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In B2B industrial procurement, precision is paramount. The China 5/16" .3125" Stainless Steel Hex Rod Bar Hexagonal 304 is designed with highly controlled tolerances and grain structure configurations to facilitate outstanding machinability, superior mechanical stress tolerance, and uniform mechanical values throughout the cross-section. Grade 304 (UNS S30400 / EN 1.4301) is the global standard for austenitic chromium-nickel alloys, striking the ideal balance between raw mechanical strength, wear resilience, and corrosion protection.
The hexagonal format of the .3125" bar is explicitly engineered for high-throughput CNC machining of components like fittings, valves, nuts, fasteners, and intricate industrial couplings. Precision drawing ensures sharp corners (with controlled radius tolerances) and flat faces that permit direct socket integration, bypassing the need for secondary milling or turning operations on raw stocks.
| Chemical Element | Composition Limits (Grade 304) | Mechanical Property | Value Target (ASTM A276 Cold Drawn) |
|---|---|---|---|
| Chromium (Cr) | 18.00% – 20.00% | Tensile Strength (UTS) | Min. 75,000 psi (515 MPa) |
| Nickel (Ni) | 8.00% – 10.50% | Yield Strength (0.2% Offset) | Min. 30,000 psi (205 MPa) |
| Manganese (Mn) | Max. 2.00% | Elongation in 2 inches | Min. 30% |
| Carbon (C) | Max. 0.08% | Hardness (Brinell) | Max. 201 HBW (HRB 92) |
| Silicon (Si) | Max. 0.75% | Dimensional Tolerance | h11 or h12 Class standard |
Note on Machinability: Standard AISI 304 exhibits a machinability rating of roughly 45% compared to B1112. With advanced post-drawing annealing profiles applied by modern manufacturers in China, the chip fragmentation and tool life during high-speed CNC turning are dramatically optimized.
The 5/16 inch (.3125") hexagonal bar format is an essential standard sizing for global manufacturers. It sits in a high-demand sweet spot for structural fasteners, fluid handling connectors, and specialized laboratory instruments. The global logistics and industrial supply chain depends on localized supply lines that can provide these precise dimensions with absolute quality assurance.
Ideal for automatic lathe feeds. Hexagonal bars do not slip in standard collets, permitting maximum torque transfer during rapid drilling, tapping, and external threading cycles. Ideal for large production runs of custom bolts.
Bolts and hex nuts formed from 5/16" 304 bar maintain high mechanical structural stability in harsh, mildly acidic environments, typical in pharmaceutical and food processing machinery settings.
Resistant to high chemical deterioration and oxidation. Hexagonal cross-sections simplify wrench assembly in highly restricted structural layout bays, providing key mechanical assembly advantages.
Ensuring dimensional consistency across miles of raw stock requires strict control over hot rolling, pickling, cold drawing, and final finishing operations. Our manufacturing plants implement state-of-the-art multi-stage draw benches that pull hot-rolled wire rod through precision tungsten carbide dies to form the exact .3125" hex profile.
This cold working not only gives the bar its bright finish and tight h11 tolerance, but also significantly increases its yield strength through work hardening. However, heavy cold drawing can induce residual internal stresses. To mitigate this and prevent distortion during downstream CNC slotting and machining, our bars undergo a stress-relieving annealing process. This controls grain orientation, resulting in an exceptionally stable bar stock that remains perfectly straight throughout your machining cycles.
To qualify as a leading supplier in highly regulated sectors like medical technology, oil & gas, and marine infrastructure, raw materials must satisfy stringent certification frameworks. In our Chinese mills, each production batch is accompanied by EN 10204 3.1 Mill Test Certificates (MTR), proving chemical composition verification and mechanical compliance. We ensure that our material remains 100% traceable, from the electric arc furnace (EAF) through refining to final dispatch packaging.
Governing the raw product requirements, mechanical characteristics, and dimensional tolerance configurations for hot-finished or cold-finished stainless steel bars.
Ensuring all materials are fully compliant with environmental protection and hazardous chemical regulations, vital for European and North American consumer goods.
Each hex bar undergoes optional non-destructive ultrasonic verification to confirm zero internal structural cracks or casting porosity defects.
The standard construction of elevator wire rope includes seale and warrington, in 8 or 9 strand construction, including filled wire. It is optimized for reducing bending stress, abrasion resistance and increased stability against radial pressures.
Comprehensive Industrial Synergy: Beyond hex bars, our state-of-the-art factories deliver specialized wire ropes and custom alloy solutions to support massive global infrastructure projects.
Shanghai Mei Shen Industrial Co., Ltd. was founded in 1999, is a research, production, service in one of the manufacturers.
Mainly committed to the field of steel wire rope manufacturing research and development, production, sales, service, to provide customers with the latest technology, the most valuable, the most reliable products. The production plant of steel wire rope is located in Jiangsu Province, with an annual output of stainless steel wire rope, various specifications of smooth steel wire rope, galvanized steel wire rope, plastic coated steel wire rope, compacts steel wire rope, special steel wire rope for rotary excavator, special steel wire rope for elevator, non-rotating series of Silu-Wallington-type steel wire rope, carbon spring steel wire, and other hardware rigging products. The products are widely used in construction machinery, bridge construction, ocean engineering, port lifting, coal mine, water conservancy engineering and other industries of lifting, binding and traction equipment. It is the largest and most complete steel wire rope production base in China.
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The standard construction of elevator wire rope includes seale and warinaton, in 8 or 9 strand construction, including filled wire. It is optimized for reducing bending stress, abrasion resistance and increased stability against radial pressures.
Oil drilling wire rope is a special purpose wire rope, with the continuous progress of wire rope design technology and the continuous development of drilling rig manufacturing technology.
There are single strand wire rope, 6 strand wire rope and multi-strand wire rope for Marine engineering, but the multi-strand wire rope is not used much.
It is widely used in a series of working mechanisms such as the lifting mechanism of various types of cranes, the amplitude changing mechanism of wheeled cranes.
Our products serve multiple complex, demanding engineering fields, ensuring long-term durability and safety in critical industrial systems globally.
Stainless steel wire rope has high temperature resistance, good fatigue resistance, excellent breaking tension, long service life, durability and many other characteristics, widely used in coal, petroleum, metallurgy, chemical industry, ships, Bridges, electric power, rubber, military, tourism, water conservancy, light industry and other industries. Products can be produced according to ISO, BS, DIN, JIS, ABS, LR and other international and foreign advanced standards.
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