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How do you dimension a counterbore?

How do you dimension a counterbore?

Dimensioning Counterbore Hole Select Dimension Tool in the Annotate Tab > Double Click on the outer circle o the counterbore (NOTE Leader Arrows should always point to the larger hole) This will place the diameter of the large hole Page 9 4.

When drilling for a 1/2 socket head cap screw what size hole would you drill for a counterbore?

ANSI Hardware Design Guides ISO Metric Hardware Design Guides

Nom. Size Screw Nom. Size Screw Decimal Nominal Drill Size A
3/8 0.3750 25/64
7/16 0.4375 29/64
1/2 0.5000 33/64
5/8 0.6250 41/64

What is the diameter of the counterbore?

Countersink diameter is the final diameter of the hole after drilling, measured in the start surface. The countersink diameter cannot be larger than the tool diameter.

What would the drilled depth be for the head of a counterbore fastening for an M6 size in mm )?

6.8 mm
For example, an ISO 4762 M6 socket cap head bolt with a normal fit counterbored hole will require a pilot hole diameter of 6.6 mm, a counterbore diameter of 11 mm, and a counterbore depth of 6.8 mm.

How do you dimension counterbore in Autocad?

In Dimension Text Editor, Click Symbol Ribbon, and then Click Other… See below an image. Then You will get Character map Dialog box. If you change Font to GDT, You will see Counterbore and depth symbols.

How deep is a counterbore?

Maximum depth of counterbore must be less than or equal to 0.6 times the sheet metal thickness.

What is counterbore hole?

A counterbore is used to enlarge the opening of a hole producing a flat bottom so a socket-head screw will fit flush with the surface of the part. Lock washers may be used to ensure a secure assembly. Typically counterbores are used for a single purpose. Countersinks have a greater range of applications and angles.

What is the symbol for counterbore?

A counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature.

When preparing a hole for a counterbore how much oversize should the hole be to give proper clearance for an inch socket head cap screw SHCS )?

For example, an ANSI Inch 2″ socket cap head bolt with a normal fit counterbored hole will require a pilot hole diameter of 2 1/8″, a counterbore diameter of 3 1/8″, and a counterbore depth of 2 1/16″.

How do you find the counterbore hole?

Counterbore Hole Dimensions Chart Calculator for recommended clearance and hole dimensions for socket head cap screws from #0 through 2 inches size….COUNTERBORE HOLE DIMENSIONS CHART CALCULATOR.

Nominal Screw Size #0 #1 #2 #3 #4 #5 #6 #8 #10 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1 1/4 1 1/2 1 3/4 2
Fit Class1,2 Normal Close

How do you specify counterbore on drawing?

Counterbored holes are specified by giving the diameter of the drill, the diameter of the counterbore, and the depth of the counterbore. If the thickness of the material below the counterbore is significant, this thickness rather than the counterbore depth is given.