Quick Answer

Frequent Question What bolt is stronger than Grade 8?

Grade 9 Bolts

Not only are these bolts considerably stronger than they’re grade 8 counterparts, but they are also considerably more resistant to corrosive elements as they are made with yellow zinc chromate.

Is Grade 8 or 10.9 stronger?

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.

What does Grade 8 mean for a bolt?

Grade 8 – Grade 8 bolts are made from medium carbon alloy steel. The bolts of this grade feature 6 radial lines. The nominal size of the grade 8 bolts can be from 1/4″ to 1 1/2″. The minimum yield strength of this grade bolt is 130,000 psi.

Which is stronger Grade 8 or Grade 10 bolt?

No matter the system used to grade the bolts, the higher number means the stronger the bolt. For most home and automotive applications, you won’t need anything more than a grade 8 bolt strength or metric class 10.9.

Is Grade 8 or 8.8 Stronger?

Table 1.

Grade/Class Strength
Grade 5 Medium strength.
Grade 8 High strength.
Metric Class 4 Similar to Grade 2.
Metric Class 8.8 Similar to Grade 5.

Are stainless bolts stronger than Grade 8?

Stainless Steel Grades &amp

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.

Is Grade 8 or 12.9 stronger?

Used in high stress environments, grade 12.9 fasteners are the highest class of metric cap screws. Where Grade 8 fasteners have a 150,000 psi tensile strength, 12.9 fasteners have a 180,000 psi tensile strength, making them more durable than the grade 5.

What does 10.8 mean on a bolt?

This number is 10% of the minimum tensile strength of the bolt (10% of proof strength for nuts). Thus, multiplying this number by 10 will produce the minimum tensile strength of the fastener in MPa.

What grade is an 8.8 bolt?

High tensile steel bolts

Grade 8.8 high tensile steel is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc. It can be plated in many other coatings.

Will Grade 8 bolts rust?

Grade 8 bolts have 6 evenly spaced radial lines on the head.” Unlike stainless steel, which is highly resistant to corrosion, steel, however reinforced, will oxidize over time and rust. Grade 8 bolts that are not galvanized or plated with yellow zinc, however, are cheaper.

What does 8.8 mean on the head of a bolt?

So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.

What kind of bolts do not rust?

When it comes to rust-resistant fasteners, stainless steel screws are the absolute best option. Stainless steel screws contain certain properties that allow them to withstand harsh outdoor elements to greater effect. As a result of their rust-resistant design, stainless steel fasteners see use in many outdoor projects.

What grade bolt has the highest shear strength?

12.9 Bolt Shear Capacity

  • 12.9 Bolts. A 12.9 bolt is one of the highest grade of bolts produced. Known for their high tensile strength, they are built with both hex and Torx heads and are available in zinc or chrome finishes.
  • 12.9 Shear Strength. The minimum tensile strength of a 12.9 bolt is 1220 MPa.

What is the highest grade bolt you can get?

The 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.

How do I choose a bolt grade?

Bolts are typically marked on the head to show what grade bolt they are. For a list of the most common grade markings see our Material Grade Identification and Properties Chart. Note that, in addition to the grade marking, many bolts also have a manufacturer’s mark.

What is a grade C nut?

C. This nut grade denotation is for nuts that are used in heavy construction. They are marked with three curved lines around the central hole. This grade meets ASTM A563 specifications and is commonly used with ASTM A325 and ASTM A354 bolts.

Is Grade 8 and 8.8 is same?

Is Class 8.8 the same as Grade 8? A: The answer is no. Class 8.8 is not the same as Grade 8.

What is a class 10 nut?

Class 10 nuts are metrics nuts with a steel grade equivalent to the SAE grade 8 classification. These are high-strength steels used in the automotive and structural industries.

Are Grade 8 bolts brittle?

Grade 8s will yield at approximately 130,000 pi, grade 5s at about 92. The 5 will fail before the 8 if subjected to the same load. However, the grade 8 will fail more catastrophically when it does. Basically, you will have less, if any warning, because of the brittle nature.

Are titanium bolts stronger than steel?

Applications for Titanium Fasteners

The strength and low weight of Titanium make it exceptionally unique, and some grades of Titanium can be anywhere from two to four times stronger than Stainless Steel.

What is the strongest stainless steel bolt grade?

(Between 15%-20% Chromium, Between 5%-19% Nickel) – Austenitic stainless has the highest degree of corrosion resistance of the three types. This type of stainless includes these grades: 302, 303, 304, 304L, 316, 32, 347 and 348. They also have a tensile strength of between 80,000 – 150,000 PSI.

How do you tell if a bolt is a Grade 8?

English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head. A grade 8 bolt will have 6 radial lines on its head.

Are socket head cap screws stronger than Grade 8?

Socket head cap screws are not grade designated as are hex head cap screws. A standard inch series socket head cap screw is 20% stronger than a Grade 8 hex head cap screw and 50% stronger than a Grade 5 hex cap screw. The tensile strength is a minimum 180,000 psi for sizes 1 ?

What grade are cat bolts?

Cat Bolts. Cat® Bolts are built to exceed SAE Grade 8 standards and ISO 10.9 strength specifications for improved reusability and longer wear.

What is a Class 8.8 metric bolt?

Have AQuestion. Grade 8.8 Bolts are manufactured using medium carbon steel that has been quenched and tempered. Used in railroad equipment, motors, engines and processing equipment, grade 8.8 bolts exhibit good tensile strength and perform well in most environments.

What does 307A mean on a bolt?

Low carbon steel

Head Marking Grade and Material Mechanical Properties
Min. Tensile Strength (psi)
307A Low carbon steel 60,000
No Markings Grade 2 Low or medium carbon steel 74,000

How hard is a grade 8 bolt?

Grade 8 bolts are designated as a 150 ksi. This means its tensile strength or the resistance it has before it is subject to breaking under tension is equal to 150,000 lbs. per square inch. In comparison, a Grade 5 bolt is weaker as its tensile is 120 ksi, placing it at 120,000 lbs.

Are grade 8.8 bolts Galvanised?

1. Grade 8.8 Hex Bolts are available in Hot-Dip Galvanised Finish.

How much weight can a 8.8 bolt hold?

For example, a grade 12.9 bolt will not snap until every square millimetre of the bolt cross section is carrying a load of at least 120 kg. Similarly a grade 8.8 bolt will not snap until it is carrying a load of 80kg per square millimetre.

How strong is a metric 8.8 bolt?

Metric steel bolts, screws and studs – proof and tensile strength.

Property Class Size Range (mm) Minimum Tensile Strength (106 Pa)
8.8 M1.6 – M36 830
9.8 M1.6 – M16 900
10.9 M5 – M36 1040
12.9 M1.6 – M36 1220