10 Best Square Head Bolts
#1 Best Pick
uxcell Square Head Bolt, 10pcs M6x16mm Fully Thread Carbon Steel Grade 4.8 Square Machine Screws
Brand: uxcell
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- Product Name: Square Head Bolt; Material: Carbon Steel; Finish: Zinc Plated; Color: Silver Tone; Thread Size: M6 x 16mm / M6 x 0.63"(D*L); Pitch: 1mm
- Head Size: 10mm x 10mm x 2.3mm / 0.39" x 0.39" x 0.09"(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).
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#2 Best Value
![304 Stainless Steel Carriage Bolts M3 M4 Square Neck Round Head for Furniture, Shelving and DIY Projects(M4*15 [10 Sets])](https://m.media-amazon.com/images/I/41OBhJ5mnoL._SL500_.jpg)
304 Stainless Steel Carriage Bolts M3 M4 Square Neck Round Head for Furniture, Shelving and DIY Projects(M4*15 [10 Sets])
Brand: SHIYAN Boutique AU
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- 【Anti-Rotation Square Neck for Secure Fastening】The integrated square neck beneath the smooth, dome head locks securely into wood or soft materials during tightening, preventing the bolt from spinning. This allows for easy one-person installation and ensures a perfectly aligned, vibration-resistant finish.
- 【Vibration-Proof Flange Serrated Nuts Included】Each bolt comes with a matching flange nut that features sharp, biting serrations on its base. These serrations grip the material surface, effectively locking the nut in place to prevent loosening from movement or vibration, ideal for furniture and machinery.
- 【Durable 304 Stainless Steel】Constructed entirely from 304 stainless steel, perfect for indoor furniture, outdoor decks, marine applications, and humid environments where rust prevention is crucial.
- 【Sleek Dome Head for a Safe, Finished Look】The low-profile, rounded head provides a smooth, finished appearance with no sharp edges to snag on clothing or cause injury, making it an excellent and safe choice for children's furniture, shelving, and decorative projects.
- 【High-Value Bulk Packs in M3 & M4 Sizes】Offered in practical bulk quantities (10 or 20 sets per size) for M3 and M4 diameters, providing exceptional value. This ensures you have all the matching hardware needed to complete your shelving, furniture, or craft project without interruption.
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#3 Budget Pick
Swpeet 60Pcs 5 Sizes M6×30 M6×50 M8×50 M8×70 M10×80 Black Zinc Carriage Bolts Screws Nuts Washers Assortment Kit, Round Head Square Neck Screws, Full Thread Carriage Bolts
Brand: Swpeet
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- 🎯 What You Get ------ In this kit, you will get 60Pcs Carriage Bolts Screws Bolts Nut Washer. Including Carriage Bolts 5Pcs M6×30, 5Pcs M6×50, 4Pcs M8×50, 4Pcs M8×70, 4Pcs M10×80; and Hex Nuts 10Pcs M6, 8Pcs M8, 2Pcs M10; and Flat Washers 10Pcs M6, 8Pcs M8, 2Pcs M10. In total of 20 sets of bolt, nuts and washers to meet your various fixing needs. Comes with a storage box for easy carrying and using.
- 🎯 High Quality ------ Made of high quality carbon steel and with black zinc plated, these carriage bolts, nuts, and washers are highly resistant to rust, corrosion. Fine workmanship，precise thread, smooth surface without burs. Ideal for long-time using.
- 🎯 Self-Locking Square Neck Design ------ Feature a square neck, the carriage bolt can prevent it from rotating together with the nut. More convenient to install and does not require additional tools to fix the bolts. Self-locking when used within a square hole. With strong holding power and good corrosion resistance.
- 🎯 20 Complete Sets ------ There are 60Pcs in total, 20 sets carriage bolts nuts washers. Thread diameter：M6, M8, M10. They have precise specifications to ensure proper fit. Designed with a round head, square neck, not easy to slip when installed.
- 🎯 Wide Applications ------ This kit is versatile and can be used in various industries. These bolts can be used on wood projects, carriages, timber frame shed build, trailer deck boards, deck project, outdoor bench seat rebuild, etc. Also applied in home appliances, communication equipment, and ship assembly and more. A must-have kit for professionals and DIY enthusiasts.
