Timber bolts are also referred to as dome head, fender head, mushroom head bolts, mat bolts, mat rods. They are referred to as economy bolts. They are used in marine and wood applications. The underside of the large, rounded, low-profile head of a timber bolt has two nubs or fins that prevent the bolt from turning in the timber. An oversized timber bolt is usually used with a hex nut and a flat washer.
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307A Timber Bolts |
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Material: |
Carbon Steel |
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Standard: |
Drawing |
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Head type: |
Flat, Dome |
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Fin type: |
2, 4 |
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Grade: |
A307A |
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Thread size: |
1/2"-1 1/2" |
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Length: |
Up to 96" |
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Coating: |
Plain, Hot-dip galvanizing |
FAQ
We will respond to your inquiry within 12 hours on weekdays.
We specialize in screws, bolts, and nuts for wooden furniture and home applications.
They are widely used in construction, woodworking, metalworking, and interior installation.
Yes, we can. We develop and produce products based on drawings or samples provided by our customers. Custom Plain/ HDG Timber Bolts.
More than 80,000 tonnes of fasteners and hardware-related products are exported each year. We are A307 Grade A Timber Bolts Manufacturers in China
We conduct inspections after each process. For finished products, we conduct a comprehensive inspection based on customer requirements and international standards.
About Us
Established in 2004, Jiaxing Sini Fastener Co., Ltd. has over 20 years of experience in the fastener field. We are a well-known leading exporter of bolts and screws. Carbon Steel Timber Bolts Factory in China. Our specialization lies in supplying both standard and custom-engineered bolts and screws.
In addition to manufacturing products that meet DIN and IFI standards, SINI FASTENER also has the capability to produce according to customer-specific designs and drawings. Most items are available in steel and stainless steel, and can be provided in both inch and metric sizes.
• Bolts: Manufactured in diameters from 3/16” to 1 1/2” (5mm–52mm) and lengths from 1/2” to 60” (10mm–1500mm). Our most competitive products include carriage bolts and round head bolts.
• Screws: Produced in diameters from #4 to 1/2” (3.5mm–12mm) and lengths from 1/2” to 60” (10mm–1500mm). Our key advantage lies in corrosion-resistant construction screws.
With production facilities located in Haiyan, Zhejiang and Lianyungang, Jiangsu, we serve customers across North America, South America, and Europe. Our diverse client base spans industries such as construction hardware, machinery, machine tools, electrical appliances, and furniture..
SINI FASTENER is ISO 9001 certified, ensuring consistent quality and reliability.
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Industry Knowledge
ASTM A307 Grade A is a low-carbon steel specification with a minimum tensile strength of 60,000 psi. It does not call for a specified yield strength or a heat-treated core. That makes A307 Grade A timber bolts a general-purpose fastener, not a high-strength one.
For timber work, that is usually enough. Wood fails in bearing and splitting long before a mild steel bolt reaches its limit, so paying for a higher grade rarely improves the joint. The timber, not the steel, sets the capacity of most bolted wood connections.
Where the grade falls short is preloaded or slip-critical steel connections. Those call for heavy hex structural bolts, not economy hardware. Marine piers, retaining walls, bridge decking, timber trusses and fence framing all sit comfortably inside the A307 range.
Plain carbon steel is cheapest, but it starts to rust the first time it gets wet. Use it only for dry, interior framing or for temporary structures that will be dismantled.
Anything outdoors, near salt water, or in contact with treated lumber should be hot-dip galvanized (HDG). The zinc layer is far thicker than electroplating, and it keeps protecting cut edges and scratches through sacrificial corrosion. Modern wood preservatives can be aggressive toward bare steel, which is one more reason to specify HDG for treated timber.
One detail catches buyers out. Galvanizing thickens the threads, so the nut must be tapped oversize to match. Order the bolts and nuts together, or confirm the pairing in advance, rather than mixing suppliers. Sourcing carbon steel timber bolts in either plain or HDG finish from one supplier keeps that fit consistent.
A timber bolt has a wide, low dome head, sometimes called a fender or mushroom head. Two small fins under the head bite into the wood and stop the bolt from spinning while you tighten the nut. That is why one person can install it with a single wrench and no access to the head side.
The standard range for this product is shown below. Flat heads suit surfaces that must sit flush, while dome heads are the usual choice where a smooth, snag-free profile matters, such as on docks and fender boards.
| Parameter | Option |
|---|---|
| Head type | Flat, dome |
| Fin type | 2 fins, 4 fins |
| Thread diameter | 1/2" to 1 1/2" |
| Length | Up to 96" |
| Coating | Plain, hot-dip galvanized |
Choose the length by adding the total thickness of the timber stack, the washer, the nut, and at least one to two full threads of protrusion. Four-fin versions grip harder in dense or wet timber, where two fins may not hold under torque. Non-standard lengths and drawings can be made to order.
Most timber bolt failures trace back to the installation, not the bolt. A few habits prevent nearly all of them.
Timber shrinks as it dries, and a joint that was tight on day one can loosen within weeks. Recheck and retighten the nuts after the first drying season, particularly on green or freshly treated lumber. For large projects, add this to the maintenance plan from the start.
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