Whether you're assembling machinery, building structures, or tackling DIY projects, lock washers are essential for maintaining bolt tension and preventing loosening due to vibration. This category features high-quality split lock washers in various sizes, materials like zinc-plated steel, 304 stainless steel, and hot-dip galvanized options, available in packs from 50 to over 1,000 pieces, perfect for professionals and hobbyists in the Industrial & Scientific space.
Understanding Lock Washers
Split lock washers, the most common type in this category, feature a helical shape that digs into the nut and workpiece when tightened, creating resistance against rotation. Unlike flat washers, they actively lock fasteners in place, making them ideal for dynamic applications. You'll find options meeting standards like ASME B18.21.1, ensuring reliability in demanding environments.
Key Features to Consider When Buying Lock Washers
Selecting the right lock washer involves evaluating several factors to match your project's requirements:
- Size: Common sizes include 1/4", 5/16", 3/8", 1/2", and metric M2 to M12. Match the washer's inner diameter to your bolt size for proper fit.
- Material: Zinc-plated steel offers corrosion resistance for general use; 18-8 (304) stainless steel excels in harsh, wet conditions; hot-dip galvanized withstands outdoor exposure; thru-hardened Grade 8 provides superior strength.
- Pack Quantity: From 50-pack bulk for pros to 1,000+ piece assortment kits for versatility, covering SAE and metric sizes.
- Standards and Finish: Look for ASME-compliant or yellow zinc finishes for durability and compatibility.
Assortment kits, like those with M2-M12 metric and #4-#12 SAE sizes, save time for varied jobs, while single-size packs suit high-volume needs.
Common Use Cases for Lock Washers
These washers shine in scenarios with vibration or torque:
- Machinery assembly and maintenance in manufacturing.
- Automotive and equipment repairs where parts are subject to movement.
- Construction and structural fastening exposed to weather.
- Electronics and appliances requiring secure, low-profile locking.
For broader options, explore our Fasteners category or the parent Washers section to compare with flat or bevel types.
Top Brands and Product Highlights
Trusted names dominate this category. Hillman delivers reliable zinc split lock washers in popular sizes like 1/4", 5/16", and 3/8", with 100-packs ideal for everyday use—check their dedicated Hillman Lock Washers for more.
MakersBolt stands out with ASME-compliant options, including Grade 8 yellow zinc and hot-dip galvanized 1/2" packs, perfect for heavy-duty applications. Their MakersBolt Lock Washers lineup emphasizes strength and standards.
For stainless steel needs, brands like Instockbolts and binifiMux offer 304 varieties, while Vifmy provides expansive kits up to 1,780 pieces blending metric and SAE, streamlining inventory for fabricators.
Specialized MakersBolt Washers cater to pros seeking precision, complementing these lock options.
Frequently Asked Questions
What is the difference between split lock washers and other types?
Split lock washers use a spring-like split to bite into surfaces, outperforming helical or toothed types in high-vibration settings, though they may not suit soft materials.
Are stainless steel lock washers better than zinc-plated?
Stainless (304/18-8) resists corrosion superiorly in marine or chemical environments, while zinc-plated suffices for indoor or mildly corrosive uses at lower cost.
Can I use lock washers with all bolt types?
Yes, pair with machine screws, bolts, or cap screws, but always match sizes and avoid over-soft materials where deformation occurs.
How do I install lock washers correctly?
Place under the nut, split facing up toward the nut for optimal grip; tighten to spec torque without bottoming the split.
Are assortment kits worth it?
Absolutely for mixed projects—kits from Vifmy or binifiMux cover common sizes, reducing reordering and ensuring readiness.
