Industrial Fastener · Bolts Series
Countersunk Socket Screw
Countersunk socket screws use a 90-degree flat head that seats flush with the surrounding surface. The internal hex drive provides clean installation in machine slides, fixtures, panels, and assemblies where a protruding bolt head would interfere with movement or appearance.
Product Overview
Countersunk Socket Screw sourcing essentials
Countersunk socket screws use a 90-degree flat head that seats flush with the surrounding surface. The internal hex drive provides clean installation in machine slides, fixtures, panels, and assemblies where a protruding bolt head would interfere with movement or appearance.
DIN 7991, ISO 10642, ANSI/ASME B18.3
Alloy steel, Stainless 304/316
Flush panels, machine slides, fixtures, tooling, equipment covers
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standards | DIN 7991, ISO 10642, ANSI/ASME B18.3 |
|---|---|
| Head Angle | 90° metric; confirm angle for inch-series drawings |
| Property Class | 10.9; A2-70 / A4-70 stainless |
| Diameter Range | M3 – M24 |
| Material | Alloy steel, Stainless 304/316 |
| Surface Finish | Black oxide, Zinc plated, Nickel plated, Stainless |
| Typical Application | Flush panels, machine slides, fixtures, tooling, equipment covers |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
How should the countersink be prepared?
Machine a matching 90-degree countersink to the head diameter and height specified by DIN 7991 or ISO 10642. The screw should finish flush without bottoming at the tip of the countersink. Confirm the standard because nominal head dimensions can differ.
Why is the standard property class commonly 10.9 instead of 12.9?
A countersunk head has less material around the drive and a different load path than a cylindrical DIN 912 head. ISO 10642 commonly specifies Class 10.9 to balance strength with the geometric limitations of the flat head.
Ready to quote Countersunk Socket Screw?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.