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18 Sep , 2025
Through Bolt for Concrete
A through bolt is a concrete anchor you insert through the fixture into a drilled hole. Tighten the nut → the cone expands the sleeve → the bolt grips the concrete. Use M8–M10 for light/medium fixtures, M12–M16 for machinery/steel, and M20 for very heavy loads. Tighten to the recommended torque for safety.
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A through bolt is a mechanical anchor for fixing base plates, frames, railings, cable trays, HVAC supports, and machinery into concrete. It saves time because you install it through the fixture—no extra steps. FERRY Through Bolts are built with an optimum cone angle (controlled expansion), high dimensional accuracy (consistent batches), and corrosion-resistant finish (long life on site).
If you’re between two sizes and the design allows, go one size up. It’s safer and easier to inspect.
Notes: “Fixture hole” = hole in your plate/bracket. “Minimum substrate” = minimum concrete thickness. Measurements may vary within normal tolerances.
| Bolt | Length (mm) | Thread (mm) |
|---|---|---|
| M8 | 50 | 14 |
| M8 | 65 | 25 |
| M8 | 80 | 40 |
| M8 | 115 | 65 |
| Bolt | Length (mm) | Thread (mm) |
|---|---|---|
| M10 | 65 | 22 |
| M10 | 80 | 30 |
| M10 | 95 | 46 |
| M10 | 115 | 65 |
| M10 | 130 | 80 |
| Bolt | Length (mm) | Thread (mm) |
|---|---|---|
| M12 | 80 | 30 |
| M12 | 100 | 40 |
| M12 | 120 | 60 |
| M12 | 135 | 75 |
| M12 | 150 | 90 |
| Bolt | Length (mm) | Thread (mm) |
|---|---|---|
| M16 | 105 | 55 |
| M16 | 140 | 60 |
| M16 | 180 | 100 |
| M16 | 220 | 140 |
| Bolt | Length (mm) | Thread (mm) |
|---|---|---|
| M20 | 125 | 65 |
| M20 | 160 | 65 |
| M20 | 200 | 100 |
| M20 | 300 | 100 |
Buying for projects or annual consumption? Ask for bulk pricing and a size-mix that fits your BOQ to reduce waste.
FERRY International, through bolts, delivers precise, corrosion-resistant, high-load anchoring you can trust—backed by consistent specs, fast through-fixing, and bulk-ready pricing across India.
Enquire Now • WhatsApp Now • Request a Callback
📞 011-41410882
Tell us your fixture thickness, concrete grade, and approximate load—we’ll determine the right M-size, length, and torque, and build a cost-efficient bulk mix.
Is a through bolt good for cracked concrete?
Use according to the engineer’s design and site conditions. Through bolts provide a strong fixing in sound concrete; follow torque specifications and manufacturer's guidance.
What torque should I use?
M8: 15 Nm, M10: 25 Nm, M12: 45 Nm, M16: 110 Nm, M20: 180 Nm (per FERRY specs above).
Can I reuse a through bolt?
No. Treat them as single-use anchors.
Through bolt or chemical anchor?
For speed and repeatability, through bolts are great. For edge-distance issues, high loads in weaker concrete, or specific design cases, your engineer may pick chemical anchors.
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