10 Best Schnorr Disc Springs 2026

⚡ Quick Verdict

📋 How We Evaluated

Evaluations focus on material durability, vibration resistance, and finish quality. Performance metrics include structural integrity, size accuracy, and suitability for various fastener types.

Size	M6
Finish	Yellow Zinc
Type	S-Series
Pack Size	50

What We Found

The M6 Yellow Zinc Schnorr Type S washer is a standard for anti-vibration fastening. These feature serrations on both sides to bite into the fastener and substrate. This dual-action design offers great resistance to loosening. The yellow zinc-chromate plating resists corrosion effectively. This fifty-piece pack is useful for professional shops.

They accommodate various bolt types, including recessed heads. These maintain spring force even after repeated tightening. They are reliable for preventing failure in high-stress environments.

Who It’s For

These washers are essential for anyone building or restoring machinery prone to vibration. They are ideal for automotive enthusiasts, industrial repair technicians, and assembly line workers. If you frequently deal with bolts backing out of threaded holes, these serrated washers are the solution.

The value proposition is strong for those needing a bulk supply of high-quality, corrosion-resistant hardware for diverse metric projects.

Size	M4
Finish	Stainless Steel
Material	A2/304
Pack Size	100

What We Found

The M4 Stainless Steel Schnorr Type S washer is a premium solution for corrosive environments. Made from A2/304 stainless steel, these resist rust better than zinc. The serrated design provides excellent vibration resistance. This 100-piece pack works well for electronics or marine applications. The stainless finish fits high-end restorations perfectly.

These maintain the necessary spring force to prevent loosening. They are compatible with most M4 screws, including recessed heads. I would choose these to prioritize longevity over standard plating.

Who It’s For

These are perfect for marine mechanics and outdoor equipment builders. They work for any project exposed to salt air or humidity. I would use these for high-quality restorations where rust prevention is paramount.

Size	M8
Finish	Yellow Zinc
Type	S-Series
Pack Size	50

What We Found

The M8 Yellow Zinc Schnorr Type S washer offers robust performance for larger fasteners. The serrated design provides a secure lock against high stress. The yellow zinc-chromate plating shields against moisture and mild chemicals. These are a staple for serious mechanical projects.

The fifty-piece count provides plenty of stock for large assemblies. Manufacturing precision ensures the serrations provide uniform bite. This consistency is vital for maintaining even pressure. I would recommend these for heavy-duty industrial fastening.

Who It’s For

This size fits larger automotive components and heavy machinery. It serves mechanics who need reliable locking for high-torque joints. I would use these on engines or chassis components to keep fasteners tight.

Size	M10
Finish	Yellow Zinc
Type	S-Series
Pack Size	30

What We Found

The M10 Yellow Zinc Schnorr Type S washer provides security for larger bolt diameters. It features the signature serrated design to resist vibration. The yellow zinc-chromate finish offers a professional look while protecting against degradation. This thirty-piece pack is practical for heavy machinery maintenance.

The washers sit flat to provide consistent spring force. This ensures fasteners stay tight during thermal expansion. The build quality is exceptional with clean serrations. They are a reliable component for critical industrial use.

Who It’s For

This is designed for heavy equipment and agricultural machinery repair. It is ideal for professionals securing large bolts subject to constant vibration. I would use these for fleet maintenance or heavy workshop equipment.

Size	M12
Finish	Yellow Zinc
Type	S-Series
Pack Size	30

What We Found

The M12 Yellow Zinc Schnorr Type S washer is for the largest fasteners here. These heavy-duty washers feature a classic serrated design. The yellow zinc-chromate finish stands up to industrial environments. The thirty-piece pack provides enough hardware for significant machine builds. These maintain their spring force under heavy loads.

They work well with various M12 bolt types. The deep serrations create a very secure lock. I would rely on these for critical fastening tasks.

Who It’s For

This is essential for heavy equipment repair and industrial builders. It suits anyone dealing with large bolts and extreme vibration. I would use these to prevent downtime in heavy machinery.

Size	M5
Finish	Stainless Steel
Material	A2/304
Pack Size	35

What We Found

The M5 Stainless Steel Schnorr Type S washer provides a balanced, corrosion-resistant solution. Its A2/304 construction ensures durability in outdoor environments. The serrated design offers reliable anti-vibration performance. This 35-piece pack works for medium-sized mechanical repairs. The washers maintain a professional aesthetic while providing spring force.

They are compatible with most M5 screws. The build quality reflects high Schnorr standards. I would choose these for any high-quality project.

Who It’s For

These are perfect for automotive enthusiasts and marine mechanics. They suit projects where corrosion resistance and vibration security are both required. I would use these for mid-sized fasteners that must stay tight.

Size	M6
Finish	Stainless Steel
Material	A2/304
Pack Size	25

What We Found

The M6 Stainless Steel Schnorr Type S washer offers superior corrosion resistance. The A2/304 stainless steel construction is perfect for marine environments. The serrated design keeps fasteners secure. The material prevents unsightly rust streaks from appearing. This 25-piece pack suits specific maintenance tasks.

