Question: Is the MaxJax really safe?
Answer
Absolutely. If you compare the number of people killed or injured annually using floor jacks or jack stands to other car lifting solutions, it’s evident that the MaxJax provides increased safety when installed and operated properly.

If you've ever visited a service garage, dealership or fleet repair business, it’s easy to see that two-post lifts are the lifts of choice among professionals. In fact, the Automotive Lift Institute reports that out of the thousands of car lifts sold monthly, and among the many lift configurations available, two-post style lifts represent well over 63% of the market.

Two-Post Lift in Garage

Let’s be clear—the MaxJax is not just a hobby lift. It too is a “real” lift.  It’s built by our team of qualified engineers that not only designed the MaxJax, but also our family of full-sized lifts. We’ve got years of experience and we’ve done our math. While most car enthusiasts are talking about 4-bolt mains, our engineers are studying applied force, axial force, bending moment, center of gravity, concentrated load, deflection, deformation, distributed load, ductility, elastic limit, moment, normal strain & stress, potential energy, sheer strain, strength, yield stress, yield strain and so on.


Question: What keeps it from tipping over – there’s no top crossbar?
Answer
The concrete anchors actually secure the lift to the floor and keep it from tipping over. And, believe it or not, this is the way that most two-post lifts do it. The top crossbar found on most commercial two-post lifts is not intended to be load bearing. It’s just a simple, elegant way to route the equalizing cables and hydraulic hoses. Although clear-floor style two-post lifts do have a crossbar, many popular floor-plate or base-plate styles are void of one.

Car Lifts Two-Post Styles Dannmar


Question: How strong are the anchors? Are they really safe?
Answer

 

Yes, your safety is number one on our list of priorities! We’ve done the longmath and tested the design and application very thoroughly. Here, we’ll even peel back the curtain and let all you engineer types see our work.

 

  • fp = 0.7 x fc
  • e = M/P
  • f1 = fp x B x N1 / 2
  • A = f1+/-(f12 - (.667 x fp x B) x (PA1+M)).5 / (fpxB/3)
  • T = (fp x A x B / 2) - P
  • T per bolt = T / # bolts
  • Safety Factor = Ultimate Bolt Strength / T per Bolt

 

Test Parameters:

 

  • Fc = 3000PSI (strength of concrete)
  • Test weight = 6,000 lbs.
  • Anchor/bolt rated strength (each) = 12,580 lbs.

 

Results:

 

  • (P) Forward anchor bolt tension load (each) = 977 lbs. (Two bolts)
  • (P) Forward anchor bolt compression load (each) = 3383 lbs. (Two bolts)
  • (T) Rear anchor bolt tension load (each) = 3238 lbs. (Three bolts)

 

Physical anchor testing:

 

  • Anchor/bolt actual destruction strength (each) = 20, 806 lbs. average

 

MaxJax Safety Engineering