CSI recognizes three sizes of tables and playing surfaces as regulation (all ±1/16”):Table Size Playing Surface3 ½’ x 7’ 40” x 80”4’ x 8’ 45” x 90”4 ½’ x 9 50” x 100”
The height of the top of the playing surface measured from the floor will be 30”, ±½”.The playing surface is measured by straight lines from cushion nose to cushion nose of the opposite side, and perpendicular to the cushions.
The height of the cushion nose measured from the playing surface will be 129/64”, +1/64” or –1/32”.
The center of all diamonds will be 311/16” from the cushion nose (no tolerance).
Corner pockets: 4½”, ±1/16”. Side pockets: 5”, ±1/16”. CSI measures pocket openings by the “gate method” rather than the traditional method of measuring between the tips of the cushions. If a ball entering the mouth of a pocket contacts the cushion within the mouth, it does so at a point well below the cushion nose. The gate method provides a more accurate measurement of a pocket opening based on the true action of a ball entering the mouth of the pocket.An easy and proper way to measure a pocket using the gate method is shown in Figure ES-2. Using two new striped balls, place the balls in the mouth of the pocket with the stripes facing up and lined up. Set them so that each ball touches the vertical cut of the cushion and so that a line extending across the mouth of the pocket from cushion tip to cushion tip bisects the stripes lengthwise. Note that the balls do not touch the tips of the cushion, but instead contact the cushion at a point below the tip.When properly placed in corner pockets the balls will.
1. be just touching each other – a pocket opening of exactly 4½”, or;
2. have a gap of up to 1/16” between them (tolerance to 49/16”), or;
3. require slight compression into the cushions to place as described (tolerance to 47/16”).
If the gap between the balls is more than 1/16” or the pocket opening is too narrow to place them easily as described, the pocket opening does not meet CSI specifications.When properly placed in the side pockets the balls should have a gap of ½” between them. If the gap is less than 7/16” or more than 9/16”, the pocket opening does not meet CSI specifications.
The horizontal interior angles of the cushions at the pockets will be 141° ± 1° at a corner pocket and 100° ± 1° at a side pocket. The vertical cushion angle within the mouth of all pockets will be between 12° and 15°.
CSI measures shelf depth in relation to the dimensions of a ball. Figure ES-4 shows how shelf depth is determined.
All balls will have a diameter of 2¼” ± .005”. The weight of the balls will be between 5½ and 6 ounces, but all object balls used in any match must be of equal weight. Slight variations in the weight of the cue ball with respect to the object balls may occur depending on the type of the cue ball.
a. The width of the cue tip must not exceed 14 millimeters. There is no minimum width.b. The weight of the cue must not exceed 25 ounces. There is no minimum weight.c. The length of the cue must be at least 40 inches. There is no maximum length.d. The cue tip must be composed of leather, fibrous, or pliable material.
The primary consideration for determining whether a mechanical bridge is legal is that it supports the cue, as opposed to elevating the bridge hand above the bed of the table or significantly enhancing the stability of the hand holding the bridge.The particular construction of the bridge is not relevant as long as it does no more than support the cue, and does not damage the table or other equipment. Items that are not considered disqualifying include, but are not limited to:
1. The overall size, or the height of grooves above the bed of the table;2. whether there is a handle, sliding extensions, wheels, or accommodations to straddle balls;3. the shape of grooves;4. whether the grooves have linings or mechanisms to retain the cue in the groove.
If the above information is not sufficient to determine to whether a particular bridge design is considered legal, please contact the CSI National office, and include a picture of the bridge in use on a table with your communication.