metric bolt head markings

Click here to download a printable . Head Marking. The specification for this material grade fasteners is the ASTM A324. Two values are listed for each bolt size. 307A 307B A325 A449 BC BD A490 H - K G 9 for additional technical information, contact fastenal engineering at engineer@fastenal.com. Mudge Fasteners wants to help you decipher these head markings and when you'll need to know them. 57,000. Yield Strength (MPa) Min. Tightening torque (non lubricated) is; 29Nm for a Hex Head Bolt with Pitch = 1.25mm. These numbers or markings indicate their minimum strength or, technically speaking, their property class. Its very unlikely to find a JIS standard bolt in the US without . Some metric nuts also have the strength class number stamped on their face. And finally since I know people are coming here because they do not know what the lines on the heads of bolts mean, here is an example of two bolts Made in Canada. The 12.9 is the Class head marking under ASTM F568M standard for Bolts of a high grade (1220 MPa), being Alloy steel, quenched and . They have smaller heads than standard metric bolts. 16mm - 72mm : 600: 660: 830: Class 10.9 Alloy steel, quenched and tempered: The shank size of Bolt Grades & Head Markings. An M10 bolt with a 10 mm shank features a hex head that's 16 mm across. Grade 7 English Bolt 4. In the metric world (a.k.a. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. Dimensions. If the bolt has numbers on the head then its metric. Grade 5 fasteners have a minimum tensile strength of 120ksi for diameters ¼ inch through 1 inch and 105ksi for diameters over 1 inch through 1-1/2 inches. Note: JIS specialty bolts - These bolts meet the old JIS specification. lines on SpiralotF products only. Our metric stud bolt to nut table is meant to help determine the correct size bolt or nut for your purpose. JIS bolts are available only in diameters where the head size is different than standard metric bolts. Bolts, Screws, Studs Low or Medium Carbon Steel 1/4 thru 1-1/2 33,000 60,000 ASTM A307Grades A&B Low Carbon Steel . Yield Strength Min. Inch has one strength level, alloy steel. Grade or Class. Bolts heads of different types are stamped with differing markings for two purposes. Each grade has a specific bolt strength. Most bolt markings are found on the fastener head. 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. and shorter in lengths. Tensile Strength (MPa) 8.8 The 8.8 is comparable to the SAE Grade 5. Contact Us. Socket head cap screw markings. The ASTM requires structural bolts to be distinctively marked. IFI STANDARD - BOLT BOLT ASTM A307 1) Specification Bolt ASTM A307 2) Meets/Exceeds ASTM A307 / ANSI B18.2.1 3) Products' Range Hex Bolt Gr.A / Hex Screw Gr.A / Heavy Hex Bolt Gr.B / Carriage Bolt Gr.A / Threaded Rod Gr.A 4) Thread UNC / UNF / Left Hand Choosed For Threaded Rod Gr.A Only 6) Material Low Carbon Steel / Middle Carbon . Use the dimensions of your bolt to determine the appropriate size nut. Usually a tensile strength in the range of 112,000 to 116,000 PSI. 35Nm for a Hex Flange Bolt with Pitch = 1.25mm. Yield Strength (MPa) Min. PC 8.8 parts have a minimum tensile strength of 800 MPa for parts 16mm in diameter and under, and 830 MPa for parts with a diameter over 16mm. The bolt may intentionally be the weakest link in a system. Bolts are classified by the diameter of the thread not the diameter of the head of . Yes, there is a F-911 hex bolts and 12 point flange bolts that are rated between 180,000 & 190,000 psi tensile strength. Metric fasteners hold a property class designation, while those measured in inches are stamped with an . There are different types of bolts with different heads and different threads. The grade markings on the head tell the story. Spend $250 and above and get a 15% Discount. Hex Bolts. Yield Strength (psi) Min. is marked on the head. These are the bolts used for flywheels, cylinder heads and connecting rods in European and Japanese engines. Rather than being stamped with F593C/D or F593G/H (ASTM specifications for inch series stainless bolts), metric bolts will have a metric property class designation stamped on the head. Microdot, Inc Microdot Industrial markings for Fastening Systems Group Everlock Detroit Ô 431 Stephenson Highway Michigan Rivet Corp 13201 St hens Rd warren, 48089 Microdot Aerospace SYStems Fullerton. You can read more about this here. 67618M X Medium Carbon Steel, Quenched and . | Fasteners 101 MECHANIC MATH - Standard wrench sizes made EASY . Spend between $100 - $249 and get a 10% Discount. Download a complimentary PDF of our Fastener Markings chart. For metric M5 and larger, the property class and manufacturer's I.D. First step is to check to see if there are any head markings. As with unified fasteners, metric bolts will be stamped to designate the type of stainless steel that they are made of. Head Markings Metric Bolt Class Mechanical Properties Proof Load (MPa) Min Yield (MPa) Min Tensile Strength (MPa) - Class 12.9 - Alloy Steel, quenched and tempered 970 1,100 1,220 - Class 10.9 - Alloy Steel, quenched and tempered 830 940 1,040 - Class 8.8 - Medium carbon steel, quenched and tempered 580-600 640-660 800-830 A4-80 Stainless . Grade 5 English Bolt 3. Explain the meaning of numbers on the bolt heads, for each bolt using calculation in the table below. 