Question 1

Where these screws made? Thanks.

Accepted Answer

Presumably somewhere on the plant earth. If you are buying these for installing draw slides, they work great and do not interfere with the operation of the slide. So, I would continue buying them even if they came from mars. Screws I have found at the local home improvement stores do not work properly with draw slides. If you are buying them for something else, then caring if it is Pennsylvania steel, Indiana steel, or overseas might be a legitimate question. Unfortunately I do not know what city they come from.

Question 2

Is predrilling required?

Accepted Answer

Predrilling is not required for most wood applications, but I would recommend it to reduce possibility of splitting.  The screw tips are adequately sharp so that installaion without predrilling is possible, at least with a screw gun or drill.  Installation with a screw driver, manually, might be more difficult, especially in hardwoods.

Question 3

can these be used under thin set mortar?

Accepted Answer

These are wood screws that are not meant to be counter sunk. They are zinc not stainless steel. Not sure why you are covering up wood with thin set. Why not use Hardiboard in place of wood and Hardi screws and then cover in Thinset?

Question 4

I will be attaching poles to a half-inch thick wooden fence using metal U-brackets. Are these screws suitable?

Accepted Answer

Screws are probably fine depending on what's attached to those poles.  They're indoor cabinet screws though so they will likely rust very quickly and don't have a very large head.

If it's treated pine pickets they will corrode into nothing very quickly.

Pickets are not structural building materials though.  Regardless of what screw you use,  they will likely pull out iif those piles have any load.

Id probably  use a pan head,  zinc coated,  sheet metal screw.  Not these

ASIN	B01MFAIS08
Best Sellers Rank	#78,273 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #618 in Wood Screws
Brand	Rok
Color	Zinc
Compatible Groove Diameter	0.16 Inches
Customer Reviews	4.7 4.7 out of 5 stars (2,386)
Drive System	Phillips
Exterior Finish	Zinc
Fastener Size	No. 8
Fastener Type	Wood Screws
Finish Types	Zinc
Head Type	Truss
Item Diameter	0.16 Inches
Item Weight	0.01 Ounces
Manufacturer	Rok
Material Type	Steel
Metal Type	Zinc
Model	ROKS8X12TPSZ-100
Number of Pieces	100
Part Number	ROKS8X12TPSZ
Screw Head Style	Truss
Screw Point Style	Type A Point
Set Screw Thread Type	Unified National Coarse (UNC)
Size Name	1/2 inch (12.7mm) Length
Thread Class	UNC
Thread Coverage	Fully Threaded
Thread Size	#8
Thread Style	Pan
Thread Type	Un
UPC	600346737655 793610298898
Unit Count	100 Count

100 Pack Rok Hardware #8 x 1/2" (12.7mm) Standard Thread Truss Head Screws Wood Work MDF Zinc, ROKS8X12TPSZ

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