iCrimp IWS-3220M Micro Connector Pin Crimping Tool 0.03-0.52mm² 32-20AWG Ratcheting Crimper for D-Sub,Open Barrel suits Molex,JST,JAE

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From the brand

Open Barrel Terminal Crimpers

iCrimp open barrel crimping tools are for crimping JST, Molex, Dupont and other similar style terminals. Making jump wires which are normally used to interconnect the components of a breadboard or other prototype or test circuit, internally or with other equipment or components, without soldering.
Open Barrel Terminal Crimpers

Product description

SN-28B open barrel crimp tool jst xh vh crimp tool dupont crimping tool

iCrimp SN-28B Dupont, JST Crimping Tool

SN-28B open barrel crimper tool is designed to crimp non-insulated open barrel, OEM-style terminals. Perfect for servo lead connectors and some other RC crimp connectors. This crimper features three (3) double crimp stations that simultaneously crimp the wire and insulation all in one action. To ensure a perfect crimp, the open barrel crimper will not disengage until a uniform crimp is completed or the quick release lever is trigger.

Applicable Chart

JST Series

VH 3.96mm Pitch 22-16AWG
RE 2.54mm Pitch 30-24AWG
EH 2.50mm Pitch 32-22AWG
XA 2.50mm Pitch 30-20AWG
XH 2.50mm Pitch 30-20AWG

Dupont

2.54mm Pitch

Application

Ideal for servo, drone, FPV, automotive & electrical wiring, SATA.
High quality ratcheting mechanism provides a stable platform for crimping.
Rechargeable battery packs
Battery balancers
Battery eliminator circuits
Radio controlled servos.
RGB LED decorative light strips
Seat wiring and actuation
Passenger service units
IFE (in-flight entertainment)
Electronic window shutters
Gallery

	SN-01BM	SN-28B	SN-48B	SN-2549
	Buying Options	Buying Options	Buying Options	Buying Options
Customer Reviews	3,730	3,730	3,730	3,730
Application	no data	no data	no data	no data
If Ratcheting	✓	✓	✓	✓
Capacity	AWG28-20	AWG28-18	AWG28-20	AWG28-18
Cavity	2	3	3	4

Product information

Technical Details

Brand	‎IWISS
Color	‎Grey, Orange
Item Weight	‎11.36 ounces
Product Dimensions	‎7.99"L x 3.27"W
Handle Material	‎multicolor
Grip Type	‎Ergonomic
Specification Met	‎Meets Industry Standards for a Crimping Tool
UPC	‎656664948785 701715365803
Manufacturer	‎ZHEJIANG IWISS ELECTRIC CO.,LTD
Part Number	‎28B
Item Weight	‎11.4 ounces
Item model number	‎SN-28B 28-18AWG
Is Discontinued By Manufacturer	‎No
Item Package Quantity	‎1
Usage	‎Rechargeable battery packs, Battery balancers, 3D printers, Radio controlled servos
Batteries Included?	‎No
Batteries Required?	‎No

Additional Information

ASIN	B00OMM4YUY
Customer Reviews	3,730 ratings 4.6 out of 5 stars
Best Sellers Rank	#31,765 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #83 in Crimpers
Date First Available	October 18, 2014

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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Customer reviews

3,730 global ratings

How customer reviews and ratings work

Customers say

Customers find the crimping tool makes perfect crimps and works well with Dupont pins, praising its solid construction and heavy-duty feel. The tool offers good value for money and excels at making secure connections, though opinions on connection quality are mixed. While some customers find it easy to use, others mention it takes practice to get right, and the hold pin mechanism receives mixed feedback.

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Quality Works well Value for money Crimping power Build quality Ease of use Connection quality Hold pin

458 customers mention "Quality"425 positive33 negative

Customers find the crimping tool to be of good quality, producing professional and perfect results.

"Great tool...easy to use...used for tiny connectors Molex IDE type for a Quad Copter....wires 30 gage....worked well after I did one test connector...." Read more

"Good quality and machining. Will work on jst xh connector if you remove the insulation side crimping jaws and grind/file them thinner...." Read more

"...The tool is well made and easy to use highly recommended for anyone working with electrical wiring!" Read more

"Great product! Very pleased with the tool! It Works for me! Thank you!!!" Read more

393 customers mention "Works well"359 positive34 negative

Customers find that the crimping tool works well, particularly with Dupont pins and connectors.

