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Truss Head Square Drive screws are flat under the head to provide maximum bearing area and have a lower profile than pan heads. Use them when you don’t want the screw head to sink into the wood.#6 Truss Heads use deep threads Clear Zinc Plating. Made in USA /Canada/Taiwan. #2 Combo Recess.
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I use these all the time
By SueNH
from Seabrook, NH
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Comments about #6 x 1/2'' #2 Combo Truss Head Zinc Screws:
I use these all the time to attach the tops and bottoms of Lazy Susan's to the mechanisms I use. They are perfect for that application.
(2 of 2 customers found this review helpful)
not-flat head screw
By sqaure drive fan
from Midwest USA
The #8 and #10 pan heads are very good screws, but I'm very disappointed with the #6 pans (called "truss" because they're flatter). The actual screw is not at all like the drawing/rendering ---- it's missing all the features that make a pan head useful (such as attaching thermostats, low-voltage controls or lights; metal boxes; panels and enclosures; undercabinet lights; adjustable hardware...anything where you can't have the flared head of a regular screw).The shank should come up to the head as a cylinder, but instead it starts to flare out like a wood screw. Obviously it doesn't flare the whole way, but it's over half the head diameter A pan/truss screw is supposed to be flat on the bottom! Second, around the head on the bottom there is a chamfer/"bulge" (like there's should be) but it's disproportionately large. With these flaws combined, the underside of the head is not flat thus has little bearing area. For some diameters: the shank is 0.095", the flare ends at 0.170, the chamfer starts at 0.253 and the head is 0.315. So the flat surface area between the flare and chamfer is 0.0276sq-in compared to the roughly 0.0708sq-in possible: only 39%.By comparison, a #10 pan has shank, chamfer, and head diameters of 0.130, 0.320, 0.360. The flat area under the head is 76% of theoretical maximum; much better. #8s: 0.120, 0.282, 0.310: flat area is 79%.Bottom line: if you want a screw with a flat-underside, bump up to #8 or larger. Unfortunately, the shortest 8 is a 5/8", which is too long for most undercabinet work, so for me, it's back to buying hardware store hard-to-drive slotted-head pan screws :( ....