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العربية Threaded rod looks simple, but RFQs for this product often go wrong because key details are missing. A buyer may write “M12 threaded rod, zinc plated” and expect an accurate quote. In reality, the supplier still needs to confirm length, pitch, material grade, coating, tolerance, quantity, and packing.
Before sending an RFQ, it is worth reading the specification carefully. This avoids wrong pricing, incorrect stock checks, and delays during production.
For common threaded rod supply, buyers can review XZ Fastener’s threaded rod and standard fasteners pages.
1. Start With Diameter and Thread System
Metric and inch threads are not interchangeable
The first detail is the thread system. Metric threaded rods are marked by diameter and pitch, such as M10 × 1.5. Inch rods are usually described by diameter and threads per inch, such as 1/2″-13 UNC.
| Specification | Meaning |
|---|---|
| M12 × 1.75 | Metric thread, 12 mm diameter, 1.75 mm pitch |
| M12 × 1.25 | Metric fine thread |
| 1/2″-13 UNC | Inch coarse thread |
| 1/2″-20 UNF | Inch fine thread |
If pitch is not specified, the supplier may assume standard coarse thread. That assumption can be risky when matching nuts or tapped holes.
2. Confirm the Length
Standard length and cut length are different
Threaded rods are often supplied in 1 m, 2 m, or 3 m lengths. Some projects require cut-to-length rods.
| Length Type | Typical Use |
|---|---|
| 1,000 mm | General stock and construction |
| 2,000 mm / 3,000 mm | Distributor inventory |
| Cut length | OEM and project installation |
| Custom length | Anchoring or equipment assembly |
For cut rods, specify whether chamfered ends are required. This small detail affects installation speed and nut engagement.
3. Check Material and Strength Grade
Strength must match the application
Material is not only about cost. It affects load capacity, corrosion behavior, and compliance.
| Material / Grade | Common Use |
|---|---|
| Carbon steel Class 4.8 | General light-duty fastening |
| Carbon steel Class 8.8 | Higher-strength applications |
| Stainless steel A2-70 | General corrosion resistance |
| Stainless steel A4-70 / A4-80 | Marine or chemical environments |
| ASTM A193 B7 | High-temperature and pressure systems |
For material references, see XZ Fastener’s carbon steel fasteners and stainless steel fasteners pages.
4. Read the Surface Finish Requirement
Coating affects corrosion and thread fit
Surface finish should be clearly stated in the RFQ.
| Finish | Typical Purpose |
|---|---|
| Plain | Indoor or secondary processing |
| Zinc plated | Basic corrosion protection |
| Hot-dip galvanized | Outdoor construction |
| Black oxide | Indoor machinery |
| PTFE coating | Low friction or special environments |
For coated threaded products, buyers can review XZ Fastener’s various coated fasteners and hot-dip galvanizing pages.
5. Do Not Ignore Tolerance and Fit
Coated rods may need extra clearance
Threaded rod must fit nuts smoothly. If coating thickness is high, especially with hot-dip galvanizing, thread fit must be checked.
| Issue | Possible Result |
|---|---|
| Wrong pitch | Nut cannot assemble |
| Excess coating | Tight thread fit |
| Poor straightness | Installation difficulty |
| Rough thread | Slow assembly or thread damage |
For critical orders, ask for nut-fit testing before shipment.
6. RFQ Checklist for Threaded Rod
Send complete details from the beginning
A clear RFQ should include:
- Thread system: metric or inch.
- Diameter and pitch.
- Rod length.
- Material and grade.
- Surface finish or coating.
- Quantity.
- Nut and washer requirement, if needed.
- Tolerance or straightness requirement.
- Certificate requirement.
- Packing method and shipping destination.
Final Recommendation
Reading threaded rod specifications before sending an RFQ prevents most common purchasing errors. The key details are diameter, pitch, length, material, coating, tolerance, and quantity.
A complete specification allows the supplier to check stock, quote accurately, and confirm production feasibility. For project-based threaded rod requirements, send full specifications through XZ Fastener Contact Us.