When measuring the circumference of a Band Heater the measurement should be made on the inside surface from Point A to Point B whenever possible.  Also be sure to inform your customer service person of the gap size (space between Point A and Point B).

If  the heater cannot be measured then the barrel circumference should be measured from Point A around to Point A again to determine barrel circumference or barrel can be measured from Point B to Point C to determine Barrel O.D.

Also be sure to inform your customer service person of the gap size that is required.

Locating Holes by Part Feature and with Degrees or Clock Time

Hole Location

If hole Location cannot be determined in degrees, then measurements should be made on the inside surface of the heater. (A) from the edge of gap to edge of hole or (B) from the edge of gap to the centerline of hole.

Standard Gap Sizes

The standard gap width on a two piece heater is 3/16".

The standard gap width on a one piece heater is 5/16".

For heaters that are available for four hour shipment the maximum gap width is 1" for a one or two piece heater.

When a hole is on the centerline of the width of a heater the maximum hole size can be determined by subtracting 3/4" from the heater width.

When a hole is offset to one side of a heater there must be a minimum of 3/8" clearance from edge of hole to edge of heater on one side of the hole