Product family 03 / Forged & machined shafts

Shafts quoted
from the drawing outward.

Forged shafts and machined shafts for heavy machinery, industrial equipment, transmission systems and custom engineering work. Geometry, material, heat treatment and inspection are read from the drawing and confirmed as one route.

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Technical data, process & buyer resources ↓

01Drawing / key dimensions

02Grade / mechanical needs

03Heat treatment

04Inspection requirement

Forged & machined shafts — Product viewRUNSU / reference

Product range

One drawing, one coordinated route.

Shaft work begins with geometry and acceptance criteria. Forging, machining, treatment and inspection are then arranged around what the finished part must do.

01Forged shaftsForged
02Machined shaftsMachined
03Heavy duty shaftsHeavy duty
04Transmission shaftsTransmission
05Gear shaftsGear
06Roller shaftsRoller
07Wind power shaftsWind
08Marine shaftsMarine
09Custom shafts to drawingCustom

A shaft specification, anchored to the drawing.

There is no responsible shaft quotation without geometry and acceptance criteria. This framework shows what the drawing review needs; no diameter, length or tolerance range is assumed.

Shaft inquiry framework. Diameter, length, tolerance and heat treatment are drawing- or inquiry-defined.
Shaft route	Original grade references	Drawing inputs	Coordination points
Forged shafts	45#, 40Cr, 42CrMo, 35CrMo	Diameter, length, forging allowance and heat treatment	Forging, rough machining and inspection
Machined shafts	45#, 40Cr, 42CrMo, 20CrMnTi, 38CrMoAl	Drawing dimensions, machining tolerance and surface requirement	Turning or milling support, Q&T and dimensional checks
Heavy duty shafts	34CrNiMo6, 36CrNiMo4, SNCM439, 4340 references	Drawing plus mechanical property requirement	Forging, machining and treatment route confirmed per part
Transmission / gear / roller shafts	Grade to be confirmed from the application and drawing	Geometry, fits, tolerance and heat treatment	Process sequence and inspection points agreed before work
Wind power / marine shafts	42CrMo, 34CrNiMo6 and other references as agreed	Technical specification and drawing	Material, treatment and inspection requirements confirmed case by case
Custom shafts	Grade or standard to be confirmed	Full drawing and key acceptance criteria	Route defined only after drawing review

No stock size range is implied by this page. Availability, tolerances and documentation are confirmed against the actual inquiry and agreed order.

Grade references

The source also names AISI 1045, 4130, 4140, 4340 and 8620; C45; EN8, EN19 and EN24. These references are discussed against the drawing, mechanical requirements and heat-treatment condition. They are not automatic substitutes.

TECHNICAL / BUYER REFERENCE

Technical data & buyer resources

Use these public technical references to define an order. They do not state RUNSU stock, batch test results or committed machining capacity. Grade and delivery-condition limits accompany the data.

Define the drawing, not a universal precision claim

Drawing and acceptance checklist
Parameter group	Provide	Define acceptance
Geometry	Overall and step lengths/diameters, fillets, bores and keyways	Datums and drawing revision
Fits	Bearing, seal and coupling journals	Tolerance designation or upper/lower limits
Geometry control	Roundness, cylindricity, straightness and runout	Datum, measurement location and method
Surface	Ra (µm) for functional surfaces, treatment and protection	Specify each critical surface
Material and treatment	Grade, specification, condition, hardness and properties	Separate surface/core targets and case depth where relevant
Blank and machining stock	Finished drawing and required delivery-stage drawing	Determine allowances through process review

Include the finished drawing and required delivery stage. As-forged, rough-machined and finished dimensions are different acceptance conditions.

Scot Forge · Quoting sizes ↗

Estimate mass from the stepped geometry

Worked geometry example · three solid cylindrical steps · not a customer case
Section	Diameter (mm)	Length (mm)
Left journal	80	150
Centre	100	300
Right journal	80	150

Adding the cylinder volumes at 7,850 kg/m³ gives approximately 30.33 kg net theoretical mass. Fillets, keyways, bores, machining stock and packaging are excluded. This is not a blank-purchasing weight or freight settlement figure.

SSAB · Steel density ↗

Typical shaft planning and hold points

01
Review the drawing
Agree finished geometry, material, delivery state, inspection scope and documentation.
02
Plan the blank
Evaluate bar or forging routes and subsequent machining stock for the geometry.
03
Sequence treatment and rough machining
Arrange operations around material and test requirements, with appropriate test stock and examination surfaces.
04
Examine and test
Use the agreed inspection stages and link records to heat and part identification.
05
Finish and release
Check final dimensions, geometry and surfaces before protection and packing.

A planning example, not a claim that every operation uses RUNSU-owned equipment. Processing and inspection arrangements are confirmed in the order.

Specify the acceptance level as well as the method

Different tests answer different questions
Method	Focus	Agree in the order
UT · ultrasound	Internal discontinuities	Code, quality level, scope, stage and acceptance criteria
MT · magnetic particle	Surface/near-surface discontinuities in suitable ferromagnetic material	Zones, procedure and acceptance
PT · liquid penetrant	Surface-opening discontinuities	Surface preparation, zones and acceptance
Hardness / tensile / impact	Treatment condition and mechanical performance	Sampling position/orientation, temperature, quantity and limits

ASTM A388/A388M provides a steel-forging UT procedure reference. The order must also state the ultrasonic quality level. Confirm required tests before quotation.

Scot Forge · Metallurgy & testing ↗ · ASTM · A388/A388M-26 ↗

References checked 19 October 2026. The agreed standard edition, drawing, technical agreement and material certificate govern supply and acceptance.

Processing coordination

Shaft processing, sequenced around the part.

The sequence matters. Forging, machining and heat treatment are coordinated so that each step leaves the geometry and condition the next step requires.

Cutting, surface and treatment requirements are confirmed against the product form.
Inspection points are named before work begins, not added after dispatch.
Any requirement outside the agreed scope is reviewed before it is accepted.

Forging

Forging support coordinated to material, size and technical requirement.

Rough machining

Material removal and preparation before further treatment or finishing.

Finish machining

Finish machining support against drawing dimensions and tolerance.

Turning & milling

Turning and milling support coordinated to the shaft features.

Heat treatment

Normalizing, quenching and tempering or other agreed treatment.

Final checks

Dimensional inspection and document checks before shipment.

Applications

Where shaft work is used.

Forged and machined shafts are coordinated for equipment where geometry, material and service conditions must align.

Review quality control scope

Heavy machinery
Construction machinery
Mining equipment
Transmission systems
Wind power equipment
Marine equipment
Rollers and gear systems
Custom industrial projects

Procurement FAQ

Shaft procurement questions

Clarify these points before quoting so the technical and commercial reviews start from the same information.

What drawing information is needed?

Provide the drawing with overall and section dimensions, critical tolerances, surface requirements, heat treatment and inspection points. Note any dimensions or notes that remain open.

Can you review a shaft before the grade is fixed?

Yes. The application, load conditions and drawing can frame the material discussion. The final grade and treatment condition still need written confirmation before quotation or production.

Is forging always required for a shaft?

No blanket answer applies. The route depends on the finished geometry, material, mechanical requirements and agreed technical specification. It is defined during the drawing review.

How is inspection agreed for machined shafts?

State the drawing dimensions, key characteristics and records required. Inspection points should be agreed before production so the machining and checking sequence supports them.

Send the drawing.
Define the shaft route.

Include the drawing, material grade, quantity, heat-treatment requirement, inspection points and destination. Note any dimensions or standards that still need clarification.

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Shafts quotedfrom the drawing outward.