What Is a Light Duty Tube Clamp?
A light duty tube clamp – also called a light series clamp or standard series clamp – is the most widely used type of pipe support clamp. It is the clamp engineers reach for first when routing hydraulic, lubrication, instrumentation and pneumatic lines that operate under everyday pressure and vibration.
The “light duty” name does not mean weak. It refers to the DIN 3015 Part 1 standard series, which defines a compact, economical clamp body sized for tubes up to 76.1 mm (2½″) outer diameter. The clamp grips the tube around its full circumference, holds it in a fixed position, and absorbs the pulsation and shock that travels through a pressurised line.
A light duty tube clamp is built from four parts: two clamping halves (jaws/shells) that close around the tube, a weld plate or mounting plate that anchors the assembly to the structure, a cover plate, and a single hex bolt that draws the assembly tight.
Tightening the bolt clamps the tube evenly, so it cannot rattle, fret or migrate along the run.
The result is a line that stays quiet, stays in place, and does not crack at its fittings – which is why light duty clamps are treated as a reliability component rather than a simple bracket.
Light Duty vs Heavy Duty: Which Clamp Do You Need?
The fastest way to specify the right clamp is to match the series to the working pressure and tube size. Light duty (DIN 3015 Part 1) and heavy duty (DIN 3015 Part 2) share the same DIN footprint and rails, so they mix on a single project.
Factor | Light Duty (Part 1) | Heavy Duty (Part 2) |
Tube OD range | 6 mm to 76.1 mm | 6 mm to 219 mm |
Pressure / shock | Low-to-medium pressure routing | High-pressure and high-shock systems |
Body profile | Compact, lightweight jaws | Thicker, reinforced jaws |
Bolt size | Smaller (typically M6–M10) | Larger for higher clamping force |
Best for | Instrumentation, lube, pneumatics, general hydraulics | Presses, heavy machinery, large-bore mains |
Cost & weight | Lower | Higher |
Choose light duty when you are routing small-to-mid diameter tubes under normal operating pressure – the majority of hydraulic and instrumentation lines fall here.
Step up to heavy duty only when the line carries high pressure, severe pulsation, or large-bore pipe. Selecting heavy series for an ordinary instrumentation line simply adds cost and weight with no benefit.
Bu-Lok Light Duty Tube Clamps at a Glance
Bu-Lok manufactures the complete DIN 3015 Part 1 light series, so a single supplier covers every position on your tube schedule.
Specification | Bu-Lok Light Duty Tube Clamp |
Standard | DIN 3015 Part 1 – light / standard series |
Tube OD range | 6 mm to 76.1 mm (1/4″ to 2½″) |
Clamp body | Polypropylene (PP), Polyamide (PA / nylon), Aluminium |
Cover & weld plate | Mild steel (zinc trivalent / A3C) or Stainless Steel 304 / 316 |
Hex bolt | Typically M6 to M10, in steel or stainless |
Body colours | PP – green, PA – black, Aluminium – silver |
Temperature range | Approx. −40 °C to +90 °C (PP); higher with PA / aluminium |
Mounting | Weld plate, bolt-on plate, or DIN mounting rail |
Equivalent to | STAUFF, Parker, Swagelok light series clamps |
Minimum order | 50 pieces; bulk and custom volumes supported |
Because every part is made to original DIN tolerances, Bu-Lok light duty clamps drop straight into existing layouts and rails without redesign.
Light Series Clamp Sizes
Light duty tube clamps are organised into clamp groups, where each group covers a band of tube diameters using a common body size. This lets one clamp group serve several nearby tube sizes, simplifying your bill of materials.
Bu-Lok stocks the full standard range of light series outer diameters, including:
6 · 8 · 10 · 12 · 15 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 32 · 35 · 38 · 42 · 48.3 · 50 · 60.3 · 63.5 · 70 · 76.1 mm
The smaller groups suit instrumentation and control tubing; the larger groups handle main hydraulic and lubrication lines up to 2½″. If your drawing calls for an imperial or non-standard OD, our engineering team can confirm the correct clamp group and supply it.
Sizing Tip: Always measure the tube’s outer diameter (OD), never the bore. A clamp matched to the exact OD grips evenly; an oversized clamp lets the tube vibrate and fret, which is the most common cause of premature clamp and fitting failure.
Body Materials for Light Duty Clamps
The body material decides how a light duty clamp performs against temperature, chemicals and fire. Bu-Lok offers three engineered options:
Polypropylene (PP) is the standard, highest-value choice. It resists a broad range of oils, fuels and chemicals, damps vibration well, and suits the vast majority of indoor and general industrial routing. Identified by its green colour.
Polyamide (PA / nylon) is the upgrade for higher temperature, greater impact strength and abrasive or mobile-equipment environments. Identified by its black colour.
Aluminium is specified where a non-combustible, electrically conductive or high-temperature clamp is mandatory – engine bays, offshore decks and fire-critical zones. Identified by its natural silver finish.
For the hardware, zinc-trivalent mild steel covers standard dry environments, while Stainless Steel 304 or 316 is essential for marine, offshore, washdown and chemical exposure where corrosion resistance cannot be compromised.
What Are The Applications of Light Duty Tube Clamps?
Light duty clamps are the workhorse of clean, organised, vibration-free tube routing. Bu-Lok light series clamps are used across:
- Hydraulic power units and machine tools – securing return, pilot and control lines on power packs and CNC equipment.
- Instrumentation and control panels – neat, repeatable routing of small-bore sensing and signal tubing.
- Pneumatic and lubrication systems – holding air and oil lines steady against constant low-level vibration.
- Mobile and construction equipment – controlling tube chatter on hydraulics, where PA bodies absorb impact.
- Process, chemical and dosing skids – corrosion-resistant clamping of small process tubes with stainless hardware.
- Automation, conveyors and packaging machinery – tidy cable, hose and tube management on frames and rails.
- Marine and offshore auxiliary lines – stainless and aluminum light clamps for salt-air and fire-safety duty.
How Light Duty Tube Clamps Are Installed?
Light series clamps are designed for fast, repeatable installation, which is part of why they dominate general routing:
- Fix the base. Weld or bolt the weld/mounting plate to the structure, or snap the clamp onto a pre-fitted DIN mounting rail for a weld-free build.
- Seat the tube. Place the tube into the lower clamp half, then fit the upper half over it.
- Add the cover plate and run the hex bolt through into the weld plate.
- Tighten to grip. Draw the bolt down until the halves close fully around the tube. The clamp now grips the full circumference.
- Space correctly. Repeat at the recommended interval along the run – closer spacing for smaller, higher-frequency lines – to prevent sag and resonance.
For multiple parallel lines, light series clamps stack vertically on a single rail using longer stacking bolts, keeping a panel or skid compact and serviceable.
Why Choose Bu-Lok for Light Duty Tube Clamps?
Bu-Lok delivers imported-grade light series clamp quality, manufactured in India, at a competitive price and short lead time.
- Complete light series in one place – every OD from 6 mm to 76.1 mm, in PP, PA and aluminium, with steel or stainless hardware.
- True import equivalents – dimensionally interchangeable with STAUFF, Parker and Swagelok light series, so no redesign is required.
- In-house manufacturing control – consistent DIN tolerances, material certificates and batch traceability.
- Stainless 304 / 316 capability – for marine, offshore and chemical work that most local suppliers cannot serve.
- Global export – supplying customers across the Middle East, Europe, Africa and Southeast Asia.
- Real engineering support – help with sizing, cross-referencing and custom configurations, not just order-taking.
When your project needs reliable, standard-compliant light duty clamps with the paperwork to match, Bu-Lok keeps you on schedule.