Countersinking adds a $9 minimum to your line item. The $9 minimum applies to cart totals. Pricing starts at $3 per countersunk hole, with quantity discounts starting when you order more than one of an identical part.
|Identical Part Quantity||Holes per Part||Total Holes||Total Cost||Breakdown|
|1||4 holes||4||$12||$3 per hole x 4 holes = $12|
|2||4 holes||8||$19.20||$3 per hole x 8 holes = $24
$24 x 20% qty discount = $19.20
|10||4 holes||40||$85.20||$3 per hole x 40 holes = $120
$120 x 29% qty discount = $85.20
|40||4 holes||160||$288.00||$3 per hole x 160 holes = $480
$480 x 40% qty discount = $288
The success of countersinking is heavily dependent upon the material thickness and the size of the part, so we’ve implemented sizing minimums and maximums your part will need to adhere to in order to be countersunk:
Minimum part size of 1”x4”
Maximum part size of 14”x46”
Be sure to check our Processing Min/Max chart for more information on minimum and maximum geometry for your specific material, thickness, and part size.
At this time, we offer 7 materials for countersinking:
When you upload your file to our app, you’ll be able to view your part in a 3D model to check that the final product will function the way you intended. Use this model to make sure your countersinks are placed in the correct orientation on your part. Countersinks can be placed on the top or bottom face of a part, so it’s important to check carefully that they are indicated on the correct face.
When setting up your file for countersinking, keep in mind that you only need to include the inner circumference of the hole (called the Minor) that is to be countersunk. Do not include the outer circumference (the size of the countersink, called the Major) in your file as that is what will be cut during the machining process, causing your hole to be too large to countersink. Your file should look like the one indicated here:
The Major hole size should be the same size or slightly larger than the diameter of the hardware head you’re using. It’s best to use the exact diameter of the hardware head as your reference, but a good rule of thumb is to make the countersink 50% larger than the internal hole (Minor).
You can see examples of countersinking sizing in the chart below. It’s important to note that these examples are based on sample hardware (linked in the chart) and hardware specifications and styles will vary based on the manufacturer.
The depth of the countersink should be no more than 60% of the material thickness. Any deeper and you are risking the structural integrity of the material and part. If your countersink needs to exceed that depth, make sure the holes are spaced out far enough away from each other to prevent undue stress.
The angle of the countersink is dependent upon the hardware being used. Ideally, the hardware has at least 50% contact with the countersunk hole, but it doesn’t have to match exactly. The standard countersink angle for metric hardware is 90°, and the standard countersink angle for imperial hardware is 82°. We offer sizes in both angles.
The “Major” measurement shown here is the larger diameter at the top of the countersink, and the “Minor” measurement is the smaller diameter at the bottom of the countersink where the hole is at its smallest.
|4mm (0.157”)||2.39mm (0.099”)|
|5mm (0.197”)||2.49mm (0.103”)|
|6mm (0.236”)||3.18mm (0.130”)|
|8mm (0.315”)||4.04mm (0.164”)|
|10mm (0.394”)||5.00mm (0.202”)|
|12mm (0.472”)||6.35mm (0.255”)|
|16mm (0.630”)||8.00mm (0.320”)|
|0.255” (6.48mm)||0.130” (3.18mm)|
|0.307” (7.80mm)||0.164” (4.04mm)|
|0.359” (9.12mm)||0.193” (4.78mm)|
|0.411” (10.44mm)||0.199” (4.93mm)|
|0.531” (13.49mm)||0.255” (6.35mm)|
|0.656” (16.66mm)||0.318” (7.95mm)|
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