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#4 Top Choice
Swpeet 80Pcs 5 Sizes M6×30 M6×55 M8×50 M8×70 M10×80 304 Stainless Steel Carriage Bolts Screws Nuts Washers Assortment Kit, Round Head Square Neck Screws, Full Thread Carriage Bolts
Brand: Swpeet
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- 🎯 What You Get ------ In this kit, you will get 80Pcs Carriage Bolts Screws Bolts Nut Washer. Including Carriage Bolts 5Pcs M6×30, 5Pcs M6×55, 4Pcs M8×50, 4Pcs M8×70, 2Pcs M10×80; and Hex Nuts 10Pcs M6, 8Pcs M8, 2Pcs M10; and Flat Washers 10Pcs M6, 8Pcs M8, 2Pcs M10; and Split ring 10Pcs M6, 8Pcs M8, 2Pcs M10. In total of 20 sets of bolt, nuts and washers to meet your various fixing needs. Comes with a storage box for easy carrying and using.
- 🎯 High Quality ------ Made of high quality 304 Stainless Steel, these carriage bolts, nuts, and washers are highly resistant to rust, corrosion. Fine workmanship，precise thread, smooth surface without burs. Ideal for long-time using.
- 🎯 Self-Locking Square Neck Design ------ Feature a square neck, the carriage bolt can prevent it from rotating together with the nut. More convenient to install and does not require additional tools to fix the bolts. Self-locking when used within a square hole. With strong holding power and good corrosion resistance.
- 🎯 20 Complete Sets ------ There are 60Pcs in total, 20 sets carriage bolts nuts washers. Thread diameter：M6, M8, M10. They have precise specifications to ensure proper fit. Designed with a round head, square neck, not easy to slip when installed.
- 🎯 Wide Applications ------ This kit is versatile and can be used in various industries. These bolts can be used on wood projects, carriages, timber frame shed build, trailer deck boards, deck project, outdoor bench seat rebuild, etc. Also applied in home appliances, communication equipment, and ship assembly and more. A must-have kit for professionals and DIY enthusiasts.
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#5 Popular Choice
Rustark 80Pcs 5 Sizes 304 Stainless Steel Carriage Bolts with Nuts and Washers Kit Silver Square Neck Carriage Bolts Screws Metric Round Head Carriage Bolt for Machinery Industry
Brand: Rustark
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- 【 What You Get 】--- You'll receive a 80pcs 304 stainless steel carriage bolts with nuts and washers kit. These carriage bolts come in 5 sizes, including 5pcs M6x30 carriage bolts, 5pcs M6x55 carriage bolts, 4pcs M8x50 carriage bolts, 4pcs M8x70 carriage bolts, 2pcs M10x80 carriage bolts, 10pcs M6 flat washers, 8pcs M8 flat washers, 2pcs M10 flat washers, 10pcs M6 hex nuts, 8pcs M8 hex nuts, 2pcs M10 hex nuts, 10pcs M6 lock washers, 8pcs M8 lock washers, 2pcs M10 lock washers. Sufficient quantities and various sizes can meet your different daily use of needs.
- 【 304 Stainless Steel 】 --- These carriage bolt screws are made of high quality 304 stainless steel which are not easy to break, corrosion-resistant, wear resistant, rust resistant and durable with long-term service life. These carriage bolt screws features with high strength, superior oxidation resistance which can withstand bad environment such as high temperature, cold weather.
- 【 5 Sizes & Unique Design 】 --- The square neck carriage bolts has 5 common used sizes to cover most of using needs. These square neck carriage bolts have a dome shaped head and a square neck that can be anti-theft and makes them self-locking when used within a square hole. And these carriage bolts have clear thread and smooth-symmetrical head.
- 【 Easy To Use 】 --- These carriage bolts are equipped with hex nuts and washers that can be easily to install and use. Their strong holding power ensures the stability and reliability of your projects. Besides, these carriage bolts in various sizes are packed neatly in a separate compartment in a transparent storage box, making it easy to distinguish the size of the product.
- 【 Wide Application 】 --- These carriage bolts are widely used in wood projects, timber frame shed build, trailer deck boards, deck project, outdoor bench seat rebuild, automotive suspension systems, mechanical industry, and other structures that require sturdy support. Suitable for decks, pavilion, ship yacht, home and office appliances, communication equipment, valves, pumps, motors, pergolas, fences, docks, swing sets, etc.
