45 steel

45 Steel Ground Round Bar

Ground round bar focused on dimensional control, straightness and surface finish for further machining and shaft production.

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45 Steel Ground Round Bar view 1 — Primary view

45 Steel Ground Round Bar view 2 — Angle view

45 Steel Ground Round Bar view 3 — Surface and end-face detail

SPECIFICATIONS

45 Steel Ground Round Bar: standard specification

Standard specification. Other sizes, tolerances and chrome layers are quoted against your drawing.

Grade	Grade 45 to GB/T 699-2015 · comparable, for reference only: C45, S45C, SAE 1045
Diameter	Ø4–140 mm from stock, up to Ø200 mm made to order
Tolerance	Ø4–11: −0.02/−0.05 mm · from Ø12: 0/−0.02, −0.01/−0.03 or −0.02/−0.05 mm
Hardness	≈ HRC17 (as supplied)
Surface roughness	Ra ≤ 0.8 μm
Straightness	≈ 0.1 mm/m from Ø25 · ≈ 0.2 mm/m below Ø25
Length & cutting	Standard 1 m; CNC saw cut to length (≈ 3 mm allowance), ends left as sawn
Certificates & testing	Steel mill certificate for each heat, forwarded unaltered; foreign grades named here are for reference only; third-party test reports on request

TYPICAL APPLICATIONS

Shaft-component stock; Machining bar stock; Mechanical structural parts.

SELECTION NOTE

If the final working surface requires hard chrome, confirm whether to select a chrome-plated product or reserve the part for downstream surface treatment.

PROCESS ROUTE

How this bar is made

Dashed steps are done by long-term partner plants to Yixin's specification; all others run in the Yixin workshop.

45 steel ground round bar

01Cold drawing (≤Ø28) / peeling (Ø30+)
02Roll straightening
03Centerless grinding
04Polishing

Yixin workshopLong-term partner plant, to Yixin's specificationAll products can be CNC-sawn to length

RELEVANT PROCESS CAPABILITY

Technical baselines relevant to this product route

010.02 mmtolerance band to drawing

Typical process capability. Final values for each size are fixed on the confirmed drawing, specification and order.

TECHNICAL GUIDES

Technical topics to review before ordering

01Shaft tolerance and fit: why “h6” or “high precision” is not enough 02Ra, straightness and cylindricity are different shaft requirements

SERVICE

Export terms

How standard orders are handled. Volume and special requirements are written into the quotation.

Minimum order: 1 t per order; 20–50 kg sample orders available
Lead time: Cut-to-length from stock 3–5 days · non-standard diameters 7–10 days · custom heat treatment 10–20 days, plus sea-freight booking
Trade & payment: FOB Shanghai or Ningbo · T/T
Packing: Protective film, steel-strapped bundles, wooden cases or pallets for sea freight
Documents: Commercial invoice, packing list and mill certificate; certificate of origin arranged per order; third-party inspection on request
Response: Quotation reply within one working day

Inquire about 45 Steel Ground Round Bar

Send diameter, length, quantity or a drawing. We reply with grade, tolerance, chrome thickness and lead time.

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