Bolt head markings and what they mean wilsongarner company. Grade identification markings for nuts specification. This technical information is supplied as a courtesy. Hex bolts, or hex cap screws, are used in machinery and construction. Bolt head markings ansi standards code issues engtips. Use this handy chart, courtesy, to get the name right the first time. Hex bolt identification, markings and strength chart table guide.
Mga universal tech bolt head markings and strength standards. Bolts longer than 6 shall have 6 of full form threads. Grade identification markings for popular grades of carbon steel externally threaded fasteners. These items include such hardware as rivets, fasteners, bolts, nuts, screws, washers, cables, guides, and. Not that the guys at the hardware store dont need a chuckle every now and them. Mechanical properties proof load psi yield strength min psi tensile strength min psi no grade mark sae j429grade 1 bolts, screws, studs low or medium carbon steel 14 thru 112 33,000. Description this section contains information on the correct usage and identification of bolts, flat washers, lock washers, nuts, lock nuts, fittings and torque data. Critical application fasteners since its formation in 1929, holokrome has been at the forefront of fastener development and innovation. Used in many structural applications, their shear and tensile strengths equal or exceed the requirements of an and nas bolts. Hex bolt identification, markings and strength chart table. Aircraft and military ms and nas part identification guide.
I am putting head markings on my cad library of bolts, since we use both grades, as well as grade 2. Bolts hex cap screws finished hex bolts 31 wrench openings for square and hex bolts and screws 32 to 33 heavy hex bolts 34 heavy hex structural bolts 35 highstrength structural bolting 36 carriage bolts and lag bolts 37 square bolts 38 step bolts and countersunk head elevator bolts 39 nuts finished and heavy hex nuts 41. The dimensional requirements are contained in ansi b18. In the sae spec, it only shows the marking pattern. At one time or another, all of us even the pros misidentify a fastener. Contact american fastener with any questions or for a custom quote. Usually fastener standards specify two types of marks to be on the head of a bolt. North american mfg identification markings electronic fasteners. I am not talking about the lines on the heads of bolts that indicate what grade the fastener is. Grade b8t, bolts, screws, studs for hightemperature service, aisi 321, 14 and larger.
Allen bolts usually exceed strength capacity of hexagonal bolts. Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or medium carbon. Bolts can be identified by the marking s located on the head of each bolt. In addition to these markings, the head will often have a manufacturer stamp. Some bolts share identical head identification and have significantly different strengths. If you have a question, concern or comment, feel free to contact us. We have the charts to help you identify the many different types of bolts and screws for just about any project. Additonal information on bolts is located at the bottom of the webpage. Lock bolt fasteners are designed to meet highstrength requirements. Bolt grade markings and strength chart mechanical properties head marking grade and material nominal size range inch mm proof load psi mpa min. Tensile strength psi mpa us bolts no markings grade 2 low or medium carbon steel 14 thru 34.
Head marking head mariing taptlte products camcar division of textron inc 826 east madison street belvidere, il 00 00 head marking torx products camcar division of textron inc formerly. Astm a 193 grade b8m class 1 regular series and heavy series x 67610 b 8 m symbol for identification of grade, i. Mechanical properties for steel hex bolts astm, sae and iso grade head markings and 60,000 14 thru 112 low carbon steel 14 thru 4 33,000 36,000 nominal identification specification fastener material size proof yield tensile. Should you find any errors omissions broken links, please let us know feedback. Appearing on the head of a bolt, it would look something like this. The following are to links of aircraft and military ms and nas part identification resources, tools, articles and other useful data. Free bolt size charts screw charts nut size charts all charts are downloadable and printable pdf formats great online mechanics tools for metric and us. The astm requires structural bolts to be distinctively marked. Identification grade mark specification fastener description material nominal size range in. Cheat guide chart bolts, screws, washers, nuts, drive. These bolt head markings include the manufacturers mark, the grade of bolt ex. In 1987, head marking requirements changed from requiring no grade identification to requiring a 307a marking on the head in addition to the manufacturers identification. The nuts, bolts, and washers used on the airplane are in. Identifying bolt grades and head markings for us grades 2, 5 and 8.
