---
product_id: 60927986
title: "50400A Stainless Steel Lock and Flat Washer Assortment | 350 Piece Set | 12 Different Sizes in Spring Lock and Flat Design | Prevent Loose Fasteners"
brand: "neiko"
price: "$817"
currency: MXN
in_stock: true
reviews_count: 8
url: https://www.desertcart.mx/products/60927986-50400a-stainless-steel-lock-and-flat-washer-assortment-350-piece
store_origin: MX
region: Mexico
---

# 12 sizes for perfect fit 350-piece versatile set Galvanized stainless steel durability 50400A Stainless Steel Lock and Flat Washer Assortment | 350 Piece Set | 12 Different Sizes in Spring Lock and Flat Design | Prevent Loose Fasteners

**Brand:** neiko
**Price:** $817
**Availability:** ✅ In Stock

## Summary

> 🔧 Lock it down with NEIKO – where strength meets precision!

## Quick Answers

- **What is this?** 50400A Stainless Steel Lock and Flat Washer Assortment | 350 Piece Set | 12 Different Sizes in Spring Lock and Flat Design | Prevent Loose Fasteners by neiko
- **How much does it cost?** $817 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/60927986-50400a-stainless-steel-lock-and-flat-washer-assortment-350-piece)

## Best For

- neiko enthusiasts

## Why This Product

- Trusted neiko brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Galvanized stainless steel ensures rust resistance and long-term strength under pressure.
- • **Organized & Ready:** Sturdy plastic case with compartments and lid display keeps your washers sorted and accessible.
- • **All-in-One Precision:** 350 assorted lock & flat washers cover every fastening need with 12 exact sizes.
- • **Secure Every Connection:** Lock washers prevent loosening, while flat washers evenly distribute load for maximum stability.
- • **Workshop & Home Essential:** Ideal for professionals and DIYers who demand reliability and efficiency in every project.

## Overview

The NEIKO 50400A set includes 350 galvanized stainless steel lock and flat washers in 12 sizes, designed to prevent fastener loosening and distribute load evenly. Packaged in a durable organizer box, this assortment is perfect for professional and home use, ensuring secure, long-lasting connections.

## Description

Set comes with the following quantity of sizes: (50) #6 Lock Washer, (40) #8 Lock Washer, (30) #10 Lock Washer, (25) 1/4" Lock Washer, (15) 5/16" Lock Washer, (15) 3/8" Lock Washer, (50) #6 Flat Washer, (40) #8 Flat Washer, (30) #10 Flat Washer, (25) 1/4" Flat Washer, (15) 5/16" Flat Washer, (15) 3/8" Flat Washer

## Features

- GALVANIZED STAINLESS STEEL: These lock and flat washers provide excellent protection and security for nuts and bolts. They are made with galvanized stainless steel for long-term use and outstanding durability.
- VERSATILE & COMPATIBLE: These assorted washers come in multiple sizes to fit all your screws, nuts, and bolts. Each washer features a solid bearing surface to prevent the nut or bolt head from tearing through the material.
- OPTIMAL SURFACE AREA: Each stainless-steel flat or lock washer easily deflects the screw or bolt load, spreading the weight evenly for a secure and sure fit. These washers for screws and bolts are ideal for use at home or in the workshop.
- THE RIGHT SIZE: This set of washers contains a wide variety of sizes. It includes lock washers in sizes #6, #8, #10, 1/4", 5/16", and 3/8" and flat washers in sizes #6, #8, #10, 1/4", 5/16", and 3/8".
- CONVENIENT STORAGE: Keep your washers ready for your next home or automotive project. This 350-piece set comes in a convenient, sturdy plastic box with divided compartments for easy storage and an inside lid display for easy organization.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Stainless Steel |
| Outside Diameter | 0.38 Inches |
| Washer Type | Flat |
| Exterior Finish | Stainless Steel |
| Item Thickness | 0.05 Inches |
| Size | Lock and Flat Washer, 350 Piece |
| Metal Type | Stainless Steel |
| Brand | NEIKO |
| Item Weight | 0.74 Pounds |
| Color | Silver |
| Number of Pieces | 350 |
| Item dimensions L x W x H | 8.1 x 4.15 x 1.15 inches |
| Head Style | Flat |
| Fastener Type | Flat Washer |
| UPC | 816914021426 |
| Manufacturer | Neiko |
| Global Trade Identification Number | 00816914021426 |
| Part Number | 50400A |
| Item Weight | 11.8 ounces |
| Product Dimensions | 8.1 x 4.15 x 1.15 inches |
| Country of Origin | China |
| Item model number | 50400A |
| Is Discontinued By Manufacturer | No |
| Style | Washer |
| Finish | Silver |
| Pattern | Lock and Flat Washer, 350 Piece |
| Item Package Quantity | 1 |
| Measurement System | Inch |
| Included Components | Split locks, Flat Washers |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Stainless Steel
- **Outside Diameter:** 0.38 Inches
- **Washer Type:** Flat
- **Exterior Finish:** Stainless Steel
- **Item Thickness:** 0.05 Inches

