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ADI-4, 4" Austempered Ductile Iron (ADI) Bench Vise

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Product Description

The Austempered Ductile Iron (ADI) series of professional grade bench vises is constructed out of 130,000 PSI Tensile Strength Austempered Ductile Iron and is at least 45% stronger than the Yost FSV (forged steel) vise series. ADI castings are (1) continuous cast, precision machined, whereas the FSV series was forged then welded together. The ADI line of vises is equipped with replaceable machinist and pipe jaws. Adjustable hardened guide rails provide smooth, precise operation. The durable powder coat finish provides a professional finish that helps prevent damage from weather. The ADI base features two lockdowns for a tight grip.


  • 130,000 PSI Tensile Strength Austempered Ductile Iron (ASTM A897; 900-650-9, Grade 900)
  • Zinc Plated Handle and Lockdowns for increased corrosion resistance
  • Replaceable hardened steel serrated Machinist and Pipe Jaws, zinc plated
  • Large anvil work surface
  • Adjustable guide rails for smooth operation
  • Interlocking (geared) 360° Swivel Base with two lockdowns
  • ADI base with three mounting holes

Additional Information

Model # ADI-4
Item # 20004
Jaw Width (nominal inches) 4"
Jaw Opening (nominal inches) 5"
Throat Depth (nominal inches) 2.9"
Min Pipe Capacity (nominal inches) .5"
Max Pipe Capacity (nominal inches) 2"
Base Swivel 360°, interlocking gear base, (2) lockdowns
Material Austempered Ductile Iron
NSN -
Packaging Dimensions 14" x 7" x 7"
Shipping Weight (lbs) 22
Country of Origin China
WarrantyDownload
Vise - IsometricDownload
Vise - LayoutN/A
Base PrintDownload
Serrated Machinist JawsN/A
Serrated Pipe JawsN/A
Owner's ManualDownload

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J
John Smith
Best vise ever!

The Yost ADI4 is absolutely the best vise I have ever had, or even used. Don’t wait until you are nearly 70 to get one, though I am still glad I did. Their description does not do it justice.
I was looking on line for days for a fixed vise (finding only used ones) because it is so easy for rotating ones to slip, and even if it doesn’t let go of the work, it isn’t holding the work in position. I’ve wasted a lot of time in workarounds, and alterations, with only moderate success. Even some expensive ones bragging about solving the problem ended up saying “less motion”. The ones with indexing probably hold, but none was general purpose. Other problems have been broken castings, anvils that dent from nothing much, jaws that won’t grip without crushing, etc.
Finally saw this Yost vise, with the “geared base”—it’s actually toothed, like a checker, with matching teeth on the gripper bar. Cast teeth, so it won’t be as precise as indexing, but it’s fine—AND IT HOLDS! Without any exceptional torque on the locks—The little slide rod, by hand, works just fine. (Others I have switched to a nut to use a socket wrench, and maybe a breaker bar, and it’s still maybe on the hold).
During the looking I became aware of the strength issues—few vise makers mention the 30K Psi cast iron, 60K PSI ductile iron, or this—austenitic tempered ductile iron, 130K PSI, stronger than many steels. I can’t test it independently, but I can say I haven’t made a mark on the anvil. I could see, because you could easily see it in the slight milling marks. (That’s not careless machining, it’s a better work surface than polished would be.)
The action is just beautiful. Yost mentions the machined rails on the moving jaw, and the adjustable guide. It came well adjusted, and it runs smoothly, and the jaws stay parallel. I didn’t see mention of the screw, but it’s also well done. This has a heavy jaw, and I can spin it with my index finger. I can flick the rod with my finger, and the momentum can provide enough force to hold the work enough to check alignment. You are not putting effort into fighting the mechanism—almost all the effort is going into the job. You won’t need to call the gorilla temp service, or use a persuader bar, or hammer on the slide rod.
Best of all, because it is properly aligned, you don’t need to crush the work to hold it. It’s not loose on the left when it’s tight on the right—that’s what demands the extra force.
Nice fast screw—each turn moves it ¼ inch. I wondered if it was too fast, but again, you don’t need that much torque—spin it with a finger, and ordinary hand pressure to tighten it.
I wondered if the hatching on the jaws was too aggressive, but Yost was right again. They didn’t leave the sharp cutting edges some vises have. Also, it doesn’t need that much pressure.
From the picture online, the pipe jaws seemed long, and not very wide, and I wondered if they were steady enough. I didn’t have a job for them, so I clamped my X-type lug wrench in it. Gripping a small diameter, with two sizable lever arms, it felt fine. I didn’t try to beat it, but I did try to use more force than I’m likely to use working.
I got this one for my son. I’ll be moving, and now I don’t have to debate moving any vises. They get sold or scrapped, and I get another one of these when I set up my next shop.