Cold Drawn Hexagonal Steel
Precision bright hex bar in S5–S100 mm — six accurate faces, free-cutting grades for high-speed automatic machining.
Cold drawn hexagonal steel is produced by drawing hot rolled hex bar through precision dies at room temperature, giving six accurately formed faces, a bright oxide-free surface and tight across-flats tolerance. The hexagonal cross-section provides superior torque transmission and anti-slip characteristics, making it a preferred material for bolts, nuts, fasteners and machine tool components.
Suzhou Zhenfu Cold-Drawn Steel Co., Ltd. produces cold drawn hexagonal steel from S5 mm to S100 mm (across flats), with a strong focus on free-cutting grades such as 12L14 and Y40Mn for high-speed automatic machining and Swiss-type lathes. Our source-controlled feedstock from leading steel mills ensures consistent machinability, low surface defects and stable hardness between batches, backed by over 18 years of manufacturing experience.
Size Range at a Glance
| Across-flats size | S5 mm – S100 mm (custom intermediate sizes available) |
|---|---|
| Length | Cut to length as specified; standard 6 m, custom lengths available |
| Tolerance | Per GB/T 905 / EN 10277 / ASTM A108 — full tolerance tables and technical data on the product detail page |
| Face quality | Six accurate faces, consistent cross-section |
| Surface | Bright, smooth, oxide-free |
| Packaging | Five-layer rust-proof export packaging (oil, kraft paper, film, strapping, fumigated pallet) |
Available Grades
Common grades include 12L14, Y40Mn, 45#, Q235 and 40Cr, supplied to GB standards with comparable JIS, EN and ASTM equivalents. For high-speed automatic lathe production, choose free-cutting 12L14 or Y40Mn; for higher-strength fasteners, 40Cr or 45#.
Full grade comparison tables (GB ↔ JIS ↔ EN ↔ ASTM) are available on the product detail page.
Applications
Cold drawn hexagonal steel is widely used for bolts, nuts, screws, rivets and standard fasteners, as well as machine tool components, spindles, shafts, tools and precision hardware. Typical end-use industries include:
Standard fasteners — hex bolts, nuts, screws and rivets requiring precise across-flats dimensions
Machine tools — spindles, shafts and components where torque transmission matters
Automotive parts — precision hardware and small components for vehicle systems
General hardware — tools, fixtures and turned parts in free-cutting grades
Why Choose Cold Drawn Hexagonal Steel
Free-cutting grades (12L14, Y40Mn) reduce cycle time and tool wear on automatic lathes
Six accurate faces give reliable spanner/wrench engagement and consistent dimensions
Bright, oxide-free surface — no descaling before machining
Consistent hardness (±5 HB) supports stable, repeatable production
Cold Drawn Hexagonal Steel FAQ
Which hex steel grade is best for high-speed machining?
12L14 is the most widely used free-cutting grade for automatic lathes and Swiss-type machines, offering excellent machinability and surface finish. Y40Mn provides similar machinability with higher strength. Our engineers can recommend the right grade for your parts.
What size range do you produce?
From S5 mm to S100 mm across flats, with custom intermediate sizes and cut lengths available.
Why choose cold drawn hex over hot rolled hex?
Cold drawing gives tighter across-flats tolerance, sharper corners, a brighter surface and better straightness, which reduces machining and improves spanner engagement in fastener applications.
Is the surface suitable for direct use in automatic lathes?
Yes. The bright, oxide-free surface and consistent hardness reduce tool wear and support stable cutting in automatic and Swiss-type lathes, batch after batch.
Can you supply hex steel with material certificates?
Yes, bilingual MTCs with chemical composition and mechanical properties are provided with every batch, and third-party inspection by SGS or BV can be arranged.
Related:Cold Drawn Round Steel Cold Drawn Square Steel Hex Steel for Machine ToolsHex Steel Product Detail
Send your across-flats size, grade, length and quantity — we will confirm price and delivery within 24 hours.
