Active Member
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[China]
Address: Rongda Industrial Park, Xinhua Road, Wangting Town, Suzhou City, China
Contact name:
Suzhou Crever Fastener Co., Ltd |
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High Tensile Automotive 25mm Stainless Steel Sems Screws , Hex Head Sems Countersunk
1. Description:
Combination screw is a screw with a spring washers with a flat pad by thread rolling, combination of fastening assembly together.And two combination screw is a screw with only one ball pad or only with a flat mat, would you still can only go with a tooth of the assembly.The combination screw countries expressed in GB9074 label.Common cross slot label is GB9074.8 first three combination screw small countries.This. 8 refers to small head.Is often said that the pan head screw head size.With letters for the PM.The representation method of combination of professional screw manufacturer, habitual is trine PM.The commonly used cross channel big label is GB9074.4 combination of pan head screws countries.The combination of professional call big pan head screws.R head, or head of B.That is the combination of screw head is bigger than small head combination screw head, thicker.And the commonly used one is outer hexagonal screws, this is the outer hexagonal screws.Often said recess outer hexagonal screws.
Combination Screw is the biggest difference between screw and ordinary screw, screw combination is combined with other components, such as elastic washer, flat pad, tooth, etc., and screw is installed before rolling teeth commonly, after in the roll teeth washer is not to come out.
2. Specifications:
| screw sizes | #8-32 through 9/16-18 (M4-M16) |
| Length | 1/4" to 6" |
| Washer material | Stainless Steel |
| Plastic or Neoprene | |
| Washer Type | Belleville Conical |
| Combination External/Internal Tooth | |
| Domed | |
| External Tooth | |
| Flat washer | |
| Helical Spring or Countersunk | |
| Internal Tooth | |
| Material | Carbon Steel |
| Stainless Steel | |
| Alloy steel | |
| Testing Capabilities | Drive Test |
| Ductility | |
| Hydrogen Embrittlement | |
| Rockwell Hardness Testing | |
| Superficial Hardness Testing | |
| Tensile Test | |
| Processing Capabilities | Camera Inspection |
| Eddy Current | |
| EDI | |
| Laser Sorting | |
| Visual Sorting | |
| Special Features | Prototyping |
| Roll Forming | |
| Roll Thread After Heat Treat | |
| Shaving | |
| Slotting | |
| Industry Served | Automotive |
| Telecommunications | |
| Consumer Electronics | |
| Construction | |
| Marine |
3. Applications:
1) Household electrical appliances
2) Building . window and door , metal floor, steel structure and building beam etc
3) Heavy industry . Car , air , shipping , machinery and military equipments .
4) Electronic product .computer , calculator , telecontroller and phone etc
4. Advantages:
1, the screw is not easy to change under the action of
external force, so can reduce the time of the assembly and
maintenance time of late.
2, has a larger torque transmission capacity, to avoid the
unnecessary waste and not damage caused by the damage on the
surface of the screw head electric plating.
3, at the time of twist screws, reduce the labor personnel
section load force and energy consumption.
4, elliptic geometry structure increases the safety
coefficient of twist screws.
5, reducing the stop waiting for the assembly line, the
possibility of rework and scrap
5. More pictures:
HEX HEAD SEMS SCREWS
