40 mm Wood Screws | McMaster-Carr

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7 Products

Steel Hex Head Wood Screws

Often used on posts and beams, the coarse threads on these screws dig in for a firm hold. The hex head's six contact points keep sockets in place to avoid slipping and stripping the drive. To tighten, use a wrench or six-point hex socket. Also known as lag bolts.

Drill a pilot hole slightly smaller than the screw to prevent splitting. Length is measured from under the head.

Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.

	Tapping Method	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel







	M5 × 2.2 mm

	40	3.5	Partially Threaded	Thread Forming	DIN 571	50	97498A115	000000




			M6 × 2.6 mm

			40	4	Partially Threaded	Thread Forming	DIN 571	50	97498A124	00000




					M8 × 3.6 mm

					40	5.5	Partially Threaded	Thread Forming	DIN 571	25	97498A138	00000




							M10 × 4.5 mm

							40	7	Partially Threaded	Thread Forming	DIN 571	10	97498A155	0000




									M12 × 5 mm

									40	8	Partially Threaded	Thread Forming	DIN 571	10	97498A171	00000

Wood Dowel Pins

The choice for joining wood components, these pins won’t scratch or damage surfaces. They expand for a tight fit when glued.

Wood

	Pkg.
Wood







	6 mm Diameter

	40	100	97195A138	00000




			10 mm Diameter

			40	100	97195A149	0000