Best M4 Hardware Washers in 2026

SIZING: Fits 1/4" fasteners | Inside Diameter: 9/32" | Outside Diameter: 5/8" |Thickness: 0.050" | Quantity: 100 Pieces per package

CERTIFIED STAINLESS STEEL: Made from 18-8 (304) premium stainless steel, our fasteners are tested and certified to ensure the washers you receive are grade 18-8 stainless and meet size specifications.

BLACK OXIDE: These stainless washers are proudly black oxidized in the USA to military specifications, giving the washers a sleek look and added corrosion and abrasion resistance.

✔Product Name: Stainless Flat Fender Washers

✔Made from durable stainless steel.

✔Perfect for all indoor/outdoor applications.

【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 600 pieces/9 sizes of the most commonly used stainless steel washers in a plastic case, different size can satisfy your different needs.

【Design】Flat washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.

【Material】304Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.

★『Product Type』: High quality large penny fender washers assortment set.

★『High Quality Meterial』: All the flat washers are made of 304 stainless steel, which offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance.

★『Easy to Use』: They are very easy to install, the washer's surface are smooth can reduces friction between the fasteners, prevents leakage, isolates, prevents loosening or dispersion pressure.

❤ 1, HIGH QUALITY MATERIAL ---- High quality pure copper material, fine workmanship, smooth surface, no burr, durable, long service life, not easy to damage, the material itself luster can be preserved for 10 years and 20 years as new.

❤ 2, WIDE APPLICATION ---- Perfect for Electrical Connections on Household and Commercial Appliances, Automotive and Marine Uses in Which the Power Source Has a Threaded / Bolt-type Connection

❤ 3, EASY TO USE ---- Sturdy and durable, great corrosion resistance for outside applications, easy to install. Flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through

DIMENSIONS: Inside Diameter: 1/2", Outside Diameter: 7/8", Pack of 100, 304 stainless steel.

STAINLESS STEEL: Made from stainless steel for superior corrosion resistance, there're strong and not easy to deform or slip.

LOOSENING PREVENTION: The spring washer offers axial flexibility that's intended to protect fastened assemblies against loosening from vibration.

DIMENSIONS: Inside Diameter: 6mm(0.24"), Outside Diameter:10mm(0.39"), Pack of 100, 304 stainless steel.

STAINLESS STEEL: Made from stainless steel for superior corrosion resistance, there're strong and not easy to deform or slip.

LOOSENING PREVENTION: The spring washer offers axial flexibility that's intended to protect fastened assemblies against loosening from vibration.

DIMENSIONS: Inside Diameter: 10mm(0.39"), Outside Diameter:15mm(0.59"), Pack of 50, 304 stainless steel.

STAINLESS STEEL: Made from stainless steel for superior corrosion resistance, there're strong and not easy to deform or slip.

LOOSENING PREVENTION: The spring washer offers axial flexibility that's intended to protect fastened assemblies against loosening from vibration.

Flat washer provides a bearing surface for fastener load distribution or acts as a spacer

Steel is often used in applications where strength is the primary consideration

Zinc plating resists corrosion and has a reflective appearance

Absolutely Superior Quantity: the package comes with 150 zinc-plated plaster washers(screw not included), which measure approx. 1 inches in diameter, ample quantity to meet your daily use needs, or as a backup in case of emergency.

Quality Material: our plaster repair rings are made of steel with galvanized surface, reliable and sturdy, not easy to deform and rust, can serve with confidence for a long time.

Ideal for Fastener Hardware: the middle of the plaster buttons is pre-drilled for the installation of screws, and the back of the plaster buttons is convex for insertion into the surface of the back plate to play a fixed role.

HARDNESS: These are available in 30, 50, and 70 durometers. The softer durometers have lower weight load ratings.

VERSATILE: Rated to isolate 27 to 60 lbs per disc

USES: They can be used as feet, stops, spacers and protectors in many different applications and industries.

WHAT YOU GET: 100 stainless steel #8x3/8" Spring Lock Washers ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our Spring Lock Washers are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our Spring Lock Washers can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.

Reduce Vibration in Sensitive Equipment

High Performance Sorobthane Ultra-Soft Polyurethane

Absorbs Upto 94.7% of Vibration

WHAT YOU GET: 100 stainless steel #8x3/8" Spring Lock Washers ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our Spring Lock Washers are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our Spring Lock Washers can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.

WHAT YOU GET: 100 stainless steel 1/4"x1 flat pads ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our pads are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our flat pad can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.

Product Name: Square Washer; Fit Screw/Bolt Thread Diameter: M3(#5); Inside Diameter: 13.2mm / 0.52"; Outside Size: 40 x 40 x 4mm / 1.57" x 1.57" x 0.16"(L*W*T); Package Content: 2pcs x Square Washers

Material: Square plate washers are made of 304 stainless steel, rust and corrosion-resistant, with good heat and low temperature strength, suitable for indoor and outdoor use.

Advantages: Square washers provide more contact area for fasteners, it is a good choice for applications requiring higher carrying capacity, provide greater stability and prevent loosening.

Product Name: Square Washer; Fit Screw/Bolt Thread Diameter: M4(#8); Inside Diameter: 4.5mm / 0.18"; Outside Size: 20 x 20 x 1mm / 0.79" x 0.79" x 0.04"(L*W*T); Package Content: 20pcs x Square Washers

Material: Square plate washers are made of 304 stainless steel, rust and corrosion-resistant, with good heat and low temperature strength, suitable for indoor and outdoor use.

Advantages: Square washers provide more contact area for fasteners, it is a good choice for applications requiring higher carrying capacity, provide greater stability and prevent loosening.