

🔧 Master every flare, own every line — precision that fuels your pro edge!
The Mastercool 71098 37° Flaring & Double Flaring Adapter Set is a professional-grade kit designed for precision flaring of 3/16” to 1/2” tubing. Compatible with Mastercool’s hydraulic flaring tools, it delivers leak-free, SAE J514 and ISO 8434-2 standard flares ideal for automotive, racing, aerospace, and HVAC applications. Constructed from hardened alloy steel, this durable set includes 5 die sets and matching adapters, backed by decades of U.S.-based expertise and support.




| ASIN | B002YKNXKS |
| Best Sellers Rank | #175,051 in Automotive ( See Top 100 in Automotive ) #73 in Brake Repair Brake Flaring Tools |
| Brand | Mastercool |
| Color | Silver |
| Connector Type | Flare |
| Customer Reviews | 4.6 4.6 out of 5 stars (209) |
| Date First Available | March 15, 2007 |
| Exterior Finish | Aluminum |
| Global Trade Identification Number | 00700376710984 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2 pounds |
| Item dimensions L x W x H | 12.75 x 3.75 x 3.25 inches |
| Item model number | 71098 |
| Manufacturer | Mastercool |
| Manufacturer Part Number | 71098 |
| Material | Alloy Steel |
| Model | 37 Degree Hydraulic Flaring Tool Adapter Set |
| Number of Pieces | 37 |
| Product Dimensions | 12.75 x 3.75 x 3.25 inches |
| Size | 37 deg. Flaring & Double Flaring Adapter Set |
| Thread Size | 3/16", 1/4" |
| Thread Type | Metric Tapered |
| UPC | 700376710984 |
B**N
Makes Perfect 37 Degree JIC flares
Man, I use the heck out of these things! I bought them as an add on to complete my Mastercool flare kit. These things are great quality, never slip on the hard line and work on Aluminum, CuNi, steel, and even really hard Stainless steel. Prettiest flares you've ever seen! Just remember to put the nut and sleeve on first... and face the sleeve in the right direction too.. Lol...
D**O
Itemized dies parts# with details about kit
I bought this kit to add to my 45 degree kit so I can also do 37 degree flares but I noticed you only need square dies and the 37 degree cone the silver plunger for all the sizes is the same 45 degrees plunger die that comes in any 45 degree set The silver plungers are 45 degrees (as shown in picture) The cone is 37 degree And all the square dies are 37 degrees (as shown in picture) So if you already have a 45 degree set you only need the 37 degree cone and the 37 degree square dies for whatever size you plan to do. Picture with all part numbers This kit fits any hand hydraulic. The kit is priced decently Quick and easy to make 37 degree flares It functions as any 45° set, just for 37 degrees Fast and easy to use
P**T
Great tools!
Great tools, I just wish there were slots provided in the case of the complete tool set , for these to be stored in. If not, then for the price there should have been a comparable blow-molded case for the extra dies. C'mon guys, a little common sense goes a long way here. Great tools, but you let us down on the storage aspects. Gotta protect my pricey tools! Got it?
S**8
Very nice addition to the Mastercool 45 degree set
I have the Mastercool 45 degree set and started working with AN fittings. AN fittings are 37 degree not 45 degree. Was pleased to find that all I needed was a die set. I tried out the 5/16 and 3/8 dies and they work great.
W**A
Lowrider suspension or hydraulic lines in general
Works great on ss making hydraulic fittings. 37 degrees. Doesn't come with the hydraulic hand machine but I already had that tool.
P**D
but I'm very pleased with the quality and fit and finish of these ...
Wish these were offered as part of a larger set , but I'm very pleased with the quality and fit and finish of these fine American made tools. Mastercool has simplified and perfected the art of making a correct flange! Thanks for a fine product Mastercool !
Z**R
Nice set
Perfect 37deg flares ever time
C**K
Pretty good quality tool
Pretty good quality tool to use for doing Aircraft style flairs. only bitch i have is that they dont come in there own case. they are individually packaged and if you dont dedicate a spot for them in your tool box you could lose them. I would sweriously hope that at some point the design a blow moulded plastic case to store these fine tools.
G**N
Took awhile to get here but great tools from mastercool. I stripped the bubble (clamp) dies trying to do 3/8 stainless. It was .49 wall and way too thick. Should be able to handle .28 stainless. The does still work but leave marks on tubing now. Guess we’ll see how there warranty is.
G**E
The Mastercool kit is an addition to my existing Mastercool tools - brilliant tools to give a perfect finished result. The exceptional bit is that Amazon Prime facilitated getting this kit from Texas to Melbourne, Australia in four days and at a VERY good price! Amazon Prime has opened up a trustworthy international buying avenue for me I did not know existed. Well done.
A**R
The actual tool was and worked as expected, it did a great job flaring hydraulic lines to connect to jic fittings. The only down side is that there is no case for all the pieces and there is no place to put them in the master set. So a case included would be a great asset
C**.
Big assortment of dies great for making hard lines for hydraulic applications
S**I
You would think you are buying a top line tool and paying this much for it you would have a box to store it in. I have the full set with the press and everuthing but there is no room to put these in it and the item doesnt come with a molded case or anythig. Non even available to pirchace separatley. These are not cheap so you want to have a storage made for them. Good job mastertools 🙁
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