Best Steel Square Head Bolts in 2026
Daisy
Last Updated: Jul 18, 2026
Daisy
Last Updated: Jul 18, 2026
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Eastlo | 9.92 | ✅ | ✅ | ✅ |
Contents: 25 PCS 1/4-20 x 1-1/2 inch carriage bolt with round domed head and suqare neck
Screw Length: 1-1/2 inch or 38mm (measured from under the round head, including the neck height)
Big round domed head designed to eliminate the need for a washer; Square neck underneath the head helps self locking
Diameter of the head: 14.3-15mm; Height of the round head: 3.18-3.68mm; Height of the Neck:3.18-3.96mm
Made of 304 stainless steel 18-8 (no coating outside) which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.86 | ✅ | ✅ | ✅ |
Product Name: Square Head Bolt; Material: Carbon Steel; Finish: Zinc Plated; Color: Silver Tone; Thread Size: M6 x 20mm / M6 x 0.79"(D*L); Pitch: 1mm
Head Size: 10mm x 10mm x 2mm / 0.39" x 0.39" x 0.08"(L*W*T); Package Content: 20 x Square Head Bolt
Advantage: Square head bolt offers a large bearing area, is made of carbon steel, zinc plated finish to prevent rust, high strength, good wear resistance and good impact resistance, and durable.
Application: Square head bolt can be used for toilet lid installation, and it is also widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, some assembly required furniture and DIY project. Such as the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.
Installation: A wrench/plier is required for installation. Generally, with a nut and a washer to form a fastener device(Not in the package).
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.86 | ✅ | ✅ | ✅ |
Product Name: Square Head Bolt; Material: Carbon Steel; Finish: Zinc Plated; Color: Silver Tone; Thread Size: M6 x 17.5mm / M6 x 0.69"(D*L); Pitch: 1mm
Head Size: 13mm x 13mm x 3.4mm / 0.51" x 0.51" x 0.13"(L*W*T); Package Content: 20 x Square Head Bolt
Advantage: Square head bolt offers a large bearing area, is made of carbon steel, zinc plated finish to prevent rust, high strength, good wear resistance and good impact resistance, and durable.
Application: It is widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, some assembly required furniture and DIY project. Such as the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.
Installation: A wrench/plier is required for installation. Generally, with a nut and a washer to form a fastener device(Not in the package).
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.87 | ✅ | ✅ | ✅ |
Product Name: Square Head Bolt; Material: Carbon Steel; Finish: Zinc Plated; Color: Silver Tone; Thread Size: M6 x 20mm / M6 x 0.79"(D*L); Pitch: 1mm
Head Size: 10mm x 10mm x 2mm / 0.39" x 0.39" x 0.08"(L*W*T); Package Content: 10 x Square Head Bolt
Advantage: Square head bolt offers a large bearing area, is made of carbon steel, zinc plated finish to prevent rust, high strength, good wear resistance and good impact resistance, and durable.
Application: Square head bolt can be used for toilet lid installation, and it is also widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, some assembly required furniture and DIY project. Such as the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.
Installation: A wrench/plier is required for installation. Generally, with a nut and a washer to form a fastener device(Not in the package).
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amadeo City | 9.86 | ✅ | ✅ | ✅ |
Product Name: Square Head Bolt; Material: Carbon Steel; Finish: Zinc Plated; Thread Size: M6 x 15mm / M6 x 0.59"(D*L); Pitch: 1mm
Head Size: 12mm x 12mm x 1.8mm / 0.47" x 0.47" x 0.07"(L*W*T); Package Content: 20 x Square Head Bolt
Advantage: Square head bolt offers a large bearing area, is made of carbon steel, zinc plated finish to prevent rust, high strength, good wear resistance and good impact resistance, and durable.
Application: Square head bolt can be used for toilet lid installation, and it is also widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, some assembly required furniture and DIY project. Such as the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.
Installation: A wrench/plier is required for installation. Generally, with a nut and a washer to form a fastener device(Not in the package).
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Uxcell | 4 |
| Eastlo | 1 |
| Hard-To-Find Fastener | 1 |
We've carried out a comprehensive analysis of 124 reviews on square head bolts, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select square head bolts priced around $9.37, with top brands including hard-to-find fastener and small parts and uxcell
Our team of expert editors reviewed these high-quality items and handpicked the top 6 square head bolts for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include and amazon.com and amadeo city .
We are dedicated to assisting our users in finding the right bolts Products based on their needs, saving them considerable time when choosing which square head bolts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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