The PA-09 is often recommended on here as actually having good dies, but it's non-ratcheting, requires two squeezes (one for wire, one for insulation) and also lacks the round insulation crimp. There's also an SN-2549B that's basically an SN-28B with a bit of an SN-01BM grafted on. I don't have one of these, but they look like they'd do a better job, having the thinner jaws. (For what it's worth, the SN-28B is great for 2.8/4.8/6.3mm spade connectors onto thinner wires, like 24-16AWG (0.22-1.5mm².) SN-01/2/3BM (and a few others) are sold as D-sub crimpers for various wire gauges. For Molex KK (and their Chinese clones, the KF2510), the 28B actually isn't tooo bad, since they're designed for F-type insulation crimps. (Slightly re-crimping the insulation crimp in the wire half of the die will make it work.) But the dies are actually too thick (7mm), so with many Dupont contacts, it's extremely hard to get a proper crimp without mangling some part of the contact. It always mangles the insulation crimp, making it too wide to insert into the housings without extra work. The SN-28B's smallest die does work for Dupont, sorta. (I found this in a big-name toolmaker's catalog, I just forget whose!) The SN-48B is categorically too big for Dupont, etc. I finally figured out where the SN-28B and SN-48B got their model numbers: they're designed for 2.8mm and 4.8mm wide spade terminals, respectively. All of those crimpers, on the other hand, are designed for the "F" type crimp (which resembles an "m") on both the wire crimp and the insulation crimp. Dupont contacts have the two diagonally meshing insulation crimps which are intended for a circular crimp which does not penetrate the insulation. All of these get sold online as being suitable for Dupont, yet in fact none of them truly are. The vast majority of us hobbyists seem to end up with one of a few different tools for "Dupont" pins and other small connectors: - SN-28B, -BM - SN-48B, -BM - SN-01BM, -02-BM, -03BM - Engineer PA-09 Let's review these all first. So I've spent a lot of time over the past few years trying to understand the world of cheap crimping tools, and it's daunting to say the least. But here in the real world, at least for hobbyists, spending $300-1000 per tool is just not realistic. In an ideal world where each of us had literally unlimited funds (and unlimited workshop space), we'd just exclusively buy first-party terminals and the official tooling for each type. So, as we know, the world of crimping (especially with small connectors) is fraught with "gotchas" and half-truths, as well as inherent complexity.
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