Machine screw

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Characteristics of mechanic thread performance

1. Mechanic teeth thread shows continuous ups-and-downs shape, and the teeth bottom has no plane, and usually is used with nut.

2. The thread teeth angle is 60°,excluding Webster 55°，and BA teeth angle is 47.5°

3. Coarse teeth is for quick fastening or unfastening, or for those rusted /slight damaged occasions in transportation.

4. Fine teeth functions well in pull-resisting , usually for those high and strong bolts.

5. Webster specification is the first general-purpose one in the world. But it is still widely used in the market now.

The head type and standard applied for mechanic bolts |

Standards which is intemationally used:	GB international,ANSI by USA,JIS by Japan,DIN by Germany,iSO intemational etc.
Often used head type:	BINDING fillister head、BUTTON Button head、BRAZ The old R Botou、FLAT Flat、OVAL Half round head、PAN Pan head、ROUND Round、TRUSS Mushroom head、HEX Six corners first class
Often used driver type:	PHILLIPS cross slots, POZIDRIV meters, SLOTTED- slot, slot TRIANGLE, SQUARE square triangular groove groove, groove, angle HEX six SIX-LOBE, TRI-WING oblique groove groove plum ya
Scope of thread size:	outside diameter:1 mm to 12 mm length:3mm to 160mm
Material selection:	SWRCH10-SWRCH45 ALLOY OR LOW CARBON ALLOY ( BORON, MANG
Standard referred:	GB/T 3098.1-17