Thinking that it had more headspace i didnt look any further. Steel 67623 b 8 x symbol for identification of grade, i. Grade identification markings for nuts specification material. Contact american fastener with any questions or for a custom quote. Standard bolt identification markings identification grade mark specification fastener description material nominal size range in. Bolt head markings and indentification aft fasteners. I am not talking about the lines on the heads of bolts that indicate what grade the fastener is. The dimensional requirements are contained in ansi b18. Oct 05, 2016 now that you have a basic understanding of bolt head markings there is no excuse for installing the wrong bolt just because it fits. The type of mark depends on the standard to which the bolt was manufactured. The markings provide optimum legibility and permanent identification. The regulations implementing the fastener quality act are set forth at 15 c. This head marking differentiates a teks select fastener from standard teks fasteners that can offer fewer features.
Pacific bolt takes pride in strengthening its existing partnerships and looks forward to developing new ones. North american mfg identification markings electronic fasteners. 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. The manufacturers mark is a symbol identifying the manufacturer or importer. When dissimilar metals for example, aluminum and steel are mechanically fas. This technical information is supplied as a courtesy. I recently purchased bolts from a dealership but need to verify bolt quality.
Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or medium carbon. The selfplugging rivet is made of 5056h14 aluminum alloy and includes the conical recess and locking collar in the rivet head. Besides, the head markings most reputable manufacturers also stamp their trademark in the bolt head so that it is readily identifiable and traceable. Head marking grade and material nominal size range inches mechanical properties. A gold color zinc plated bolt has 6 hash markings on the head this represents grade 8 which carry a tensile strength of 150,000 psi. Metric head markings bolt head markings part 3 wilsongarner. Grade 2 astma307 saej429 call us for specifications. Jump up bolt grade markings and strength chart, retrieved 20090529. Download a complimentary pdf of our fastener markings chart. Pull grooves that fit into the jaws of the rivet gun are provided on the stem end that protrudes above the rivet head. Description a onepiece bolt with a 24sided head and a flanged bearing surface, made of alloy steel. All standard parts sold with the grade 5 mark of three radial lines at 120 degrees apart must also bare a mark identifying the manu. 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.
Bolt head markings and what they mean wilsongarner company. If you have a question, concern or comment, feel free to contact us. Hexagon head precision metric high tensile hexagon head high strength structural hexagon head metric coach screws cup head bsw square neck cup head oval neck fishbolts cup head bsw square neck cup head oval neck fishbolts as 2451 as 11108. This bolt holds on the spinning part of a leaf shredder. Click here to view pdf version includes more information.
An example of this is sae j429 grade 5 bolts versus astm a574 for socket head cap screws. Does anyone know what the head markings a, aa, ec, etc. Grade a325 carbon or alloy steel with or without boron. On side note, i was sorting through a box of miscellaneous fasteners at work. 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.
Some bolts share identical head identification and have significantly different strengths. Bolt head markings include manufacturers identity symbols. Grade markings help you choose the right fastener for your project head markings on cap screws are your assurance that the fastener you choose will do the job its designed to do. Here we have a bolt head with the wilsongarner manufacturer mark and six radial lines. Does the marking le on the head of a hex head bolt mean. Determining bolt grade and head markings with northeast fasteners on. Product standards require the manufacturers head marking to appear on the top of all bolts 14 diameter and larger.
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. Amongst the socket head screws and washers, i found a hex head bolt with an a on the head. So many bolts are lost or get replaced by previous owners it is hard to know the difference. Sae j429 grade 2 sae j429 grade 5 sae j429 grade 8 l9 astm a307 grade a.
Thanks all question resolved le does not mean a lefthanded thread. Sae j429 grade 2 sae j429 grade 5 sae j429 grade 8 l9 astm a307 grade a astm a307 grade b astm a325 type 1 astm a490 type 1 astm a193 grade b7 din 931933 class 8. 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. Mga universal tech bolt head markings and strength standards. And that means, you are installing a fastener backed by customer service from a world class provider of fastening solutions. Weve already covered manufacturers head markings and fastener standards in part 1. Hex bolt identification, markings and strength chart.
They dont have the typical grade marks on the head like a metric bolt would 8. Identification markings are specified in the first column of tables i thru vii. Required markings astm a 193 grade b8 class 1 regular series and heavy series. The grade mark is a standardized mark that identifies the material properties that the fastener meets. I found this site that gives bolt markings and a lot more info. X represents one location such a marking may appear.
