Laser-Perforated Stainless Steel Filter Tubes

Kaifil manufactures laser-perforated stainless steel tubes with round holes, straight or staggered rows and solid end bands. Applications include equipment screens, fluid distribution tubes and support cores for finer filter media.

Tube outside diameter D: D mm
Tube-wall thickness t: t mm
Round-hole diameter d: d mm
Hole layout: Straight or staggered rows

Share a drawing, reference sample or application requirements to discuss the configuration.

Open-ended metal tube with a uniform round-hole screen wall. — Open-ended tube01 / 05

Product images

Open-ended metal tube with a uniform round-hole screen wall.

Product details

Product forms

Dimensions

The tube drawing defines outside diameter D, wall thickness t and length separately from the round-hole field. For a square hole pattern, a 0.5 mm hole at 1.0 mm centre pitch gives 19.63% geometric open area within the patterned field. Solid end bands, weld lands and mounting zones are added to the tube layout separately. Hole diameter denotes the physical circular opening at the working face; the finer medium defines retention when the tube is a support core.

Several round-hole metal screen tubes showing open ends and solid joining zones.

Materials and connections

Choose 304, 316L, titanium or specified alloys, with seamless or welded tubes and open, closed, ringed or flanged ends. Tube length, active field, pitch and connection geometry are made to drawing.

Hole patterns and open area

Hole diameter defines the physical opening. For a square pattern, open area is πd²/(4p²), using hole diameter d and centre pitch p. Inspection covers openings, cut edges, tube dimensions and roundness.

Integration with the filter assembly

The laser-cut hole field and the uncut joining zones are defined separately on the tube drawing. The hole schedule states diameter, axial pitch, circumferential spacing and row offset. End bands provide solid material for welds, threads, flanges and seals. When the tube supports a fine mesh, the mesh performs retention and the perforations provide drainage and support. Inspection measures the cut opening at the working face, checks both inner and outer edges, and verifies the transition from the active field to the solid lands.

Assembly interface map

Component / interface	Defined function and inspection
Laser-cut round hole	Physical opening and cut-edge condition
Hole pattern	Axial pitch, circumferential spacing and row offset
Solid joining zone	Uncut width for end attachments and seals
Fine-media support	Contact surface and drainage behind the mesh
Finished tube	Diameter, wall, roundness and end-connection fit

Round-hole field: numerical open-area calculation

Parameter	Calculation value	Unit	Definition
Round-hole diameter d	0.5	mm	Input diameter at the working face.
Square-pattern centre pitch p	1.0	mm	Equal centre pitch in the two pattern directions.
Calculated field open area	19.63	%	100×πd²/(4p²); applies to the patterned field.

Ordering and production

Supply item	Order basis
Production lead time	2–3 weeks after order and drawing confirmation.
Trial orders	Small trial quantities for fit and process evaluation.
Regular production orders	50 pieces or US$3,000 per order.
Quotation basis	Material, finished dimensions, filter construction, connections and quantity.

Specifications

Laser-Perforated Stainless Steel Filter Tubes
Parameter	Specification	Notes
Tube outside diameter D	D mm	Outside diameter of the tube; defined separately from the hole field.
Tube-wall thickness t	t mm	Wall dimension normal to the tube surface; paired with the specified hole geometry.
Round-hole diameter d	d mm	Clear circular opening measured at the identified working face.
Hole layout	Straight or staggered rows	Specify centre pitch, row angle and required open area.
Solid end zones	To drawing	Reserve seating, welding and connection zones.
Materials and connections	304 / 316L / Ti · Special alloys	—
End configuration	Open / closed / ringed / flanged	—
Inspection scope	Finished dimensions, cut edges, roundness and interface inspection	—

Applications

Tubular strainer inserts

Round holes screen larger debris in a compact cylindrical seat; the tube can be removed for inspection when the housing design allows.

Supports for finer media

A perforated core backs wire mesh or sintered media while preserving a specified flow path and solid joining zones.

Flow and drainage sleeves

A zoned hole pattern can distribute or collect liquid along a tube when open area and pressure loss are evaluated for the assembly.

Selection guide

Include these details when discussing your requirements.

Choose the duty: For an exposed strainer, define particles and flow; for a support tube, define the finer medium and required backing area.
Match hole to wall: The tube drawing defines outside diameter D, wall thickness t and length separately from the round-hole field. For a square hole pattern, a 0.5 mm hole at 1.0 mm centre pitch gives 19.63% geometric open area within the patterned field. Solid end bands, weld lands and mounting zones are added to the tube layout separately. Hole diameter denotes the physical circular opening at the working face; the finer medium defines retention when the tube is a support core.
Set the active pattern: Give pitch, straight or staggered layout, clear-area target and unperforated end lengths.
Define the installation: Provide OD/ID, overall length, flow direction, connection and inspection requirements.

Frequently asked questions

How do pitch and hole layout affect flow area?

For round holes on a square pattern, open area is 78.54 × (hole diameter / pitch)² percent. A 0.5 mm hole on 1.0 mm pitch gives 19.63% within the patterned field; solid end bands and mounting areas reduce the open proportion of the complete tube.

Can different zones use different patterns?

Yes. Hole diameter, pitch and row arrangement can change along the tube, with uncut bands for welds, clamps and seals. Identify each zone and its length on the drawing.

Technical enquiry

Define the dimensions, media, joints and inspection records before confirming the order.