As a strategic manufacturing partner, we deliver certified security and extreme durability with our comprehensive product catalog.
Nylon Insert Lock Nuts (Nyloc Nuts) represent a pivotal technological design in high-reliability fastening. By integrating a resilient polymer collar—typically Polyamide 66 (Nylon 6/6)—within a precision-machined stainless steel hexagonal body, nyloc nuts resolve the fundamental hazard of thread loosening caused by continuous vibration, cyclic thermal shifts, and dynamic mechanical loads.
Upon installation, the mating bolt thread does not cut into the nylon insert. Instead, it plastically and elastically displaces the polymer insert, which compresses tightly around the male thread. This interference creates a high-friction radial locking force, known as prevailing torque. Because the nylon insert maintains a physical memory, it exerts a continuous frictional force against the bolt even under loss of axial tension, ensuring the joint remains intact under harsh conditions.
Modern heavy industry requires fastenings that stand up to complex stress cycles and aggressive chemical environments. Here is how Sinsun Hardware maps to global demands.
The rapid shift to Electric Vehicles requires high-vibration proofing on battery enclosures, powertrains, and structural mounts where loose joints present thermal runaway risks.
Outdoor structural durability demands fasteners capable of resisting atmospheric rust. Our SS316 A4-80 lock nuts endure severe UV exposure, salty sea wind, and cyclic wind loading.
Oceanic operations face severe corrosion. A4-80 (316 grade) Stainless Steel features Molybdenum additions that dramatically inhibit pitting corrosion in high-chloride settings.
Hygienic equipment utilizes SS304/SS316 because they withstand aggressive washdowns using heavy cleaning chemicals without degrading structural integrity.
We manufacture custom Nyloc nuts to tight tolerance classes, choosing raw materials based on specific service environments.
| Parameter / Standard | A2 (Stainless Steel 304) | A4 (Stainless Steel 316) | OEM Standard Options |
|---|---|---|---|
| Material Group | Austenitic Stainless Steel (Cr-Ni) | Austenitic Stainless Steel (Cr-Ni-Mo) | Grade 304, 304L, 316, 316L, Duplex |
| Tensile Strength (Class 70/80) | 700 MPa Minimum | 800 MPa Minimum | Up to 1000+ MPa upon custom request |
| Corrosion Resistance | High general atmospheric resistance | Superior chloride & pitting resistance | Passivation, Electro-polishing, Teflon-coating |
| PREN Index | ~ 17.5 - 20.0 | ~ 23.1 - 28.5 | Optimized for specific environmental chemistry |
| Dimensional Tolerances | DIN 985 Standard Class 6H | ISO 7040 Standard Class 6H | Critical tolerances custom ground to ±0.02mm |
| Temperature Range Limit | -60°C to +120°C (insert limited) | -60°C to +120°C (insert limited) | High-temp inserts (up to +200°C) available |
From Sinsun founding in 2006, Sinsun has grown into a leading Chinese fastener manufacturer. Explore our journey of expansion.
Established core production facility targeting domestic self-tapping screw and industrial locking nut markets in Northern China.
Acquired direct export clearances, setting up commercial and multi-language support hubs to service South America, the Middle East, and Russia.
Imported advanced multi-station cold heading machinery and premium tooling configurations, upgrading product finish tolerances (Ra ≤ 0.4μm).
Commissioned four customized gas-fired continuous heat treatment lines and expanded the warehousing system to 12,000 sqm (18,000+ pallets).
We manage the full cycle of production, ensuring maximum chemical consistency, raw material traceability, and reliable logistics.
Core steel is sourced exclusively from XING TAI Steel and Ansteel Group (utilizing 10,000+ tons/year of C1022A and premium grade Stainless wire). In-house spheroidizing annealing ensures a consistent, high-purity microstructure.
We deploy over 200 German-imported multi-station cold heading machines and Taiwanese threading systems, achieving production speeds exceeding 1,200+ pieces/min/machine with zero micro-cracking.
Four advanced, continuous in-house heat treatment lines (20-ton/day capacity) handle hardening and tempering, ensuring uniform mechanical properties and thread fatigue life exceeding 50,000 cycles.
Our 12,000 sqm dedicated packaging facility runs 24/7. Integrated ERP controls automated packaging (3,000+ cartons/hour) and supports direct shipping of up to 50+ TEUs per day.
From engineering review to final international delivery, we keep your production lines moving with full quality checks.
We review your drawings, operational parameters, and mechanical constraints (torque limits, vibration frequency, chemical exposures) to recommend materials.
Sinsun design engineers create CAD models and supply clear quotes with precise price-break options within 48 hours.
We supply functional prototype samples for field tests. This includes dimensional and prevailing torque testing.
Upon design sign-off, we run production using German-engineered cold forging plants, backed by real-time quality control checks.
Every production batch undergoes 12+ checks, including optical thread mapping, hardness verification, tensile tests, and salt spray exposure analysis.
Through our smart warehouses, we manage custom packaging, export paperwork, and delivery directly to your door.
Discover how Sinsun Hardware's custom fasteners solve critical connection challenges for major engineering operations.
Get professional answers about materials, design, standards, and global purchasing of Stainless Steel Nyloc Nuts.
Our facilities are optimized for high-volume output. However, we support new development projects by offering flexible MOQs for prototypes. For standard dimensions, we maintain stock. Contact our sales department to discuss your production volumes.
Yes. OEM and ODM custom manufacturing is a core business. Our engineers work with CAD models, 2D PDF blueprints, and physical samples to produce parts that align with DIN, ISO, ASME, and JIS standards.
We purchase raw steel wire only from certified mills like Ansteel and Xingtai. Each batch receives a Mill Test Report (MTR). In production, we run process controls (SPC) alongside 12+ checks, covering torque, hardness, thread profile, and salt spray resistance.
Nyloc nuts are designed to be semi-reusable. However, prevailing torque decreases with each installation. For critical safety applications, we recommend replacing the nut. The standard Nylon 6/6 insert has a temperature limit of -60°C to +120°C. Above +120°C, we recommend using all-metal lock nuts or high-temperature specialty elastomers.
Thread galling is common with stainless steel fastners due to friction-induced cold welding. To prevent this, we recommend slow, consistent installation speeds, avoiding impact drivers, and applying anti-seize lubricants. Sinsun also supplies custom polymer-coated nuts designed to lower friction.
Lead times range between 4 to 6 weeks, depending on design complexity, raw material requirements, and batch sizes. We provide a firm shipping date and timeline with every quote.
From structural bolts to precision drywall screws, Sinsun supplies certified fasteners to major construction and assembly projects.
Your project deserves a fastener partner who understands the critical link between a single component and overall system integrity. Send us your drawings or specifications, and our engineering team will provide a solution-focused quote within 48 hours.
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