"Works great but it is a little hard to use. The head is too wide for the pins I am attaching. I have to be very careful about placement with these...." Read more

"...I now have one pair that works well and makes crimps even on tiny PH2.0 pins perfectly every time (if I align the pin right) These crimpers are..." Read more

"Used to crimp delphi .64 micro-pack terminals for a E40 ecm, worked great. Way better substitute than the $300 crimpers from the dealer...." Read more

"These work great. Took me a minuet to figure out how to use them properly but once I did Ive had no issues...." Read more

146 customers mention "Value for money"137 positive9 negative

Customers find the crimping tool offers excellent value for money, providing good quality for the price and saving them both money and time.

"I have been searching for this tool at this great price for at least a decade! Works great! I will never go without one again..." Read more

"...These crimping tools are well worth the money and will save you material, time, and frustration." Read more

"For the price it a good buy, it take a little finesse to use but able to do the job...." Read more

"Great Tool, good value, thank you." Read more

97 customers mention "Crimping power"78 positive19 negative

Customers find the crimping tool effective, with one mentioning it works well for small wiring projects and another noting it's particularly good for RC hobby servo connectors.

"...Handy tool for those who work with electronics. It wont be leaving my work bench anytime soon." Read more

"It is good for Dupont connector, but for other types like KF2510 or JST-XHP, I had to buy Engineer PAD 11." Read more

"Great tool to add to your tool box. Makes the perfect crips, both sides in one crimp instead of 2 like some others...." Read more

"Very useful tool at a fair price. Good quality with precision jaws." Read more

92 customers mention "Build quality"87 positive5 negative

Customers praise the crimping tool's solid construction, describing it as a heavy-duty JST crimp tool that feels good in hand.

"This is a really quality crimp tool, comfortable, solid and well balanced. It's kinda luxurious TBH...." Read more

"Crimper worked as described. Feels like very good quality and sturdy. Would definitely buy this brand again." Read more

"No wonder electronics have migrated to china. The product itself is well built, but in the end, it does a crappy job of crimping connectors well..." Read more

"...But it sure seems solid. Overall a great tool that reliably gets the job done." Read more

165 customers mention "Ease of use"103 positive62 negative

Customers have mixed experiences with the crimping tool's ease of use, with some finding it really easy to use and making the job easy to crimp, while others report that it is not easy to work with and takes some practice to get right.

"Great tool...easy to use...used for tiny connectors Molex IDE type for a Quad Copter....wires 30 gage....worked well after I did one test connector...." Read more

"Difficult to use. Maybe it's just me. But no beginner can use these. At least I couldn't." Read more

"Very easy to use and is very affordable. Tip: place the Dupont in the crimp area and then clamp it slowly...." Read more

"...This takes some practice, but once you get a system down it is easy, produces tight crimps that should not need solder. Well made." Read more

66 customers mention "Connection quality"40 positive26 negative

Customers have mixed experiences with the crimping tool's connection quality, with some reporting perfect Molex connections and good-looking results, while others note issues with specific connectors like JST red ones.

"Easy to use tool. Makes solid connections. Take look at YouTube and watch some videos on how people use it. It will make your life easier." Read more

"...works fine with Dupont terminals that are longer, but does not work with JST-XH connectors...." Read more

"Great wire tool and crimp connector." Read more

"The product is sturdy and makes clean connections. I wish there were a video on using the crimping tool with DuPont pins." Read more

51 customers mention "Hold pin"35 positive16 negative

Customers have mixed experiences with the crimping tool: some report very secure crimps, while others mention issues with the release mechanism, with one customer noting that the handles don't release automatically.

"...It worked great. Simple to use nice and secure crimp. While it may be something you don’t use often, it’s definitely nice to have." Read more

"...a few times until the tool holds it in place, which frees a hand to grab the wire and place it in to the connector while your other hand squeezes..." Read more

"...It is otherwise difficult to hold the wire in the proper position when crimping." Read more

"...function is the ratchet mechanism that allows for keeping the connector held snugly within the tool while working to properly thread in the..." Read more

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Top reviews from the United States

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J. Weiler
Kinda luxurious!
Reviewed in the United States on October 30, 2025
Model: SN-2549 0.08-1.0mm²Verified Purchase

This is a really quality crimp tool, comfortable, solid and well balanced. It's kinda luxurious TBH. It wont do all the work for you and it takes some practice and can be a bit fiddly at times to get the doohicky positioned in the right slot (story of my life) but then you squeeze and its perfectly crimped. As far as these things go it's top notch. This is one you can put in your will even if your only intent is to mess with your kids.

