What is a Grade 5 hex bolt?
Grade 5 heavy hex bolts are externally threaded fasteners made of carbon steel. These bolts are fully threaded or partially threaded depending on the length with a six sided, hexagonal head. The ASME standard covers hex bolt dimensional specifications designated by ASME B18.
What is a Grade 5 UNC?
Grade 5 Bolts and fasteners are made of medium strength carbon steel and are specified under the Society of Automotive Engineers (SAE). with a minimum tensile strength of 120,000 psi in diameters through 1 in.
What grade is a hex bolt?
Hex bolts (six sided heads) are the industry standard for fasteners with forged heads. ASTM A307 grade A bolts, all SAE hex bolts, and several other common specifications require a standard (finished) hex head.
What are Grade 5 bolts coated with?
Grade 5 is the most common grade used in manufacturing assembly. Yellow Zinc fasteners have been plated with a clear zinc coating and are then coated again with a yellow dichromate. Yellow Zinc offers a modest amount of corrosion resistance, slightly higher than clear Zinc. Tensile Strength: 120,000 psi minimum.
Is Grade 5 a strong bolt?
Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications.
Are Grade 5 bolts stainless?
Stainless Steel Grades & Strength Stainless commonly comes in grades 18.8 (304) or T316. Stainless steel bolts are rated for corrosion resistance. 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 are Grade 5 bolts used for?
These bolts are generally used for non-critical joints and applications. A grade 5 bolt is distinguished by 3 radial lines and promises tensile strengths between 105,000 and 120,000 psi. They are most commonly found in automotive applications.
What material is a Grade 5 bolt made of?
alloy steel
Grade 5. Grade 5 alloy steel is a medium carbon zinc plated alloy steel that is heat treated to increase hardness. Grade 5 bolts have three (3) evenly spaced hash marks on the head markings (manufacturers mark may also be included).
How strong is a Grade 5 bolt?
Bolt Grade Markings and Strength Chart
| Head Marking | Grade and Material | Mechanical Properties |
|---|---|---|
| Min. Tensile Strength (psi) | ||
| 3 Radial Lines | Grade 5 Medium carbon steel, quenched and tempered | 120,000 |
| 105,000 | ||
| 6 Radial Lines | Grade 8 Medium carbon alloy steel, quenched and tempered | 150,000 |
What grade bolt should I use?
The standard strength grade (or Property Class as it is known in the standards) for many industries is 8.8. On the head of the bolt, 8.8 should be marked together with a mark to indicate the manufacturer.
What Rockwell hardness is a Grade 5 bolt?
In comparison, a Grade 5 bolt is weaker as its tensile is 120 ksi, placing it at 120,000 lbs. per square inch in tensile strength. There is also difference in the core Rockwell hardness between Grade 8 and Grade 5 bolts. Grade 8 typically has a core Rockwell hardness of C33-C39, while Grade 5 have a core Rockwell hardness of C25-C34.
What is a Grade 5 nut?
Grade 5 nuts are a finished hex pattern, and A194-2H or A563-DH heavy hex nuts are required for use with A325 bolts. Another difference is that Grade 5 bolts may be specified from 1/4″ diameter up to and including 1-1/2″ diameter. The A325 specification covers bolts from 1/2″ up to…
What is a Grade 5 cap screw?
A grade five hex cap screw has more strength than a grade two, but less than a grade eight. A grade two hex cap screw is made from medium or low-carbon steel, a grade five consists of medium carbon steel, and a grade eight is made out of medium carbon alloy steel.