Bolts
Shake, Rattle, Fail? Not with our bolts.
Sinsun bolts deliver maximum strength, zero compromise.
Secure in Seconds, Built for Years. The last bolt you'll ever need.
Sinsun Bolts: Engineer Your Unshakable Foundation
Where every bad situation, load, and vibration has a match. Sinsun high-strength bolts are designed to eliminate possible failure points, protecting your crucial structures. No matter if your projects are in the automotive or aerospace industries, we can provide the accuracy, strength, and peace of mind they need. After all, the part that holds everything together shouldn't be the weakest.
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Durable Bolts – Industrial Grade
Crafted from high-tensile steel, our bolts resist wear and vibration. Galvanized or stainless steel finishes suit indoor/outdoor use, perfect for pairing with washers in equipment repair and building projects.
Sinsun Standard Metric Bolt Size Chart
This chart outlines the common dimensions for Sinsun’s standard Hex Head Bolts (e.g., property classes 4.8, 8.8, 10.9). All measurements are in millimeters (mm).
Nominal Diameter (d) |
Thread Pitch (Standard) |
Head Width (Across Flats, s) |
Head Height (k) |
Typical Length Range (l) |
M6 |
1.0 mm |
10 mm |
4.0 mm |
12 - 100 mm |
M8 |
1.25 mm |
13 mm |
5.3 mm |
16 - 120 mm |
M10 |
1.5 mm |
17 mm |
6.4 mm |
20 - 150 mm |
M12 |
1.75 mm |
19 mm |
7.5 mm |
25 - 200 mm |
M16 |
2.0 mm |
24 mm |
10.0 mm |
30 - 250 mm |
M20 |
2.5 mm |
30 mm |
12.5 mm |
40 - 300 mm |
Key Notes:
Length (l): Defined as the distance from under the head to the end of the bolt.
Other Sizes: Sinsun also manufactures bolts in sizes including M3, M4, M5, M14, M18, M22, M24, and M30. Contact us for specifications.
Available Variations: Lengths, property classes (strength grades), and surface finishes (e.g., zinc-plated, hot-dip galvanized, black oxide) can be specified based on your project requirements.
Compliance: Our standard bolts are manufactured to common international dimensional standards.
expansion bolts for concrete
● An expansion bolt from Sinsun creates a mechanical lock in concrete with high strength. After tightening in the pre-drilled hole, the sleeve expands, generating friction and interlock.As they provide immediate load capacity, with typical ultimate tensile strengths starting at 15 kN for a 10mm bolt, they are excellent for anchoring handrails, machinery, and structural brackets.
toggle bolts for drywall
● Sinsun toggle bolts are the best way to attach something to hollow drywall without a stud. After insertion, the wings that are spring-loaded open behind the wall and spread the weight over a large area. You can safely hang cabinets, large mirrors, and television mounts using our bolts that are made of zinc-plated steel and can handle a great deal of weight. Each bolt can hold up to 25 kg in 12.5mm drywall.
anchor bolts for wood
● Sinsun anchor bolts are heavy-duty fasteners, like through-bolts with washers or large diameter lag screws, designed for handling significant loads.They have coarse threads and are very strong, so they are very resistant to being pulled out.They are therefore crucial to construction and decking projects, such as securing ledger boards to wooden beams and securing metal brackets to timber frames.
j bolts for concrete
● For concrete foundations, Sinsun J bolts are used as anchoring rods in the form of L-shaped sections.. The hooked end is embedded in wet concrete, curing to form a permanent, high-strength anchor point resistant to uplift forces.They are commonly made of hot-dip galvanized steel and are used to anchor structural columns, light poles, and heavy equipment bases permanently.
lag bolts for deck
● The Sinsun lag bolts for decking feature a hex head for superior holding power in timber.. Having thick diameters and aggressive thread patterns, these decks resist constant shear and withdrawal forces. As long as washers are used to prevent heads from sinking, they are suitable for securing critical framing members such as ledger boards to house rims or anchoring post frames.
Q: How can I choose the best sliding mechanism for a simple outdoor gate?
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A: Sinsun's 304 stainless steel sliding bolt is perfect. Its body is zinc-plated, which means it won't rust for more than five years in normal weather. This makes it a safe way to lock up sheds and fence gates without using tools.
Q: How can I quickly fasten a panel without using tools?
