📦 Raw Material Quick Facts
- ✅ Primary raw material: MS (mild steel) rods / wire rods
- ✅ Main sourcing hubs: Ludhiana, Mandi Gobindgarh, SAIL distributors
- ✅ Material yield: Approximately 85–90% (10–15% loss in heading and trimming)
- ✅ Typical raw material cost: 55–60% of total revenue
- ✅ Order frequency: Weekly or fortnightly for most small plants
Raw material is the largest single cost in your nut bolt plant — typically 55 to 60% of your total revenue. Getting your procurement right means better margins, fewer production stoppages and consistent product quality.
What Raw Material Do You Need?
The primary raw material for bolt and nut manufacturing is MS (Mild Steel) wire rod — specifically low carbon steel rod in coil form. The rod is drawn through a wire drawing machine to the exact diameter needed for each bolt size before being fed into the cold heading machine.
Steel Grades for Different Bolt Types
| Bolt Grade | Steel Grade | Carbon Content | Application |
|---|---|---|---|
| Grade 4.6 / 4.8 | SAE 1008 / IS 10748 | Low carbon (<0.10%) | General construction, non-structural |
| Grade 6.8 | SAE 1018 / IS 10748 | Low-medium carbon | General engineering, structural |
| Grade 8.8 | SAE 1038 / SCM 435 | Medium carbon, alloy | Automotive, heavy machinery |
| Grade 10.9 / 12.9 | SCM 440 / B7 | Alloy steel | High-load automotive, aerospace |
Wire Rod Diameter Chart
Each bolt size requires a specific wire rod diameter as input to the cold heading machine. Here is the standard relationship:
| Bolt Size | Wire Rod Diameter | Common Applications |
|---|---|---|
| M6 | 6.5 – 7 mm | Electronics, small assemblies |
| M8 | 8.5 – 9 mm | Furniture, light machinery |
| M10 | 10.5 – 11 mm | Construction, automotive |
| M12 | 12.5 – 13 mm | Structural, heavy machinery |
| M16 | 17 – 18 mm | Infrastructure, bridges |
| M20 | 21 – 22 mm | Heavy construction, industrial |
Where to Buy Raw Material in India
1. Mandi Gobindgarh, Punjab — Steel City of India
Mandi Gobindgarh is India's largest secondary steel market, located approximately 50 km from Ludhiana. Hundreds of steel rolling mills and stockists operate here. If you are based in Punjab or nearby states, buying from Mandi Gobindgarh gives you the best combination of price and availability. You can buy in smaller quantities (1–5 tonnes) compared to direct mill purchase.
2. SAIL and RINL Authorised Distributors
Steel Authority of India (SAIL) and Rashtriya Ispat Nigam (RINL/Vizag Steel) have authorised distributors across India. Their wire rod is of consistent quality and certified to BIS standards — important if you are supplying to railways, defence or government construction projects. Prices are slightly higher than secondary market but quality is guaranteed.
3. Local Steel Stockists
Every industrial town has local steel stockists. For a small plant buying 5–20 tonnes per month, local stockists are most convenient — they offer credit terms, smaller minimum orders and same-day delivery. Build a relationship with 2–3 stockists so you always have a backup supply source.
4. Direct from Rolling Mills
Once your plant grows to 50+ tonnes per month consumption, buying directly from wire rod rolling mills gives you the lowest price. However, minimum order quantities are typically 20–50 tonnes per order, requiring larger working capital and storage space.
How to Estimate Monthly Raw Material Requirement
Use this simple formula to plan your monthly procurement:
Monthly MS Rod Requirement Formula
Step 1: Target daily output (kg of finished bolts) × 25 working days = Monthly output (kg)
Step 2: Monthly output ÷ 0.87 = Raw material required (accounting for ~13% process loss)
Example: Target 500 kg/day × 25 days = 12,500 kg finished bolts ÷ 0.87 = ~14,400 kg raw material per month
Other Raw Materials and Consumables
- Hydrochloric acid / Sulphuric acid — For pickling and cleaning rods in the wire drawing process. Buy from local chemical suppliers.
- Drawing compound / lubricant — Applied to wire before drawing to reduce friction and die wear.
- Cutting oil / Thread rolling compound — Lubricant for the thread rolling machine. Essential for die life and thread quality.
- Dies and taps — Wear items that need regular replacement. Stock at least 2 sets per size.
- Packaging material — Polypropylene bags, corrugated boxes, labels.
Pricing and Market Fluctuations
MS wire rod prices fluctuate monthly based on global steel markets, iron ore prices, and domestic demand. In 2024–25, MS wire rod was trading at approximately ₹48,000–58,000 per tonne at Mandi Gobindgarh. Always get quotes from at least 2–3 suppliers before purchasing.
Build a buffer stock of 15–20 days of raw material to protect against sudden price spikes or supply disruptions.
🏭 Machine Compatibility with Raw Material
Your machine specifications must match your raw material diameter range. When you purchase from Samrat Machine Tools, we confirm the wire diameter range your machines can handle and advise on the correct raw material specifications for your product range.