Quibbay 924Pcs Grade 8 Bolts and Nuts Assortment Kit, 1/4-20, 5/16-18, 3/8-16, 1/2-13 Heavy Duty Hex SAE Assorted Bolts Nuts and…
Best for
Best SAE heavy-duty
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$55.24
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
This Quibbay 924-piece kit is the heavy-duty SAE specialist in the pool, built around Grade 8 hardened hex bolts, nuts, and washers in 1/4-20 through 1/2-13 sizes, and it carries a 4.7 average. The catch is review depth: that average rests on only about 92 verified-purchase ratings, a far thinner base than the leaders, so the consensus is promising but less firmly established. Buyers who need higher-strength inch-standard hardware for automotive or structural tasks cite the Grade 8 rating and the included case as the reasons to choose it over general-purpose kits.
What reviewers liked
- Grade 8 hardened steel suited to higher-strength SAE applications
- Covers larger 1/4-20 through 1/2-13 bolt sizes
- Includes a storage case and holds a 4.7 average
Where it falls short
- Very thin review base (~92 ratings) makes consensus less reliable
- Among the most expensive kits in the pool at $55.24
- No independent testing to verify the Grade 8 marking
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This Quibbay 924-piece kit is the heavy-duty SAE specialist in the pool, built around Grade 8 hardened hex bolts, nuts, and washers in 1/4-20 through 1/2-13 sizes, and it carries a 4.7 average. The catch is review depth: that average rests on only about 92 verified-purchase ratings, a far thinner base than the leaders, so the consensus is promising but less firmly established. Buyers who need higher-strength inch-standard hardware for automotive or structural tasks cite the Grade 8 rating and the included case as the reasons to choose it over general-purpose kits.
At $55.24 it is also among the pricier options here, reflecting the hardened hardware and larger bolt sizes. No independent lab testing was supplied to verify the Grade 8 marking, so the strength claim rests on the listing and customer impressions. For SAE heavy-duty work specifically, it's the most relevant pick, but the limited review base warrants more caution than the higher-volume choices.
- 【Grade 8 Bolt Kit】Crafted from high-quality carbon steel, this bolt set offers exceptional resistance to rust, wear, and corrosion. With high hardness and superior strength, it ensures long-lasting performance for both nuts and bolts.
- 【SAE Multi-Size Hex Head Nuts & Bolts】Sizes range from 1/4"-20 x 1/2" to 1-1/2", 5/16"-18 x 3/4" to 2", 3/8"-16 x 3/4" to 2", and 1/2"-13 x 1" to 2-1/2". The bolts set includes 201 SAE hex bolts, 241 hex nuts, 241 lock washers, and 241 flat washers — no need to purchase any additional fasteners.
- 【Upgraded Packaging & Compartmentalized Case】This heavy-duty SAE bolts and nuts kit now features reinforced packaging with foam inserts and kraft paper cartons to prevent shipping damage. The transparent case is clearly labeled for easy identification of sizes, while individual compartments keep different types of bolts and nuts neatly organized and prevent mix-ups.
- 【Versatile Applications】These hex bolts are suitable for industrial sectors like machinery, automotive, construction, electronics, and shipbuilding, as well as for various repair and maintenance tasks. Ideal for both professional tradespeople and DIY home users seeking a reliable, all-in-one fastener solution.
- 【High-Quality After-Sales Service】These nuts and bolts assortment kit are suitable for general maintenance and replacement. Should you have any inquiries regarding our bolt and nut set, please feel free to contact us – we provide prompt assistance.
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