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#6 Top Pick
Glarks 80pcs M6 M8 M10 Carriage Bolts Screws, Round Head Square Neck Bolts, Square Neck Carriage Bolts Screws with Nuts and Washers for Machinery Industry
Brand: Glarks
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- ♛【Package Includes】: You’ll get 20pcs carriage bolts, thread size: m6 x 30mm, m6 x 55mm, m8 x 50mm, m8 x 70mm, m10 x 80mm. head diameter: 13mm, 12mm, 15.6mm, 16mm, 20.3mm. 20pcs hex nuts, size: m6, m8, m10. 20pcs flat washers and 20pcs split lock washers, size: m6, m8, m10. Thread Type: Coarse thread. Standard sizes, bolts meet ASME B 18.5 table3. Sufficient quantity and various sizes can meet your different daily use requirements.
- ♛【Durable Material】: These carriage bolt screws are made of high quality 304 stainless steel. It is not easy to break, corrosion-resistant, wear-resistant, rust-resistant, durable and has a long service life. These carriage bolt screws feature high strength and oxidation resistance, and can withstand high temperatures, cold weather and other harsh environments. They are strong and reliable, burr-free, with smooth and symmetrical heads, suitable for both indoor and outdoor applications.
- ♛【Self-Locking Design】: These Imperial round head carriage bolts have a dome shaped head and a square neck to prevent theft. They are self-locking when used in square holes. The coarse thread type further enhances their grip and retention, providing a strong and reliable connection. Prevents rotation when tightening or removing nuts. It can be used in wood and metal applications.
- ♛【Easy to Use】: These round head square neck bolts come with hexagonal nuts and washers for easy installation and use. Their strong holding power ensures stability and reliability of your project. In addition, these different sizes of carriage bolts are neatly packaged in separate compartments inside a transparent storage box. It is easy to differentiate between the sizes of the products.
- ♛【Wide Application】: Round head square neck bolts are not only suitable for carriages. They can also be used for wood projects, wood framed shed construction, trailer deck boards, patio projects, outdoor bench seating conversions, automotive suspension systems, the machinery industry, and other structures that require sturdy support. Ideal for decks, gazebos, marine yachts, home and office appliances, communication equipment, valves, pumps, motors, pergolas, fences, docks, swings and more.
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#7 Top Pick
Glarks 60pcs M6 M8 M10 Carriage Bolts Screws, Round Head Square Neck Bolts, Square Neck Carriage Bolts Screws with Nuts and Washers for Machinery Industry
Brand: Glarks
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- ♛【Package Includes】: You’ll get 20pcs carriage bolts, thread size: m6 x 30mm, m6 x 50mm, m8 x 50mm, m8 x 70mm, m10 x 80mm. head diameter: 12.8mm, 12.5mm, 16mm, 16.7mm, 20.7mm. 20pcs hex nuts, size: m6, m8, m10. 20pcs flat washers, size: m6, m8, m10. Thread Type: Coarse thread. Standard sizes, bolts meet ASME B 18.5 table3. Sufficient quantity and various sizes can meet your different daily use requirements.
- ♛【Durable Material】: These carriage bolt screws are made of high quality carbon steel. It is not easy to break, corrosion-resistant, wear-resistant, rust-resistant, durable and has a long service life. These carriage bolt screws feature high strength and oxidation resistance, and can withstand high temperatures, cold weather and other harsh environments. They are strong and reliable, burr-free, with smooth and symmetrical heads, suitable for both indoor and outdoor applications.
- ♛【Self-Locking Design】: These Imperial round head carriage bolts have a dome shaped head and a square neck to prevent theft. They are self-locking when used in square holes. The coarse thread type further enhances their grip and retention, providing a strong and reliable connection. Prevents rotation when tightening or removing nuts. It can be used in wood and metal applications.
- ♛【Easy to Use】: These round head square neck bolts come with hexagonal nuts and washers for easy installation and use. Their strong holding power ensures stability and reliability of your project. In addition, these different sizes of carriage bolts are neatly packaged in separate compartments inside a transparent storage box. It is easy to differentiate between the sizes of the products.
- ♛【Wide Application】: Round head square neck bolts are not only suitable for carriages. They can also be used for wood projects, wood framed shed construction, trailer deck boards, patio projects, outdoor bench seating conversions, automotive suspension systems, the machinery industry, and other structures that require sturdy support. Ideal for decks, gazebos, marine yachts, home and office appliances, communication equipment, valves, pumps, motors, pergolas, fences, docks, swings and more.
