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Selecting the right strut channel series is not just a dimensional choice. It determines what fittings you can use, what loads the system carries, and what thickness of steel the roll forming machine must handle. Specifying the wrong series costs money in overspecification or fails inspection when the channel does not match the project’s required standard.
Believe Industry Company has built the P series strut channel roll forming machine for every major Unistrut series over 15 years, supplying equipment to customers across 10+ countries. This guide defines each series from the original Unistrut specification and compares them on the dimensions that matter to buyers and machine specifiers.
The “P series” refers to the family of metal channel profiles originally defined by the Unistrut system. Each series designation — P1000, P1100, P3000, P3300, P4100, P5000 — describes a specific combination of profile size, material thickness, and hole pattern. All series are roll-formed from steel or stainless coil into a continuous channel that accepts standardized fittings for framing, support, and racking applications.
P1000 is the baseline of the series: a 1-5/8″ x 1-5/8″ (41 mm x 41 mm) square channel in 12-gauge (2.7 mm) steel. The other series modify this baseline in one of three ways:
P1000 itself covers a family of hole-pattern variants, all sharing the same 41 x 41 mm profile:
P1000 is the most widely produced strut channel profile in the world. A P series strut channel roll former built by Believe Industry typically runs 1.5–3.0 mm galvanized steel at 20–60 m/min, depending on the punching configuration. For lines that produce P1000 and compatible profiles, the pre-punching unit is the most critical subsystem: hole position accuracy determines whether standard fittings slide and lock correctly along the full channel length.
The fastest way to see the differences across all six series. Dimensions are given in both inches and millimeters.
| Series | Profile Size (in / mm) | Thickness (Gauge / mm) | Hole Pattern | Aplikasi Khas |
|---|---|---|---|---|
| P1000 | 1-5/8 x 1-5/8 (41 x 41) | 12 ga / 2.7 | Slotted or solid | General framing, solar racking |
| P1100 | 1-5/8 x 1-5/8 (41 x 41) | 14 ga / 1.9 | Solid only | Light-duty supports, cost-sensitive projects |
| P300 | 1-5/8 x 13/16 (41 x 21) | 12 ga / 2.7 | Slotted | Wall-mounted cable runs, shallow mounting |
| P3300 | 1-5/8 x 1-5/8 (41 x 41) | 12 ga / 2.7 | Round holes | Bolt-through connections, fixed positioning |
| P4100 | 2-1/2 x 1-5/8 (64 x 41) | 14 ga / 1.9 | Slotted | Wide-span supports, higher vertical load |
| P5000 | 1-5/8 x 1-5/8 (41 x 41) | 12 ga / 2.7 | Combo slot + round | Mixed fitting installations |
P1000 and P3300 share the same profile size and thickness but use different hole patterns. P300 is the only series in this comparison with a shallow (13/16″) depth, which changes how fittings attach and what bending loads the channel can carry.
For machines that produce slotted variations, punching die design determines slot length tolerance and edge finish. The tooling approach for slot-only patterns applies directly to the P1000T, P1000SL, and P300 series, and is covered in detail on the mesin pembentuk gulungan saluran penyangga berlubang halaman.
P1100 is the light-duty version of P1000. Both use the 41 x 41 mm profile, but P1100 is rolled from 14-gauge (1.9 mm) steel compared to P1000’s 12-gauge (2.7 mm).
That 0.8 mm thickness difference changes two things:
Load capacity. A P1000 channel carries roughly 40–50% more load than P1100 at the same span and mounting configuration. In most building codes for solar racking and seismic bracing, P1000 is the specified choice.
Machine sizing. A P series strut channel machine that runs P1000 at 2.7 mm needs a heavier frame, larger shaft diameter, and more drive torque than a machine that only runs P1100 at 1.9 mm. If a buyer needs both, Believe Industry builds the machine to the thicker material specification and adjusts roll gaps for the thinner material.
P1100 is the right choice when the project calls for a 41 x 41 mm profile but the loads are light — cable tray supports, light fixture mounting, and non-structural framing. Specifying P1100 in those cases saves material cost without compromising performance.
The P3000 series uses a 41 x 21 mm (1-5/8″ x 13/16″) profile — half the depth of P1000. This changes the channel’s structural behavior and its fitting system.
