Applications/ Advantages Has greater tensile strength than Class 4.6, 4.8 and 5.8 bolts. Concerning the dissemination of the screws and wrenches, Hallowell said that "the transition from a square head 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 the mechanics and machine manufacturers than any other single event that happened. 4-48. Usually the length of the key increases with the size of the socket, but not necessarily in direct proportion. C Hex Width Across Corners Max. ISO Hardware Engineering Data | ANSI Hardware Engineering Data. Socket Head Cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. The tool is cheap to manufacture, so it can be included with products requiring end-user assembly. The chart below provides information regarding metric bolts sizes and dimensions. FREE Delivery on your first order shipped by Amazon. This account from Hallowell does not mention the Allen patent of 1910, nor the Allen safety set screw product line. Grade-A bolts are the preferred style for most applications. M. v. Hohenhau, Learn how and when to remove this template message, "MARYLAND METRICS - TECHNICAL INFORMATION and DATA - Hexagon sockets (DIN 912, ISO 4762, DIN 6912, DIN 7984, DIN 7991, DIN 913, 914/5/6, ISO 4026, 4027/8/9, ISO 7379, ISO 7380, K 323)", One Good Turn: A Natural History of the Screwdriver and the Screw, Hex Keys (Allen Keys) and Bits Sockets Dimensions, https://en.wikipedia.org/w/index.php?title=Hex_key&oldid=999690637, Short description is different from Wikidata, Articles needing additional references from January 2015, All articles needing additional references, Articles with unsourced statements from January 2018, Articles needing additional references from September 2020, Creative Commons Attribution-ShareAlike License. From this came the Unbrako line of products. Search. NOM. Thread Size; 0-80: 1-64. Contact us today! Hallowell said that acceptance of the internal-wrenching hexagon drive was slow at first (painfully slow for SPS's sales), but that it eventually caught on quite strongly. The tool is usually held and twisted by the long arm, creating a large torque at the tip of the short arm. The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of Hartford, Connecticut circa 1910, and currently owned by Apex Tool Group, LLC. "[10] (These transitional growing pains echo those experienced many decades later with the adoption of the Torx drive). All dimensions are in millimeters. Customer service | Home > Heavy Hex Bolt Dimensions. Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use. 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. Hallowell does describe, however, the same inspiration also mentioned in connection with Allen for a wave of adoption of the hex socket head, beginning with set screws and followed by cap screws. [4] Although it is unlikely that Allen was the first person to think of a hex socket drive, his patent for a manufacturing method and his realized product appear to be the first. INBUS IP GmbH was registered with the stated purpose of holding and licensing the trademark INBUS. The scant documentation available indicates that the idea of a hex socket screw drive was probably conceived as early as the 1860s to the 1890s, but that such screws were probably not manufactured until around 1910. Min. [2] In Italy, it is known as brugola, for the company Officine Egidio Brugola (established 1926). Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. S Length Of Short Arm Max. The standard generic name used in catalogues and published books and journals is "hex key". Min. Illustration of safe hex key sizes (left and right) for a given hex head screw (middle), a constraint satisfied by metric 1st choice key sizes. Besides, the 12.9 Grade Allen Bolt is available in the market with either in zinc or chrome plating with the diameter size of the Class 12.9 Hex Bolt ranging from M5 to M160. A tool with a size too small will then simply spin freely inside the larger sized screw head. Because this is approximately the same as the Major or Thread diameter the thread diameter measurement can be used for fully threaded bolts. The contact surfaces of the screw or bolt are protected from external damage. Using a bolt with the right sizes is vital for jobs in various machinery and equipment. Some hex keys have a ball on one end, which allows the tool to be used at an angle off-axis to the screw. 5-40. 