Will this be ok for trex/composite?

Yes, this will work with those materials.

what size do I need to screw 2by4?

When working with a 2X4 that is 1 1/2" thick you will want to use the 2 1/2" length screws.

Will these work to edge join 5/4 deck boards and can i use the foreman to drill the holes or do i need the HD jig?

For 1" thick lumber, you will want to use the 1-1/2". The Foreman does not have a setting for 1". You could use the 3/4" setting and the 1-1/4" screw and you will still get a good strong joint.

the picture says 1 1/4, are these 1 1/2 or 1 1/4?

Mine say 1 1/4 inch and that's what they measure. The page you are looking at shows where you can order 1 1/4 or 1 1/2 inch sizes, but in my experience the size on the box is the length of the screw.

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Kreg SML-C150B-100 Blue-Kote WR Pocket Screws - 1-1/2-Inch,

ID del producto: 275098852

Transacción segura

Detalles

Material
case hardened
Drive system
Square
Head style
Square
Item dimensions L x W x H
5.1 x 7.6 x
Exterior finish
Alloy Steel

🌲Coarse threads for softwoods

🔩1.5-inch precision length

🛠️Case hardened steel strength

Descripción

🔧 Screw it right, screw it tight — join like a pro!

BLUE KOTE FINISH - Corrosion-resistant coating for long-lasting outdoor and indoor projects
TIGHT POCKET HOLE FIT - Flat bottom head and smooth shank ensure a rock-solid joint every time
SLIP FREE SQUARE DRIVE - Engineered to prevent bit slipping for flawless, fast assembly
OPTIMIZED THREAD DESIGN - Coarse threads grip softwoods and composites like pine, MDF, and plywood with ease
DURABLE CASE HARDENED STEEL - Built tough to resist bending, snapping, or breaking under pressure

The Kreg SML-C150B-100 Blue-Kote WR Pocket Screws are 1.5-inch, case hardened steel screws with a slip-resistant square drive and coarse threads designed specifically for softwoods and composite materials. Featuring a corrosion-resistant Blue-Kote finish and a flat bottom head for tight pocket hole joints, these screws deliver durable, professional-grade fastening for woodworking projects both indoors and outdoors.

Presupuesto

Manufacturer	Kreg
Part number	SML-C150B-100
Item Weight	277 g
Product Dimensions	5.08 x 7.62 x 12.7 cm; 276.69 g
Item model number	SML-C150B-100
Finish	Blue-Kote
Material	case hardened steel
Shape	Cylindrical with helical thread
Item Package Quantity	1
Number Of Pieces	100
Head Style	Square
Batteries Included?	No
Batteries Required?	No