This is the dimension added to the round punch diameter or shapedpunch dimensions. Die clearance is determined by the type and thickness of the material you are punching.
For stainless steel, the die clearance is 25% of the material thickness. For mild steel, the die clearance is 20% of the material thickness. For aluminum, copper or brass, the die clearance is 15% of the material thickness.
For example, to calculate the die clearance for 1/8” mild steel, multiply .125 x 20%. The die clearance is .025”.
Calculate the required tonnage per hole with this formula:
3.1416 x Diameter of Hole x Material Thickness x 25 = Tons required per hole
For example, when you punch a .500” diameter hole in .250” mild steel, the tonnage required per hole is 9.82. (3.1416 x .500 x .250 x 25 = 9.82 tons)
The formula above is for punching mild steel. When punching stainless steel, a multiplier factor of 1.4 is required. For example, 9.82 tons x 1.4 = 13.75 tons per hole.
The orientation of the shape is the position of the shape in relation to the front of the punching unit.
For example, when ordering an obround punch, select whether Point X is at the front of the unit or the side of the unit, as shown below:
Point X at front of unit
Point X at side of unit
The guide has two slots at 0 and 90 degrees. The pin in the punch fits into one of these slots to orient the shape. Regardless of how you order the orientation of the shape (Point X at front of unit or Point X at side of unit), you can utilize either position.
Quali-Tool manufactures C-frame style press tooling. Unittool is a trademark of Unittool Punch and Die Company, Inc. Quali-Tool, Inc. does not own this trademark.
Shipping & Delivery
Stock items and round punches and dies ship the same day when orders are placed by 12:00pm CST, Monday through Thursday. Orders placed on Friday that qualify for same day shipping, will be shipped on Monday.
*Limit quantities to 10 punches and 10 dies.
Round punches and dies ship in 1-2 days.
Shaped punches and dies ship in 4 days.
Stock items like springs, guides, punch heads and stock size punches ship the same day when orders are placed by 12:00pm CST. Orders placed after 12:00pm CST ship the next day.
Quali-Tool offers shipping via USPS and UPS.
Privacy & Security
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Quali-Tool offers a 30 day return policy on stock items and standard size punches.
Stock items include bolts, guides, pilot pins, punch heads, retainers, screws and springs.
For a list of standard size punches, see below.*
There is no restocking fee for stock items and standard size punches.
Products must be returned in new condition within 30 days of receipt for refund. Return shipping is not included. Refunds are for the cost of the products only.
Please email us at firstname.lastname@example.org to receive a Return Merchandize Authorization number.
Custom sized items are non-refundable.
For orders cancelled within 24 hours, there is no restocking fee for stock items. There is a 10% restocking fee for custom sized items.
For orders cancelled after 24 hours, the return policy above applies.