Nuts and Bolts
Loose Nuts? Your weak link is here. Sinsun nuts lock vibration out.
Don't Just Tighten, Secure. Our nuts are engineered to stay put.
The Right Fit Matters. Sinsun nuts are precision-matched for a perfect, secure hold.
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Your Perfect Match: Sinsun Nuts Engineered for Unshakeable Connections
The nut is what keeps every bolted joint together. Sinsun makes a full line of precision-engineered nuts, from standard hex and lock nuts to specialised flange and dome nuts. All of these nuts are made to fit perfectly with our bolts and meet industry standards. Find out how our dedication to high-quality materials, consistent threading, and advanced coatings makes sure that your important assemblies are vibration-resistant, won't corrode, and will hold up over time.
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Industrial-Grade Nuts & Bolts
Designed for versatility, our nuts and bolts work across diverse applications—from building sturdy deck frames to repairing industrial equipment. The high-strength steel construction withstands heavy pressure, while the corrosion-resistant coatings extend service life. Easy to install with standard tools, these fasteners create tight joints that resist loosening over time.
Nut Size (Metric) |
Thread Pitch |
Width Across Flats |
Thickness |
Material Grade (Property Class) |
Typical Proof Load (Min.) |
Coating (Standard) |
Primary Application Examples |
M6 |
1.0 mm |
10 mm |
5.2 mm |
Grade 8.8 (Class 8) |
17,050 lbf (75.9 kN) |
Zinc Plated, 5-8 µm |
Light machinery, automotive accessories, electrical cabinets. |
M8 |
1.25 mm |
13 mm |
6.8 mm |
Grade 8.8 (Class 8) |
31,350 lbf (139.5 kN) |
Zinc Plated, 5-8 µm |
General fabrication, structural brackets, agricultural equipment. |
M10 |
1.5 mm |
17 mm |
8.4 mm |
Grade 10.9 (Class 10) |
50,600 lbf (225.1 kN) |
Zinc Plated, 5-8 µm |
Industrial machinery, trailer assemblies, steel framework connections. |
M12 |
1.75 mm |
19 mm |
10.8 mm |
Grade 10.9 (Class 10) |
73,200 lbf (325.6 kN) |
Zinc Plated, 5-8 µm |
Heavy equipment, construction scaffolding, high-stress structural joints. |
M16 |
2.0 mm |
24 mm |
14.8 mm |
Grade 10.9 (Class 10) |
133,600 lbf (594.5 kN) |
Zinc Plated, 8-12 µm |
Large structural steelwork, bridge components, mining equipment. |
M20 |
2.5 mm |
30 mm |
18.0 mm |
Grade 10.9 (Class 10) |
209,400 lbf (931.5 kN) |
Zinc Plated, 8-12 µm |
Foundations, heavy industrial bases, large-scale civil engineering projects. |
Notes:
Standards: Manufactured to DIN 934 / ISO 4032 specifications.
Coating: Standard finish is blue-passivated zinc plating (5-12μm) providing 72-120 hours of neutral salt spray resistance (ASTM B117). Other finishes (Hot-Dip Galvanized, Geomet, etc.) available.
Proof Load: Minimum force the nut must withstand without permanent deformation. Values are approximate for matching property class bolts.
Use: Always pair with a bolt of equal or higher property class for optimal joint integrity.
threaded inserts for wood
● Threaded Sinsun inserts fit into holes drilled in wood to form strong, machine-threaded connection points. They are made of zinc-plated steel or brass and are more than 50% stronger than wood screws alone when pulled out. Furniture legs, tool mounts for workbench and speaker cabinets can be assembled and disassembled with this tool. It is necessary for threads to be able to withstand repeated use.
t nuts for wood
● Sinsun T-nuts provide a strong internal flange and prongs that embed into the back of wood panels. The internal machine threads allow for a bolt to be pulled tight from the opposite side. This is the standard fastener for securing table legs, leveling feet, and 80/20 aluminum extrusion frames to plywood or particleboard.
nut for a bolt
● With Sinsun nuts, bolts can be connected to each other and things can be connected together. For properties from 4 to 10, you can get them in hex, square, and flange shapes. Bolt tension is converted into clamping force, which is applied to almost all mechanical assemblies, from car engines to steel structures.
nut inserts for metal
● Sinsun nut inserts are permanently put into metal parts to make the threads stronger and more resistant to wear. There are press-in, broaching, and helical coil inserts, among other types. Designed to prevent threads from stripping in soft metals such as aluminium, they are used in aerospace panels, engine blocks, and machinery that runs frequently.