4.5 out of 5 stars 19. There are six contact surfaces between bolt and driver. Ideal in salt water and chlorine environments. A hex key (otherwise known as an Allen key) is required to fit these fasteners. For the American politician, see. [9] This adoption occurred first in tool and die work and later in other manufacturing fields such as defense (aircraft, tanks, submarines), civilian aircraft, automobiles, bicycles, furniture and others. Metric Stud Bolt To Nut Size Chart. A hex key or Allen key, is a simple tool used to drive bolts and screws with hexagonal sockets in their heads. Terms and conditions | The screw can be held by the key while it is inserted into its hole. FAQ; About; Contact; Resources; Menu. The torque applied to the screw is constrained by the length and thickness of the key. Hallowell said, "Up to this moment none of us had ever seen a socket head cap screw, and what I am about to relate concerns what I believe was the first socket head cap screw ever made in this country [the U.S.]. Purchase Metric Fasteners Today Allen Head Fasteners are also known as socket head fasteners. The tool can be reconditioned by grinding the worn-out end. "[7] Hallowell does not elaborate on why SPS found that the square hole "would not be acceptable in this country", but it seems likely that it would have to have involved licensing Robertson's patent, which would have defeated SPS's purpose of driving down its cost for internal-wrenching screws (and may have been unavailable at any price, as explained at "List of screw drives > Robertson"). 2020 popular 1 trends in Home Improvement, Tools, Computer & Office, Furniture with Allen Metric Bolts and 1. The tool is usually formed of a single piece of hexagonal rod of hard steel, with blunt ends that are meant to fit snugly into the screw's socket, bent in an "L" shape with unequal arms. 1st choice column shows some of the sizes which are most commonly found on hex screws with ISO metric threads (M-threads)[13] www.boltdepot.com • 2-56. These fasteners are said to have a "center pin reject" feature to prevent standard hex wrenches from working. SPS at the time was a prominent maker of shaft hangers and collars, the latter of which were set in place with set screws. I have designed it in a way that you can alter the Bolt diameter, Screw length and Thread pitch to obtain various sizes. A special driver must be used to fasten or remove these fasteners. For additional manufacturing and acceptance specification, reference should be made to ASME B18.2.3.6M-1979, R1989 standard. Activity; Punchout. Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose. The dimensions of this model can be vary according to standard metric Allen bolt parameters. Min. Also known as A-4 stainless, 316 is a highly corrosion resistant grade of stainless steel. Fabelhaft Werkzeug acquired the trademark from 3-48. Use the dimensions of your bolt to determine the appropriate size nut. £12.99 £ 12. 19 mm keys are so close to the same size as ¾" that they are completely interchangeable in practical use. Your Account "Allen key" redirects here. as "Inbus" in Germany (the term “INBUS” is a registered trademark, originally an acronym for Innensechskantschraube Bauer und Schaurte introduced in 1934 by the German company Bauer & Schaurte, in 2015 acquired by INBUS IP GmbH, Breckerfeld, Germany),[1] Drilled head … In his autobiography, the founder of the Standard Pressed Steel Company (SPS; now SPS Technologies, Inc.), Howard T. Hallowell Sr, presents a version of events[5] in which SPS developed a hex socket drive in-house, independently of Allen, circa 1911. Note that numerous other sizes are defined; these are the most common. Download Printable Version. The. Products. Allen Wrench Size; 6mm: 5mm x 0.8 : 9.75mm: 10mm: 4.5mm: 3mm: 8mm: 6mm x 1.0: 11.25mm: 13mm: 5.5mm: 4mm: 10mm: 8mm x 1.25: 13.25mm: 16mm: 7mm: 5mm: 12mm: 10mm x 1.5: 16.4mm: 18mm: 9mm: 6mm: 16mm: 12mm x 1.75: 18.4mm: 24mm: 11mm: 8mm: 20mm: 16mm x … There is another name in Italian (brugola), stemming from the name Officine Egidio Brugola, a company who first commercialized Allen's products in Italy. Metric hex keys are sorted in 1st choice sizes (which are most commonly used) and 2nd choice sizes (which are rarely used). It appears that the internal-wrenching hexagon drive may have been independently reinvented in various countries. Contact Us; Order. This means that it should not be possible to use a hex key with the wrong size, and thereby minimizing the risk of damaging either the screw head or the tool itself if the wrong tool should be used. About us | K Chamfer Max. Allen Socket Heads. Allen Button Heads. This is not true when mixing 1st and 2nd choice metric hex keys, or when mixing metric and inch-based hex keys, and as such these combinations do not constitute safe sizes. Then we decided to incorporate a hexagon socket into the screw […]. ISO DIN BS EN 4762 specifies the characteristics of hexagon socket head cap screws with coarse pitch thread from M1,6 up to and including M64 and product grade A. Grade-B bolts have looser tolerances and can be manufactured in a cold or hot-forging process. P. L. Robertson, of Milton, Ontario, Canada, first commercialized the square socket in 1908, having perfected and patented a suitable cold forming method, using the right material and the right die design. and as "Unbrako" key or wrench in Scandinavia (originally a Pennsylvania company established in 1911, in 2008 acquired by Deepak Fasteners Limited). 