Round bar
Hot-rolled and calibrated round bar. Carbon and alloy steels 20, 35, 45, 09G2S, 40X. Blank for machining.
Round bar is a blank for turning, milling and other machining: shaft, axle, rod, bushing, gear. 57 SKU in the catalogue across carbon and alloy steels.
Classification & types
Hot-rolled round bar (GOST 2590-2006)
Produced by rolling at high temperature. Surface with mill scale. Diameter tolerances — relaxed. Used as a blank for further machining.
Calibrated round bar (GOST 7417-75)
Made by cold-drawing HR round bar. Smooth surface, accurate dimensions. Used without further machining in simple shafts, axles, rods.
Range & standards
| Type | Diameter, mm | Length, m | Steel | GOST |
|---|---|---|---|---|
| HR round bar | 10—250 | 4—12 | 20, 35, 45, 09G2S, 40X | 2590-2006 |
| Calibrated round bar | 5—100 | 3—6 | 20, 35, 45 | 7417-75 |
Selection guide
- General-purpose shafts — steel 45, HR for machining
- Critical gearbox shafts — 40X after heat treatment
- Cold-resistant parts — 09G2S
- Simple rods and axles without machining — calibrated bar steel 20
Shipping documents
Factory certificate with steel grade, hardness, chemistry. For heat treatment — supply condition (normalised, annealed) must be stated.
Storage, acceptance, transport
Store horizontally on racks or in covered bundles. Calibrated bar — must be in lubricant (rust inhibitor coating or oil) for corrosion protection.
FAQ
Q. What does “round 50 st. 45” mean?
Round bar 50 mm diameter from carbon steel grade 45. A common blank for medium-load shafts.
Q. Can calibrated round bar be used without machining?
For simple tasks (bushing, dowel, axle without rotational load) — yes. For critical rotating nodes — heat treatment and finish machining are mandatory.
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Full catalogue 57+ SKU
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