Socket Cap Head SEMS Screws

FULLERKREG Socket Cap Head SEMS Screws are pre-assembled fasteners that permanently integrate an ISO 4762 hex socket cap head screw with one or more captive washers — flat washer (FW) and lock washer (LW) — into a single handling unit via thread rolling. By eliminating loose washers, SEMS screws reduce assembly time, prevent washer loss, and ensure consistent clamping load in every joint. Available in multiple washer configurations, materials, and surface finishes to suit general industrial, marine, and high-strength applications.

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How to Choose the Right SEMS Screw

Type	Flat Washer	Material	Finish	Best For
S-Type	Standard (ISO / DIN 125)	A2-70 (SUS304)	Passivated	General industrial, electronics, machinery
L-Type	Large (DIN 9021)	A2-70 (SUS304)	Passivated	Soft substrates, thin panels, oversized holes
M-Type	Small (DIN 433)	A2-70 (SUS304)	Passivated	Confined spaces, tight hole patterns, compact assemblies
S-Type Marine	Standard (DIN 125)	A4-70 (SUS316)	Passivated	Marine, offshore, chemical, coastal environments
FW+LW Black	Standard (DIN 125)	Alloy Steel 40Cr	Black Oxide	High-strength machinery, tooling, automotive (dry indoor)
FW+LW Zinc	Standard (DIN 125)	Alloy Steel 40Cr	Zinc Plated	High-strength with moderate corrosion protection, outdoor industrial

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Product Series

S-Type Double Washer Socket Cap Head SEMS Screws – High Tensile Stainless Steel (A2-70)
Material: SUS304 (A2) · Finish: Passivated · Strength: A2-70 · Flat Washer: ISO Standard (DIN 125) · Lock Washer: Yes · Sizes: M2–M10

L-Type Double Washer Socket Cap Head SEMS Screws – High Tensile Stainless Steel (A2-70)
Material: SUS304 (A2) · Finish: Passivated · Strength: A2-70 · Flat Washer: Large OD (DIN 9021) · Lock Washer: Yes · Sizes: M2.5–M10

M-Type Double Washer Socket Cap Head SEMS Screws – High Tensile Stainless Steel (A2-70)
Material: SUS304 (A2) · Finish: Passivated · Strength: A2-70 · Flat Washer: Small OD (DIN 433) · Lock Washer: Yes · Sizes: M2–M10

S-Type Double Washer Socket Cap Head SEMS Screws – Marine Stainless Steel (A4-70)
Material: SUS316 (A4) · Finish: Passivated · Strength: A4-70 · Flat Washer: ISO Standard (DIN 125) · Lock Washer: Yes · Sizes: M2–M10

Hex Socket Head Cap SEMS Screw FW + LW – Alloy Steel 12.9 Black
Material: 40Cr Alloy Steel · Finish: Black Oxide · Strength: Class 12.9 · Flat Washer: Standard (DIN 125) · Lock Washer: Yes · Sizes: M3–M16

Hex Socket Head Cap SEMS Screw FW + LW – Alloy Steel 12.9 Zinc
Material: 40Cr Alloy Steel · Finish: Zinc Plated · Strength: Class 12.9 · Flat Washer: Standard (DIN 125) · Lock Washer: Yes · Sizes: M3–M16

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Product Showcase

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Why FULLERKREG SEMS Screws?

• 🏭 Direct Manufacturer — full quality control from raw material to finished fastener; material certificates and test reports available.
• 📦 Bulk and Wholesale Supply — competitive pricing for high-volume orders; custom packaging and kitting available.
• 🌍 Global Distribution — experienced in international logistics and export documentation for worldwide customers.
• ✅ Standards Compliance — ISO 4762 head dimensions; DIN 125 / DIN 433 / DIN 9021 washer standards; ISO 898-1 (alloy steel) and ISO 3506 (stainless steel) mechanical properties; RoHS and REACH compliant.
• 🔧 Custom Specifications — special washer configurations, lengths, thread pitches, and finishes available on request.