Cold Work Socket Cap Screws A4-100

Описание: In the fasteners industry, Cold Work Socket Cap Screws A4-100 refers to high-strength, corrosion-resistant bolts manufactured through a specific cold-forming process to reach an elite performance tier.
Here is the technical breakdown:
1. Specification Breakdown
Socket Cap Screws: Typically refers to DIN 912 or ISO 4762 (cylindrical head with an internal hex drive).
A4: Denotes Grade 316 Stainless Steel. The addition of Molybdenum makes it resistant to chloride pitting (ideal for marine and chemical environments).
100: Represents a tensile strength of 1000 N/mm² (MPa).
Standard stainless screws are usually A4-70 (700 MPa) or A4-80 (800 MPa).
A4-100 matches the tensile strength of a Grade 10.9 Carbon Steel bolt but with the corrosion resistance of 316 stainless.
Cold Work: This is the manufacturing method (cold heading/cold drawing). Because stainless steel cannot be hardened by heat treatment, it relies on strain hardening (plastic deformation at room temperature) to achieve the "100" strength level.