FASTENERS Two metals that be joined together Methode

FASTENERS Two metals that be joined together Methode : 1. 2. 3. 4. Welding Riveting Interference fit / press fit Threaded fasteners ( screw, hex bolt & nut ) + accessories

Imperial size fasteners often use a number of slash marks on the head to identify the grade. To determine the grade of a fastener, you can usually count the number of slash marks and add two. For example, Figure below shows a grade 5 bolt. Identifying imperial size bolt grade Note that the identification rule is not consistent. For example, an SAE grade 3 bolt or screw head has two slashes rather than one. The tensile strenght of bolt is graded by the numbering system 1, 2, 4, 5, 7 and 8. Grade 5, 7, dan 8 are identified on the head of bolt NOTE : Grades 1, 2, and 4 have no identification marking because of their low tensile strength

Metric size bolts use a numbering system that identifies the class of the bolt. Tensile strength increases as the number stamped on the bolt head increases.

There are four designations for Unified Screw Thread: · · Unified National Coarse (UNC) Unified National Fine (UNF) Unified National Extra Fine (UNEF) Unified National Special (UNS). Unified Screw Thread has a 60° angle, with a rounded root and a rounded or flat crest. UNC and UNF threads are the most used

The tool used to cut internal threads is a tap. The process is called tapping threads. The three types of taps shown in Figure beside are for different stages of a cut.

TORQUE WRENCH 1. · Beam – membaca defleksi jarum penunjuk (pointer) yang dipasang kepala torque wrench 2. · Dial – menunjukkan pada suatu dial bila torsi yang diinginkan sudah dicapai. 3. · Click – bila wrench mengeluarkan bunyi “klik”, itu berarti torsi yang ditetapkan sudah tercapai.

Tw : Torque reading scale Ta : Torque desired L : Torque wrench lenght A : Torque extension