Lock Washers Manufacturer
MT.BOLTS manufactures Lock Washers, which are essential fasteners designed to prevent nuts and bolts from loosening due to vibration, torque, or thermal expansion. Lock washers apply tension or create friction between the nut and the surface to maintain a secure connection. They are commonly used in automotive, aerospace, machinery, electronics, and structural applications where vibration resistance and safety are critical. MT.BOLTS supplies a wide range of lock washers in various types, materials, sizes, and finishes to meet international performance and durability standards.
- System of Measurement
- Metric: M3 – M64
- Imperial: #6 to 2.5″
- Thread Compatibility
- Designed for use with metric coarse threads and imperial UNC/UNF bolts and nuts
- Suitable for both right-hand and left-hand threads depending on washer type
- Lock Washer Types
- Split Lock Washer (Helical Spring Washer) – DIN 127 / ASME B18.21.1
- External Tooth Lock Washer – Ideal for wide contact surfaces
- Internal Tooth Lock Washer – Used in confined spaces
- Combination Internal-External Tooth Washer – For enhanced vibration resistance
- Wedge-Locking Washers (Nord-Lock Style) – High vibration, heavy-duty applications
- Tab Lock Washers – With a bendable tab to prevent rotation
- Conical (Belleville) Spring Washers – For pre-load or flexibility
- Serrated Lock Washers – Extra grip for rotating loads
- Custom or application-specific shapes – Available on request
Lock Washers Material Types
MT.BOLTS supplies carbon steel, stainless steel, duplex steel, and nickel-based alloy Lock Washers, 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 Washers System of Measurement
Lock washers are manufactured in both metric and imperial systems to suit global mechanical and industrial fastener requirements:
Metric Sizes: M3 to M64
Imperial Sizes: #6 to 2-1/2″
Thread Compatibility:
Metric: Typically paired with coarse or fine thread bolts
Imperial: Compatible with UNC and UNF threaded fasteners
Thread Type Compatibility:
Right-hand thread: Standard for most applications
Left-hand thread: Optional for reverse-thread systems
Locking Functionality:
Designed to prevent loosening under vibration, dynamic load, or torque
Function varies by washer type (spring tension, friction grip, mechanical lock, etc.)
Lock Washers Common Standards
Lock washers are produced in accordance with international engineering and mechanical fastener standards:
DIN 127 – Helical spring lock washers (split type)
DIN 6797 – Serrated lock washers (internal, external, or combined teeth)
ASME B18.21.1 – Inch-series lock washers
ISO 7089 / ISO 7090 – Plain and chamfered washers for locking systems
MIL-STD-1515 – Military standard for washer performance
Custom / OEM Project Standards – For aerospace, railway, and defense
Lock Washers Surface Finishes
Lock washers are offered with various surface treatments to enhance corrosion resistance and performance under different conditions:
Plain (Self-colored) – Uncoated, for dry indoor or temporary use
Zinc-Plated (Clear or Yellow) – Basic corrosion resistance for general use
Hot-Dip Galvanized – Ideal for outdoor and structural applications
Black Oxide – Aesthetic, mild corrosion protection
Phosphate-Coated – Improved adhesion and anti-galling
Stainless Steel (304, 316) – Corrosion resistance in harsh environments
PTFE-Coated / Powder-Coated – Low-friction or color-coded usage
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Benefits and Limitations of Lock Washers
Benefits:
- Prevents Loosening – Helps maintain bolt/nut tightness under vibration or torque.
- Increases Safety – Reduces risk of mechanical failure due to fastener back-off.
- Cost-Effective – Provides reliable performance at relatively low cost.
- Versatile – Available in various designs for different materials and assemblies (split, serrated, conical, etc.).
- Easy to Use – Simple installation without requiring special tools or adhesives.
Limitations:
- Not Reusable – Many types (e.g., split washers) lose effectiveness after disassembly.
- Limited Torque Resistance – May not be suitable for extremely high-load or structural applications.
- Surface Damage – Some types (e.g., serrated washers) can damage softer contact surfaces.
- Effectiveness Varies – Performance depends on proper material pairing, tightening torque, and washer type.
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Lock Washers Applications
Lock washers are used in a wide range of industries and equipment requiring vibration-resistant fastener security:
Automotive – Engine, suspension, and transmission assemblies.
Aerospace – Avionics, airframes, and structural joints.
Railway & Transportation – Fasteners subject to dynamic motion and vibration.
Industrial Machinery – Motors, pumps, compressors, and rotating equipment.
Electronics & Appliances – Prevents loosening in high-cycle usage.
Construction & Infrastructure – Securing bolts in steel structures and dynamic loads.
Renewable Energy – Wind turbines and solar trackers where constant motion occurs.
FAQ About Lock Washers
Yes, when properly selected and installed for the right application, lock washers help maintain tension and prevent fastener loosening under dynamic loads.
Split lock washers are common for general use; serrated washers are best for high-vibration environments; conical or Belleville washers are ideal for maintaining preload.
Typically no—especially split and serrated types. Reuse can compromise effectiveness and safety.
Yes, but stainless lock washers should be used to avoid galvanic corrosion. Also, some types (like serrated) may gall stainless surfaces.
Avoid in precision assemblies where consistent torque is critical or where washers may damage soft surfaces.
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