Hilti KB3 vs KB-TZ

There are some tid-bits scattered around the site about the KB-TZ, and lots of positive reviews on the KB3. However I was curious if anyone had some more in-depth insight regarding the pros-cons of the KB3 vs the KB-TZ?

kennyp wrote: There are some tid-bits scattered around the site about the KB-TZ, and lots of positive reviews on the KB3. However I was curious if anyone had some more in-depth insight regarding the pros-cons of the KB3 vs the KB-TZ?

In terms of use, I haven't found any meaningful difference. I feel like the KB3 are slightly easier to tap into the hole, but that could just be in my head. TZ is rated for seismic and cracked concrete, 3 is rated for untracked concrete. The TZ seems to have a slightly longer collar, that is a little tighter on the cone. 

if you look at the specs, TZ are rated as being slightly weaker. 

I have a slight preferenece for the KB3, but use them interchangeably

EDIT: The specifications for KB-TZ give two different values for the strength of the anchor itself. On pg 296 Table 17 "Steel Strength..." it gives values of 4,475lb (19.9kn) tensile and 3,070lb (13.7kn) shear. HOWEVER, on page 287 it gives minimum bolt fracture loads as 6,519lb (28.9kn) tension and 5,058 (22.5) shear.

The specs for KB3 and TZ are reported in slightly different tables, and I don't see any tables that fully align to actually compare Stainless KB3/TZ. Thanks Kenny for making me look at this again.  

I've also had this same question lately. The KB3's are cheaper and more available in 304, and I wonder if the TZ's are really worth the extra price for 316. I've been holding off purchasing any more wedges until I hear more opinions. What's everyone using out there?

ERRAND WOLFE wrote:

I've also had this same question lately. The KB3's are cheaper and more available in 304, and I wonder if the TZ's are really worth the extra price for 316. I've been holding off purchasing any more wedges until I hear more opinions. What's everyone using out there?

Perhaps ask the question, "Is the additional expense of 316 necessary or cost-effective for my climbing area?" Once that is answered the choice is KB3 or KB-TZ, since both are available in 304 and 316. 

I was using Redhead "TruBolts" 304 SS in semi-arid mountain granite. Bolts placed in the early 1990s still look like new. I have switched over to Hilti KB3, 304 and 316. Mostly 3/8", with 1/2" for crux bolts and belay/rappel anchors. Hilti has ridiculously high retail prices. Shopping eBay and Craigslist turns up some huge savings. My preference is to use 316 SS. Perhaps a waste of some money, but a potentially longer lifespan. No complaints about the TruBolt, but the KB3 has some improved features. The bottom edge has a bevel which may help guide it straight into the hole and without carving debris along the sides of the hole. The lip above the collar seems better designed to decrease the potential for the collar to ride up over the shaft when hammering into the hole (rare, but it has happened a couple times). The finish and passivation appear better. Have yet to encounter a problem with quality control.

The recent eBay deal on 3/8" x 3" KB-TZ 316 was a steal, though I have yet to place one. I don't see any advantage/disadvantage of KB3 vs. KB-TZ for climbing purposes.