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info@mokshtubes.com

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High-Precision Capillary Tubes for Industrial Use

Capillary Tubes

Capillary Tubes

Capillary Tubes Capillary Tubes are precision-engineered tubing products with extremely small diameters designed for applications requiring high accuracy, controlled flow, and superior surface finish. These tubes are widely used in medical, instrumentation, refrigeration, and chemical industries where micro-level precision and reliability are essential.

Made from high-quality stainless steel, nickel alloys, titanium, and other specialty materials, capillary tubes offer excellent corrosion resistance, mechanical strength, and durability. Their tight dimensional tolerances and smooth internal surfaces make them indispensable for sensitive applications like chromatography, thermocouples, and hydraulic systems.

Moksh Tubes & Fittings LLP, we produce capillaries to ASTM, ASME, and international standards, ensuring consistency, quality, and performance. Our advanced manufacturing techniques, including cold drawing, bright annealing, and precision polishing, ensure capillary tubes meet the most demanding industry requirements.

Specifications

Category Details
Material Stainless Steel, Duplex & Super Duplex, Nickel Alloys, Inconel, Monel, Titanium, Copper Alloys
Grades Available in ASTM/ASME certified grades across all mentioned alloys
Outer Diameter (OD) 0.3 mm to 8 mm (custom options available)
Wall Thickness 0.05 mm to 1.0 mm (tolerances as per application needs)
Lengths Standard up to 6 meters or custom coil lengths supplied
Finishes Bright Annealed, Electro-Polished, Matte, Mechanical Polished
From Coiled, Straight Lengths, Cut-to-Length Precision Pieces
Standards ASTM A213, ASTM A269, ASTM B338, DIN, EN standards

Charts

Weight Chart

Nominal Bore Chart Outside Diameter (O.D)
(mm)		 Schedule 5C Schedule 10C Schedule 40C Schedule 80C Schedule 160C Schedule XXC
mm inches Wt Weight Wt Weight Wt Weight Wt Weight Wt Weight Wt Weight
3 1/8 10.3 0.2 0.01 0.3 0.02 0.4 0.03 0.6 0.04 0.8 0.06 1.0 0.07
6 1/4 13.7 0.2 0.02 0.3 0.03 0.4 0.04 0.6 0.06 0.8 0.08 1.0 0.10
10 3/8 17.1 0.2 0.03 0.3 0.04 0.4 0.06 0.6 0.08 0.8 0.11 1.0 0.14
15 1/2 21.3 0.2 0.04 0.3 0.06 0.4 0.08 0.6 0.12 0.8 0.16 1.0 0.20
20 3/4 26.7 0.2 0.06 0.3 0.09 0.4 0.12 0.6 0.17 0.8 0.22 1.0 0.28
25 1 33.4 0.2 0.08 0.3 0.12 0.4 0.17 0.6 0.25 0.8 0.33 1.0 0.41
32 11.4 42.2 0.2 0.13 0.3 0.19 0.4 0.26 0.6 0.38 0.8 0.50 1.0 0.62
40 1 1/2 48.3 0.2 0.16 0.3 0.24 0.4 0.32 0.6 0.48 0.8 0.63 1.0 0.78
50 2 60.3 0.2 0.24 0.3 0.36 0.4 0.47 0.6 0.70 0.8 0.93 1.0 1.17
65 2 1/2 73.00 0.2 0.33 0.3 0.49 0.4 0.65 0.6 0.97 0.8 1.29 1.0 1.63
80 3 88.9 0.2 0.47 0.3 0.70 0.4 0.93 0.6 1.40 0.8 1.87 1.0 2.36
100 4 114.3 0.2 0.77 0.3 1.14 0.4 1.52 0.6 2.27 0.8 3.04 1.0 3.82
125 5 141.3 0.2 1.17 0.3 1.72 0.4 2.30 0.6 3.42 0.8 4.58 1.0 5.76
150 6 168.3 0.2 1.63 0.3 2.41 0.4 3.23 0.6 4.79 0.8 6.38 1.0 8.02
200 8 219.1 0.2 2.73 0.3 4.03 0.4 5.40 0.6 8.01 0.8 10.65 1.0 13.33
250 10 273.1 0.2 4.17 0.3 6.15 0.4 8.23 0.6 12.23 0.8 16.27 1.0 20.35
300 12 323.9 0.2 31.25 4.57 36.00 9.52 73.88 12.7 132.0 33.32 238.76 25.40 186.97
300 12 323.9 0.2 5.94 0.3 8.76 0.4 11.71 0.6 17.45 0.8 23.23 1.0 29.05
350 14 355.6 0.2 7.21 0.3 10.63 0.4 14.23 0.6 21.20 0.8 28.26 1.0 35.35
400 16 406.4 0.2 9.29 0.3 13.70 0.4 18.35 0.6 27.37 0.8 36.46 1.0 45.59
450 18 457.2 0.2 11.52 0.3 17.00 0.4 22.78 0.6 34.00 0.8 45.33 1.0 56.70
500 20 508.0 0.2 13.88 0.3 20.50 0.4 27.50 0.6 41.10 0.8 54.75 1.0 68.45
600 24 609.6 0.2 18.93 0.3 28.00 0.4 37.50 0.6 56.05 0.8 74.68 1.0 93.95

Size Charts

Schedule 5C – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.30 0.05 0.00028
0.50 0.05 0.00045
0.80 0.08 0.00080
1.00 0.10 0.00140
1.50 0.12 0.00250
2.00 0.15 0.00370
2.50 0.20 0.00620
3.00 0.25 0.00970
3.50 0.30 0.01380
4.00 0.35 0.01890
5.00 0.40 0.02700
6.00 0.50 0.04150
8.00 0.50 0.05500

