Explore our premium product lines manufactured at our integrated facility. Delivering exceptional dimensional stability and high strength.
Split lock washers (also referred to as helical spring lock washers) serve as a defense in machinery assemblies prone to dynamic loading and vibration. When a bolt is tightened to its target torque, the split lock washer behaves as a heavy-duty mechanical spring. Its helical configuration compresses, exerting a continuous elastic counter-force against the bolt head or nut.
This localized elastic pre-load offsets tiny dimensional losses in the bolted joint caused by metal creep, thermal contraction, or mechanical shock. Furthermore, the sharp, split edges of the washer bite into the mating surfaces of both the fastener head and the workpiece. This physical bite forms a structural lock that resists the counter-rotational movement of the threads, preventing backing off.
By using premium high-grade spring steel and precise heat treatment methods, our washers maintain their structural shape across various load distributions. These capabilities make them vital components in infrastructure, automotive systems, and marine structures.
Sinsun Hardware, established in 2006, operates Northern China's largest production facility with advanced processing control from raw materials to final packaging.
We work with trusted suppliers like XING TAI Steel to ensure high metallurgical consistency. We perform our own spheroidizing annealing and wire drawing to control material structure. Equipped with multi-station cold heading machinery and Taiwan-developed tooling systems, our production line handles large-scale operations without sacrificing quality. Over 8,500 containers are exported annually to markets in the Middle East, Southeast Asia, South America, and Europe.
A breakdown of the dimensions, standards, and metallurgical coatings utilized in premium industrial settings.
Our manufacturing supports both German DIN 127 (A & B variants) and American ASME B18.21.1 specifications. This ensures correct cross-compatibility for aerospace, defense, and automation projects.
Utilizing our newly expanded four heat treatment lines in 2025, we target hardness zones of HRC 44-51 for carbon steel split washers. This step prevents hydrogen embrittlement and permanent deformation.
Our coatings protect washers in aggressive environments. Options range from standard clear zinc to hot-dip galvanizing, mechanical plating, black oxide, and 1,000+ hour salt spray resistant E-coating.
| Material Class | Applicable Standards | Available Size Ranges | Tensile Strength (Yield) | Standard Surface Finishing |
|---|---|---|---|---|
| High Carbon Spring Steel (C65-C75 / 70# / 65Mn) | DIN 127B, ASME B18.21.1 | M2 to M48 (Metric) | #2 to 2" (Imperial) | ≥ 1,000 MPa (Post Heat Treatment) | Yellow/Blue-white Zinc Plated, Black Oxide, Dacromet |
| Austenitic Stainless Steel (SUS 304 / A2) | DIN 127B, ISO 3506-1 | M2 to M36 | ≥ 500 to 700 MPa | Passivated Bright Finish |
| Marine Grade Stainless Steel (SUS 316 / A4) | DIN 127B, ISO 3506-1 | M3 to M36 | ≥ 550 to 800 MPa (Ultra-High Anti-Corrosion) | Electropolished Bright Finish |
| Alloy Steel (70# / Carbon Steel) | ASME B18.21.1 Heavy Duty | 1/4" to 3" | Customized high elasticity settings | Phosphate Coated, E-Coat, Hot-Dip Galvanized |
How our fasteners ensure connection security under vibration, extreme temperatures, and high tension.
Combats vibrational relaxation caused by high engine cycle rates. Our split lock washers maintain bolt tension in mounts, suspension units, and transmission boxes.
Vibrations on railway tracks demand reliable components. We supply structural carbon steel and alloy washers that maintain clamp loads under heavy axle crossings.
Wind turbine nacelles and solar tracking frames experience constant wind shear. Sinsun's hot-dip galvanized and stainless steel washers protect against thermal cycles and structural shifting.
Track our evolutionary progress from a localized workshop to a leading exporter of industrial components.
Sinsun began operations with a focus on self-tapping screws, building our manufacturing expertise from the ground up.
We expanded our reach by setting up a dedicated export division to supply overseas distributors.
Integrated spheroidizing furnaces and wire drawing systems to control material quality from the raw steel phase.
Added German multi-station cold heading machinery to support high-precision tooling requirements.
Annual production output hit 36,000 tons, delivering over 1,100 export containers worldwide.
Opened our 12,000 sqm warehouse, optimizing stock levels and lead times for regular orders.
Added four continuous heat treatment lines to maintain product consistency and meet project delivery timelines.
We work to meet the procurement standards of global markets. Sinsun implements a multi-phase quality check program covering dimensional verification (±0.02mm) and surface finish inspections (Ra ≤ 0.4μm).
Our raw materials are fully traceable back to mill certificates. Our testing lab conducts salt spray testing, hardness checks, and tensile test procedures to confirm compliance with DIN, ISO, and ASTM/ASME requirements before dispatch.
Whether you require customized packaging configuration, private OEM labelling, or mixed container loads, our sales and logistics team assists with shipping logistics, import documentation, and local compliance requirements.
The industrial landscape demands cleaner chemistry, higher strength, and predictive performance tracking.
We are shifting our finishing processes toward hexavalent chromium-free coatings, complying with RoHS and REACH regulations without reducing corrosion resistance.
Development is underway on micro-alloyed steels that provide high load capacities with thinner washer cross-sections, helping to reduce assembly weights.
We are integrating real-time visual inspection systems on our cold heading lines. Optical sorters examine each washer for dimensional consistency before final packaging.
A look at our plant floor, material warehouses, and loading yards handling global exports.
Answers to common questions from engineers and procurement specialists about split lock washers.
A collection of structural fasteners, anchors, and connectors built to standard specifications.
If you require custom dimensions, specialized surface treatments, or volume pricing for split lock washers, contact our engineering office for assistance.