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cap nuts for light fixtures
● Sinsun cap nuts, also known as acorn nuts, have a domed top to protect exposed bolt ends. Usually made of polished brass or steel that has been plated with chrome. They are mostly used to finish the mounting bolts on public signs, chandeliers, and pendant lights. Their purpose is to prevent things from sticking and to make them look clean.
t nuts for metal
● Sinsun T-slot nuts are designed to slide into slots in extruded aluminum profiles. They are locked in place using spring-loaded ball bearings or threaded blocks. This allows for an infinitely adjustable and secure bolted connection along the entire length of the profile, which is crucial for machine frames, housings, and prototyping systems.
nut inserts for plastic
● Sinsun ultrasonic or heat-staked nut inserts are made by moulding or pressing them into plastic housings. They have strong metal threads that won't strip when you install screws over and over. The necessary fastening material for consumer appliances, electronic devices, automotive interior panels, and automotive interior panels.
barrel nut for furniture
● Cross dowel nuts, also called sinsun barrel nuts, are cylindrical pieces that go with connector bolts. They go in at a right angle to the bolt, making a strong joint that is hidden. The standard way to put together flat-pack bed frames, modular shelving, and other furniture that comes apart.
rivet nuts for sheet metal
● Rivnuts, or sinsun rivet nuts, are one-piece blind fasteners that work with thin materials. They change shape on the back when you install them with a hand or pneumatic tool, making a permanent threaded bushing. Used to add strong threads that can hold a lot of weight to car panels, electronic enclosures, and HVAC ducting where only one side can be reached.
wing nut for tie rod
● Sinsun wing nuts are nuts that have two "wings" that stick out and can be tightened by hand. You can easily change bolts without tools, which makes them great for tie rods, turnbuckles, and clamping shafts. They are often made of steel or stainless steel, which makes them great for stage rigging, tent frames, and cargo securement.
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Q: How do I decide between a regular nut & screw and a one-piece bolt?
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A: A separate nut and screw set is best when you need to hold two things together from both sides and be able to take them apart. Sinsun offers matched sets to make sure the threads work together. You can use them to make brackets, put together machinery frames, or any joint where a bolt won't work because you can't get to a threaded hole on the back.
Q: I need to add strong threads to thin metal sheets. What is a good choice?
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A: Your best bet is a Sinsun riv nut (rivet nut). You can use a simple tool to put this threaded sleeve into a hole that has already been drilled. It collapses on the back, making a permanent, load-bearing thread that works well for car panels, electronics enclosures, or anything else where the back surface can't be reached.
Q: I need to add strong threads to thin metal sheets. What is a good choice?
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A: Your best bet is a Sinsun riv nut (rivet nut). You can use a simple tool to put this threaded sleeve into a hole that has already been drilled. It collapses on the back, making a permanent, load-bearing thread that works well for car panels, electronics enclosures, or anything else where the back surface can't be reached.
Q: I'm just getting started with machining.What are the main types of nuts and bolts I should stock?
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A: Begin with the basics of Sinsun: Bolts come in two types: hex head (for general use) and socket head (for low clearance). Hex nuts (standard), nylon lock nuts (vibration-proof), and flange nuts (no separate washer) are all types of nuts. Having these kinds in common sizes (M4, M5, M6, and M8) will be enough for 80% of general assembly and prototyping work.
Q: Why do bills of materials often fasteners nuts separately?
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A: The nut is an important part that holds the load, not just an extra part. You should tell the store what grade of Sinsun nuts you need (for example, Class 8 or 10) to make sure they are the right strength for the bolt. The weakest part is a weak nut on a strong bolt. It can break when it is under load, ruining the whole joint.
Q: How do you best attach a panel to a square tube frame?
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A: Use a Sinsun U-nut, which is also known as a saddle clip nut. It slides over the tube's edge, and its two prongs hold onto the inside. The "U" shape makes the thread stable and not able to turn when you tighten the screw. It's a quick and easy way to clean electrical cabinets, shelves, and car trim.
Q: Are rivnuts and threaded rivet nuts the same thing?
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A: Yes, they are. The full name for this Sinsun product is "threaded rivet nut," but in the industry, it's often called "rivnut." It's a blind fastener that comes in one piece and makes a strong, permanent internal thread in materials that are too thin to tap.
Q: What makes a blind rivet nut different from a pop rivet?
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A: A Sinsun blind rivet nut (rivnut) has a threaded inner sleeve, but a pop rivet is a solid pin that isn't threaded. To join things together easily, use a pop rivet. A blind rivet nut is a good choice when you need to make a strong bolt-down point, like when you need to attach a hinge or a bracket and can only work from one side of the material.
Q: I can only get to the front of my workpiece. What kind of fastener makes a nut on the back?
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A: You need a Sinsun blind nut. Rivet nuts (rivnuts) and well nuts are two examples of products in this group. They are put in from the front, and then a tool either expands or compresses them to lock them in place on the back. This makes a captive threaded point that doesn't need access from the back to be installed.
Q: I have a round nut with grooves on the side. What kind of tool do I need?
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A: That nut looks like a circlip or a spanner. To make the notches work, you need a Sinsun spanner nut (pin wrench) with pins that fit. The outer diameter of these nuts should be smooth and low-profile, so that they can be used on bearing assemblies, grinding wheels, and precision shafts.
Q: What kind of nut is used on a linear motion system with high precision?
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A: That's a ball screw nut from Sinsun. With recirculating ball bearings rolling along the screw's thread, more than 90% of its rotation turns into smooth, low-friction linear motion. CNC machines, 3D printers, and robotic actuators all need to be very precise and have very little backlash.
Q: What kind of nut is used on a linear motion system with high precision?