31Nm for a Hex Head Bolt with Pitch = 1.00mm. Nominal Size Range (Inches) Mechanical Properties. 5. Bolt Head Markings. From the service manual. Login / Register . The table includes figures showing bolts either unmarked or with a large 4 or 7 on the head. The tensile strength - the measure of a metals resistance to breaking apart in two pieces. Note: Some bolts share identical head identification and have significantly different strengths. If there are no head markings at all, they are most likely comparable to the SAE grade 2. They don't have the typical grade marks on the head like a metric bolt would (8.8,10.9 etc) Is there a chart I can use to identify this? . Materials, Machanical Properties and Markings: Grade 5: Grade 8: Class 8.8: Class 10.9: L9: Grade 5: Grade 8 . Spend up to $99 and get a 5% Discount. Link Grade and Class Scroll the fastener head identification or go to the alphabetical link showing the first letter Metric has two strength levels, property classes 12.9 and 8.8. specifically, it's a JIS standard metric bolt, if 14mm is the correct head measurement than its proabaly M10x1.25 since DIN and ISO bolts don't use a 14mm hex head in any size. Metric bolts have the grade number formed on the head face. 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. Standard headed fasteners, both inch and metric, are required to have a grade or property class marking on the head if it has been heat treated. Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties ; Proof Load (MPa) Min. It too is made in China. The larger sized bolts are used . METRIC BOLTS MECHANICAL PROPERTIES; HEAD MARKING GRADE AND MATERIAL Nominal Size Range (mm) Min. Mechanical Properties and Markings; Inch and metric Materials, Mechanical Properties and Markings . In addition to the indicated grade marking, all grades, except A563 grades O, A and B, must be marked for manufacturer identification. Thread Pitch Metric equals the distance between threads. Fasteners commonly have two different markings: a unique manufacturer identification symbol - such as letters or an insignia - and information about the fastener strength. The diameter of the 8.8 Jh Bolt range from 20mm to 100mm. Download chart: Bolts Markings. DIN (European) Metric. 8.8 is about 30% weaker. Nuts tend to have much smaller markings, although they are also made of numbers and letters or lined patterns. Proof Load (psi) Minimum Yield Strength (psi) Minimum Tensile Strength (psi) American Bolts. Now to really screw things up for all of us that . Again,thisistypicallydone to eliminate other failure modes and make failure easier to predict. These bolt head markings include the manufacturer's mark, the grade of bolt (ex. Metric 8.8 Medium Carbon Steel All sizes under 16mm 580 800 640 16mm thru 72mm 600 830 660 Metric 10.9 Alloy Steel Another we have seen, has JDF on the head. The below diagram shows examples of English and Metric bolt and nut markings. Determining Bolt Grade and Head Markings with Northeast Fasteners on NutsandBolts.com Bolt Grade Markings. Thanks for any help The first two are 1/4″ diameter and the last one is 6mm. CA 92634001 K Symbol used on sheet meal or stamped Stylized K symbol On products. Property Class. Grade 2 requirements for sizes 1/4 through 3/4 in apply only to bolts and screws 6 in. If you have ever looked a metric hex bolt you might notice the markings 8.8, 10.9 or 12.9 this does not mean grade 8 . For your example, Grade 9T, M8. Many of our bolt styles are available in various grade and class options with each grade containing distinctive head markings. For bolts and screws longer than 6 in. Bolt Grades and Head Markings. The rule is that the same grade of nut should always be the same as the grade of bolt, or a grade higher. Determining Bolt Grades & Understanding Head Markings The Nut and Bolt Solution Series Identifying bolt grades and head markings for US grades 2, 5 and 8. There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. . Material. Bolt heads and nuts are often marked with numbers, letters, dashes, slashes, dots, or an assortment of other marks. You will probably be fine with high grade bolts, but by getting new OEM, the numbers are on your side, and you will probably be less likely to damage mating components. An M10 bolt with a 10 mm shank features a hex head that's 16 mm across. Metric grades 8.8.,10.9 and 12.9 (socket products). 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. A 12.9 grade bolt will being stretched at 90% of its breaking load. Metric Stud Bolt To Nut Size Chart. Tightening torque (non lubricated) is; 29Nm for a Hex Head Bolt with Pitch = 1.25mm. With the metric bolts the higher the number, the higher the tensile, higher the strength. Such markings differ based on how the fasteners were made. 2. The highest metric grade, 12.9, is even stronger, with an ultimate tensile strength of over 175 ksi and a yield strength of over 157 ksi. The higher the grade, the stronger the bolt. Tensile Strength Minimum 400 MPa (58000 psi) 520 MPa (75000 psi) 830 MPa (120000 psi) 1040 MPa (150000 psi) 1220 MPa (176000 psi) Yield Strength Minimum240 MPa 420 MPa 640 MPa 940 MPa 1100 MPa Proof Load220 MPa 380 MPa 600 MPa 830 MPa 970 MPa Hardness MinHRB-67 HRB-82 HRC-22 HRC-32 HRC-39 MaxHRB-95 HRB-95 HRC-34 HRC-39 HRC-44 Contact American Fastener with any questions or for a custom quote. 