MIR Series 30 Degree Solid Carbide Micro Internal Trapezoidal Threading Bars for Small Bore Machining

The MIR A30 Series is designed for precision turning of compatible metric trapezoidal internal threads. Typical applications include lead-screw nuts, actuators, positioning components, adjustment mechanisms and other parts that use Tr threads to transmit motion or load.

A30 identifies the 30° included-angle cutting profile used for compatible metric trapezoidal threads. It is not interchangeable with 29° ACME, 55° Whitworth-type or 60° metric and unified thread geometry.

The standard range includes TR pitches of 1.5, 2.0, 3.0, 4.0 and 5.0 mm. Pitch availability is tied to the specific model, cutting diameter, clearance length and shank size shown in the specification table.

Standard models cover cutting diameters from Ø5.6 to Ø11.9 mm, L1 clearance lengths from 20 to 50 mm, shank diameters of Ø6, Ø8, Ø10 and Ø12 mm, and overall lengths of 50, 60, 75 and 100 mm.

No. The d1 value is the tool cutting diameter shown in the drawing. Minimum bore suitability depends on the complete cutting-head envelope, thread major and minor diameters, pitch, thread depth, tolerance and retraction clearance. Provide the component drawing for confirmation.

MIR is the standard right-hand cutting configuration. For left-hand or special tool-path requirements, confirm the spindle direction, holder position and programmed cutting direction so that a suitable standard or custom geometry can be selected.

Confirm the complete Tr thread designation, nominal diameter, pitch, tolerance class, thread direction, thread length and bore geometry. Then select the matching pitch-specific model and verify d1, L1, shank diameter and retraction clearance against the component drawing.

Do not assume that one standard model can cut multiple pitches. The listed MIR A30 tools are pitch-specific. Select the model whose TR pitch matches the drawing, or request a custom tool when the required profile is outside the standard range.

Select an L1 length that reaches the entire threaded section without the larger tool body contacting the bore or shoulder. Use the shortest practical reach because the wider trapezoidal profile creates higher cutting load and is more sensitive to deflection.

Clamp the shank securely, minimize overhang, set the cutting edge accurately on center and control runout. Use a multi-pass threading cycle with a suitable infeed strategy instead of attempting to generate the full thread depth in one pass.

Direct coolant toward the cutting zone and make sure chips can leave the bore between passes. Chip packing is especially critical in blind holes because the broad thread profile removes more material and trapped chips can damage both the cutting edge and finished flanks.

Confirm pitch, thread hand, spindle rotation, tool orientation, final thread depth, thread length, relief position and retraction path. Simulate the full cycle and verify that the programmed pitch matches the selected TR tool model.

Yes. Thread pitch, cutting-head geometry, bore clearance, working length, shank diameter, carbide grade, coating and other dimensions can be customized according to a component drawing or reference sample.

Please provide the standard model or component drawing, complete Tr designation, nominal diameter, pitch, tolerance class, bore diameter, thread length, workpiece material, quantity and any coating, marking or packaging requirements.

Yes. Small trial orders and mixed standard models can be reviewed according to stock and production availability. The standard minimum order quantity is 10 pieces.

Yes. Custom laser marking, model identification, labels, individual protective tubes and private-label packaging are available for distributors and tooling resellers.

In-stock standard models can usually be dispatched within 1–3 working days after order confirmation. Customized tools require separate lead-time confirmation according to geometry, coating, quantity and packaging requirements.