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A: That's a ball screw nut from Sinsun. With recirculating ball bearings rolling along the screw's thread, more than 90% of its rotation turns into smooth, low-friction linear motion. CNC machines, 3D printers, and robotic actuators all need to be very precise and have very little backlash.
Q: What kind of fastener should I use if I need to tighten and loosen something by hand a lot?
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A: Use Sinsun wing nuts or thumb nuts. Their big, wing-like protrusions give you a lot of grip for tightening by hand. They're great for access panels, light fixture covers, jigs, clamps, or any other use where you need to be able to quickly and easily change or remove them without using tools.
Q: The threads keep coming off of my soft aluminium part. What can I do to fix it?
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A: Use a solid bushing or a helical coil insert to make a Sinsun threaded nut insert. You drill out the old threads, make the hole bigger, and then either screw or press this hardened steel insert into place. It makes a new thread that is stronger than the old one, doesn't wear out, and can be used over and over again.
Q: What is a good locknut that can be used over and over again in cars that vibrate a lot?
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A: A Sinsun Stover nut (or elliptical offset locknut) is a great choice. The top part of the nut is slightly oval-shaped and is made of metal. This makes the bolt threads rub against each other (prevailing torque) as it is tightened, which keeps it in place. It can be used more than once and is better at handling heat and vibration than nylon inserts.
Q: Which part of my lathe works with the lead screw to make threads?
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A: That's the Sinsun split nut, which is also called a half nut. It's a nut that has been cut in half along its length. The two halves of the lathe carriage close around the lead screw when you pull the lever. This connects the motion of the carriage to the rotation of the spindle, which cuts precise threads.
Q: What part of my lathe works with the lead screw to cut threads?
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A: That's the Sinsun split nut, which is also known as a half nut. This is a nut that has been cut in half along its length. When you pull the lever, the two parts of the lathe carriage come together around the lead screw. This links the spindle's rotation to the movement of the carriage, which cuts precise threads.
Q: What kind of nut is best for attaching legs to wood cabinets?
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A: For wood, you will need a wood nuts from Sinsun. The base is wide and flat, and the prongs are sharp and hammer into the back of the wood. The bolt goes through the nut's barrel from the other side and pulls the base of the T-nut tightly against the wood. A very strong connection is made that spreads the weight.
Q: I need a nut that fits all the way into a channel or slot. What should I use?
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A: A Sinsun flat nut (also called a square nut or low-profile hex nut) is made for this. It is thin and fits into T-slots of extrusion profiles or machined channels. You slide it into position, and it won't rotate, allowing you to tighten a bolt from above—common in framing, machining, and fixture building.
Q: I see a round nut with holes or grooves on its face. How does it get tighter?
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A: That is a Sinsun ring nut. You can use either a C-wrench that fits into the notches or a pin spanner wrench that fits into the holes. This design smooths out the outside, and it's often used to preload bearings on a shaft or hold parts in place where a regular wrench can't reach.
Q: What kind of nut can also be used as a spacer or shaft collar?
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A: A Sinsun collar nut, which is a flanged hex nut with a longer barrel. The collar, which is the long, unthreaded part, spaces out parts on a shaft or bolt, lines them up, and protects the threads. Power transmission systems and precision assemblies often use it.
Q: This may seem like a simple question, but what is the main job of a threaded nut?
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A: The main job of a Sinsun threaded nut is to change the tension in a bolt into clamping force between parts. When you turn the nut tighter, it moves down the threads of the bolt, pulling the joint together. The clamping force creates friction, which is what keeps your assembly from moving and keeps it together.
Q: When do I need to use metal nuts instead of plastic ones?
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A: Always use Sinsun metal nuts when you need structural integrity, when the temperature is above 250°F/120°C, or when you need a lot of clamping force. Some uses are engine mounts, suspension parts, structural steel, and any assembly that has to deal with a lot of stress, vibration, or heat where plastic would melt or creep.
Q: What does "ss nut" mean, and when is it necessary?
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A: "SS nut" means stainless steel nut. Stainless steel Sinsun nuts (normally 304 or 316 grade) provide excellent corrosion resistance in harsh environments. For example, marine applications, food processing, chemical plants, and outdoor structures are all perfect applications for Sinsun stainless steel nuts (typically 304 or 316 grade). They prevent rust staining and failure, though they are softer than high-tensile steel nuts.
Q: Can you clarify: is a threaded rivnut the same as a rivet?
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A: No, it's not the same. Both are installed with a "pulling" tool, but a Sinsun threaded rivnut leaves behind a threaded hole that can hold a screw or bolt. A regular rivet is just a solid pin that goes through a hole to hold things together. A rivnut makes a nut, and a rivet is a permanent pin that doesn't have any threads.
Q: Do I need to use grade 8.8 bolts with grade 8.8 nuts?
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A: Yes, for sure. Always use a Sinsun nut that is the same grade or higher (for example, an 8.8 bolt should have an 8-grade nut). When the bolt is under full tension, lower-grade nuts can strip or bend, making a high-strength bolt useless. Bolts need nuts to work together to make a safe and secure connection. Never settle for less than the best nuts.
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