Best Structural Bolts 2025

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Last Updated - 27.07.2025

Best Choice

01

QUARKZMAN

QUARKZMAN Pack of 50 M8-1.25 x 16 Cylinder Screws with Hexagon Socket Carbon Steel Black Oxide DIN 912 Full Thread Allen Screw Fasteners for Machines

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9.9

Exceptional

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[Hex Socket Head Bolts]: the package includes 50 pieces hexagon socket hex head screws in M8-1.25x16; Head Diameter:13.27mm/0.52"; Head Thickness: 8mm/0.31"
Wide Application Hex bolts are essential for assembling machinery, equipment and tools to maintain their structural integrity. They are suitable for indoor and outdoor use, such as automobiles, bicycles, communication equipment and shipbuilding.
Note: Please confirm the correct size you need before purchasing. It is recommended to use a caliper for measurement and avoid using a ruler or tape measure.
Material The M8 screws are made of carbon steel, which has higher corrosion resistance and rust resistance than ordinary bolts, has a longer service life, is less prone to damage, and is stronger.
Design The head of these hex bolts is cylindrical with a hex hole in the middle top, which provides better torque transmission and more stable performance. The screws are fully screwed, very smooth and precise. The force is evenly distributed and does not slip off easily, so they are suitable for replacing bolts at any time.

17,59 €
02

Catime

Solar Hanger Bolts, M10 x 200 mm, Solar Hanger Bolts, Stainless Steel PV Hanger Bolts, 4 Pieces, Includes Double-Headed Self-Tapping Screws, Locking Toothnuts, Rubber Seals

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9.8

Exceptional

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5. Wide application: Our stainless steel hanger screw is ideal for living environments, where it can safely mount photovoltaic supports on corrugated sheet or sheet roofs. Likewise, it is ideal for commercial buildings such as warehouses, factories, production facilities and office complexes. It is valuable for renewable energy projects such as solar parks and municipal solar initiatives and contributes to sustainable energy generation on a larger scale.
4. Easy installation: Our PV hanger screws have a carefully manufactured tip that ensures smooth and precise penetration through installation plates. This design eliminates the need for additional drilling tools and makes the installation process more comfortable and efficient.
3. Value package: Package contains 4 pieces of M10 hanger bolts. Each screw already has 3 nuts and 1 rubber washer mounted, which makes installation easier. In addition, the use of rubber discs can effectively reduce shocks and noise, which increases installation comfort and stability.
2. Heat resistance: Photovoltaic systems are often exposed to sunlight, especially in summer environments with high temperatures. Our solar pole screws are characterised by heat resistance and flame retardation, which effectively reduces potential safety risks and ensures the stable operation of the photovoltaic system.
1. High-quality material: the 304 stainless steel material ensures resistance to oxidation and corrosion and allows stable outdoor use for longer periods of time. Our screws with seal are not easily deformed. This high hardness ensures the reliability and long-term stability of the screws, preserves the structural integrity of the photovoltaic carrier system and reduces maintenance and replacement frequency.

12,99 €
Value for Money

03

Connex

CONNEX KL4081120 Machine Bolts galv. 601 M10x120

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9.7

Exceptional

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Manufactured according to DIN 931
For building structures and frame frames
Contents: 1000 g. (approx. 13 pieces)
Brand quality for DIY enthusiasts and professionals

9,79 €
04

GENSMILE

M5 Swivel Bolts Fish Eye Bolts - Pack of 20 M5 x 20 mm Eye Bolts 304 Stainless Steel Machine Shoulder Lift Eye Bolts, Ring Nut Ring Screw for Automotive Manufacturing Valves Pipes

