Quantity used per hatch:
• 9-5/8" x 9-5/8" 1 each
• 12-3/8" x 12-3/8" hatch: 1 each
• 18-3/16" x 18-3/16" 2 each
• Trapezoidal 2 each

• Length, on lid: 4"
• Fastener location on lid, center to center (drilled and tapped):
    edge to hole 1: 1/4";
    hole 1 to hole 2: 1-1/8";
    hole 2 to hole 3: 1-1/4";
    hole 3 to hole 4: 1-1/8";
    hole 4 to edge: 1/4"

• Length, on frame: 2-15/16"
• Fastener location on frame, center to center (clearance holes, no threads, only two holes used when not at the seam):
    Edge to hole 1: 3/8";
    hole 1 to hole 2: 1/2";
    hole 2 to hole 3: 1-1/16";
    hole 3 to hole 4: 1/2";
    hole 4 to edge: 3/8"

• All dimensions are approximate and may vary slightly from hinge to hinge.
• Fasteners: six flat head Philips 10-32 x 3/8" (included).

Although the overall dimensions seem to be the same as earlier versions of this hinge, the hole pattern for the fasteners into the frame have been reported as different, making them difficult to use without modification. Double check the measurements to make sure these will work for your hatch before ordering.