Lock Nuts Manufacturer
MT.BOLTS manufactures Lock Nuts, which are specialized fastening components designed to prevent loosening under vibration or torque. These nuts are engineered with mechanical or friction-based locking features that maintain clamp load and ensure long-term joint integrity. Commonly used in automotive, heavy equipment, machinery, and structural applications, MT.BOLTS provides lock nuts in a wide range of sizes, types, materials, and finishes to meet international standards and critical application requirements.
- System of Measurement:
- Metric (M6–M64) | Imperial (1/4″ to 2.5″)
- Height Range (Thickness):
- Metric: 4 mm to 60 mm
- Imperial: 5/32″ to 2-3/8″
- Thread Pitch:
- Metric: Coarse (default), Fine
- Imperial: UNC, UNF
- Thread Type:
- Right-hand thread (standard)
- Left-hand thread (optional)
- Lock Nut Types:
- Nylon Insert Lock Nut (elastic stop nut)
- All-Metal Lock Nut (distorted thread type)
- Top Lock Nut
- Prevailing Torque Lock Nut
- Serrated Flange Lock Nut
- K-Lock Nut (with external tooth washer)
- Jam Nut (used as a locking companion nut)
Lock Nuts Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Lock Nuts , meeting the demanding requirements of chemical, marine, and high-temperature environments, compliant with various international standards.
| Material Category | Common Grades/Models | Description |
| Carbon Steel | ASTM A307, A325, A490 | High strength and cost-effective, suitable for general structures; requires anti-corrosion coating. |
| Stainless Steel | 304 (A2), 316 (A4), 321, 410 | Excellent corrosion resistance; widely used in food, chemical, and construction industries |
| Duplex Stainless Steel | UNS S31803/S32205 (F51), UNS S32750 (F53) | High strength with superior chloride corrosion resistance; used in seawater, petrochemical, and paper industries |
| Monel Alloys | Monel 400, Monel K500 | Excellent seawater corrosion resistance and mechanical strength; used in marine engineering and pump systems |
| Hastelloy Alloys | Hastelloy C276, C22, B2, X | Excellent resistance to strong acids and oxidizing media; widely used in chemical equipment and flue gas desulfurization |
| Inconel Alloys | Inconel 600, 625, 718 | Resistant to high temperature, pressure, and corrosion; used in heat exchangers, aerospace, and nuclear industries |
| Incoloy Alloys | Incoloy 800, 825, 925 | Ideal for high-temperature acidic environments; widely used in petroleum refining and heat treating systems |
| Nickel Alloys | Nickel 200, 201 | Pure or high-nickel alloys with excellent conductivity and alkali resistance; used in electronics and chemical applications |
Lock Nuts System of Measurement
Lock nuts are available in both metric and imperial systems to meet a wide range of engineering and industrial applications:
- Metric Sizes: M3 to M64
- Imperial Sizes: 1/4″ to 2.5″
- Thread Pitch:
- Metric: Coarse (default), Fine available
- Imperial: UNC (Unified Coarse), UNF (Unified Fine)
- Thread Direction:
- Right-hand thread (standard)
- Left-hand thread (optional, for reverse-thread applications)
- Height Range: Varies by type and size, including full height and thin (jam) types
Lock Nuts Common Standards
Lock nuts are manufactured in accordance with international standards to ensure quality, compatibility, and performance:
- ASTM A563 – Specification for carbon and alloy steel nuts
- ASTM A194 – For high-temperature, high-pressure applications
- ASME B18.16.6 / B18.2.2 – Inch lock nuts and dimensions
- DIN 985 / DIN 982 / DIN 980 / DIN 6927 – All-metal and nylon insert metric lock nuts
- ISO 7040 / ISO 7042 / ISO 7719 – Metric lock nuts, prevailing torque types
- SAE J995 – Mechanical properties for inch-series lock nuts
- GB/T 6182 / GB/T 889 – Chinese national standards for locking nuts
- Custom / OEM specifications – For automotive, aerospace, and heavy machinery applications
Lock Nuts Surface Finishes
- Zinc-plated – Corrosion resistance in indoor environments
- Hot-dip galvanized – Excellent protection in outdoor/marine use
- Black oxide – Mild corrosion resistance, often for aesthetic or indoor use
- Passivated – Used on stainless steel bolts to improve corrosion resistance
- Custom Coatings (e.g., PTFE) – Non-stick, chemical-resistant for harsh environments
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of Lock Nuts
Advantages
- Anti-Loosening: Maintains clamping force under vibration, dynamic loads, or torque
- Versatile: Available in various locking mechanisms (nylon, all-metal, serrated, torque-controlled)
- Reusable: Some designs (like all-metal lock nuts) can be reused multiple times
- No Need for External Washers: Many types provide built-in locking action
Disadvantages
- Nylon Insert Types Are Temperature-Limited: Typically not suitable above 120°C (248°F)
- Higher Installation Torque: Locking features may require more torque to tighten
- Wear from Repeated Use: Prevailing torque types may lose locking ability over time
- Surface Damage Risk: Serrated types can scratch mating surfaces
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Lock Nuts Applications
Lock nuts are used in any assembly where resistance to loosening due to vibration or movement is critical:
- Automotive and Transportation: Suspension, engine mounts, brake systems
- Heavy Equipment and Construction Machinery
- Railway, Aerospace, and Wind Energy Sectors
- Steel Structures and Bridges
- Industrial Machinery and Equipment
- Electronics and Appliances
- General Mechanical Assemblies and Repair
FAQ About Lock Nuts
Nylon insert nuts use a plastic ring to resist loosening, while all-metal types rely on deformed threads or torque to lock without temperature limitations.
All-metal lock nuts can be reused several times; nylon insert nuts may lose effectiveness after one or two uses.
In most cases, no. Lock nuts are designed to prevent loosening without external washers.
All-metal lock nuts are heat-resistant; nylon insert types are limited to about 120°C.
Selection depends on application load, vibration exposure, temperature range, material compatibility, and reusability needs.
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