Schedule 10C – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.30 0.06 0.00033
0.50 0.08 0.00055
0.80 0.10 0.00095
1.00 0.12 0.00160
1.50 0.15 0.00290
2.00 0.20 0.00480
2.50 0.25 0.00750
3.00 0.30 0.01100
3.50 0.35 0.01520
4.00 0.40 0.02040
5.00 0.50 0.03120
6.00 0.60 0.04900
8.00 0.60 0.06280

Schedule 40C – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.50 0.10 0.00065
0.80 0.12 0.00110
1.00 0.15 0.00200
1.50 0.20 0.00390
2.00 0.25 0.00610
2.50 0.30 0.00950
3.00 0.35 0.01370
3.50 0.40 0.01880
4.00 0.45 0.02450
5.00 0.50 0.03340
6.00 0.60 0.05350
8.00 0.70 0.07900

Schedule 80C – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.50 0.12 0.00075
0.80 0.15 0.00130
1.00 0.20 0.00240
1.50 0.25 0.00460
2.00 0.30 0.00730
2.50 0.35 0.01120
3.00 0.40 0.01550
3.50 0.50 0.02150
4.00 0.60 0.03010
5.00 0.70 0.04260
6.00 0.80 0.06100
8.00 1.00 0.09000

Schedule 160C – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.80 0.20 0.00165
1.00 0.25 0.00280
1.50 0.30 0.00510
2.00 0.35 0.00820
2.50 0.40 0.01250
3.00 0.50 0.01900
3.50 0.60 0.02600
4.00 0.70 0.03650
5.00 0.80 0.05040
6.00 0.90 0.07180
8.00 1.20 0.12200

Schedule XXC – Size Chart (ASME B36.19)

OD (mm) Wall Thickness (mm) Weight (kg/m)
0.80 0.25 0.00210
1.00 0.30 0.00350
1.50 0.40 0.00670
2.00 0.50 0.01080
2.50 0.60 0.01650
3.00 0.70 0.02350
3.50 0.80 0.03200
4.00 1.00 0.04900
5.00 1.20 0.07200
6.00 1.50 0.11200
8.00 2.00 0.18000

Grades Available

Capillary Tubes are manufactured in a wide range of grades to suit specialized environments:

Material Grades
Stainless Steel Grades 304, 304L, 316, 316L, 321, 310 – for medical, food-grade, and precision applications.
Nickel Alloys Inconel 600, 625, 718 – for high-temperature & corrosive environments.
Monel Grades Monel 400, K500 – for marine and chemical use.
Titanium Grades Gr. 1, 2, 5 – for aerospace and medical devices.
Duplex & Super Duplex 2205, S32750 – for offshore and harsh industrial use.
Copper Alloys Cu-Ni 70/30, 90/10 – for refrigeration, marine, and heat-exchanger systems.
NICKLE ALLOYS
NICKLE ALLOYS
STAINLESS STEEL
STAINLESS STEEL
DUPLEX & SUPER
DUPLEX & SUPER
TITANIUM ALLOYS
TITANIUM ALLOYS
RARE TO ALLOYS
RARE TO ALLOYS
CARBON ALLOYS
CARBON ALLOYS

Applications

Capillary Tubes are critical for industries requiring precise control and miniature fluid handling, including:

Medical & Pharmaceutical
  • Hypodermic needles and surgical instruments
  • Catheters and fluid delivery systems
  • Laboratory equipment and chromatography
Instrumentation & Control
  • Pressure measuring devices
  • Hydraulic and pneumatic control lines
  • Thermocouples and sensor lines
Refrigeration & HVAC
  • Precision flow control in cooling systems
  • Expansion lines for refrigerators and AC units
Chemical & Petrochemical
  • Microfluidics and sampling lines
  • Chemical dosing and analytical instrumentation
Aerospace & Automotive
  • Lightweight fluid transmission systems
  • Fuel and brake line applications

Uses of Capillary Tubes

Capillary Tubes are used extensively across multiple industries, including:

Precision Fluid Flow Control

Provides highly accurate fluid flow control in sensitive systems

Miniaturized System Integration

Enables miniaturized solutions for medical, scientific, and industrial uses

Corrosion-Resistant Performance

Offers corrosion resistance in harsh chemical or marine environments

Compact Installation Flexibility

Allows tight bending radius for compact installations

Instrumentation & Safety Systems

Supports critical safety and measurement functions in instrumentation

Efficient Supply Chain Integration

Facilitates seamless import and logistics operations for global distribution

Advantages of Capillary Tubes

Superior Surface Finish

Smooth internal bore for optimal flow.

Wide Material Selection

Compatible with a variety of specialized alloys.

Corrosion Resistance

Ideal for aggressive chemicals and marine use.

Lightweight & Strong

Small diameter with exceptional strength-to-weight ratio.

Customizable Lengths & Forms

Available in straight lengths, coils, and cut pieces.

WHY CHOOSE US?

Specialized Expertise: Decades of experience in precision tubing manufacturing
Advanced Technology: Cold drawing & bright annealing for best tolerances
Wide Stock Range: Ready-to-ship standard sizes with custom options available
Global Supply: Serving medical, aerospace, and industrial clients worldwide
Stringent Quality Control: Compliance with ASTM, ASME, and ISO standards
Responsive Support – Dedicated technical assistance and customer service