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9.5

Excellent

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[Reminder]: It is recommended to measure or estimate the size before installation to avoid installation errors due to insufficient size. Specific size markings of this screw can be viewed in the detailed images. No matter what scenario you use the screws, safety and accuracy should be priority to ensure safe use.
[Free Returns]: GENSMILE always insists on providing better products and more professional customer service. If you have any questions, please contact us. For products you are not satisfied with, we offer free returns, free replacement products or full refunds. Our customer service aims to ensure 100% satisfaction so you can buy GENSMILE products with confidence.
[Extensive Application]:This fish eye bolt is widely used and often found in applications such as pipeline shut-off valves, automotive production, construction of steel pipe fasteners, ring nuts, etc. It can also be used in separation scenarios or tools such as in the valve industry or for folding bikes and serves as a good maintenance accessory for these equipments or tools.
[304 Stainless Steel Material]:This fish eye bolt is made of 304 stainless steel and features high strength, rust resistance, corrosion resistance and good stability. The eye of the bolt head is formed by mechanical or punching process in one work step, which provides high structural strength and durability.
Package includes: you will receive 20 pieces M5 x 20 mm fish eye bolts, which can be installed anywhere you need them, in sufficient quantity to meet your daily needs and replacement. This swivel eye bolt is manufactured according to DIN444 standard, with dimensions and manufacturing processes that fully meet the requirements of different standard scenarios.

8,99 €
05

WJUAN

WJUAN Pack of 12 Bicycle Bolts, Colourful Alloy Steel, Brake Discs Screws, Strong Heat Dissipation Performance, with Wrench, Stem Screws, Suitable for Road Bikes, General Bicycles

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9.3

Excellent

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Versatile application: the bicycle brake disc screws are suitable for a variety of bicycle types, including but not limited to city bikes, mountain bikes, road bikes, etc. to meet different riding needs.
Strong alloy: the bicycle screw stem is made of selected high-strength alloy steel to provide excellent corrosion resistance and rust resistance, ensure long-term use without deformation and maintain structural stability.
Efficient heat dissipation: M5 screws bicycle uses precision rolling technology to ensure tight threads and improve sealing, the optimised heat dissipation design contributes to the extension of the product life, and the groove design improves grip on muddy roads.
Easy installation: the brake discs are simply designed, allow for quick replacement of old wrenches and are very adaptable, making them suitable for users of all experience levels.
Complete accessories: the bicycle screw set contains 5 x 10 mm screws and mounting tools to ensure convenient installation and effectively maintain the stability of the brake system.

5,99 €
06

EXIN DEHCEN

Petal Nuts, Pack of 45 Jack Nuts, Nut Expansion with Screws Assembly, Petal Expansion Nut, Petal Nuts, Cavity Dowel Metal, Expansion Nuts, for Thin Walls, Hollow Doors, Iron Sheet (M4 M5 M6)

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9.2

Excellent

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Wide range of applications: petal nuts can be used for various materials, suitable for iron plate, aluminum alloy frame, hollow plate, license plate, drying rack and container trailer. Petal Nuts can be used with a wide range of materials, ideal for construction projects.
Practical size: you will receive 45 pieces petal expansion nut, including 15 pieces M4*20mm, 15pcs M5*25mm, 15pcs M6*25mm, which is sufficient for your daily use. Petal nuts are ideal for use in construction work, underground garages, railroad work, structural buildings and more.
High Quality Material Nuts petal is made of high quality steel, high hardness, corrosion resistance, rust protection, not easy to damage, sturdy and durable. In addition, nuts expansion after exquisite casting, smooth and neat incision, smooth surface, flat and burr-free appearance, can be used with confidence.
Expansion of construction: the petal nuts has a spreading design, when tightening the petal nuts, the anchor bolt is spread to both sides, increasing the attraction. Compared to conventional nuts, our petal groove is stronger and more stable.
Easy to use: groove expansion is very easy to use, without complicated work steps, can be installed successfully. Groove expansion is equipped with a screw and a hollow nut, when the screw is pulled outwards with force, the nut is tightened, forms a petal shape on the plate, clamps the plate tightly, and fixes the elements firmly, not easy to fall.

