Jini Enterprise is a trusted OHNS steel supplier in Mumbai, offering premium-grade O1 / 1.2510 / SKS3 oil hardening non-shrinking steel to the precision tooling, gauge making, and intricate die manufacturing industries. OHNS (Oil Hardening Non-Shrinking Steel) is a tungsten-chromium alloyed cold work tool steel renowned for its excellent dimensional stability, superior toughness, and minimal distortion during heat treatment — making it the material of choice for complex, close-tolerance tooling applications.
As a dedicated tool steel distributor, we supply OHNS in various forms — round bars, flat bars, square bars, blocks, and precision-ground blanks — sourced from world-class mills with full traceability and mill test certificates. OHNS's unique composition provides a fine grain structure that resists distortion during oil quenching, allowing you to achieve tight tolerances without extensive post-heat-treatment grinding. It strikes an excellent balance between wear resistance, toughness, and machinability, making it ideal for tools with intricate profiles, sharp corners, or thin cross-sections.
🔹 Extremely Low Distortion
OHNS is specifically engineered for oil hardening with minimal size change. This unique property allows you to maintain critical dimensions and tight tolerances without expensive post-heat-treatment grinding operations.
🔹 Excellent Toughness
OHNS offers superior toughness compared to D2 and D3 grades. It withstands shock loads and resists chipping in demanding punch and die applications.
🔹 Superior Machinability
Supplied in the annealed condition, OHNS machines beautifully — ideal for creating complex profiles, sharp corners, and thin cross-sections.
🔹 Fine Grain Structure
The refined grain size of OHNS contributes to its excellent dimensional stability and consistent hardening response.
💡 Best used for: Intricate punches, blanking dies with complex shapes, precision gauges, master tools, and any tooling requiring close dimensional tolerances.
Heat to 740 – 780°C, cool slowly in furnace.
Achieves maximum Brinell hardness of ≤ 229 HB.
Heat to 600 – 650°C, hold for 2 hours, cool slowly.
Reduces machining stress for superior dimensional stability.
Austenitize at 780 – 820°C.
Quench in oil (recommended temperature: 200°C – 300°C bath).
Hardness after quenching: 60 – 64 HRC.
✔ Minimal distortion ensures tight tolerances are maintained.
Double tempering is recommended for maximum stability.
Typical working hardness: 56 – 60 HRC.
Temper at 150 – 250°C to achieve optimal properties.
⚠️ Important: OHNS has a narrow quenching window. Pre-heating and uniform temperature are crucial for achieving the best results with minimal distortion.
Oil hardening nature ensures minimal size change during heat treatment, allowing you to hold close tolerances without extensive post-treatment grinding.
Superior shock resistance and toughness compared to D2 and D3 grades, making it ideal for intricate tools that experience impact loads.
Excellent machinability in the annealed condition allows for complex profiles and fine details without excessive tool wear.
Fine, evenly distributed carbides provide adequate wear resistance for general tooling applications while maintaining toughness.
OHNS is the preferred grade for intricate, close-tolerance tooling applications:
📍 Based in Mumbai, Serving All of India: Sripati Castle Annex-1 C-103, 1st floor, Sripati Castle, Balwant Kolhatkar Marg, Mumbai – 400004. We serve precision tool rooms, gauge makers, and die shops across Mumbai, Maharashtra, and all major industrial hubs in India.
Partner with Jini Enterprise – your trusted OHNS steel supplier in Mumbai. We supply premium O1 / 1.2510 / SKS3 grade with low distortion, superior toughness, backed by full certifications, competitive pricing, and fast delivery. Get your custom quote today!
📧 Email: jinienterprise109@gmail.com
📞 Call Now: +91 865 591 6397