In round terms it is in 10’s of kg per square millimeter of the bolt. 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 an 8.8 bolt?
Strength Specifications of Metric Threaded Fasteners
| Property Class | Nominal Size Range (mm) | Proof Strength (MPa) |
|---|---|---|
| 4.8 | 1.6-16 | 310 |
| 5.8 | 5-24 | 380 |
| 8.8 | Under 16 (incl.) | 660 |
| 8.8 | 17-72 | 580 |
How much weight can a Grade 8 bolt support?
The tensile strength of a grade 8 bolt is 150,000 pounds per square inch. Tensile strength is the maximum load in tension (stretching) that a part can carry without breaking.
How much weight will a bolt hold?
For example, an eye bolt with a 1/4 inch shank can typically hold up to 600 pounds at a straight pull (no angle). However, at a 15 degree angle, the maximum weight capacity drops to 480 pounds (80% of the “straight pull” weight capacity).
What does class 8.8 mean on 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.
How much weight can an 8mm bolt hold?
| Size | Grade 8.8 | Grade 9.8 |
|---|---|---|
| M5 | 820 kg | 923kg |
| M6 | 1,160kg | 1,310kg |
| M8 | 2,120kg | 2,380kg |
| M10 | 3,370kg | 3,770kg |
Are Grade 8 bolts the strongest?
A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. A grade 8 bolt would be one that meets ASTM A490 standards.
Is 8.8 bolt high tensile?
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.
How much weight can a Grade 8 3 8 bolt hold?
Forget about shear loading, a good, commonly used bolt such as the Powers PowerBolt and its ilk will not break. A 3/8-inch bolt of this type is rated to 7,000 pounds in 6,000 psi concrete (basically granite) and 4,000 pounds in 2,000 psi concrete (hard sandstone).
How strong is a grade 8 bolt?
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. A maximum of 120,000 psi of tensile force (proof load) can be applied to grade 8 bolts.
What is the shear strength of a Grade 8 bolt?
Shear strength of a grade 8 bolt in good condition is 91,000 psi.
How much force can a bolt withstand?
Steel bolts are graded according to newtons per millimeter squared for bolt tensile strength as compared to yield strength. For example, a steel bolt with a rating of 5.5 will provide roughly 500 newtons/mm2 of bolt tensile strength and approximately 400 newtons/mm2 of yield strength.
How do you calculate bolt load capacity?
The tensile load a fastener can withstand is determined by the formula P = St x As. To find the tensile strength of a particular bolt, you will need to refer to Mechanical Properties of Externally Threaded Fasteners chart in the Fastenal Technical Reference Guide.
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. |
What steel is used for 8.8 bolts?
medium carbon steel
The specification Bs 3692 Grade 8.8 standard fasteners are manufactured using medium carbon steel. This medium carbon steel has been treated to heat by both quenching and tempering.
What size is a 8.8 bolt?
8mm x 1.0mm x 60mm
Metric hex bolts, Zinc plated class 8.8 steel, 8mm x 1.0mm x 60mm – Bolt Depot.
How strong is a 6mm bolt?
6mm-1.0 Class 8.8 Hex Bolt (coarse thread)
| Class: | 8.8 | 931/933 |
|---|---|---|
| Material: | Steel | 1.00 |
| Head Style: | Hex | 60mm |
| Yield Strength, psi: | 92,800 | 10mm |
| Tensile Strength, psi: | 116,000 |
Is an M8 bolt 8mm wide?
But, to answer your Q – an M8 bolt will fit in an 8mm hole.
Is M8 bigger than M6?
The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated “mm”). For nuts, size will appear as diameter and pitch.
Table 3.
| Metric | Closest Inch |
|---|---|
| M6-1.0 | 1/4-28 (Larger) |
| M7-1.0 | 1/4-28 (Smaller) |
| M8-1.25 | 5/16-18 (Smaller) |
| M10-1.5 | 3/8-16 (Smaller) |
Will Grade 8 bolts rust?
Grade 8 Steel Bolts
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 is the strongest metal for bolts?
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.