SS304 (A2) Fastener Price in India 2026 — Bolt, Nut & Washer Rate Chart by Size

1. SS304 / A2 Fastener Overview

SS304 (also designated A2 under ISO 3506) is the most widely used stainless steel fastener grade in India and globally. It offers an excellent balance of corrosion resistance, mechanical strength, and cost-effectiveness for applications ranging from chemical processing equipment and pharmaceutical plants to architectural facades and food processing machinery. The “A2” designation comes from the ISO 3506 standard for corrosion-resistant stainless steel fasteners, where “A” denotes austenitic stainless steel and “2” identifies the 304 chemical composition. When suffixed with “-70” (A2-70), it indicates a minimum tensile strength of 700 MPa achieved through cold working, making it suitable for structural connections that demand reliable load-bearing capacity alongside corrosion protection.

2. SS304 Hex Bolt Price Chart — Per Piece (INR)

SS304 hex bolts (ISO 4014 partial thread / ISO 4017 full thread) are the highest-volume stainless steel fastener in Indian industrial procurement. The prices below cover standard A2-70 property class hex head bolts with metric coarse pitch threads. Bolt pricing depends primarily on diameter and length — larger diameters command disproportionately higher per-piece prices due to increased material volume, while per-kg rates actually decrease for larger diameters because the machining overhead per unit weight is lower. The most commonly procured lengths for each diameter are shown, covering the range from 30mm to 200mm which represents approximately 85% of all SS304 bolt orders in the Indian market.

The most frequently ordered SS304 bolt sizes in Indian industry are M8×40mm, M10×50mm, and M12×60mm, which together account for roughly 55% of total SS304 hex bolt unit volume. These sizes are used extensively in structural steel connections for chemical plant platforms, pharmaceutical equipment frames, food processing machinery mounting, and architectural stainless steel structures. A standard M10×50mm SS304 hex bolt at ₹43 per piece represents the single highest-volume SKU in the Indian SS fastener market, with annual consumption estimated in the tens of millions of pieces across all industrial sectors.

3. SS304 Hex Nut Price Chart — Per Piece (INR)

SS304 hex nuts (ISO 4032 Style 1 / ISO 4033 Style 2) must be paired with matching A2-70 bolts for complete material compatibility in stainless steel fastened joints. Using carbon steel nuts with SS304 bolts creates a galvanic cell at the thread interface that accelerates corrosion of the less noble carbon steel nut, leading to premature joint failure. The prices below cover standard A2-70 hex nuts in metric coarse pitch, which are the dominant specification for industrial procurement. Style 1 nuts (single height) are the standard choice; Style 2 nuts (taller, with increased thread engagement) are specified for high-vibration and high-temperature applications and carry a 10–15% premium over Style 1 equivalents.

Nut pricing follows a consistent pattern relative to bolt pricing: a standard hex nut typically costs 25–35% of the corresponding bolt price for the same diameter at a 50mm bolt length. For example, an M10 hex nut at ₹12 against an M10×50mm bolt at ₹43 represents a 28% ratio. This ratio is useful for quick budget estimation — when you know the bolt cost, simply add 30% for the nut to arrive at the bolt-nut pair cost. For complete joint assemblies requiring two washers per joint, the washer cost is typically an additional 15–20% on top of the bolt-nut pair price.

4. SS304 Washer Price Chart — Flat & Spring (INR)

Washers distribute the clamping load of bolted joints over a larger area, prevent surface damage to the clamped component, and in the case of spring washers (DIN 127), provide a locking action to resist vibration-induced loosening. SS304 flat washers (ISO 7089 normal series / ISO 7090 chamfered) are the standard choice for most industrial applications, while SS304 spring washers (split lock washers, DIN 127) are specified where loosening from dynamic loading or thermal cycling is a concern. For critical anti-loosening applications, disc spring washers (DIN 6796) or Nord-Lock wedge-locking washers should be considered, though they carry a significantly higher per-piece cost.

5. Complete Fastener Set Cost — Bolt + Nut + 2 Flat Washers

Budget estimation for fastener procurement is most practical when calculated per complete joint assembly rather than per individual component. The table below provides the total cost for a standard bolted joint consisting of one hex bolt, one hex nut, and two flat washers — one under the bolt head and one under the nut. This represents the most common joint configuration in structural and equipment mounting applications. The set cost simplifies bill-of-materials calculation for projects involving hundreds or thousands of bolted connections.

6. SS304 vs Carbon Steel Fastener Cost Comparison

The price premium of SS304 over carbon steel is the most frequently discussed factor in fastener procurement decisions. While carbon steel fasteners (Grade 8.8 or 10.9) are significantly cheaper, they require protective coatings (zinc plating, hot-dip galvanising, or dacromet) that add ₹5–15 per kg and still cannot match the inherent corrosion resistance of stainless steel. In corrosive environments, the lifecycle cost of carbon steel fasteners — including coating maintenance, premature replacement, and potential equipment damage from corrosion debris — often exceeds the initial SS304 premium within 3 to 5 years of service.

7. SS304 vs SS316 Fastener Cost Comparison

The decision between SS304 (A2) and SS316 (A4) fasteners is driven by the corrosion environment rather than cost, as the price differential is moderate at 35–45%. SS316 contains 10–12% nickel (vs 8% in SS304) plus 2–3% molybdenum, which provides dramatically better resistance to pitting corrosion in chloride-containing environments. For coastal installations, offshore platforms, desalination plants, and chemical process piping handling chlorides, acids, or sulphides, SS316 fasteners are the correct engineering choice despite the higher unit cost.

8. Bulk Discount Tiers for Project Orders

Indian SS304 fastener suppliers and stockists operate on volume-based pricing tiers that reward higher order quantities with progressively lower per-unit rates. Fastener procurement for EPC projects, OEM production lines, and annual maintenance contracts can achieve significant savings through consolidated ordering. The discount tiers below reflect typical market ranges observed across major Indian fastener sourcing hubs including Ahmedabad, Mumbai, Chennai, and Ludhiana. Mixed-diameter and mixed-type orders (bolts + nuts + washers combined) often qualify for higher effective discount tiers because the total piece count determines the tier, not the count per individual size.

9. Raw Material Cost Drivers in 2026

The cost structure of SS304 fasteners is dominated by raw material, which accounts for approximately 50–60% of the finished product price. Unlike carbon steel fasteners where machining labour is a larger proportion, the SS304 raw material cost alone (₹180–220/kg for SS304 rod) exceeds the finished price of equivalent carbon steel fasteners (₹65–90/kg). This makes SS304 fastener pricing highly sensitive to nickel market movements, as nickel constitutes approximately 8% of the SS304 alloy composition and is the single most expensive individual element in the stainless steel formula.

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