2 GENERAL ASSEMBLY EXAMPLE Bolt is a threaded

2. GENERAL ASSEMBLY

EXAMPLE :

สวนประกอบของ Bolt is a threaded cylinder with a head. Thread length Hexagonal head bolt and nut Length Width across flat Head thickness

คำทเกยวของกบเกลยว Pitch Lead เกลยวนอก Pitch The distance between crests of threads. The distance a screw will advance when turned 360 o. เกลยวใน Pitch

THREAD TERMINOLOGY Thread Form is the profile shape of the thread. Example : “knuckle thread form

Hexagon Head Bolt M 20 x 100 DIN 931

2. 1 Nuts ISO 4032

Plain Washer DIN 125, Spring Washer DIN 127

THROUGH HOLES & BLIND TAPPED HOLES Metrical Thread d DIN 69 , 76 M 8 M 10 M 12 M 16 M 20 M 24 M 30 fine 6. 4 8. 4 10. 5 13 17 21 25 31 madium 7 9. 5 11. 5 14 18 23 27 33 coarse - 10. 5 13 15 20 25 30 36 Minimum allowance for bind tapped holes (DIN 76( 4. 5 5 5. 5 6 6. 5 7. 5 8. 5 10 Thread runout (X( 2. 5 3. 2 3. 8 4. 3 5 6. 3 7. 5 9 Unthreaded portion (a( 3 4 4. 5 5. 3 6 7. 5 9 10. 5 /2 1. 5 / 2. 5 2/3 1. 5 Through holes (DIN 69( Pitch C/F (P( / 1 1. 25/ 0. 75 / 1. 5 1. 75/ 1 1. 25 / 3. 5 2

Hexagon Screw Md x p x L DIN 933

STUD

Studs DIN-853, 938, 939

STUD DIN 835, 938, 939

le

Thread Runout(X) and Unthread Portion(a)

3. 2 Hexagon Socket Head Cap Screw DIN 912

Hex. Head Fitting Bolt ตวอยางการบอกขนาด Hexagon Head Fitting Bolt M 16 x 50 DIN 609

Hexagon Socket Head Cap Screw DIN 7984