Socket Shoulder Screws 
 ■ standard: ISO7379-1983 
 According: ISO7379-1983 
 ■ Material: SCM435 (chromium-molybdenum alloy steel) 
 Material: SCM435 (Alloy Steel) 
 Stainless steel SUS303/304/316F 
 ■ series: 12.9 SUS304 
 Class: 12.9 SUS304 
 ■ hardness: HRC 39-44 
 Hardness: HRC 39-44 
 Note: Metric steel screw plugs hit the spot. 
 US-made steel screw plugs hit the spot. 
 Can be customized M4, M5 to play small-size high-plug screw. 
 Stainless steel can be customized to play high-plug screw. 
 12.9 alloy steel socket head cap screws 
 Material: SCM435/SCM440 
 Standard: DIN912 GB/T70.1-85 ASME B18.3-1998JISB1176 
 Scope of supply: M2-M80 metric diameter of 3mm-1000mm length 
 US-diameter # 4 - 1-1/2 inch length 1/4--12 
 12.9 metric fine pitch socket head cap screws 
 Material: SCM435/SCM440 
 12.9 metric socket head cap screws the whole tooth 
 Material: SCM435/SCM440 
 12.9 Hexagon screw combination (12.9 socket head cap screws with gasket) 
 Levels: 8.8, 12.9 
 Material: 10B33, 10B21/SCM435 
 Hexagon screw down resistance (12.9-resistant screw off) 
 GB/T70.1-85 ASME B18.3-1998 JISB1176 
 Levels: 8.8, 12.9 
 Material: 10B33, 10B21/SCM435 
 Coating: 90 degrees off the blue-resistant 
 Resistant to 180 degrees off the blue 
 Resistant to 360 degrees off the blue 
 Dacromet SHCS (12.9 Dacromet screw) 
 Levels: 10.9, 12.9 
 Material: 10B21/SCM435 
 Coating: Dacromet