Is there a list of 2a3a bolt head markings we can look for as original. Does the marking le on the head of a hex head bolt mean it has lefthand threads. Here we have a bolt head with the wilsongarner manufacturer mark and six radial lines. This bolt holds on the spinning part of a leaf shredder. The height of the markings is commensurate with the size of the fasteners being marked. Hex bolt identification, markings and strength chart. Download a complimentary pdf of our fastener markings chart. Does the marking le on the head of a hex head bolt mean. Bolt head identification and torque specs bolthead markings. This is the organization that accepts the responsibility that the fastener meets specified requirements. 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.
The top supplying country or region is china, which supply 100% of bolt head marking respectively. 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. Sae j429 grade 2 sae j429 grade 5 sae j429 grade 8 l9 astm a307 grade a. Besides, the head markings most reputable manufacturers also stamp their trademark in the bolt. Markings stamped over other markings are fairly common, and can confuse things a bit. Jul 09, 2009 determining bolt grade and head markings with northeast fasteners on. The type of mark depends on the standard to which the bolt was manufactured. 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. Mga universal tech bolt head markings and strength standards. In addition to the mandatory markings, certain manufacturers may include additional markings to distinguish them from others. Metric head markings bolt head markings part 3 wilson. This permits higher torque to be applied with less. Identification with the manufacturers mark and the property class is mandatory for hexagon screws 3. Required markings astm a 193 grade b8 class 1 regular series and heavy series.
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. In most cases, bolts used in machinery are made to sae standard j429, and bolts used in structural applications are made to astm standards. The grade mark is a standardized mark that identifies the material properties that the fastener meets. On side note, i was sorting through a box of miscellaneous fasteners at work. Besides, the head markings most reputable manufacturers also stamp their trademark in the bolt head so that it is readily identifiable and traceable. Product standards require the manufacturers head marking to appear on the top of all bolts 14 diameter and larger.
Bolt head markings and grades machine, sheet metal, and thread cuttingthread formingthread rolling screws technical information anchors technical information and selection guide. Hex bolt identification, markings and strength chart table guide. Description a onepiece bolt with a 24sided head and a flanged bearing surface, made of alloy steel. 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. 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. Standard bolt identification markings identification grade mark specification fastener description material nominal size range in. Astm, sae and iso grade markings for steel fasteners. Click here to view pdf version includes more information. A quick aside you may notice that in the images the wg mark has been moved around a bit to accommodate the grade markings. 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.
Figure 1 illustrates a typical stressstrain relationship of a bolt as a tension load is applied. Cw 1 headed and rolled from annealed stock thus acquiring a degree of cold work. We followed that up with part 2, where we covered some common standards for inch series parts. Bolt head markings and indentification aft fasteners. Grade identification markings for nuts specification material nominal proof load grade size stress zinc identification inches plain psi coated min. Standard leg markings star stripe snip bald face source. The astm requires structural bolts to be distinctively marked.
Grade identification markings for nuts specification material. Determining bolt grade and head markings with northeast fasteners on. The markings provide optimum legibility and permanent identification. Refer details on the label for k factor and torque. I found this site that gives bolt markings and a lot more info. When dissimilar metals for example, aluminum and steel are mechanically fas. 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. An example of this is sae j429 grade 5 bolts versus astm a574 for socket head cap screws.
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. So many bolts are lost or get replaced by previous owners it is hard to know the difference. Unless a torque wrench is used the tendency is to undertighten large bolts and overtighten small ones. X represents one location such a marking may appear. The regulations implementing the fastener quality act are set forth at 15 c. These bolt head markings include the manufacturers mark, the grade of bolt ex.
Hex bolt identification, markings and strength chart table. 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. 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. A325, a490, and markings to classify the type of bolt type 1 or type 3.
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. Does the marking le on the head of a hex head bolt mean it. Does anyone know what the head markings a, aa, ec, etc. If you have a question, concern or comment, feel free to contact us. And that means, you are installing a fastener backed by customer service from a world class provider of fastening solutions. Pull grooves that fit into the jaws of the rivet gun are provided on the stem end that protrudes above the rivet head. Construction bolt head identification markings guide. This head marking differentiates a teks select fastener from standard teks fasteners that can offer fewer features. Bolt head markings include manufacturers identity symbols. They dont have the typical grade marks on the head like a metric bolt would 8.
Head marking grade and material nominal size range inches mechanical properties proof load psi min. 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. Amongst the socket head screws and washers, i found a hex head bolt with an a on the head. Astm a 193 grade b8m class 1 regular series and heavy series x 67610 b 8 m symbol for identification of grade, i. The manufacturers mark is a symbol identifying the manufacturer or importer. 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. Description a onepiece bolt with a 24sided head and a flanged bearing surface, made. Identification markings for fasteners date of approval. Grade 2 astma307 saej429 call us for specifications. Thanks all question resolved le does not mean a lefthanded thread. Pacific bolt takes pride in strengthening its existing partnerships and looks forward to developing new ones. This is the organization that accepts the responsibility that the fastener meets specified.
Head markings class and material nominal size rangemm proof load mpa min. 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. Identification grade mark specification fastener description material nominal size range in. This technical information is supplied as a courtesy. Head marking grade and material nominal size range inches mechanical properties. Proudly canadian, we work hard to provide all of our customers with bolts manufactured with the highest degree of quality.
Contact american fastener with any questions or for a custom quote. Grade a325 carbon or alloy steel with or without boron. Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or medium carbon. I recently purchased bolts from a dealership but need to verify bolt quality. Bolt head markings and what they mean wilsongarner company. Additonal information on bolts is located at the bottom of the webpage. Jump up bolt grade markings and strength chart, retrieved 20090529. Allpro threaded neither employs nor maintains an engineering or technica l staff, and allpro is merely supplying certain. I am not talking about the lines on the heads of bolts that indicate what grade the fastener is.
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. The rivet codes shown in figure 61 are sufficient to identify rivets only by head shape. 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. Thinking that it had more headspace i didnt look any further. 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. A wide variety of bolt head marking options are available to you, such as gb. The dimensional requirements are contained in ansi b18. 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. Weve already covered manufacturers head markings and fastener standards in part 1. Some bolts share identical head identification and have significantly different strengths. The heads of different fasteners can be stamped with a wide variety of markings onto the head.
Grade identification markings for nuts specification. There are 340 bolt head marking suppliers, mainly located in asia. Identification markings are specified in the first column of tables i thru vii. This standardization handbook was developed by the. 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. Patent and trademark office fastener insignia register active insignias oct 30, 2014 status.
These radial lines indicate that the bolt is a grade 8 bolt. The society of automotive engineers and the industrial fasteners institute have established specific ranges of hardness and tensile strength for each grade of fastener. Usually fastener standards specify two types of marks to be on the head of a bolt. Sae j429 grade 2 is a low carbon steel strength grade that has improved strength. Mudge fasteners wants to help you identify what these head markings are and when youll need to know them. In part 3 of our series on head markings, were going to talk about metric fasteners. A sdvosb service disabled veteran owned small business. North american mfg identification markings electronic fasteners. Metric head markings bolt head markings part 3 wilsongarner. Steel 67623 b 8 x symbol for identification of grade, i.
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