9,99 €
07

Dayalo

Dayalo Pack of 50 M5 x 10 Countersunk Screws Flat Head Screws Stainless Steel A2 V2A Phillips Fully Threaded Black Oxide

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9.1

Excellent

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Structural advantages: the countersunk head screws, compact and force-uniform screw thread cannot be easily deformed during use, while it is easy to tight, and can be quickly installed, allows flush countersunk of the screw in the component.
Precise attachment: thanks to the cross-shaped groove, the screwdriver sits better in the screw head and thus offers a larger torque transmission surface.
Flat head design: the flat head ensures a flat surface after installation. The screws are both functional and appealing.
Areas of application: M5 countersunk screws are often used in household and office appliances, communication devices and to repair furniture in the cellar or at home.
A2 V2A stainless steel: Countersunk screw is made of A2 V2A stainless steel, burr-free and oxidised. Device screws are corrosion and rust resistant and can be used outdoors or in damp environments. The surface of the product is protected from damage.

6,59 €
08

PinPro

PinPro Ring Bolts According to DIN 580 | Choice of Size and Number | Load Capacity of 70-340 kg | C15E Steel Forged and Galvanised | Metric Thread (4x M10, WLL: 230 kg)

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15% Off
8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Versatile: the eye bolts with metric thread are perfect for home users and offer a variety of indoor and outdoor applications. Whether hanging and securing items, transporting and lifting loads or for DIY projects.
Satisfaction promise: the PinPro brand relies on a high level of customer satisfaction. We meet the highest standards and stand by our quality promise. Therefore, you also have a 30-day return policy.
GALVANICALLY GALVANIZED: The C15E steel from our eye bolt is galvanised. This provides an even and robust surface with excellent corrosion resistance and durability.
Forged steel: the forging process allows high strength and ensures perfect structural integrity of the steel. Cavities, also known as lunkers, as with a cast steel, do not exist with us. Under load, our ring bolts thus deliver excellent performance in all your applications.
100% DIN compliant: our eye bolts comply with DIN 580 and thus meet all requirements for shape and material. On top of that, our eye screws also offer you 6-fold safety.

10,97 € 12,97 €(15% Off off)
09

AIOUHMYM

215 Piece Hex Nut Set, Self-Locking Nuts, Locking Nuts, Stainless Steel Stop Nuts, Stop Nuts for Screws, Washers, Threaded Rods, M2 M3 M4 M5 M6 M8 M10 M12 Nuts Set

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Widely used: ideal for use or maintenance when fixing instrument and equipment parts, connecting pipes and structural parts, furniture decoration, car repair, engineering, electronic products, household appliances, communication products, shops, construction and other fields
Practical design: hexagonal nuts set is used with bolts and screws to connect and attach parts, prevents bolts from being exposed or accidentally moving and falling off, with strong twist protection, better safety and stability
Package includes: 215 pieces self-locking nuts in total, including: 5 pieces m2, 50 pieces m3, 50 pieces m4, 50 pieces M5, 30 pieces M6, 15 pieces M8, 10 pieces M10, 5 pieces M12, all nylon hex nuts are stored in a storage box for easy use, store and transport can
Exquisite materials: nuts set are made of high-quality carbon steel, with exquisite workmanship, not easy to deform, not easy to break, are corrosion resistant, not easy to rust, are high strength, hard, durable and stable
Designed with nylon inserts: the design of the nylon inserts can increase the friction between nylon and thread, prevent loosening due to vibration, fill the gap between the connectors at both ends, and prevent the nut from loosening during vibration and torque

8,59 €
10

sourcing map

sourcing map Pack of 10 M6 x 20 mm 304 Stainless Steel Eye Bolts Eye Bolt Ring Nut Ring Bolt

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Use: It is usually widely used in pipeline sliders, construction steel pipe fasteners, ring nuts, etc. It is a good maintenance accessory for these components.
Material: Forged from stainless steel, high strength, fast and durable.
Eye bolts. Also known as a fish eye screw, is a screw with an eyelet on one end and a thread on the other.
Dimensions: M6 x 20 mm; eyelet centre to bottom length: 20 mm/0.79 inches; eyelet inner diameter: 5 mm/0.2 inches
Advantage: The eye hole of the screw head is shaped once mechanically or by punching, and the structural strength is high.

10,49 €