The grades are two five and eight.
Sae grade 8 socket head cap screws.
3 8 24 dia thread unf hex head grade 8 steel cap screws.
1 1 4 7 dia thread unc hex head grade 8 steel cap screws with grade 8 steel construction these hex head cap screws offer high tensile strength and high torque capabilities.
The society of automotive engineers sae has set the standards for different grades of hex head cap screws according to their strength.
They have a round cap with a hex head and are tightened with a socket wrench drive.
The hexagon shaped heads are suitable for socket or wrench tightening.
Steel grade sae 5 sae 8 socket head cap screws property class 8 8 10 9 12 9 socket head cap screw torque in pound foot or pound inch torque in newton meter nm lubed means cleaned dry bolts lubricated with standard medium viscosity machine oil.
180 ksi tensile strength for fasteners up to 1 2 inch 170 ksi for larger sizes astm a574 p.
Head height is 50 of a standard socket head and the socket size is smaller.
High strength grade 8 steel hex head screws made from grade 8 steel these screws can be used in high stress applications such as valves pumps motors and automotive suspension systems.
The socket head enables driving where there is not sufficient space for wrenches or sockets.
This is a metric grading similar to the sae grade 8 classification which is used in automotive and structural industries as well as in high temp applications.
They are at least 25 stronger than medium strength steel screws.
High strength grade 8 steel hex head screws made from grade 8 steel these screws can be used in high stress applications such as valves pumps motors and automotive suspension systems.
Lubricate all contact areas of the bolts and washers.
They are at least 25 stronger than medium strength steel screws.
Similar thread design as a socket cap screw but the dome shaped head is wider and has a lower profile.
Although grade nine is also sold and is assumed to be around 20 percent stronger than grade eight it isn t an sae grade and doesn t have standard chemical and physical.
Longer caps are easier to see when fastened while button and flat head caps are less likely to snag clothing or linkages.
Similar to a button head socket screw but with an 82 degree countersunk flat head.
For many more head markings and their corresponding specifications see here.
Metric plain and zinc plated hex and socket head cap screws 8 sae coated hex head and socket head cap screws mated with plain or zinc plated threads 9 sae coated hex head and socket head cap screws mated with coated threads 13 sae coated hex head flange screws.
