Summa 500-9893 Perforation Knife, 3 TPI
The Summa 500-9893 is a perforation knife for Summa cutting systems. 3 teeth per inch, with 0.197 in (5.0 mm) cuts and 0.197 in (5.0 mm) gaps, and a max cutting depth of 0.157 in (4.0 mm).
Sold individually.
What is perforation cutting?
A perforation knife cuts a line of short slits with uncut gaps between them. The material stays connected along the line, then tears cleanly by hand. Use it for tear-off tabs, fold lines, and pieces meant to separate later.
Coarse 3 TPI pattern
The 500-9893 has the longest cuts and gaps of the Summa perforation knives we carry. Equal 0.197 in (5.0 mm) cuts and gaps make the strongest perforated line, one that holds through handling and shipping and still tears by hand, at a max depth of 0.157 in (4.0 mm).
Common questions
How do I know this fits my machine?
This is a Summa part, number 500-9893. If you are not sure your Summa takes it, send us your machine model and we will confirm before you order.
Which perforation knife do I need?
Pick by how easily the line should tear. The 500-9891 (8 TPI, 0.067 in / 1.7 mm cuts) tears easiest. The 500-9892 (4 TPI, 0.118 in / 3 mm) is the middle option. The 500-9893 (3 TPI, 0.197 in / 5 mm) gives the strongest line.
How do I know when to replace it?
Watch the perforation. Teeth that no longer cut through, uneven slits, or a line that tears raggedly instead of cleanly all mean the knife is worn.
Getting the most from your cutting table
A fresh blade is a good start. But if you are going through blades faster than expected, or cut quality has become inconsistent, the blade is rarely the whole story. Cut depth, speed, pressure, and machine condition all affect how long a blade lasts and how clean it cuts.
It is worth asking: When was your machine last serviced? Are your parameters dialed in for this material? Is this the right blade geometry for what you are cutting? Could your operators use time with someone who runs these machines every day?
Flatbed Tools offers machine service, preventive maintenance, operator training, and workflow consulting. If something is not cutting right, reach out. We have probably seen it before.