3-56. Set Screws Coarse + Fine . Fastener information DIA. An additional feature of the Grade 12.9 Metric Bolts is its special or improved fatigue-resistant MJ (UNJ) thread form, which meets the ANSI dimensions standard specifications. (Allen) Security hex ... or socket, e.g. Request a quote today! Because hex-style hardware and tools are available in both metric and Imperial and customary sizes (the latter sometimes labelled "SAE"), it is also possible to select a tool that is too small for the fastener by using an Imperial/customary tool on a metric fastener, or the converse. All dimensions are in millimeters. In 1909–1910, William G. Allen too patented a method of cold-forming screw heads around a hexagonal die (U.S. Patent 960,244). Shop the top 25 most popular 1 at the best prices! The Allen Key is inserted into a Hexagonal Socket within the screw or bolt. "M6", although this may be confused with the standard use of "M6" which refers to the thread size of a metric screw or bolt. Either end of the tool can be used to take advantage of reach or torque. Coarse Thread Bolts. If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted (e.g., M8). 99. 2nd choice sizes are rarely used. M12 Nut Dimensions: Pitch: 1.75 mm, s max: 18.00 mm, s min: 17.73 mm, e min: 20.03 mm, m max: 10.80 mm, m min: 10.37 mm. The story, if any, of whether SPS's methods required licensing of Allen's 1910 patent is not addressed by Hallowell's memoir. […] I am sure that the old-timers who read this book will remember this period vividly. Stainless steel 18-8 (A-2) Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use. For example, 4 mm keys are almost exactly the same size as 5/32", and 8 mm keys are almost exactly the same size as 5/16", which makes 4 mm and 8 mm preferred numbers for consumer products such as self-assembly furniture, because end users can successfully use an imperial key on a metric fastener, or vice versa, without stripping. VIGRUE Grub Screws Set 300pcs 304 Stainless Steel M2.5 M3 M4 M5 M6 M8 Hex Allen Head Socket Bolts, Metric Thread Socket Cup Point Assortment Kit with Internal Hex Drive and 6 Wrenches. The bolt chart provides both US and metric stud sizes. This cost problem drove SPS 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). The term "hex-head" is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional use referring to external-wrenching hexagons. Soon after SPS had begun producing the [hex] socket head set screw, Hallowell had the idea to make a [hex] socket head cap screw (SHCS). In this article, we’ll go through a complete guide of bolts, which involves bolts definition, types, dimensions explain, and the standard bolt sizes chart in metric … At the least, the design (or methods of manufacturing it) was patented in various countries by various patentees, and its name varies. These fasteners have a hexagonal socket in the head of the bolt. Metric Fasteners Hex, Head Cap Screws 12-1 Weights of Hex Head Cap Screws 12-2 Socket Cap Screws & Flat Head Socket Caps 12-3 Socket Set Screw & Button Socket Caps 12-4 Hex Nuts 12-5 Flatwashers 12-6 Internal & External Tooth Washers 12-7 to 12-8 Lockwashers 12-9 Miscellaneous/General Thread Length Measurement & Suggested Lengths & Torques for Common Flange Applications 13-1 Bolting & … Our selection of metric Allen bolts: 770 386- 5772/ 800 441- 9451 FAX 770 252- 6288 ISO Hardware Data... 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Or bolt are protected from external damage fasteners Today Allen head fasteners, exist from 1910 is! Patent would not have been independently reinvented in various countries for fully threaded bolts to! Are required and recessed-head screws the Shank diameter, expressed in millimetres for metric bolts sizes and dimensions bolt,! Our metric stud bolt to nut table is meant to help determine the correct size or! Into the screw can be used for fully threaded bolts Security hex... or socket, e.g too small then., Luxembourg, on 24 July 2015 heads around a hexagonal socket in the head of the increases... 800 441- 9451 FAX 770 252- 6288 ISO Hardware Engineering Data | Hardware! Table is meant to help determine the correct size bolt or nut for your purpose … ] sure that internal-wrenching... Has greater tensile strength than Class 4.6, 4.8 and 5.8 bolts different head shapes: countersunk panhead... Or simply a cap screw stud bolt to determine the appropriate size nut faq ; About ; contact ; ;!