1045 / C45 / S45C / EN8 Cold Drawn Round Steel Bar
Short Answer
Junxiong Metal reviews and supplies buyer-specified 1045, C45, CK45, S45C, 1.0503 and EN8 / 080M40 round-bar enquiries for machining, shafts, pins, bushings, fittings and industrial components. These names are not treated as automatic equivalents. Buyers should send the exact grade standard, diameter, tolerance, delivery condition, length, quantity, surface requirement and destination country for factory review.
Common inquiry terms: 1045 cold drawn round bar, C45 bright drawn round bar, CK45 round steel bar, S45C cold finished round bar, 1.0503 bright steel bar, EN8 steel round bar, 080M40 bright bar and precision round bar for machining.
Quote information needed: grade, standard, diameter, tolerance, length, quantity, surface condition, packing requirement and destination port.
Send a complete 1045 / C45 / S45C / EN8 factory RFQ or send the grade, standard, diameter and quantity by WhatsApp.
Product Images for 1045 / C45 / S45C / EN8 Round Bar Buyers
Technical Facts for 1045 / C45 / S45C / EN8 Round Bar
1045 medium carbon steel round bar is often requested for machined shafts, pins, rollers, sleeves, mechanical parts and components that need better strength than low carbon steel. International buyers may also search for C45 or CK45 depending on their drawing standard and local market terminology.
Final grade confirmation should follow the buyer’s drawing, purchase standard, chemical composition requirement, mechanical property requirement and material certificate requirement. Similar grade names should not be treated as automatic substitutes without confirmation.
Buyers may also search for S45C or material number 1.0503 in different markets. UK buyers may write EN8 or 080M40. These names are useful for inquiry matching, but final substitution must be confirmed against the required standard, drawing, chemical composition, mechanical properties, heat-treatment condition and MTC.
Grade Designation and Purchase Standard Check
| Buyer Search Name | Common Market Context | Required Purchase Check |
|---|---|---|
| SAE / AISI 1045 | North American drawings and machining-stock inquiries | Governing standard, chemistry, delivery condition and MTC |
| C45 / CK45 / 1.0503 | European engineering-steel and bright-bar inquiries | Exact EN or customer standard, condition, dimensions and test requirements |
| JIS S45C | Japanese and Asia-Pacific drawings | Required JIS edition, chemistry, condition, tolerance and inspection documents |
| EN8 / 080M40 | UK legacy or current commercial engineering-steel enquiries | Exact stated designation and standard, chemistry, delivery condition, required properties and MTC |
Important: these designations are frequently compared in sourcing, but Junxiong does not treat SAE 1045, C45, CK45, 1.0503, S45C, EN8 or 080M40 as automatically interchangeable. Production and quotation follow the buyer’s stated standard, approved drawing and certificate requirements.
- Cold drawn or bright drawn surface for machining preparation
- Round bar supply by required diameter and tolerance
- Cut-to-length service can be reviewed by order
- Export packing for sea shipment
- MTC, heat number and inspection document requirements can be discussed before production
Standards and Grade-Route Verification
- SAE J403_202402: the current SAE source for carbon-steel chemical-composition designations used when the buyer specifies the 1045 route.
- ASTM A108-24: the active ASTM product specification for carbon and alloy cold-finished steel bars.
- BS EN 10277:2018: technical delivery conditions for bright steel products, relevant when the purchase route uses C45, 1.0503 or another EN designation.
- BS EN ISO 683-7:2024: the current BSI adoption for bright products of non-alloy and alloy steels. The buyer must still state the exact grade and supplied condition.
- PD 970:2005: the current BSI publication for UK wrought-steel purchase routes, including grades in regular UK use. It supports review when a buyer writes EN8 or 080M40 but does not make that route identical to 1045 or C45.
- JIS G 4051:2026: the current Japanese source for carbon steels for machine structural use. It can identify an S45C material route but does not by itself establish the final cold-drawn bar condition.
Grade-route boundary: 1045, C45, CK45, 1.0503, S45C, EN8 and 080M40 are cross-market sourcing candidates, not automatic equivalents. The RFQ and purchase order must identify the governing grade standard, cold-finished product standard and delivery condition, chemistry and mechanical limits, heat-treatment requirements, dimensions, tolerance, straightness and heat-specific MTC. These publisher links are reference sources, not Junxiong batch certificates.
Delivery Condition, Heat Treatment and Machining Allowance
A 1045, C45, CK45, 1.0503, S45C, EN8 or 080M40 inquiry should separate the incoming bar delivery condition from the final component condition. Cold drawing controls the supplied bar geometry and surface route; it does not by itself define the buyer’s later hardening, tempering, induction-hardening or other component process. The purchase order and drawing should state which requirements apply to the bar as delivered and which apply only after downstream machining or heat treatment.
| RFQ Field | What the Buyer Should State | Why It Changes the Review |
|---|---|---|
| Bar delivery condition | Required standard and agreed supply condition | Prevents the finished-part condition from being confused with the incoming bar condition |
| Diameter basis | Finished bar diameter, machining stock or pre-process blank size | Determines whether the quoted diameter is a final incoming size or includes removal allowance |
| Tolerance and straightness | Numeric limits, datum or measurement length and inspection method | Avoids using a generic tolerance label without an agreed acceptance rule |
| Downstream process | Turning, threading, grinding, heat treatment, coating or assembly route | Supports feasibility review and helps identify critical surface or allowance requirements |
| Batch evidence | MTC, heat number, dimensional report or other required inspection document | Defines what must be traceable for the quoted production batch |
When Should a Buyer Compare Cold Drawn, Peeled and Ground Bar?