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A: A Sinsun hand-tightened fastener with a lever action is what you need. It lets you quickly open and close machine guards or inspection covers, which saves time when doing maintenance.
Q: What's the strongest way to attach a rack to a masonry wall?
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A: Sinsun's Concrete Bolts, made from grade 8.8 steel, are installed into a pre-drilled hole. Once tightened, they provide a permanent hold with a pull-out strength exceeding 5,000 lbs in solid concrete.
Q: What makes a door lock hard to break into?
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A: A Sinsun Dead Bolt with a 1-inch throw is made of hardened steel and goes deep into the frame. When used with a reinforced strike plate, it makes it much harder for people to kick in.
Q: What's a cheap way to make an inside door safer?
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A: You only need four screws to install a Sinsun Door Bolt surface-mounted. It provides extra privacy and is a simple visual deterrent for offices and storage rooms.
Q:How do I secure an inactive leaf on a double door?
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A: Sinsun recessed lock goes into the edge of the door. When you turn it on, Flushbolt goes into the head and threshold, making it safe while keeping it clean and out of sight.
Q: What is the most common type of fastener used in general construction?
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A: The Sinsun standard Hexagon Bolt comes in more than 50 sizes, from M4 to M30. Its six-sided head lets you tighten it with a wrench from different angles.
Q: How can I make it easier to order parts for an assembly project?
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A: Get Sinsun's pre-matched fastener kits. Each kit has the right Nut Bolt Washert , which makes sure they fit right and cuts down on the number of parts that need to be managed by 60%.
Q: How do you recommend putting two thick timber beams together?
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A: Use a Sinsun Through Bolts that goes through both pieces and has a nut on each end to hold them together. This makes a force that is better than screws or nails.
Q: What kind of latch would be best for heavy wooden barn doors?
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A: The Sinsun surface-mounted latch is 300mm long and made of stainless steel. Due to its simple design, tower bolt can withstand a lot of impacts and bad weather, and it requires little maintenance over the years.
Q: What can I do to keep a fastener head from sinking into soft wood?
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A: Use a Sinsun Washer Bolt that has a flat disc built into the head. This spreads the pressure over a 19mm area, which stops pull-through and cuts out the need for a separate assembly step.
Q: I need a metric fastener that can be used for a lot of different things in the automotive industry. What size?
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A: A lot of people choose the Sinsun 10 mm Bolt. It has a 10mm shaft diameter and comes in lengths from 20mm to 100mm. It can be used for anything from brackets to engine parts.
Q: What grade should the most important parts of the suspension be?
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A: Sinsun's Class 10.9 Bolt fasteners are made to hold up under heavy, moving loads in cars and machines. They can hold at least 1040 MPa of tension.
Q: Can you make things with a 12mm bolt?
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A: The Sinsun M12 bolt. The 12mm thick core is great for heavy framing and support brackets because it can support about 40% more weight.
Q: What provides a finished look for a wooden deck railing?
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A: Sinsun's smooth, domed head Black Carriage Bolts with a black finish. The square section under the head locks into wood, preventing spin during nut tightening.
Q: What keeps a wheel from coming off a spinning shaft?
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A: A Sinsun Axle Boltn with a threaded end and a hole drilled in it for a split pin. Its design allows it to withstand a lot of shear force, preventing the wheels and gears from coming loose.
Q: How do I pick the right drive style for my needs?
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A: Sinsun offers different Bolt Head Types, such as hex for torque, socket for low clearance, and slotted for simple tools. If you can reach it easily and it requires a lot of force to tighten it, you can choose.
Q: What are the differences between common thread pitches?
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A: Sinsun makes different Bolt Thread Types: both coarse (standard) and fine threads. In metal where the depth of engagement is limited, fine threads are better because they are about 10% less likely to come loose.
Q: What tool do you need to install it correctly?
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A: A Sinsun hand tool that fits right. Using a 17mm Bolt Wrench on an M10 fastener, for instance, makes sure that the head is fully in contact so that the right amount of torque can be applied without damaging it.
Q: What kind of Button Head Bolt has a low, smooth profile for a jig?
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A: A Sinsun low-profile socket head with a rounded top. It sticks out only a few millimetres, which makes it less likely to get stuck and lets you use a hex key to get a good grip.
Q: What is a strong choice for a metal security gate?
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A: The Sinsun latch for an enclosed gate. The Box Bolt goes into a metal box that is completely covered, so it is safe from the weather and from being opened with tools.
