Hexagon socket  knurled thumb special screws 

• This kind of screws with M8*15
• Surface treatment: Black plated
• 12.9 grade , applied in automobile and machine industry
• Material: SCM435
• Mark/logo on the head.
• All the size and finish information can be customized by you.

 
Key:  Lustrate hydrogen after galvanizing to avoid hydrogen embrittlement.
Operation process:

• After surface finish treatment,put the screws into the equipment of oven.
• Using 200℃ high temperature , 8-24 hrs.
• All the details can follow our News.

Inspection :

• Choose 3-5MM  iron sheet,make a hole of M8 size to fix the hexgaon socket knuled thumb screws,and also coupled with 3-5 pcs split washer and flat washer,connected with 12.9grade nuts.
• Fix with standard of torque .
• Put into the Refrigerated locker.
• After 24hrs,check the special screws.

         Remark: Inspection quantities:50-100pcs 
 

• We have more than 20 years experienced staff in special fasteners researching .developing and producing

• OEM are welcome!Non standard fasteners-Customized requirements are accepted
• We offer customized design service to meet your requirement.    
• Enjoyed high reputation in domestic and overseas market. Customers`logo are acceptable.
• The color.size.material and packing are customized.     

• Each kind of material should be tested before producing.
• All the non standard fasteners should be gone through 3 rounds inspections before export out.

IPQC Process                                                                                                             

• Inspecitons of raw material 
• Supplier Chain Management to ensure raw material products

 

   PQC Process                                                                                                               

• Not only focus on before inspections but also in process of productions.

 

OQC Process

 we test 100% of our production lots to ensure absolute quality. Throughout every step of the manufacturing process we utilize in-process controls . Final inspections are then conducted in room to packaging. 

•  Each kind of material should be tested before producing.
•  All the non standard fasteners should be gone through 3 rounds inspections before export out.

  

 
 

Offer PPAP /Mechanical Tests

 

 

Strong Packaging:

• Polybag
• Small box:    L12*W8*H6CM
• Carton box:  28*20*16CM &23*22.5*15CM and customized by item size
• Pallet  strong packaging

 

 

 

 

 

                             Carton box +pallet packaging to protect your goods in process of shipping