Cold drawn bar can be suitable when the incoming blank needs controlled diameter, straightness and a bright surface before machining. If the application requires a different surface-removal route, tighter finished geometry or substantial stock removal, the buyer should describe the final operation rather than selecting a process name from habit. Review the cold drawn vs peeled and centerless-ground steel bar guide and the tolerance, straightness and cut-length RFQ guide before finalizing the inquiry.
Evidence boundary: representative round-bar and packing photographs show product form and handling capability. They do not prove a specific grade, heat treatment, heat number or mechanical-property result. Those items must be confirmed by the governing order documents and the applicable batch records.
Bright Drawn Round Bar vs Cold Drawn Round Bar
Many buyers use the terms bright drawn round bar, cold drawn round bar and cold finished round bar for similar purchasing needs. The exact wording depends on the market and the required surface condition. For quotation, the most important details are grade, diameter, tolerance, straightness, length and quantity.
| Buyer Search Term | Typical Intent | What To Confirm |
|---|---|---|
| 1045 cold drawn round bar | Medium carbon round bar for machining or shafts | 1045 standard, diameter, tolerance, length and MTC |
| C45 bright drawn round bar | European buyer searching by C45 / bright steel wording | EN/DIN requirement, diameter, tolerance and surface condition |
| CK45 round steel bar | Mechanical component or shaft material inquiry | Drawing standard, heat treatment requirement if any, quantity |
| EN8 / 080M40 round bar | UK engineering-steel buyer using legacy or local designation wording | Exact grade standard, supplied condition, diameter, tolerance, required properties and MTC |
| cold finished round bar | North American buyer searching bright/cold finished bar | Grade, diameter, tolerance, straightness and destination |
Applications for 1045 / C45 / S45C / EN8 Round Bar
Buyer-specified 1045, C45, CK45, S45C, EN8 or 080M40 round-bar routes are commonly reviewed by machining shops, component manufacturers, engineering steel distributors and OEM buyers. The drawing and governing standard control suitability for each application. Typical enquiries include:
- Shafts and pins
- Rollers and sleeves
- Machined mechanical parts
- Industrial fittings and bushings
- CNC turned components
- Stock programs for steel distributors and service centers
Buyer Checklist for 1045 / C45 / S45C / EN8 Round Bar
To quote accurately, please send the following information:
- Required designation and governing standard: 1045, C45, CK45, 1.0503, S45C, EN8, 080M40 or buyer’s own specification
- Diameter and tolerance
- Length or cut-to-length requirement
- Surface condition: cold drawn, bright drawn or other requirement
- Quantity and delivery batches
- Destination country and port
- Material certificate and inspection document requirement
- Application or drawing if available
Send the complete grade, standard and round-bar specification for factory review or send grade, diameter and quantity by WhatsApp.
FAQ for 1045 / C45 / S45C / EN8 Round Bar Buyers
Can Junxiong supply 1045 cold drawn round bar?
Yes. Junxiong can review 1045 cold drawn round bar requirements by diameter, tolerance, length, quantity and destination country.
Is 1045 the same as C45 or CK45?
These grade names are often searched together by buyers, but final substitution should not be assumed automatically. Please provide the required standard, drawing or previous material certificate for confirmation.
Can Junxiong review an S45C or 1.0503 inquiry?
Yes. Please send the exact governing standard, drawing, diameter, tolerance, delivery condition, quantity and MTC requirements. Junxiong will review the requested designation instead of assuming automatic equivalence with 1045 or C45.
Is EN8 or 080M40 the same as SAE 1045 or C45?
No automatic equivalence is assumed. EN8 is still used as a buyer search and legacy commercial term, while 080M40 may appear on UK specifications. The RFQ must state the intended designation and governing standard so chemistry, supplied condition, required properties and inspection documents can be checked before quotation.
Can bright drawn round bars be supplied cut to fixed length?
Cut-to-length service can be reviewed by order. Please provide length tolerance, quantity and packing requirement.
What documents can be prepared for export buyers?
Material certificate, heat number traceability, packing photos and inspection document requirements can be discussed before production.
What information is needed for a fast quotation?
Please send the governing grade standard, diameter, numeric tolerance, straightness requirement, length, quantity, destination country, port and application. A drawing helps identify machining allowance and downstream processing; a sample photograph can support initial discussion but cannot verify grade, dimensions or batch properties.