Q: How do I keep a tall gate from coming off its hinges?
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A: Put in a Sinsun Cane Bolt that fits into a hole in the ground. A 600mm long rod keeps the gate's free edge from lifting and pushing.
Q: What do you use to fasten things together tightly in tight spaces?
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A: Sinsun internal Cap Bolt. Its cylindrical head with a hex socket lets it clamp down very hard in tight spaces, which is common in engine assemblies.
Q: How do you attach thick nameplates or leather panels to the back?
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A: Sinsun's sets of Chicago Bolts. There is a hollow post between the materials, and a machine screw goes through it from the other side. This makes both sides look nice.
Q: What kind of connector do linkages use for pivot points?
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A: Sinsun Clevis Bolt with a head on one end and a hole in the other. A split pin through the hole keeps it in place and lets pulleys or hydraulic rods move freely.
Q: What holds metal plates to wood in timber frame building?
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A: Sinsun's Connector Bolts with a special diameter that work with toothed plates. They are usually 1/2" in diameter and have a certain length that makes the joint as strong as possible.
Q: How do I connect two threaded rods together?
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A: Use a Sinsun threaded coupler. Coupling Bolt has threads on the inside and is hollow. It connects two rods securely and lets you change the length of the rods when working with concrete or plumbing.
Q: How do I make a fastener fit on metal?
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A: Use a Sinsun Countersunk Bolts with a cone-shaped bottom. In order to be safe and aerodynamic, the hole is 82 degrees, which makes the finish smooth.
Q: What makes it hard and dangerous to start Cross Threaded Bolt?
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A: Not putting the threads in the right order. Sinsun's consistent rolling and packaging lowers this risk. This can strip parts and cut holding power by more than 70%.
Q: What makes visible furniture joints look smooth and finished?
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A: Sinsun Cup Head Bolt with a head that is completely smooth and round. It adds a decorative touch, and the square neck under the head keeps it in place while you put it together.
Q: What kind of Dome Head Bolts is both pretty and easy to hold?
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A: The high, polished, rounded head style of Sinsun. The tall shape makes it easy to hold a wrench and adds a decorative touch to visible fittings.
Q: How do you pull two parts together from the middle?
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A: Sinsun Double Threaded Bolt with threads that go in the opposite direction on each end. When you turn the centre, it pulls both sides in at the same time. This is used in some clamps and fixtures.
Q: What are the secret connectors that come with flat-pack furniture?
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A: Sinsun's special Furniture Bolts. When a metal plate is pulled into a threaded insert with an 8mm hex key, a strong joint is formed inside the panel.
Q: What kind of fastener fits perfectly into metal?
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A: Sinsun Flat Head Bolts with a flat top that fits into a hole. The top fits perfectly level with the surface when it is put in a hole that has already been countersunk.
Q: What is a forged loop used for? To lift or tie down tools?
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A: Sinsun I Bolt with its Working Load Limit (e.g., 500 kg) clearly stamped on it. It is screwed into a support that holds ropes, chains, or cables in place.
Q: Where can I find custom lengths that aren't standard?
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A: Sinsun will send you Long Bolts up to 2000mm if you ask for them. In construction, these are used as through-rods, and in machinery, they are used to make custom spacers.
Q: What keeps ropes on a dock in place for good?
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A: Sinsun Ring Bolt on a threaded shank. It can be permanently set into concrete for mooring or rigging because it is made of galvanised steel.
Q: How do you make a strong joint when you can only get to one side?
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A: Sinsun Rivet Bolt, It goes in from the front, and a pulling tool makes the back sleeve bigger, making a bulb that holds the back surface tightly.
Q: How do you keep loose rocks from falling in a tunnel?
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A: Sinsun's high-strength Rock Bolts, which can be up to 20mm in diameter, are grouted into holes that have been drilled. They work like tendons to strengthen the rock mass and can hold more than 10 tonnes.
Q: What kind of old-fashioned fastener is used in restoration?
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A: Sinsun Round Head Bolt with a slotted drive and a semi-spherical head. It looks like fasteners from the early 20th century, so you can use it to fix old machines or furniture in a real way.
Q: What makes a door close and lock by itself?
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A: Sinsun Spring Bolt that has a spring inside. When the angled face hits the strike plate, it pulls back and then springs forward into the hole to keep the door closed.
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