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M8-1.25 X 35 Sunk Screw
QS Fastener: M8-1.25 X 35 Sunk Screw
Name: M8-1.25 X 35 Sunk Screw
Standard: DIN 7991
Material: SS304
Size: M8
Lenght: 35 mm
Surface: Natural color
Standard: DIN 7991
Material: SS304
Size: M8
Lenght: 35 mm
Surface: Natural color
Quantity
M8-1.25 X 35 Sunk Screw is manufactured from SS304 stainless steel to DIN 7991 and is ideal for highly humid and corrosive environments. The 35 mm length and natural finish allow the 90° countersunk head to sit flush, delivering a clean appearance in food machinery, medical equipment, and outdoor installations.
Analysis of Head-Cracking in Stainless-Steel Screws — Using M8-1.25 X 35 Sunk Screw as an Example
1. Causes of Head Cracking
During the production of M8-1.25 X 35 Sunk Screw, head cracks typically fall into two categories per GB/T 5779.1:
• Forging cracks form in the cutting or heading stage and are usually located on the top surface of the head or around the recess.
• Forging bursts appear at hexagon diagonals, the flange periphery, or the rounded crown of M8-1.25 X 35 Sunk Screw, resulting from excessive local deformation or material inclusions.
During the production of M8-1.25 X 35 Sunk Screw, head cracks typically fall into two categories per GB/T 5779.1:
• Forging cracks form in the cutting or heading stage and are usually located on the top surface of the head or around the recess.
• Forging bursts appear at hexagon diagonals, the flange periphery, or the rounded crown of M8-1.25 X 35 Sunk Screw, resulting from excessive local deformation or material inclusions.
2. Preventing Head Cracking in M8-1.25 X 35 Sunk Screw
Cracking is more common in pan, cylindrical, and cross-recess heads because M8-1.25 X 35 Sunk Screw undergoes significant head deformation. High raw-material hardness or inclusions increase the risk. GB/T 5779.1 defines allowable crack limits; for complete avoidance, order M8-1.25 X 35 Sunk Screw as follows:
• Select low-hardness, high-purity 304/316 stainless steel.
• Optimize cold-heading parameters to reduce the deformation ratio of M8-1.25 X 35 Sunk Screw in each blow.
• Provide 100 % full inspection to ensure every M8-1.25 X 35 Sunk Screw leaves the plant defect-free.
Cracking is more common in pan, cylindrical, and cross-recess heads because M8-1.25 X 35 Sunk Screw undergoes significant head deformation. High raw-material hardness or inclusions increase the risk. GB/T 5779.1 defines allowable crack limits; for complete avoidance, order M8-1.25 X 35 Sunk Screw as follows:
• Select low-hardness, high-purity 304/316 stainless steel.
• Optimize cold-heading parameters to reduce the deformation ratio of M8-1.25 X 35 Sunk Screw in each blow.
• Provide 100 % full inspection to ensure every M8-1.25 X 35 Sunk Screw leaves the plant defect-free.
3. Impact of Minor Cracks on Mechanical Performance of M8-1.25 X 35 Sunk Screw
Extensive tests confirm that minor cracks within GB/T 5779.1 limits have no significant effect on M8-1.25 X 35 Sunk Screw. The threaded portion carries the clamp load, while the head merely secures the assembly and experiences limited stress. Verified results show that M8-1.25 X 35 Sunk Screw with permissible hairline cracks still passes torque-tension and fatigue tests, meeting the requirements for general applications.
Extensive tests confirm that minor cracks within GB/T 5779.1 limits have no significant effect on M8-1.25 X 35 Sunk Screw. The threaded portion carries the clamp load, while the head merely secures the assembly and experiences limited stress. Verified results show that M8-1.25 X 35 Sunk Screw with permissible hairline cracks still passes torque-tension and fatigue tests, meeting the requirements for general applications.
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