the identity too. English Wikipedia records that Dresser removed the cross-hatch pattern from SK sockets in order to modernise them. For collectors, Alloy Artifacts uses features such as these markings and logos to help date individual tools.

The brand’s history also overlaps with names that are better known to shoppers. In the 1920s, according to English Wikipedia, Sherman-Klove made tools for Craftsman, and Alloy Artifacts devotes a section to its contract production for that brand. From 1985, SK sat inside the French group Facom, which put an American mechanics’ brand alongside a European one for two decades.

For a design guide, SK Tools shows how a pair of founders’ initials, fixed early in a simple geometric frame, can outlast a long sequence of owners. Compare Facom, the French tool company that owned SK from 1985, and Craftsman, a brand for which Sherman-Klove made tools in the 1920s. For this guide we use a deep red, a chrome grey and a near-black with a condensed sans-serif, an unofficial interpretation; no product or logo is reproduced.

Keep SK Tools’s identity on hand — save it to a board in the Made Good inspiration library.