Identification markings for fasteners date of approval. This standardization handbook was developed by the. The rivet codes shown in figure 61 are sufficient to identify rivets only by head shape. A quick aside you may notice that in the images the wg mark has been moved around a bit to accommodate the grade markings. Grade identification markings for nuts specification material nominal proof load grade size stress zinc identification inches plain psi coated min. Besides, the head markings most reputable manufacturers also stamp their trademark in the bolt. Astm, sae and iso grade markings for steel fasteners. Mudge fasteners wants to help you identify what these head markings are and when youll need to know them. Description a onepiece bolt with a 24sided head and a flanged bearing surface, made. Proudly canadian, we work hard to provide all of our customers with bolts manufactured with the highest degree of quality. Cw 1 headed and rolled from annealed stock thus acquiring a degree of cold work.
If the bolt youd like to replace isnt marked, or you cant find one identical to it, youll need a service or parts manual to determine the grade. Usually fastener standards specify two types of marks to be on the head of a bolt. Hex bolt identification, markings and strength chart table guide. We followed that up with part 2, where we covered some common standards for inch series parts. Bolt head markings and grades machine, sheet metal, and thread cuttingthread formingthread rolling screws technical information anchors technical information and selection guide. Bolt head identification and torque specs bolthead markings. Construction bolt head identification markings guide. Allpro threaded neither employs nor maintains an engineering or technica l staff, and allpro is merely supplying certain. This permits higher torque to be applied with less. A wide variety of bolt head marking options are available to you, such as gb. In most cases, bolts used in machinery are made to sae standard j429, and bolts used in structural applications are made to astm standards.
Markings stamped over other markings are fairly common, and can confuse things a bit. Sae j429 grade 2 is a low carbon steel strength grade that has improved strength. There are 340 bolt head marking suppliers, mainly located in asia. A325, a490, and markings to classify the type of bolt type 1 or type 3. Bifi culbertson, horse industry handbook blaze star, stripe, and snip star and stripe coronet pastern sock half stocking outside outside inside stocking heel white heel heel extending. Refer details on the label for k factor and torque.
Bolt heads and fasteners in general are typically marked with the manufacturers identification and the material grade, so wherever there is a bolt marked hf you can rest assured it is a quality assured piece of british. Patent and trademark office fastener insignia register. The top countries of suppliers are india, china, and japan, from which the percentage of bolt head marking supply is 1%, 98%, and 1% respectively. Unless a torque wrench is used the tendency is to undertighten large bolts and overtighten small ones. The height of the markings is commensurate with the size of the fasteners being marked. Tensile strength psi no markings grade 2 low or medium carbon steel 14 through 34 55,000 57,000 74,000 over 34 through 112 33,000 36,000 60,000 3 radial lines grade 5 medium carbon steel, quenched and tempered. This is the organization that accepts the responsibility that the fastener meets specified. Many, but not all bolts, are stamped with either a number metric bolts or a series of lines fractional or american bolts indicating their minimum strength or, more technically, their property class. In part 3 of our series on head markings, were going to talk about metric fasteners. These bolt head markings include the manufacturers mark, the grade of bolt ex. The society of automotive engineers and the industrial fasteners institute have established specific ranges of hardness and tensile strength for each grade of fastener. There are 370 suppliers who sells bolt head marking on, mainly located in asia. This is the organization that accepts the responsibility that the fastener meets specified requirements. The top supplying country or region is china, which supply 100% of bolt head marking respectively.
In addition to the mandatory markings, certain manufacturers may include additional markings to distinguish them from others. As a rule, when a bolt is installed the nut over a washer should be turned and not the bolts head. Does the marking le on the head of a hex head bolt mean it has lefthand threads. Astm a 193 grade b8m class 1 regular series and heavy series x 67610 b 8 m symbol for identification of grade, i. Is there a list of 2a3a bolt head markings we can look for as original. Metric head markings bolt head markings part 3 wilson. The astm requires structural bolts to be distinctively marked. These radial lines indicate that the bolt is a grade 8 bolt. On june 8, 1999, legislation amending the fastener quality act 15 u. Additonal information on bolts is located at the bottom of the webpage. Does the marking le on the head of a hex head bolt mean it. A sdvosb service disabled veteran owned small business.
Hex bolt identification, markings and strength chart table. Patent and trademark office fastener insignia register active insignias oct 30, 2014 status. Some bolts share identical head identification and. Identification grade mark specification fastener description material nominal size range in. Head markings class and material nominal size rangemm proof load mpa min. Bifi culbertson, horse industry handbook blaze star, stripe, and snip star and stripe coronet pastern sock half stocking outside outside inside stocking heel white heel heel extending source. Head marking grade and material nominal size range inches mechanical properties proof load psi min. Figure 1 illustrates a typical stressstrain relationship of a bolt as a tension load is applied. In addition to these markings, most reputable bolt manufacturers will also stamp their trademark in the head of the bolt, which allows for easy identification and accountability. Standard leg markings star stripe snip bald face source. A449 bolts and ued yes over l12 ts psi tin 90,000 marked on top of head 1 scuds carbon thru 3 dia prf load psi 58,000 for bolts and on end \ steel bhn 18323s for studs.
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