Quick Answer: What Is A High Strength Bolt?

Are a325 bolts high strength?

Prior to its withdrawal in 2016, the ASTM A325 specification covered high strength heavy hex structural bolts from 1/2″ diameter through 1-1/2″ diameter.

These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts..

Are stainless steel bolts stronger than Grade 8?

Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.

What is the hardest bolt you can buy?

BUMAX® Ultra has proven itself as the world’s strongest bolt – in various highly-demanding critical fastener applications around the world where standard fasteners are simply inadequate.

Is a 10.9 Bolt stronger than Grade 8?

Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. A low carbon steel for general use.

Do a325 bolts need washers?

Per the ASTM A325 and A490 specification, they are specific to the grade of washer that is recommended, however it is not stated that a washer is required. … The only other circumstance where a washer is required is if the hole in which the bolt is being inserted is oversize or slotted.

What is the metric equivalent to Grade 8?

Approximate Equivalency Chart Metric/US Roughly Equivalent US Bolt MaterialsMetric Nut ClassSAE J429Normally UsedGrades8.8859.895+10.910or 12812.910or 12.3 more rows

How can you tell if a bolt is high strength?

To identify this grade, look out for an ‘8.8’ stamp or a set of three radial lines on the head of the bolt. Most often, customers looking for a high tensile bolt may just be looking for the 8.8 grade.

How hard is a 10.9 bolt?

Used in automotive applications and for bolting large and forged parts, metric 10.9 bolts exhibit high tensile strength and good wear resistance. … The yield strength of the bolts is 940 and the tensile strength is 1040 MPa.

What is the difference between 8.8 and 12.9 grade bolts?

The mechanical difference between the 12.9 and 8.8 is yield strength (roughly 90% of 1200 MPa vs 80% of 800 MPa). That means the 12.9 can be stretched further (i.e. torqued to some higher value) before it yields, which of course increases the clamp force.

What grade is a a325 bolt?

Type 3 grade A325 bolts shall be marked “A325” to distinguish them from standard grade A325s. Grade A490 bolts are available in diameters from 1/2 to 1-1/2 inch diameters with a minimum tensile strength of 150,000 PSI for all diameters, and are offered in two types.

What is strength of bolt?

The yield strength of a bolt can be defined as the tensile force that will produce a certain amount of permanent deformation within a specific fastener. … Proof load is the limit of the elastic range of the bolt. Designing for the use of bolts according to proof load can help prevent plastic deformation.

What is the difference between a 10.9 and 12.9 Bolt?

12.9 grade steel has 120% of the tensile strength of 10.9 grade steel. The “12” prefix indicates a tensile strength of X100 N/mm^2 and the “9” suffix indicates a multiplier. Both 12.9 and 10.9 have the same multiplier, so the comparison is straightforward: 12 to 10.

What does 12.9 mean on a bolt?

The minimum ultimate tensile strength of the Grade 12.9 Metric Hex Head Bolts is about 1242 Mpa or 180,000 PSI, making them the highest grade of bolts produced.In fact, the Grade 12.9 Nuts is known for their high tensile strength.

What is the strongest bolt grade?

grade 8The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.

What is the strength of a grade 5 bolt?

Bolt Grade Markings and Strength ChartHead MarkingGrade and MaterialMechanical PropertiesMin. Tensile Strength (psi)3 Radial LinesGrade 5 Medium carbon steel, quenched and tempered120,000105,0006 Radial LinesGrade 8 Medium carbon alloy steel, quenched and tempered150,00018 more rows