![]() The thread standard also defines the tolerance for the gauge length. This location may also be referred to as “Gauge Plane”. ![]() ![]() The gauge length is an arbitrary distance for the thread’s end at which the measurements of diameters are made. Gauge Length: Because of the taper angle, the diameters ( major, minor, and pitch) change as we move along the thread’s axis.BSPT Profile Drawing Symbolsĭefinition of parameters that are used for tapered threads The only difference is that in R & Rc series, the profile is tilted by the tapered angle (relative to the thread axis). The basic profile of the 3 sub-groups is identical. BSPT Rp – Internal parallel (To be used with BSPT R).BSPT Rc – Internal Tapered (To be used with BSPT R).BSPT R – External Tapered (Can be assembled with both Rc & Rp internal threads).You can view the Inch translation of all the dimensions in the BSP Thread Calculator Therefore all our below charts are in millimeters. Depending on the application, it can be used with or without a thread sealant.Įxcept for the nominal pipe thread, which is listed in Inch fractions, all the dimensions are defined in millimeters. The taper on BSPT threads allows them to form a seal when torqued as the flanks of the external and internal threads compress against each other (no clearance remains between the crests and roots of the threads because of the taper). The basic profile is a 55° truncated and rounded triangle, tapered at an angle of 1☄7′ (1.79°) relative to the axis. (Opposed to BSPP, which will be discussed in the next section). In simple words, it means that the thread forms a mechanical seal without the aid of an O-ring or sealant. The formal definition in ISO-7 is “Pipe threads where pressure-tight joints are made on the threads”. It is the common name of a group of threads defined by ISO 7-1 & ISO 7-2 standards. BSPT stands for British Standard Pipe Tapered.
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