ASME B107.300 pdf download

ASME B107.300 pdf download.Hand Torque Tools and Torque Testers.
ASME B107.300 provides performance and safety requirements for manually operated torque instruments. commonly used for measurement of torque to control the tightness of threaded fasteners. It also provides performance and safety requirements for manually operated electronic torque instruments with integral or interchangeable heads. It includes requirements for endurance, torque value ranges, angle measurements, and accuracy for these torque instruments. It further provides performance and safety requirements for electronic torque testers used for checking manually operated, hand-held torque wrenches and torque screwdrivers. It is not intended to describe products infrequently utilized or those designed for special purposes.
This Standard may be used as a guide by state authorities or other regulatory bodies in the formulation of laws or regulations, It is also intended for voluntary use by establishments that use or manufacture the instruments covered.
2 DEFINITIONS
accuracy: the permissible deviation, tolerance, or error band. A higher value means a lower certainty of correctness.
angle: the amount of axial rotational displacement from a start point to an end point.
break-over: a temporary reduction in torque indicating a target value has been achieved, indicated by a displacement of the handle of at least 10 deg.
click: a temporary reduction in torque indicating a target value has been achieved, indicated by a displacement of the handle of less than 5 deg.
first peak: the maximum torque value just prior to the torque drop-off, which on Category 14, Types II and IV torque wrenches occurs as the wrench begins Its momentary reduction in torque.
flex-head: see flexible ratchet head.
flexible ratchet head: a handle with the capability of operating at an angle other than perpendicular to the axis of rotation.
full scale: see rated capacity.
graduation: a mark on the instrument indicating a torque value.
(1) Type I. CiassesA, B, C, andD. The pointer or needle of the torque instrument shall be adjusted to indicate zero torque applied in the plane of operation before being mounted in the tester for any test sequence. Classes A. B, C, and D, Style 2 torque instruments shall have the sIgnal device appropriately adjusted between each test operation.
(2) Type II. The torque shall be applied at a rate sutTiclently slow and steady so that after the release, the instrument will not over-travel causing the test equipment to indicate torque in excess of the release setting.
(3? Types III and IV. The torque shall be applied at a rate sufficiently slow and steady so that the torque at the point of release can be accurately read.
6.4 Accuracy Tests — Category 28
6.4.1 Torque Test. See the flowchart in Figure 6.4.1.1. All test loads shall be applied at the midpoint of the handgrip or at the marked load position for Types I and II and concentric to the handgrip for Types Ill and IV.
The test shall be performed on equipment capable of indicating torque applied within an accuracy of ±0.25% br Design A and ±1% for Design B at any point within the calibrated range of the torque instrument. Interpolated readings of the measuring equipment shall be made no more precisely than one-half of the smallest increment.
Accuracy of test equipment shall be independently verified by a route traceable to N 1ST.
6.4.2 Types II and IV AngLe Test. At the conclusion of the test in para. 6.4.1, the torque instrument shall be tested per the flowchart in Figure 6.4.2-1. All recorded measurements shall be within the requirements of para. 5.10 for Category 28, Type II instruments. The test shall be performed on angle-testing equipment capable of accurately measuring 0.5 deg(or better) and shall be independently verified by a route traceable to NIST.
6.5 Accuracy Tests — Category 29
6.5.1 Measuring Equipment. The accuracy of measuring equipment shall be at least four times better than the accuracy of the unit under test. Accuracy of measuring equipment shall be independently verified by a route traceable to NIST.
6.52 Test Sequence. See the flowchart In Figure
6.5.2-1.
6.6 Gravity Error — Category 14
6.6.1 Type I. The torque instrument shall be located so it is in a horizontal plane and the drive in a vertical plane. The pointershall be adjusted to indicate zero when viewed.