ASME B107.300 pdf free download

ASME B107.300-2021 pdf free download.Hand Torque Tools and Torque Testers.
5 PERFORMANCE REQUIREMENTS
Figures arc descriptive and not restrictive. They are not intended to preclude the manufacture or purchaseofother forms of torque instruments conforming to this Standard. Torque instruments shall pass all applicable tests in section 6.
Unless otherwise specified, torque instruments shall be calibrated in the direction(s) of intended use,
Torque instruments shall be capable of being calibrated to the specified accuracy by a method traceable to the National Institute of Standards and Technology (NIST).
5.1 Design — Category 14 MechanicaL
5.1.1 Type I, CLasses A., B, C, and D — Indicating
(a) Operation. Instruments shall indicate torque applied through a deflecting member. They shall operate In both clockwise and counterclockwise directions.
(1) Type I, Classes A and B — Deflecting Beam. Flexing ofa cantilever beam connecting the square drive and hand grip shall provide the basis of operation. Type I, Class A deflecting beam torque instruments maybe similar to that shown in Figure 5.1.1-1. Type I, Class B deflecting beam torque instruments may be similar to that shown in Figure
5.1.1-2.
(2) Type I. Classes C and D — Rigid Housing. The deflecting member and dial mechanism shall be enclosed within the rigid housing. The pointer and dial face shall be protected by a transparent cover that shall be so located and constructed as to be reasonably free from accidental damage resulting from being struck or abraded. Type I, Class C rigid housing torque instruments may be similar to that shown in Figure 5.1.1-3. Type I. Class D rigid housing torque instruments may be similar to that shown in Figure 5.1.1.4.
(3) Type I, Classes B and D — Interchangeable Head Connection forAdapters and Extensions. The torque instrument shall he equipped with a connection, suitable for accepting a variety of mating wrenching heads. The connection and standard wrenching heads shall be designed so that the requirements of para. 5.10 are met throughout the specified accuracy range. The wrenching heads shall comply with the requirements of para. 5.7. Indicating torque instruments with an interchangeable head may be similar to Figure 5.1.1-2 (Class B) or Figure 5.11-4 (Class D).
(b) Indicator. A dial or scale shall be located to permit convenient and accurate reading. The graduation marks shall he colored and shaped to he distinct and easily read. The width of the graduation mark shall not be greater than one-halfthe adjacent space width. The width of the pointer tip or indicator line shall not be greater than the widest graduation mark, nor shall the pointer completely cover any graduation mark on the outer scale. The pointer shall be located close to the scale face to meet the parallax error requirements of para 6.2.
(c) Hand Position. If, in order to achieve the required accuracy, it is necessary to apply the load at a specific point on the hand grip, a pivot shall be located at that point.
(d) Auxiliary Functions. Additional features may be incorporated on the torque instrument to improve accuracy or usefulness. The inclusion of such features shall not be cause for rejection of the torque instrument providing it conforms to the performance requirements of this Standard.
(e) Type I, Classes 4 B, C and D, Style 1 — Plain Scale. No awciliary operational features are required.
(Q Type I, Classes A. B, C and D, Style 2 — Scale With Signal Mechanism. A signal mechanism capable of being adjusted without the use of tools to any graduated value of the instrument shall be provided. The signal shall operate automatically within the accuracy requirements of this Standard.
(g) Type I. Classes A. B, C and D, Style 3 — Scale With Memory Indicator. An auxiliary pointer or other device capable of retaining an indication of the maximum torque transmitted through the instrument shall be provided.
The auxiliary pointer shall function at any graduated torque value within the accuracy requirements of this Standard. Means shall be provided for resetting the auxiliary pointer. Normal handling of the instrument shall not cause the auxiliary pointer to be displaced.ASME B107.300 pdf download.