What Is Counterbore Depth?

  1. The counterbore depth can be determined by measuring the distance between any two points on the surface of the section that the feature has been bored into.
  2. As with all other +/- location controls, specifying counterbore depth as a directly toleranced dimension has the same effect.
  3. It’s a bit of a stretch.
  4. The direction of measurement and the reference point are not clearly established in this document.

What is the purpose of a counterbore?

  1. A counterbore (symbol:?) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the instrument that was used to construct that feature, in a cylindrical flat-bottomed hole.
  2. When a fastener, such as a socket head cap screw, is needed to sit flush with or below the level of a workpiece’s surface, a counterbore hole is often employed.
  3. To view the complete response, please click here.

Do I need to specify the size of counterbore required?

It should be noted that it is always important to define the size of the counterbore that is required. A simple statement such as ″COUNTERBORE FOR M10 RD HD SCREW″ will not suffice since the screw head will naturally fit into any counterbore that is greater in diameter than the screw head.

How does a counterbored drill machine work?

The procedure entails expanding existing holes, with the depth of the expanded hole being regulated by a stop on the drilling machine during the operation. In order to aid in the placement of the counterbored hole, a pilot is placed at the tip of the tool that is a clearance fit in the hole that was previously drilled.

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What type of screw do you use for counterbore?

A stop on the drilling machine is used to control the depth of the expanded hole, which is necessary for the operation to be successful. In order to help in the placement of the counterbored hole, a pilot is placed at the tip of the tool that is a clearance fit in the previously drilled hole. The pilot is then removed.

What is the counterbore depth?

USA SOCKET-HEAD CAP SCREWS
Screw dia. Counterbore dia. Counterbore depth
1 1/2 2 3/8 1.500
1 3/4 2 3/4 1.750
2 3 1/8 2.000

How do you measure counterbore?

COUNTERSINK DIAMETERS CAN BE MEASURED QUICKLY 002′ or 05mm diameter increments on the dial face, or an optional digital indication, may be read in by simply pressing the spring-loaded, precise angle Gaging Plunger into the countersink and reading the dial straight into the machine. The COUNTERSINK GAGE is a direct reading gage that measures the amount of ink in a container.

What is meant by counterbore?

1: an expansion of the mouth of a cylindrical bore that has a flat bottom. 2: a drill used to create a counterbore — see countersink for a more detailed definition.

What is the diameter of the counterbore?

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

Why is counterbore used?

The spotface is normally cut with a tool known as a counterbore, however an endmill may also be used in some cases. Only a small amount of material is removed in order to make the surface flat. An additional application for a counterbore is the creation of an angular surface for a fastener head on a non-perpendicular surface.

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What is Counterboring and countersinking?

Generally speaking, a countersink is a cone-shaped hole that is cut into a printed circuit board (PCB) to allow the flat head of a socket cap screw to sit flush with the surface of the board (see Figure 1). It is a cylindrical flat-bottomed hole that is meant to accommodate a hex head or a socket head cap screw that is used to fasten a printed circuit board (PCB) to a support surface.

How do you measure the depth of a blind hole?

A depth gauge can be used to determine the depth of a blind hole in a wall. There are many various varieties available, each suited to a certain hole size and level of precision necessary. Here’s an image of a digital depth gauge for your reference. The reading is determined by how far the rod extends beyond the flat base, which is equal to zero.

How do you call a countersink?

The leader, or dimension line, should be drawn so that the arrow is barely touching the outside border of the countersunk hole’s outer circle. The line should be drawn radially such that it points toward the center of the hole and, if it were expanded, it would pass through the center point of the hole.

What is the difference between counterbore and spotface?

What this means is that a counterbore is a cylindrical recess that is typically machined around a hole to admit a screw and allow the screw to sit flush with the surface, whereas a spotface is a shallow circular or cylindrical recess that is machined on (for example) a cast part to provide a flat face against which to seat a fastener; it is a shallow counterbore

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What are the main types of counterbore?

This category includes aircraft counterbore configurations as well as cap screw counterbore configurations, fillister head screw configurations, blade combinations, and back counterbore configurations.

Does a counterbore have a pilot?

Counterbores with a built-in pilot that cannot be removed ensure that the counterbore is centered in the hole and that the seat is level. Solid pilot counterbores are sometimes referred to as solid pilot counterbores.

What size is a 33 drill bit?

M2 High-Speed Steel Drills – Premium Swift Bore Wire Gauge (Number) M2 High-Speed Steel Drills

Product No. 01433
Drill Size No. 33
Decimal Inches 0.1130
For Tap Size 6-40 NF (National Fine SAE)
Weight 0.007 lbs

What size is a #40 drill bit?

Drill Bit Size Chart

Size Decimal Equivalent Size
79 0.0145 28
.38 mm 0.015 9/64′
1/64′ 0.0156 3.60 mm
.40 mm 0.0157 27

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