Dual Lock Washers SUS316 (A4) Stainless Steel

Dual Lock Washers – SUS316 (A4) Stainless Steel

FULLERKREG Dual Lock Washers in SUS316 (A4) stainless steel deliver superior vibration-resistant fastening for the most demanding corrosive environments. Engineered to DIN 25201 wedge-locking principles, each pair of cam-faced washers interlocks under load — the greater the loosening force, the tighter the grip. Ideal for marine, offshore, chemical processing, food & beverage, and pharmaceutical applications where both corrosion resistance and reliable anti-loosening performance are non-negotiable.

⚠️ Dimensional Compatibility Notice: Tolerances and mechanical specifications comparable to Nord-Lock®, Twin-Lock® and Heico-Lock® brand locking washers.

Material & Surface Treatment

Property	Details
Material Grade	SUS316 / A4 Stainless Steel (316L)
Surface Treatment	Pickled（洗白）· Passivated（钝化）· Hardened（硬化）
Corrosion Resistance	Excellent — suitable for chloride-rich, marine, and acidic environments
Hardness	≥ 390 HV (hardened for effective wedge-locking function)
Temperature Range	-60°C to +300°C
Magnetic Properties	Non-magnetic (A4 austenitic grade)
Standard Reference	DIN 25201 / ISO equivalent wedge-locking washer
Material Standard	ISO 3506 – A4 (SUS316)

How Dual Lock Washers Work

Each FULLERKREG Dual Lock Washer set consists of two identical washers with radial teeth on the outer face and wedge-shaped cams on the inner face. When installed in pairs (cam-face to cam-face), the cam angle exceeds the thread pitch angle — mechanically preventing any rotational loosening under vibration, shock, or dynamic load.

• ✅ Cam angle > thread pitch angle → self-locking under vibration
• ✅ Compatible with standard bolts and nuts — no special tools required
• ✅ Reusable — can be removed and reinstalled multiple times
• ✅ Suitable for dynamic loads, thermal cycling, and shock environments
• ✅ SUS316 A4 grade — superior resistance to chloride and acid corrosion

Dimensional Specifications

Material: SUS316 (A4) Stainless Steel  |  Surface: Pickled · Passivated · Hardened  |  All dimensions in mm (per pair)

Thread Size	d1 min (mm)	d2 max (mm)	h ref (mm)	Approx. Pairs / kg
M5	5.3	11.0	3.2	~1200
M6	6.4	13.0	3.8	~700
M8	8.4	17.0	4.8	~280
M10	10.5	20.0	5.8	~150
M12	12.5	24.0	6.8	~80
M14	14.5	28.0	7.8	~50
M16	16.5	30.0	8.8	~35
M20	20.5	37.0	10.8	~18
M24	24.5	44.0	12.8	~10

d1 = inner bore diameter  |  d2 = outer diameter  |  h = total height per pair (reference value). Contact FULLERKREG for sizes outside this range or custom specifications.

Selection Guide

Application Scenario	Recommended Size	Key Consideration
Marine / Offshore Structures	M8 – M24	SUS316 A4 for maximum chloride and saltwater resistance
Chemical Processing Equipment	M6 – M20	Passivated surface for acid/alkali resistance
Food & Beverage Machinery	M5 – M16	Hygienic surface finish, non-magnetic A4 grade
Vibrating Machinery / Pumps	M8 – M24	Cam-locking prevents loosening under dynamic load
Structural / Civil Engineering	M12 – M24	High clamping force retention over time
Electrical / Instrumentation	M5 – M10	Non-magnetic, corrosion-free in humid environments
Pharmaceutical Equipment	M5 – M16	316L grade meets cleanroom and hygienic standards

Standard & Compliance

FULLERKREG Dual Lock Washers are manufactured in accordance with DIN 25201 design principles for wedge-locking washers. The SUS316 (A4) grade meets ISO 3506 requirements for corrosion-resistant stainless steel fasteners. All products undergo batch dimensional inspection and surface quality verification before shipment.

• 📋 Design Standard: DIN 25201 (Wedge-Locking Washers)
• 📋 Material Standard: ISO 3506 – A4 (SUS316 / 316L)
• 📋 Surface: Pickled + Passivated + Hardened
• 📋 Inspection: Dimensional & visual per batch
• 📋 Packaging: Bulk bag / box, labeled with size, material grade, and lot number
• 📋 Mill certificates available on request

Product Gallery

FULLERKREG Dual Lock Washers SUS316 (A4) – actual product photos

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Why Choose FULLERKREG?

🏭 Direct Manufacturer	Factory-direct pricing with full production traceability and batch records
🔬 Material Certified	SUS316 / A4 with mill certificates and material test reports available on request
📦 Flexible MOQ	Small sample orders to full container loads — wholesale pricing available
🌍 Global Shipping	Worldwide export with DDP / DAP / FOB terms available
⚙️ Custom Specifications	Non-standard sizes, special coatings, and OEM packaging available on request
💬 Technical Support	Engineering team available for product selection and application guidance

📩 Request a quote or technical datasheet: Contact the FULLERKREG sales team for bulk pricing, custom specifications, and lead time confirmation.