The washers are compatible with most M6 screws. The build quality is consistent with precise serrations. I would consider these a premium choice for long-term reliability.

Who It’s For

These are perfect for boat builders and automotive restorers. They suit users who want serrated locking without the risk of corrosion. I would use these where hardware is visible and exposed to the elements.

Size	M4
Finish	Stainless Steel
Material	A2/304
Pack Size	35

What We Found

The M4 Stainless Steel Schnorr Type S washer is a smaller pack variant. This 35-piece set is great for targeted repairs. The washers provide a high-quality serrated locking mechanism. Because they are stainless steel, they resist oxidation better than zinc. This makes them ideal for visible exterior bolts.

The precision serrations ensure a firm grip. The stainless material maintains structural integrity over time. They fit most M4 hardware for versatile use.

Who It’s For

This smaller pack suits hobbyists and DIY enthusiasts. It is ideal for restoring vintage motorcycles or building custom electronics. I would pick this if you want Schnorr reliability without a large bulk purchase.

Inner Diameter	3/4 inch
Outer Diameter	1 inch
Pack Size	6
Material	Spring Steel

What We Found

The Schnorr 40000433 Disc Springs feature a 3/4-inch inner diameter and a 1-inch outer diameter. These components provide consistent load distribution for specific assemblies. The build quality follows high engineering standards. These serve niche industrial uses but lack the broad compatibility of metric rib washers.

Precision manufacturing ensures each spring maintains its properties under pressure. They work well as load-bearing elements in tight spaces. I would verify your bore measurements before installation to ensure a proper fit.

Who It’s For

These suit engineers maintaining specialized machinery. They work best in controlled environments where specific diameters are mandatory. I would shortlist these for projects requiring precise metric-adjacent sizing. They are intended for industrial maintenance rather than general automotive repair.

ID	1-7/8 inch
OD	1-1/8 inch
Pack Size	10
Type	Belleville

What We Found

The Schnorr KR8 242400 model has a distinct profile for Belleville-style applications. These washers provide a mechanical spring action to maintain bolt preload. The construction meets standard requirements for durability and fatigue resistance. They work well where vibration control is needed in limited spaces.

This ten-pack is useful for small projects or machine repairs. They act as traditional conical springs without the serrated edges. They handle axial loads efficiently to prevent loosening.

Who It’s For

This suits specialists working on Belleville-style assemblies. It is ideal for those needing compact spring force in tight spaces. I would pick these if your assembly suffers from preload loss due to thermal cycling.

What to Look For Before Buying

I would assess environmental conditions and vibration levels before choosing a disc spring. Consider the bolt diameter and material compatibility for a secure fit. Proper torque is essential to engage the serrations.

Check Material Selection

I would use yellow zinc-chromate for general indoor or automotive use. Opt for stainless steel for marine or outdoor environments. Consider the specific chemical exposure of your equipment. Matching the material helps the washer last as long as the fastener.

Value Size Matching

Always measure your bolt diameter before selecting a size. Using an incorrect size leads to poor load distribution. Ensure the inner and outer diameters match your requirements. Precision is the foundation of a secure joint.

Rating Vibration Resistance

I would look for serrated Type S washers for high-vibration tasks. The serrations create a mechanical lock to prevent loosening. Test the fit on a sample surface if possible. This ensures the serrations bite without damaging the substrate.

Verify Installation Techniques

Use correct torque values to engage the serrations. Avoid over-tightening so you do not damage the spring properties. I would always use a fresh washer for critical assemblies. Proper installation is the final step to secure fastening.

Frequently Asked Questions

Can these washers be reused?

I would not recommend reusing them for critical applications. The serrations deform slightly during the initial tightening. Using a new washer ensures consistent performance every time.

Do I need to use a flat washer with these?

No, Schnorr washers are designed to replace standard flat washers. They provide both the spring load and the locking mechanism. Adding a flat washer can interfere with the serrations.

Will these damage my painted surfaces?

Yes, the serrations are designed to bite into the surface. If your surface finish is critical, consider potential minor scratches. Use caution when installing on delicate or aesthetic parts.

Are these compatible with all bolt types?

They work with most standard metric bolts and screws. They are particularly effective with recessed head screws. I would verify that the outer diameter fits your fastener head.

Why use yellow zinc over stainless?

Yellow zinc provides good corrosion resistance at a lower price. Stainless steel is superior for marine or extremely harsh environments. I would choose yellow zinc for cost-effective, general applications.

🎯 Final Verdict

For most industrial and automotive tasks, I would pick the Schnorr M6 Yellow Zinc Type S washer. Its serrated design offers great vibration resistance. The zinc-chromate finish ensures long-term durability. If you work in marine environments, the M4 Stainless Steel version is a strong alternative.

I would always match the washer size to your bolt diameter. Upgrade your hardware to prevent loosening and keep machinery secure.