750PCS SAE & Metric Nylon Insert Lock Nuts Kit - Assorted Nylock Nuts

In this review of the 750PCS SAE & Metric Nylon Insert Lock Nuts Kit the bottom line is simple: it is a practical, all-in-one assortment for hobbyists, mechanics and maintenance shops that need common locknut sizes in stainless steel. The reviewer found the kit most valuable for mixed metric and imperial projects because it includes both systems and a clear storage box, making it easy to find the right size quickly. For anyone who frequently works on furniture, small machines or automotive trim, this kit saves time and trips to the hardware store.

Key Features

• Wide size assortment: The kit contains 750 locknuts split between 220 SAE pieces and 530 metric pieces, covering the most commonly used sizes so you rarely run out mid-project.
• 304 stainless steel construction: Nuts are made from 304 (A2-70) stainless steel, offering better corrosion resistance and longer service life than standard plated hardware.
• Nylon insert locking: Each nut has a nylon insert that grips bolt threads for reliable anti-loosening performance under vibration and repeated assembly.
• Clear storage box included: A divided storage box keeps eight imperial sizes sorted and visible for quick selection and reduced loss.
• Metric and SAE compatibility: Including M2 through M12 and common imperial threads like 1/4'-20 and 3/8'-16 means the kit supports both household repairs and light industrial tasks.

Who It's For

This kit is well suited to DIYers, small workshop owners and automotive hobbyists who handle a mix of metric and imperial fasteners and need a compact, organized supply of locking nuts. It is especially useful for routine maintenance, furniture assembly, equipment repair and small fabrication jobs where corrosion resistance and vibration resistance matter.

Those who should look elsewhere include users who require specialty grades, high-strength alloy locknuts or large industrial quantities beyond 750 pieces; also avoid this kit if you need exclusively one uncommon size not listed in the assortment.

Pros & Cons

Pros

• Good value for a 750-piece mixed kit that reduces repeat trips for different sizes.
• Durable 304 stainless steel resists corrosion better than typical galvanized nuts.
• Nylon insert design provides dependable anti-loosening performance under vibration.
• Clear storage box keeps commonly used imperial sizes organized and visible.

Cons

• Durability feedback from some customers is mixed, so heavy industrial use may reveal limits compared with specialty locknuts.
• The storage box appears arranged for imperial sizes only, requiring extra sorting for all metric pieces.

Specifications

Kit quantity	750 pieces (220 SAE, 530 metric)
Materials	304 stainless steel (A2-70) with nylon insert
Imperial sizes included	6#32, 8#32, 10#24, 10#32, 1/4'-20, 5/16'-18, 3/8'-16, 1/2'-13
Metric sizes included	M2, M2.5, M3, M4, M5, M6, M8, M10, M12
Storage	Clear divided storage box for eight imperial sizes

Our Verdict

For general purpose repairs and mixed fastener work the 750PCS lock nuts kit is a practical, cost-effective choice that combines the corrosion resistance of 304 stainless steel with the anti-loosening benefit of nylon inserts. It is a good buy for DIYers and small shops needing an organized assortment of common sizes, though those requiring heavy industrial grade or exclusively metric storage may prefer a different solution.

Frequently Asked Questions

Are these nuts corrosion resistant?
Yes. The nuts are made from 304 stainless steel which offers good resistance to corrosion and oxidation for longer service life.

Does the kit include both metric and imperial sizes?
Yes. The set includes 220 SAE pieces and 530 metric pieces covering common sizes from 6#32 and 1/4'-20 to M2 through M12.

Is a storage box included?
Yes. A clear storage box is provided to keep eight imperial sizes organized and easy to access.