Marlco thread measuring parallels BSW (6602-1420)
These thread measuring parallels represent what is probably the simplest and most flexible method of checking the EFFECTIVE DIAMETER of external screw threads. They are manufactured to the highest degree of accuracy and to a specification certified by the National Physical Laboratory. Each pair covers a range of pitches irrespective of diameter or direction of thread.
These parallels are supplied as sets or individual pairs complete with plastic clips (for products ending in P)
Full range: 40 to 4.5 T.P.I..
Sets are presented in plush lined boxes.
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Accuracy and Adaptability
The effective diameter of any thread within the pitch range of the thread measureing parallels can be checked to an accuracy of 0.005mm (0.002"). This applies to left or right hand threads of any diameter.
The workpiece does not have to be removed from the machine for checking and, therefore, the parallels are applicable to both production sampling and inspection situations.
Due to the length of the gauging surfaces, the parallels have an exceptionally long life and offer substatial advantages in terms of flexibility and simplicity over alternative methods.
Simplicity
Standard measuring equipment, usually a micrometer, is all that is necessary for use with the thread measuring parallels and no complicated calculations or tables are required.
A calibrated "zero" is established by taking a reading over the pair of parallels (Dimension X) and a reading is then taken over the workpiece (Dimension Y).
EFFECTIVE DIAMETER = Y-X
Calibration
Due to the method of use, i.e. establishing the "X" dimension with the measuring instrument to be used for checking the thread, the parallels are self-calibrating when new and results do not rely on the "zero" accuracy of the micrometer. Certificates of Conformity are available guaranteeing that the parallels are manufactured to specification.
A chargeable calibration service, traceable to NAMAS standards, is offered for new parallels and also a re-calibration service to detect wear in used parallels.
The thread measuring parallels are supplied as sets or individual pairs complete with plastic clips. Sets are presented in plush lined boxes.
The clips supplied are suitable for work up to approximately 110mm diameter. The design permits modification by the user to extend the capacity for larger work.
| Unit Type | Inch |
|---|---|
| MATERIAL | Steel |
| Set of Parallels | Consisting of one pair of parallels |
| Individual Pairs with TPI range | 14 to 20 T.P.I. |
| Stock Guaranteed | No |
| Stock Availability | < 10 |