532 Каталог HOFFMANN GROUP 2016 Слесарно-монтажный и измерительный инструмент Вер. 47 ENG Стр.532

Каталог HOFFMANN GROUP 2016 Слесарный и мерительный инструмент Стр. 532 0532 ENG Lab2u

Hoffmann Group 47 4sbu M Torque wrenches with digital display - automatic triggering Handy and very compact, single-handed torque wrench, self-triggering. The setting is performed using a digital display (OLED display with battery charge display, rechargeable by mini-USB cable). The unit of measure (Nm/ kgf.cm/ Ibf.ft/ Ibf.in) is easily changed using the multi-function button. Extremely high repeat accuracy, since high quality materials are used throughout. Wearing parts, such as compression springs, are specially pre-treated and sorted. Acoustic and perceptible "click effect"ensures particularly easy use and accurate setting of the desired torque. Size 50-200- With built-in ratchet-only for clockwise tightening. Size 300 - With built-in ratchet - for clockwise and anti-clockwise tightening. Function: The wrench triggers giving a "signal" (clearly audible acoustic tone and noticeable vibration) and afterwards is immediately ready for use again. Application: For controlled tightening of screws to a pre-set torque. For medium to large batch productions. Supplied with: Mini-USB charger cable for the OLED display. Sturdy ratchet, reversible /push-through. Tough and robust steel tube (hardened and hard chrome-plated), slim design. OLED display showing the value, battery charge level and unit of measure. Mini-USB port for charging the display battery. Handle ergonomically embossed. End collar prevents slipping. Sealed for protection against ingress of dirt and liquids. Unlocking display of the setting mechanism, easily visible from any position. 0 Ii I w o =_ 2J JBSBESti 1 unlocked 1 _300 maximum torque Nm 50 100 200 300 1 Torque wrench with digital display 204.93 194.54 204.93 232.65 overall length mm 370 410 495 620 Tightening value N'tn 10-50 20-100 40-200 60-300 Tightening value Ibfft 7-37 15-75 30-150 45 - 220 Resolution Nm 0.5 0.5 1 1 Square drive inch 3/8 1/2 1/2 1/2 Weight kg 0.82 0.95 1.1 1.5 What do we mean by tightening torque The torque (M) is responsible for generating the preload of a screw fastening. It is this pre-load which holds the components together. M = FxL As the nut is tightened, the two plates become tightly connected. Amongst other things, the pitch angle of the screw is responsible for generating the extension of the screw. The intention is that the screw should achieve a defined pre-load. A large part of the torque is devoted to overcoming the frictional effects, such as those due to the surface quality (whether oiled, whether coated), the type of material (steel or plastic) and the accuracy of for instance the hole / the pin, the thread etc. This can mean that up to 90% of the tightening torque is lost in overcoming frictional effects, and only 10% is devoted to creating a pre-load in the screw fastening. 532