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Square head bolts offer a unique design for specific applications where traditional hex heads are not ideal. Their distinct shape provides excellent leverage for tightening and loosening, especially in confined spaces or when a high torque is required. Choosing the right square head bolt ensures a secure and reliable connection for your project.
🏅【Package Included】🏅: You will receive 45 M6 square head bolts - 10MM, 12MM, and 16MM sizes, each with 10 pieces; and 20MM, 25MM, and 35MM sizes, each with 5 pieces. Additionally, you will receive 45pcs of M6 hex bolts, making a total of...
🏅 【Zinc-Plated Carbon Steel】🏅 :Our square head bolts are made of carbon steel with a zinc-plated surface, featuring high hardness, durability, wear resistance, and robustness. They are resistant to rust and discoloration, providing the bolts...
🏅 【Various Sizes】🏅 ：In the M6 square machine screws kit, we have prepared 10MM/0.39", 12MM/0.47", 16MM/0.63", 20MM/0.79", 25MM/1" , 35MM/1.38", 6 size M6 carbon steel square bolts with hexagon for you, you can free choose the products you need...
🏅 【Square Design】🏅: Square bolts feature prominent edges on their square heads, facilitating easy rotation with a spanner and reducing slippage. The larger contact area ensures stable tool engagement during rotation. This design is superior to...
🏅 【Widely Application】🏅: Square head track bolts are commonly used in manufacturing and assembling machinery like aircraft, trains, ships, etc. They can also fix structural components such as guardrails, home appliances, and pipeline...
Product Name: Square Head Bolt; Material: 304 Stainless Steel; Color: Silver Tone; Thread Size: M6 x 20mm / M6 x 0.79"(D*L); Pitch: 1mm
Head Size: 10mm x 10mm x 4mm / 0.39" x 0.39" x 0.16"(L*W*T); Package Content: 10 x Square Head Bolt
Advantage: Square head bolt offers a large bearing area, is made of 304 stainless steel, anti-rust, wear-resistant, corrosion-resistant, and can be used indoors and outdoors.
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...
Installation: A wrench/plier is required for installation. Generally, with a nut and a washer to form a fastener device(Not in the package).
Made of solid 304 stainless steel, rust and corrosion resistant even in salt water, designed for the harshest environments
T-bolt made of 304 solid stainless steel, 0.79x0.79x0.16inch (20x20x4mm) square head base, M6/M8 thread, shank length 35mm / 1.37inch
The roof box U-bolt clamps on the racks can be replaced, allowing you to replace the roof racks without drilling through the holes - no drilling required!
Can securely attach items to your t-rail crossbars such as solar panels, roof boxes, bike racks, kayak racks, ski racks, cargo baskets, cargo carriers, ski racks, fairings, awnings, fishing rod holders and more!
