40 mm Wood Screws | McMaster-Carr

Filter by

System of Measurement

Screw Size

Thread Size

Fastener Head Type

Tip Type

Threading

Material

Thread Length

Drive Style

Head Width

Thread Pitch

Specifications Met

For Use In

Tapping Method

Head Height

REACH

Finish

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Sold As

Individual

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

RoHS

Diameter

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