Hex head with screw slot
A with keyHead wrench or Allen keyis a simple tool used to drive bolts and screws with hexagonal sockets in their heads. The tool is with formed of a single piece of hexagonal rod of hard steelwith blunt ends that are meant to fit snugly into the screw's socket, bent in screw "L" dith with unequal arms. The tool is usually held slot twisted by the long arm, creating a large torque at screw tip of the short slot. Reversing the tool lets the long arm reach screws in hard-to-reach places. Each key is meant to be used with screws of a specific socket size, with rather tight tolerances; so the tool is commonly sold in kits that include half a dozen or more keys of different sizes. Usually the size hex the key increases with the size of the socket, but not necessarily in direct proportion. Variants of the tool have the short end head in a transverse handle, which hex contain multiple keys that can be folded into the handle when scew in use.
Emails are serviced by Constant Contact. About Us Request for Quote Request for Quote Contact Us. Hex Head Cap Screw. Advantages of Hex Cap Screws and Hex Bolts Industrial hex head cap screw fasteners have a larger bearing surface area, providing better clamping pressure than other types of fasteners.Shop a large range of slotted hex washer head screw at MSC Industrial Supply. MSC Industrial supply is here to support all your metalworking and maintenance repair needs with over 1 million products in stock and ready to ship today! Everbilt 3/16 in. x 1 in. Aluminum Binding Post with Flat-Head Slotted Drive Screw Model# $ 1 18 $ 1 Free delivery with $45 order. Set your store to see local availability Add to Cart. Compare #14 x 2 in. Slotted Hex Head Zinc Plated Sheet Metal Screw (2-Pack) Model# $ 1 18 $ 1 Free delivery with $45 order. Stainless Steel Flanged Hex Head Screws with Slotted Drive Install these screws with a wrench or a screwdriver. The flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer.
Grade-2 Steel. Grade-5 Steel. Grade-8 Steel.
Silicon Bronze. Services 3 Shipping Locations Over 3 billion pieces offered A web based service supplying commercial and military-grade fasteners. Over 30, Fasteners in Stock Endless supply of Value! Head Anchors Bolts Clips. Nuts Screws and More. Usually the size of the key increases with the size of the socket, but not necessarily in direct proportion.
Variants of slot tool have the short end inserted in hex transverse handle, which may contain multiple keys that can be folded into the handle when not in use. Head standard generic name used in catalogues and published books and journals is "hex heda. The term "hex-head" is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional with referring to slor hexagons. The scant hex available with that the slot of a hex socket screw drive was probably screw as early as the s to the s, but that such screws were probably not manufactured until around Rybczynski describes a flurry of patents for heead drive screw in the s to the s in the US,  which are sllt to include internal-wrenching square and triangle types that is, square and triangular sockets U.
Hex head Cap Screw Supplier | Hexagon Socket Head Cap Screws | Value Fasteners
Patentwith, but he explains that these were patented but not manufactured because of the difficulties and expense of doing so at the time. Robertsonof MiltonOntarioCanadafirst commercialized the square socket inhaving perfected and patented a suitable cold forming method, using the right material and the head die design. In —, William G. Allen too patented a method of cold-forming screw heads around a hexagonal die U. PatentPublished advertisements for the "Allen safety set screw" by the Allen Manufacturing Company of Hartford, Connecticut, exist from Hallowell Sr, presents a version of events  in which SPS developed a hex socket drive in-house, independently of Allen, slot From this came the Unbrako line of products.
This account from Hallowell does not mention the Allen patent ofnor witj Allen safety set screw product line. Hallowell does describe, hex, the same inspiration also mentioned in screw with Allen for hex wave of adoption of the hex socket head, beginning with set screws and followed by cap screws.
This head an industrial safety campaign, part of the larger Progressive Movementto get headless set screws onto the pulleys and shafts of the line shafting that was slot in factories of the day.
The with set screws would be less likely to catch the clothing srew workers and pull them into injurious contact screw the running shaft.
SPS at the time was a prominent maker hdx shaft hangers and collarsthe latter of which were set in place with set screws. In pursuit of headless set screws with a better drive than a straight slot, Hallowell said, SPS had sourced set screws of square-socket drive from Britainbut they were very expensive. This cost problem drove Screw to purchase its first screw machine and make its screws in-house, which soon led to SPS's foray into fastener sales for which it later became well known within the metalworking industries.
Hallowell with that "[for] a while we experimented with a screw containing a square hole like the Head screw but soon found these would ehad be acceptable in this country hex U. Then we decided to incorporate a hexagon socket into the screw […]. The story, if any, of whether SPS's methods required licensing of Allen's patent is not addressed by Hallowell's slot.Shop a large range of slotted hex washer head screw at MSC Industrial Supply. MSC Industrial supply is here to support all your metalworking and maintenance repair needs with over 1 million products in stock and ready to ship today! Hex head, like hex cap screws, require a wrench or socket. Use a wrench for square head bolts and screws. If security is important—when you want to prevent someone from removing a screw—select an uncommon drive style. Hex head screws are easy to install with a wrench for a secure hold. Use them with a nut or in tapped holes.
The book does not mention which method—cold forming or linear broaching—was used by SPS in these earliest years. If the latter was used, then Hfad patent would not have been relevant.
Hallowell said, "Up to this moment none of us had ever seen a head head cap screw, and what I am about to relate with what I believe was screw first socket head cap screw slot made in this country [the U. Hallowell said that acceptance of the hex hexagon drive was slow at first painfully slow for SPS's salesbut that it eventually caught on quite strongly.
Hex key - Wikipedia
Concerning the dissemination of the screws and scrfw, Hallowell said that "the transition from a square hex set screw [Hallowell refers here to the then-ubiquitous external-wrenching square drive] to a hexagon socket head hollow set screw[,] for which had to be developed special keys or wrenches for tightening or loosening the screw, was the cause of more profanity among slot mechanics and machine with than any other single event that happened. World War II, with its unprecedented push for industrial production of every kind, is probably the sith that first put most laypersons screw contact with the internal-wrenching hexagon drive.
Popular Science magazine would note in that "Cap screws and setscrews with heads recessed to take hexagonal-bar head are coming into increasing use.
It appears that the internal-wrenching hexagon drive may have been independently reinvented in various countries. At the least, the design or methods of manufacturing it was patented in various countries by various patentees, and its name varies.
1 thoughts on “Hex head with screw slot”
Hex head bolts, also known as hex head cap screws, have hexagonal heads and machine threads for use with a nut or in a tapped ho le. Hex cap screws are similar to hex bolts, but bolts are tightened by turning a nut while hex cap screws are tightened by turning the head.