Square Head Bolt: Surface: Black Oxide; Color: Black; Thread Size: 5/16-18x1-1/2" (D*L); Bolt Length: 38mm / 1.5"; Thread Length: 25mm / 0.98"; Head Size: 12.7mm x 5mm / 0.5" x 0.2" (W*T); Package Content: 10Pcs x Square Head Bolts
Material: Square head bolts are made of carbon steel, which is durable, has fine workmanship, high strength, corrosion resistance, wear resistance, good impact resistance, not easy to damage, and long service life
Design: These bolts have a square head, smooth and precise threads, even force distribution, no offset, and are not easy to slip, and the half-tooth design effectively prevents the bolts from loosening on their own
Easy To Use: It is simple to install and can be installed and tightened with a wrench or pliers. Disassembly is also relatively easy, and suitable for occasions that require frequent maintenance or replacement
Wide Application: Square machine screws are widely used in mechanical equipment, building structures and automobile manufacturing, such as the assembly and fixation of guardrails, home appliances, pipeline installation, equipment, steel frame houses, etc
Square Head Bolt: Surface: Black Oxide; Color: Black; Thread Size: 1/2-13x3" (D*L); Bolt Length: 75mm / 2.95"; Thread Length: 50mm / 1.97"; Head Size: 19mm x 8.5mm / 0.75" x 0.33" (W*T); Package Content: 2Pcs x Square Head Bolts
Material: Square head bolts are made of carbon steel, which is durable, has fine workmanship, high strength, corrosion resistance, wear resistance, good impact resistance, not easy to damage, and long service life
Design: These bolts have a square head, smooth and precise threads, even force distribution, no offset, and are not easy to slip, and the half-tooth design effectively prevents the bolts from loosening on their own
Easy To Use: It is simple to install and can be installed and tightened with a wrench or pliers. Disassembly is also relatively easy, and suitable for occasions that require frequent maintenance or replacement
Wide Application: Square machine screws are widely used in mechanical equipment, building structures and automobile manufacturing, such as the assembly and fixation of guardrails, home appliances, pipeline installation, equipment, steel frame houses, etc
♛【What You Get】: You will receive 45pcs m6 square head bolts, including 10pcs x 10mm(3/8in), 10pcs x 12mm(1/2in), 10pcs x 16mm(5/8in), 5pcs x 20mm(3/4in), 5pcs x 25mm(1in), 5pcs x 35mm(1-3/8in). In addition, you will also receive 45pcs m6 hex nuts...
♛【Durable Quality】: Our square machine screws bolts are made of carbon steel. The surface is zinc-plated for high hardness, durability, wear resistance and sturdiness. They are not easy to rust and discolor, prolonging the service life of the bolts...
♛【Square Head Design】: The square head design of the square bolts has a large load bearing area. Enhanced grip for easy rotation with a wrench and reduced slippage. The large contact area ensures stable tool engagement during rotation. This design...
♛【Easy to Use】: These square head bolts come with a nut. They can be easily installed and form a fastening device. Typically, you can use a wrench or pliers to complete the installation of square head bolts. Note: Wrench or pliers are not included...
♛【Wide Application】: Square head bolts can be used for toilet cover installation. Also widely used in machinery, railroads, electrical connections, construction, some assemblies required for the assembly and maintenance of furniture and DIY...
Last update on 2026-07-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Square Head Bolts
Material and Durability
Selecting the appropriate material is crucial for the longevity and performance of square head bolts. Common options include stainless steel, which offers excellent corrosion resistance, making it suitable for outdoor or marine environments. Carbon steel bolts are generally stronger and more affordable, often used in structural applications where rust is less of a concern or can be managed. Consider the environmental conditions and the load-bearing requirements of your project when making your choice.
Size and Thread Type
Proper sizing ensures a secure fit and optimal performance. Square head bolts come in various diameters and lengths to accommodate different material thicknesses and hole sizes. Pay close attention to the bolt's diameter and the length from the underside of the head to the tip. Additionally, understand the thread type (e.g., coarse or fine) and thread pitch, as these must match the corresponding nut or pre-tapped hole for a proper connection. Always measure existing hardware or consult project specifications to determine the correct dimensions.
Frequently Asked Questions
What are square head bolts used for?
Square head bolts are often used in applications where extra leverage is needed for tightening or loosening, such as in machinery, agricultural equipment, or older construction. Their shape allows for a better grip with a wrench, especially in tight spots.
Are square head bolts stronger than hex head bolts?
Strength is primarily determined by material and grade, not necessarily head shape. While the square head offers better leverage, a hex head bolt of the same material and grade will have comparable tensile strength. The advantage lies in the ease of application.
What is the difference between coarse and fine threads on square head bolts?
Coarse threads have fewer threads per inch and are generally stronger and easier to start when fastening. Fine threads have more threads per inch, offering a more precise fit and greater resistance to vibration loosening.
How do I determine the correct size for a square head bolt?
Measure the diameter of the bolt shank and the length from under the head to the end of the bolt. Also, ensure the thread pitch matches the nut or tapped hole you intend to use. Consulting project specifications or existing hardware is recommended.
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