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#8 Top Pick
GALPADA 4Pcs Threaded Rod Bolts Stainless Steel Square Head T Bolts with Abrasion Resistant Surface for Metalworking and Woodworking Clamping
Brand: GALPADA
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- Square head screws--the heavy duty bolt is made of stainless steel, waterproof, abrasion resistant, , never rust and durable,Threaded Rod Bolt
- Threaded rod bolt--screws featuring a slotted oval head, perfect for when you need to replace decorative screws,T Bolts
- T-slot bolts--carriage bolts are also an for anti-theft bolts because they can only be removed from one side,Punch Milling Machine Screw
- Stainless steel clamping bolt--best screw for roof storage, the contacts surface of the brackets is large enough to apply sufficient pressure on the roof box,Threaded Rod Bolt
- Clamp screw--stainless steel giving them one of the highest forms of corrosion resistance good choice for applying in the sea water,Threaded Rod Bolt
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#9 Top Pick
Swpeet 60 Pack 304 Stainless Steel M6 x 10/12/16/18/20mm Phillips Head Motorcycle Battery Terminal Bolts and Nuts with Square Nuts Assortment Kit
Brand: Swpeet
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- 🥇 What You Get ------ In this kit, You will get 60 Pack 304 Stainless Steel M6 x 10/12/16/18/20mm Phillips Head Motorcycle Battery Terminal Bolts and Nuts with Square Nuts Assortment Kit, Including 30pcs battery bolts +30pcs square nut.(M6x10 6pcs, M6x12 6pcs, M6x16 6pcs, M6x18 6pcs,M6x20 6pcs). Each Motorcycle Battery Terminal Bolts Including Bolts + Flat Washers + Lock Washers. These can meet all your needs.
- 🥇 Quality 304 Stainless Steel ------ Endurance and Rust-Resistant: Made of high-quality 304 stainless steel, our battery bolts and nuts are built to last, with excellent resistance to rust, corrosion, and oxidation. Say goodbye to worrying about replacement any time soon!
- 🥇 Come with Square Nut ------ Size: 11 x 8 x 4mm( Length x Width x Thickness). Simple assembly with included square nuts, Usually use screws to clamp the connected terminal wire; use a wrench to fix the square nut, and use a drive tool to lock the screw in the tightening position. Allow your works to accomplish work faster and more efficient. Square head, female threaded inside.
- 🥇 Easy to Operate ------ The surface of the bolt is smooth and comfortable to touch, easy for you to operate. Our motorcycle battery nuts are easy and effective to install, you can use tools or just with your hands, without spending too much effort and time, bring you more convenience.
- 🥇 Wide Applications ------ Assorted Usages to Apply, Motorcycle Battery Bolts and Nuts are used to secure Motorcycle Battery Terminal and other household DIY projects. These motorcycle battery bolts and nuts are not only suitable for motorcycle battery, but also applicable for wood handicrafts, home improvement, furniture repairs and others.
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#10 Top Pick
Mardatt 45 Set Square Head Bolt with Hex Nut Assortment Kit, M6 x 10/12/ 16/20/ 25/ 35mm Fully Thread Carbon Steel Galvanized Square Machine Screws for Equipment/Machinery
Brand: Mardatt
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- What You Will Get: You will receive 45pcs M6 square head bolts with 45pcs M6 hex nut. These square head bolts are available in 6 sizes: 10pcs M6 x 10mm, 10pcs M6 x 12mm, 10pcs M6 x 16mm, 5pcs M6 x 20mm, 5pcs M6 x 25mm, 5pcs M6 x 35mm, multiple sizes and sufficient quantity can meet your various need in daily life.
- Carbon Steel Material: These square head bolts and nuts are made of carbon steel with blue zinc plated finish, which are anti-rust, corrosion resistant, wear resistant, oxidation resistant, durable for long service life. Maintain fine performance in any harsh environment such as cold, rain and snow. You can choose our product with confidence.
- Easy to Use: The square head bolt come with hex nut to form a fastener device, fully threaded offer a sturdy connection and square head bolt has a large enough support surface, which can bear enough pressure. You can use a wrench or pliers to finish the installation.
- Wide Application: Mardatt square head bolts are widely used in the assembly and maintenance of machinery, railroad, electrical connections, construction, toilet lid, etc. Suitable for the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.
- Sizes Details: Head Size: 10 x 10 x 2.4mm/ 0.39" x 0.39" x 0.09"(LxWxT); Thread Size: M6(6mm); Screw Lenght: 10mm/ 0.39", 12mm/ 0.47", 16mm/ 0.63", 20mm/ 0.79", 25mm/ 1", 35mm/ 1.38". Please check the size carefully before order.
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