55,000. Tensile Strength (MPa) Class 4.8 4.8 Class 5.8 5.8 Class 8.8 . 8.8 . Manufacturer's identification mark, e.g., "X", Applied to head (raised or depressed at option of the manufacturer). STANDARD BOLT IDENTIFICATION MARKINGS Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) Low‐ or Medium‐ Carbon Steel 1/4 THRU 1 ½ 33,000 36,000 Low‐Carbon Steel 1⁄4 thru 4 −− −− SAE J429 Grade 2 Low‐ or Medium‐ Carbon Steel 1⁄4 thru 3⁄4 Over 3⁄4 thru 1 ½ 55,000 33,000 57,000 36,000 74,000 60,000 No Grade Mark 800. 74,000. . MMPRINCE4000. (866) 688-2500. A2 or A4. These lines indicate that the bolt is a Grade 5. Studs have a cross + stamped on them. They can be a combination of numbers and letters or a pattern of lines. They can come in any head form and finish, but the most common are hex-head cap screws (think Allen . Also, on the head should be the manufacturer's identification marking like the triangle in the pictures below. Metric Bolts Head Marking Class and Material Nominal Size Range Mechanical Properties Proof Load (MPa) Min. The diameter between flat sections on a structural metric bolt's head is always 1.8 times the diameter of its shank. 1/4 thru 3/4. Head Markings Fastener manufacturers product identification starts with the manufacturer's symbol marked on the head, all high-grade fastener product contains the manufacturers mark along with the material grade. The bolt may intentionally be the weakest link in a system. Grade 2 English Bolt 2. Additonal information on bolts is located at the bottom of the webpage. Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. MEMBER. markings. The 8.8 Metric Bolt is one of the standards adopted. Click a product number to check the head diameter. (20 pts) Metric bolt head marking is shown in figure below for various bolt classes. They can come with different finishes as well. ASTM A 449 Regular Series 67617M Galv. use in the shop, the triangle on the head, in the package marked "Made in Canada". Metric 10.9: Alloy Steel: 5mm thru 100mm: 830: 1040: 940 . bolts: metric standards. Aerospace bolt head markings will vary by manufacturer as each manufacturer has a trademarked head marking. Low or Medium Carbon Steel. Again,thisistypicallydone to eliminate other failure modes and make failure easier to predict. For metric bolts strength is according ISO 898 Mechanical properties of fasteners made of carbon steel and alloy steel described by "property classes" with designations 4.6, 4.8, 5.8, 8.8, 9.8, 10.9 and 12.9. Direct Number: (817) 467-1377 800 Number: (800) 361-6627 Fax Number: (817) 467-5365. SAE Grade 8, Metric 10.9. The first is for conventional (unmarked) or "4" marked bolts and the second for "7" marked bolts. Class 10.9 Hex Flange Bolts Zinc Plate. The following markings are the primary . I recently purchased bolts from a dealership but need to verify bolt quality. Grade 2. Standards for metric bolts are promulgated by the ISO, but adopted by individual nations. English bolts have radial lines on their head to identify the grade, or strength class. 5. In the picture to the left, you can see 3 bolts that look very similar at first glance when lying around your work bench. Proof Load: The tensioned load that a fastener must support without evidence of permanent deformation. Refer to the Imperial vs Metric Strength Chart for strength comparisons. Metric: 8.8: Class 8.8: Medium Carbon Steel, Quenched and Tempered: All Sizes thru 1-1/2: 85,000: 92,000: 120,000: 10.9 . For example, an 8.8 grade bolt will begin to stretch when the load of a bolt is 80% of its breaking load. With an imperial bolt the more lines you have the higher the tensile the stronger the bolt. Most bolts are stamped with either a number (metric bolts) or a series of lines (American bolts also known as fractional bolts). Metric Bolts. 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Bolt styles are available in various grade and Material Nominal size Range ( mm Min. Much finer than a coarse thread ) JIS ( Japanese ) metric our bolt styles are available only in where. Find an ISO standard metric bolt to determine the correct size bolt or nut for your purpose with heads! & amp ; 9T 10 mm shank features a Hex head bolt with Pitch = 1.25mm ISO standard bolt. And those with slotted or recessed heads strenght stamped on the head and are made from carbon! For your purpose % less expensive 2 less than the actual grade ; 9 relating to grade 4T 7T! Identify the standard to which the bolt triangle in the head diameter mark depends the... Thread not the diameter of the bolt heads may also include the manufacturer & # x27 s. The fastener head to check the head, 8.8, 10.9, 11.9.12.9 heads, each... 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