Tunnel Segment Bolts, Precast Channels & High-Strength Fasteners
Huilang is a fastener manufacturer based in Yongnian, Handan, Hebei — China's fastener production hub. We supply engineered fasteners for shield tunnel (TBM), metro, utility tunnel, curtain wall and steel structure projects, working from customer drawings.
Application guide: metro & shield tunnel linings
Follow the connection from ring joint to services and cast-in interfaces: curved segment bolts, matched nuts, cast-in channels and embedded parts.
Technical note: segment bolt torque
How to set preload and tightening values for M24–M36 segment bolts, and how the coating changes the torque coefficient.
What we supply
Tunnel Segment Bolts
Curved (arc) bolts and longitudinal bolts for shield tunnel lining, with matched nuts and washers.
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Precast Channels
Cast-in C-profile channels with T-bolts for tunnel services, metro, pipe racks and curtain wall supports.
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High-Strength Bolts
Grade 8.8 and 10.9 hex bolts and connection sets for steel structures and heavy equipment.
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Embedded Parts
Anchor plates, anchor bars and welded embedments cast into concrete for later connections.
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Nuts & Washers
Hex nuts, flange nuts, nylon-insert lock nuts, plain and spring washers matched to each bolt.
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Stamping Parts
Pressed brackets, plates, spacers and connector pieces from sheet or strip steel, made to drawing.
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About the Factory
A fastener plant in Yongnian, Handan: forging, heat treatment and coating under one roof since 2016.
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Quality & Inspection
Material certificates, in-house testing and third-party hardness, tensile and salt-spray checks.
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Contact & RFQ
Send a drawing or specification list and we will quote price, tooling where needed, and lead time.
Read more →Why projects buy from us
- Drawing-based production. Curved bolts, non-standard lengths, special heads and non-standard coatings are all made to the customer's drawing rather than from a fixed catalogue.
- In-house process chain. Cold forging, thread rolling, heat treatment and surface coating are controlled in our own production flow, which keeps properties consistent between batches.
- Coating choice matched to the environment. Dacromet (zinc flake), hot-dip galvanizing, phosphating and electroplating are selected according to humidity, chloride exposure and service life.
- Inspection before shipment. Tensile, hardness and coating checks are routine; third-party testing and material certificates can be arranged when the contract requires it.
- Export documentation. Commercial invoice, packing list and certificate of origin can be provided; pallets can be fumigated for sea freight on request.
Fastener systems by application
Metro & shield tunnels
Curved segment bolts, matched nuts and washers, cast-in channels and embedded parts for precast tunnel linings.
Tunnel fasteners →Utility tunnels & common ducts
Channels, brackets and embedded plates for cable trays, pipe supports and equipment frames in enclosed utility tunnels.
Utility tunnel fasteners →Road & rail sound barriers
Anchor plates, U-bolts and high-strength bolts for sound-barrier columns, panels and overhead contact-system supports.
Sound barrier fasteners →Curtain walls & facades
Cast-in channels, T-bolts, stainless fixings and embedded plates for bracket adjustment and facade movement.
Curtain wall fasteners →How to order
Send us a drawing or a specification list containing at least the following, and we will quote against it:
| Item | Why we need it |
|---|---|
| Product type and standard | e.g. segment bolt to drawing, hex bolt to DIN 933 / ISO 4017 / GB/T 5783 |
| Nominal diameter and thread | Metric (M16, M20…) or inch (3/8-16 UNC…); pitch or TPI |
| Length and, for curved bolts, the bending radius | Determines material consumption and bending tooling |
| Grade / property class | 8.8, 10.9, A2-70 or SAE Grade 5/8 |
| Coating and salt-spray requirement | Dacromet, hot-dip galvanized, phosphated, plain — and white rust or red rust |
| Quantity and delivery schedule | For tooling, packing and shipping arrangement |
Contact
Sales and technical support: +86 185 3100 8199
Address: Yongyang Street, Southwest Development Zone, Yongnian District, Handan, Hebei, China
Request a quotation or send your drawing
Tell us the specification, grade, coating and quantity — or send a PDF/DWG drawing and we will come back with price and lead time.
Tel / WhatsApp / WeChat: +86 185 3100 8199
Email: sales@huilang.top
FAQ
- Can you produce to our drawing?
- Yes. Most of our tunnel and embedment products are made from customer drawings. Send a PDF or DWG with dimensions, tolerance, material, grade and coating, and we will confirm feasibility, tooling and lead time before quoting.
- What is the minimum order quantity?
- It depends on the product and whether new tooling is needed. Standard hex bolts and nuts have a lower minimum than curved bolts or custom embedments. Send the item list and we will quote with the applicable MOQ.
- Do you provide material or test certificates?
- Yes, material certificates and mill certificates can be supplied, and third-party inspection can be arranged when the contract requires it.
- How are goods packed for sea freight?
- Normally in cartons or bags on fumigated pallets, banded and stretch-wrapped. Packaging can follow your marking and pallet requirements.