## Images

![50400A Stainless Steel Lock and Flat Washer Assortment | 350 Piece Set | 12 Different Sizes in Spring Lock and Flat Design | Prevent Loose Fasteners - Image 1](https://m.media-amazon.com/images/I/81R7pckVCEL.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: Stainless steel <OR> galvanized?**
A: There are several families of stainless steels with different physical properties. The magnetic properties of stainless steel are very dependent on the elements added into the alloy. A basic stainless steel has a ‘ferritic’ structure and is magnetic, formed from the addition of chromium – it can be hardened through the addition of carbon, making it ‘martensitic’. However, the most common stainless steels are ‘austenitic’ – these have a higher chromium content and nickel is also added. It is the nickel which modifies the physical structure of the steel and makes it theoretically non-magnetic.

**Q: Is this item returnable?**
A: Yes

**Q: Why is amazon promoting a product with false advertising these are not stainless steel ???**
A: It is a cheap grade of stainless. But they are also very inexpensive. "You get what you pay for." is a mantra that will (most times in life) be true.
Amazon has 14 billion items available through their warehouses, and millions of sellers. You cant honestly expect them to be on top of every one of them. If it's cheap, expect it to be cheap. :-)

**Q: Description says "galvanized stainless steel".  nobody galvanizes stainless steel.  it's not necessary.  are these simply galvanized ordinary steel?**
A: It doesn't say what grade stainless steel some heat treatable stainless can rust. If you look for 302 or 316 stainless it wouldn't rust but may not be as strong.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice product
*by J***N on August 7, 2025*

Perfect kit. Just what I neededWide verity. Good price. Nice storage

### ⭐⭐⭐⭐⭐ Great assortment
*by R***E on August 31, 2025*

Great assortmentJust what I seeded.

### ⭐⭐⭐⭐ Good quality rubber O rings
*by G***R on May 27, 2025*

This review is for the o-rings. There's a lot of reviews here that are bad that are not for o-rings, they're for cotter pins and other items I don't know why they're mixed in with this product. These o-rings are great, they're well made as far as I can tell, work just fine in the case is very thick and heavy duty. The only issue I have, is that there's no way to keep the case shut tight. If there was a little slider that goes over the two closure pieces on the case, then it's missing. But it also comes with a little nice box, so you can slide the whole red case inside of the box and keep it in there. That's what I'm doing. Otherwise I would give this five stars

## Frequently Bought Together

- NEIKO 50400A Stainless Steel Lock and Flat Washer Assortment | 350 Piece Set | 12 Different Sizes in Spring Lock and Flat Design | Prevent Loose Fasteners
- WEGOUP 900 Pcs Stainless Steel Flat Washers for Screws, 304 Stainless Steel, Assorted Sizes (M2 M2.5 M3 M4 M5 M6 M8 M10 M12) for Industrial Use, Washers for Bolts

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**Shop now:** [https://www.desertcart.mx/products/60927986-50400a-stainless-steel-lock-and-flat-washer-assortment-350-piece](https://www.desertcart.mx/products/60927986-50400a-stainless-steel-lock-and-flat-washer-assortment-350-piece)

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-07*