The heads of steel bolts are marked to identify their grade. The grade mark is a standardized mark that identifies the material properties that the fastener meets. Bolt head markings include manufacturers identity symbols. This is the organization that accepts the responsibility that the fastener meets specified requirements. Po box 607 rochester, in 46975 nut marking under head product trademark markings external o r octss camtech industries, inc. Construction bolt head identification markings guide. Patent and trademark office fastener insignia register active insignias oct 30, 2014 status. All holokrome products are made in the usa and used in a wide variety of market application which demand highquality, highstrength precision components. Fastenerdata head markings fastener specifications. Download a complimentary pdf of our fastener markings chart. Sae j429 grade 2 sae j429 grade 5 sae j429 grade 8 l9 astm a307 grade a. Hex bolt identification, markings and strength chart. Proof load the amount of tensile pull apart stress that a bolt must be able to withstand without permanent deformation yield strength the amount of tensile stress at which a specific permanent deformation will take place tensile strength the maximum amount of tensile stress that can take place before a bolt breaks or. These nut and bolt charts can help you do just that.
The hex head aircraft bolt an3 through an20 is an allpurpose structural bolt used for general applications involving tension or shear loads where a light drive fit is permissible 0. Department of energy health, safety and security office of corporate safety analysis this training document is in the process of being revised by the office of analysis hs24 through a partnership with the energy facility contractors group. The type of mark depends on the standard to which the bolt was manufactured. Mudge fasteners wants to help you identify what these head markings are and when youll need to know them. Technical specifications guide for fasteners fastrite. Grade a325 carbon or alloy steel with or without boron. Ajax fastener hand book issue99 pdf 2000 west coast fasteners.
As an example of a manufacturer head marking, the unique identifier for wilsongarner is the letter combination wg. Click here to view pdf version includes more information. Astm, sae and iso grade markings for steel fasteners. Grade 2 astma307 saej429 call us for specifications. In addition to the mandatory markings, certain manufacturers may include additional markings to distinguish them from others. There comes a time when every mechanic could use a quicker way to help measure their nuts and bolts. The heads of different fasteners can be stamped with a wide variety of markings onto the head. Cheat guide chart bolts, screws, washers, nuts, drive charts working on a project and trying to find the name of a special bolt type. Marking astm a563 grade 0 carbon steel 14 112 69,000 52,000 b55 c32 astm a563 grade a carbon steel 14 112 90,000 68,000 b68 c32.
A270 stainless steel bolts manufacturer a270 bolts price. Simply click the little pdf symbol next to the latest revision, and youll be able to view the document for free. The manufacturers mark is a symbol identifying the manufacturer or importer. Bolt dimensions metric grade markings torque values applications engine 163224 cc 270459 cc name size torque value size torque value nm ftlb nm ftlb connecting rod bolt m7 12 9 m8 18 cylinder head bolt m8 24 18 m10 39 29 flywheel nut m14 75 55 m16 115 85 crankcase cover. Grade identification markings for nuts specification material nominal proof load grade size stress zinc identification inches plain psi coated min. Astm, sae and iso grade markings for steel fasteners american. Bolt head markings and indentification aft fasteners. The strength and type of steel used in a bolt is supposed to be indicated by a raised mark on the head of the bolt. Aircraft hardware threaded fasteners part two bolts. Bolt grade markings grade radial bolt markings material nominal size diameterinches proof load psi tensile strength minimum psi ymarield strength minimum psi grade 2 no radial lines low or medium carbon steel 14 to 34 55,000 74,000 57,000 over 34 thru 1 12 33,000 60,000 36,000 grade 5 3 radial lines medium carbon steel 14 to 1.
110 711 278 635 99 41 1369 428 190 211 1512 1111 1323 995 231 413 658 25 712 994 432 666 1019 1193 1284 56 1466 1298 1362 272 431 1500 846 104 1346 1165 1217 566 650 308 975 926 814 675 1478