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Tool steel plate grade

O1 Precision Tool Steel Plates

O1 precision plates and flat rectangular blanks are quoted to custom finished dimensions and a stated material condition. Buyers using the term ground flat stock or gauge plate should specify the required faces, dimensional acceptance and delivery condition. A catalog reference describes the machining scope rather than a standard stocked bar size.

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Long finished steel plates with machined faces, external product-form reference
External processed-plate referenceSource: Moldtoolsteel

External reference photograph illustrating product form; not a Lichengda delivery.

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Grinding and Milling Options

Each catalog reference carries its selected scope into the quotation form. Finished dimensions, material records and acceptance follow the approved order.

O1 Two-Side Ground + Four-Side Milled Plates — model schematic
Model schematic · illustrative geometry
LCD-PL-O1-G2

Two-side ground + four-side milled

Precision grinding on two reference faces, with the four remaining faces milled. Thickness and length/width have separate tolerances.

Length / width
±0.10 mm
Thickness
±0.05 mm
Parallelism
0.04 mm / 100 mm between the ground reference faces
Material condition
Confirm the material condition for the order
Size scope
Maximum processing: 1200×800×400 mm; process review required

Material sourcing, delivery condition and any hardness requirement are confirmed in the quotation. Finished dimensions, reference faces, inspection and machining allowance follow the approved drawing. This grade is outside the published E1 scope.

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O1 Six-Side Precision Milled Plates — model schematic
Model schematic · illustrative geometry
LCD-PL-O1-M6

Six-side precision milled

All six faces precision milled to the agreed finished dimensions. Use the drawing to identify any additional grinding requirements.

Length / width
±0.10 mm
Thickness
±0.10 mm
Parallelism
0.08 mm / 100 mm
Material condition
Confirm the material condition for the order
Size scope
Maximum processing: 1200×800×400 mm; process review required

Material sourcing, delivery condition and any hardness requirement are confirmed in the quotation. Finished dimensions, reference faces, inspection and machining allowance follow the approved drawing. This grade is outside the published E1 scope.

Full finishing specification →Request this option
Grade and condition limits

O1 is outside the published E1 grade list. The listed G2 and M6 options retain their own tolerances. Send a different grinding scope or tighter requirement for separate technical review.

Grade designations are listed separately; no automatic equivalence or substitution is assumed. Per-100-mm parallelism does not define whole-plate flatness or surface roughness.

Drawing and Quotation Checklist

  • Provide finished metric dimensions, required material condition and whether the order is a custom plate or rectangular flat blank.
  • Mark finished length, width and thickness, reference faces, tolerances, datums and any whole-plate geometric requirements.
  • Specify quantity, required material/hardness/dimensional records, any requested UT scope and delivery destination.

Include quantity, drawing revision, required inspection documents and delivery destination. Single-piece and small-batch inquiries are accepted.

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Inspection and Production Planning

MTC material documentation, hardness and dimensional inspection reports can be requested. UT reports are available on request with an agreed scope. Regular plate sizes range from 100×100×20 to 800×600×300 mm; maximum processing size is 1200×800×400 mm, subject to grade, condition and finish review. This maximum does not carry the E1 tolerance.

Production schedule: 3–7 working days. Working days exclude weekends and statutory public holidays in China. The clock starts on the next working day after formal PO receipt, final drawing/specification approval and applicable deposit receipt are all completed. Transport time is separate.

Inspection and documentation →Compare plate finishing routes →View product photographs →

O1 Tool Steel Plate Questions

Which finishing options are listed for O1 precision plates?

Two-side grinding with four-side milling uses ±0.05 mm for thickness and ±0.10 mm for length/width, with parallelism of 0.04 mm per 100 mm between the ground faces. Six-side milling uses ±0.10 mm in all three dimensions and parallelism of 0.08 mm per 100 mm. Size, condition and drawing review still apply.

Can O1 be ordered with E1 six-side grinding at ±0.02 mm?

O1 is outside the published E1 grade/condition list. A different grinding or tolerance request can be submitted for separate technical review; the standard E1 tolerance is not automatically assigned.

Which delivery condition should be specified for O1 plates?

State the required condition and any hardness acceptance requirement on the drawing or inquiry. Material sourcing, processing route and the actual supplied condition are confirmed in the quotation; no generic hardness range is assumed.

Is an O1 ground flat stock inquiry the same as a ready-stock gauge plate order?

Not automatically. This service is quoted to agreed plate dimensions, material condition and finishing faces. Send the required size and quantity; no standard stock size or immediate dispatch is implied.

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