The M40 40 mm MS hex bolt M39x120 bright zinc plated 90 kg finds frequent use in Howrah across structural steel assembly, plant maintenance, and fabricated frameworks. This specification delivers a corrosion resistant mechanical fastener suited for moderate load environments and workshop conditions typical of the region.
Suppliers in Howrah often highlight standardized dimensions, surface brightness from electroplating, and a 90 kg reference weight per batch as practical indicators for bulk procurement planning. The following sections detail specifications, applications, and handling guidance for this component.
| Product Code | M39x120 | Head Type | Hex |
|---|---|---|---|
| Diameter | 40 mm | Material | Mild Steel (MS) |
| Length | 120 mm | Finish | Bright Zinc Plated |
| Batch Weight | 90 kg | Application | Fabrication, Repair |
| Market | Howrah | Corrosion Resistance | Enhanced by zinc plating |
Product Specifications and Standards
Metric Dimensions and Tolerances
The M40 40 mm MS hex bolt M39x120 adheres to coarse thread metrics with a 40 mm shank diameter and an overall length of 120 mm. These dimensions align with regional workshop expectations in Howrah for steel erection and maintenance tasks.
Mechanical Properties and Material Grade
Manufactured from mild steel, this hex bolt provides adequate tensile strength for general structural use. The bright zinc plating improves surface appearance and offers moderate protection against rust in humid environments common in Howrah.
Packaging and Weight per Batch
Consistent 90 kg batch sizing simplifies inventory control for wholesalers and plant engineers. Standard packaging methods help protect the plating during transit and storage, reducing the risk of surface damage before installation.
Typical Applications in Engineering and Fabrication
Structural Steel Assembly
Contractors use this bolt size to join beams and columns where moderate shear and tensile forces are expected. The hex head enables efficient tightening with standard spanners in site conditions across Howrah industrial projects.
Maintenance and Repair Work
Maintenance teams favor M39x120 fasteners for equipment stand repairs, panel replacements, and adjustable mountings. The bright zinc plated finish supports visual inspections for corrosion while simplifying handling during turnaround activities.
Storage, Handling, and Quality Practices
Storage Conditions and Corrosion Prevention
Store the bolts in a dry, ventilated area to preserve the zinc coating and limit exposure to salts and acids. Stacking should avoid direct contact with concrete or acidic surfaces that might accelerate localized corrosion.
Procurement and Quality Checks
Buyers in Howrah can request material test reports and verify plating thickness to ensure conformance with project specifications. Simple checks for thread integrity and head markings help maintain quality before fixtures are installed on site.
Practical Recommendations for Users in Howrah
- Verify thread pitch and head size on sample bolts before placing large orders.
- Inspect zinc plating visually for continuity and uniform brightness across the batch.
- Use calibrated spanners to achieve proper torque without damaging the hex corners.
- Implement regular inspection cycles for fastened joints in high-humidity zones.
- Maintain written procurement records including batch weight, supplier details, and usage logs.
FAQ
Reader questions
What is the standard thread pitch for M40 40 mm MS hex bolt M39x120 in Howrah?
The standard thread pitch is typically coarse, approximately 4.5 mm, compatible with common structural steel fastening practices in Howrah.
Can this bolt be used in outdoor structures exposed to high humidity in Howrah?
Yes, the bright zinc plated finish provides adequate short to medium term corrosion resistance for humid outdoor applications, provided maintenance checks are scheduled periodically.
Is the 90 kg batch size suitable for small scale workshops in Howrah?
Small workshops can use the 90 kg batch by storing bolts in sealed containers, reducing exposure to moisture, and tracking usage with inventory logs to avoid stockouts.
What are the compatible locking solutions to prevent loosening under vibration near Howrah railway yards?
Spring washers, lock nuts, or thread locking adhesives are commonly paired with this bolt in railway side workshops to maintain joint tightness under equipment vibration and dynamic loads.