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Amazon Customer
Perfect Dupont crimps
Reviewed in the United States on November 2, 2025
Model: SN-025 AWG28-18Verified Purchase
After watching some YouTube videos, I am getting perfect Dupont crimps from AWG21 to AWG32. The trick is to close the insulation wings with needle noise pliers until the wings are nearly parallel to each other, hook then on the step of the crimper, and carefully ratchet the crimper until the jaws just hold the crimp in place. Then grab the wire a jaw thickness from its end, insert, and close the crimper completely, done.

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Ross
Great crimpers for JST
Reviewed in the United States on September 29, 2025
Model: SN-2549 0.08-1.0mm²Verified Purchase
Great crimpers, so long as you insert the connector correctly and i the correct size, the ratcheting action ensures that you will have a good crimp. Made working with JST connections a breeze!

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P. Meyer
Awesome crimps but takes time to master.
Reviewed in the United States on May 10, 2025
Model: SN-28B 28-18AWGVerified Purchase
I bought mine in 2021 and only used it a couple of times so I did not get enough experience until today when I started making wires in earnest.

Mine does not form the O crimp properly, that being the one at the insulation end of the connector. I am using 24ga silicone insulated wire which is very flexible, tinned and all around excellent. But this insulation is squishy and while the O crimp I think is intended to go around the insulation I cannot do that or the insulation squishes out and prevents the connector from sliding into its shield.

In fact it’s not an O crimp at all, it’s just a bigger B crimp. On mine that bigger B is malformed, I think because of a defect on the hammer jaw. (One jaw moves which I call the hammer and the other remains stationary which I call the anvil. The anvil forms the curves of both the O and B crimp except as I say they’re really both B’s).

The defect is in the casting and looks like it forms both an inclusion and a drop out which is to say one bit of it makes the channel smaller and the other bigger but these are by very small amounts. I think the malformation distorts the way the material flows in the die because one half of the O-which-is-really-just-a-bigger-B is malformed and the other isn’t. The top loop is squashed so the connector will not slide into the shield and requires fussing with pliers to get the shape right.

The only way I can get a usable crimp is by using the 28-24ga jaws, setting the connector depth as recommended, crimping it and then pushing the connector in farther so the O crimp is in the B hammer/anvil and crimping it again. This is done with insulation stripped far enough that it’s bare wire through both the O and B areas (about 5mm).

The resulting crimps are consistent, very strong and insert easily.

I have only used these on one vendors connectors (gikfun) which I got at the same time as this crimper and they’re excellent but they state in the listing they’re for 22ga wire (and I’m using 24ga). Mine had the same behavior with 22ga silicone wire, I just didn’t go far enough in testing to find out if the same double-crimp solves it.

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ofgg
iCame, iSaw ...
Reviewed in the United States on July 25, 2025
Model: SN-28B 28-18AWGVerified Purchase
iCrimp! A little tricky to get small connectors positioned. But seems to make a good solid crimp.

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ofgg

iCame, iSaw ...

Reviewed in the United States on July 25, 2025
iCrimp! A little tricky to get small connectors positioned. But seems to make a good solid crimp.

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One person found this helpful

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AmazonFox
The old adage is true -- use the right tool for the job.
Reviewed in the United States on January 5, 2016
Model: SN-28B 28-18AWGVerified Purchase
There's that old adage, "use the right tool for the job"; it definitely applies when working with wiring/electronics! I needed to replace connector pins on some solid-state circuit boards in a 1977 pinball machine, and thought I could go at it with carefully with needle-nose pliers. While I managed to get one or two pins crimped on the wire, it was something of a pain (ok, that's an understatement), it took quite a while, and I had little confidence in the sloppy finished product. When the realization hit me that I had at least 30 more of these to do, I decided to bite the bullet and find the right tool -- and this was it.

Some of these connector pins are small and not easy to handle, especially with larger fingers. In addition, unless you have three hands, it's a tricky process -- since you'd need to hold the pin, the wire, and the tool all at once. Not so, with this tool! It ratchets through its function, which means you can insert the pin in the jaws, and squeeze the handle to the first ratchet step -- so the jaws grab & hold the connector pin in place. This allows you to then feed/position the wire in with one hand, and squeeze the handles with the other to complete the crimp. And yes, it can be done -- or at least started -- with one hand. Once the crimp has begun (which holds the wire in place), you can then use two hands to complete the squeeze on the tool. When the crimp is complete, the tool automatically releases.

Also worthy of note: The tool has three different sizes built into the jaws, to accommodate different size wires/pins. Each jaw has a little 'step' to help you align the wire & sheath properly for an ideal crimp.

I finished all my connector pins in very little time, and all the crimps looked beautiful. All the updated connectors functioned flawlessly. I HIGHLY recommend this tool. Save yourself the headache, time, and frustration with crimping connector pins by getting the right tool for the job: IWISS Dupont Professional Pin Compression Ratcheting Modular Insulated Terminal Crimper Pin Crimping Tool 2.54mm 3.96mm 28-18AWG 0.1-1.0mm2 with Wire-electrode Cutting Die

Read more

AmazonFox

The old adage is true -- use the right tool for the job.

Reviewed in the United States on January 5, 2016
There's that old adage, "use the right tool for the job"; it definitely applies when working with wiring/electronics! I needed to replace connector pins on some solid-state circuit boards in a 1977 pinball machine, and thought I could go at it with carefully with needle-nose pliers. While I managed to get one or two pins crimped on the wire, it was something of a pain (ok, that's an understatement), it took quite a while, and I had little confidence in the sloppy finished product. When the realization hit me that I had at least 30 more of these to do, I decided to bite the bullet and find the right tool -- and this was it.

Some of these connector pins are small and not easy to handle, especially with larger fingers. In addition, unless you have three hands, it's a tricky process -- since you'd need to hold the pin, the wire, and the tool all at once. Not so, with this tool! It ratchets through its function, which means you can insert the pin in the jaws, and squeeze the handle to the first ratchet step -- so the jaws grab & hold the connector pin in place. This allows you to then feed/position the wire in with one hand, and squeeze the handles with the other to complete the crimp. And yes, it can be done -- or at least started -- with one hand. Once the crimp has begun (which holds the wire in place), you can then use two hands to complete the squeeze on the tool. When the crimp is complete, the tool automatically releases.

Also worthy of note: The tool has three different sizes built into the jaws, to accommodate different size wires/pins. Each jaw has a little 'step' to help you align the wire & sheath properly for an ideal crimp.

I finished all my connector pins in very little time, and all the crimps looked beautiful. All the updated connectors functioned flawlessly. I HIGHLY recommend this tool. Save yourself the headache, time, and frustration with crimping connector pins by getting the right tool for the job: IWISS Dupont Professional Pin Compression Ratcheting Modular Insulated Terminal Crimper Pin Crimping Tool 2.54mm 3.96mm 28-18AWG 0.1-1.0mm2 with Wire-electrode Cutting Die

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107 people found this helpful

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Top reviews from other countries

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Nicole
Fantastic Crimping Pilers!
Reviewed in the United Kingdom on August 5, 2023
Model: IWS4 AWG14-10Verified Purchase

Work perfectly on TE Connectivity Open Splice Barrel Crimps! Extremely well priced.

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WRX S4
ギボシ端子圧着ペンチ
Reviewed in Japan on January 28, 2025
Model: SN-48B AWG26-16Verified Purchase
容易にギボシ端子の圧着が出来ます。
圧着後の仕上がりも綺麗に出来ます。

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peter
Value for the money
Reviewed in Canada on March 11, 2025
Model: SN-2549 0.08-1.0mm²Verified Purchase
As described by seller. Product was quality built and versatile as it can crimp several styles of connectors. I would recommend

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radio boy
コネクタ圧着の成功率が高まり、満足
Reviewed in Japan on December 4, 2024
Model: SN-2549 0.08-1.0mm²Verified Purchase
アマゾンのレビューはいつも半信半疑ですが、価格も高くはないので購入してみました。結果、今までXHやデュポンコネクタは中国駐在時に購入した工具で圧着していて失敗が多かったのですが、この工具にしたら圧倒的に失敗が減りました。ダイスの作りも以下まで使っていた工具よりだいぶ良さそうに見えます。少なくともホビー用途なら（わたくしはホビーユーザーです）十分に満足できると思います。

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Amazon Customer
Excelente
Reviewed in Mexico on April 24, 2017
Model: SN-28B 28-18AWGVerified Purchase
Muy buena herramienta
Cumple sus especificaciones técnicas
Buenos engastes en terminales y calibres pequeños

Fue buena compra y buen precio

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