P300 is used where full-depth channel is too bulky or too expensive:
P3000 has the same 12-gauge thickness as P1000, so the material strength is identical. The difference is geometric: the shallow depth reduces the section modulus, which reduces bending capacity by approximately 50% compared to P1000.
From a roll forming perspective, P300 is simpler to form because the bend depth is shallower. A production line for P300 typically needs 14–16 forming stations, compared to 18–22 stations for full-depth P1000. The same quick-change principles discussed on the mesin pembentuk rol dua lapis page apply when configuring a single line for both profiles. When buyers need a P series strut channel roll forming machine that covers shallow and full-depth profiles on the same line, Believe Industry sizes the roll forming section and drive system to the largest profile, with modular tooling sets that swap between P3000 and P1000 roll sets.
P3300 uses the same 41 x 41 mm profile and 12-gauge thickness as P1000, but with round holes instead of slots.
This matters for two reasons:
Fitting compatibility. Slotted channels (P1000) accept all standard Unistrut fittings and allow position adjustment along the channel length. Round-hole channels (P3300) require fittings that bolt through a fixed hole and cannot be adjusted after installation.
Die complexity. A pre-punching unit for P1000 must hold tight tolerances on slot length and width because fitting adjustability depends on them. A punching die for P3300 is simpler because round holes have no orientation requirement.
In practice, P3300 is less common in new installations. Most specifiers default to P1000 or P1000T unless the project specifically calls for round-hole channel. The mesin pembentuk gulungan saluran uni strut can be configured for either hole pattern with a punching die change.
P4100 uses a 64 x 41 mm (2-1/2″ x 1-5/8″) profile — wider than P1000’s square section. The extra width increases the channel’s capacity for vertical loads and provides a larger surface for fitting attachment.
P4100 is used in:
P4100 is typically produced at 14-gauge (1.9 mm), which is thinner than P1000’s 12-gauge standard. The wider profile compensates for the thinner material in many applications, but load calculations must be checked for each case.
A roll forming machine for P4100 needs a wider roll forming section and a wider punching die compared to a P1000 machine. Believe Industry designs the machine width to match the strip width required by the profile — typically 180–220 mm for P4100 compared to 100–130 mm for P1000. Buyers who run both P4100 and P1000 on a single P series strut channel roll former get a machine sized for the wider strip, with interchangeable roll sets for each profile.
P5000 returns to the 41 x 41 mm profile and 12-gauge thickness of P1000, but adds a combination hole pattern: both slots and round holes in the same channel length.
This allows the channel to accept both standard slotted fittings and round-hole fittings. It is used in mixed-fitting installations where some connections need adjustability and others need fixed positioning.
The punching die for P5000 is the most complex in this comparison. It must punch two different hole shapes at the correct spacing along the strip. Believe Industry builds these dies with replaceable insert systems so individual punches can be changed without replacing the entire die set.
For solar racking, the hole pattern is typically defined by the racking designer and built into the punching die. Believe Industry configures the mesin pembentuk rol saluran penyangga surya with servo-driven punch positioning so the hole pattern can be adjusted through the PLC without changing the die, which is useful when supplying rails to multiple racking system brands.
All six series are available in the same material and coating options. The production machine must be specified for the material thickness range and yield strength required.
| Bahan | Rentang Ketebalan | Lapisan | Penggunaan Umum |
|---|---|---|---|
| Hot-dip galvanized (GI) | 1,5–3,0 mm | Z80–Z275 | Outdoor, general |
| Baja pra-galvanis | 1,5–2,5 mm | Z60–Z180 | Indoor, dry environment |
| 304 stainless steel | 1,5–2,5 mm | None (intrinsic) | Corrosive environment |
| 316 stainless steel | 1,5–2,5 mm | None (intrinsic) | Marine, chemical |
| Paduan aluminium | 1,5–3,0 mm | None (intrinsic) | Lightweight, corrosion-resistant |
Stainless steel and aluminum require different roll surface treatment compared to galvanized steel. Believe Industry specifies hard-chrome-plated rolls or PU-coated contact surfaces when the machine runs stainless or aluminum to prevent surface marking. A P series strut channel roll forming machine configured for stainless or aluminum production also uses a different lubrication system because these materials gall more easily under forming pressure. The same roll surface principle applies to the mesin panel atap logam when running color-coated steel.
The specification process is the same for all series. The differences are in the profile drawing, the hole pattern drawing, and the material thickness range.
Confirm these before requesting a quote:
Believe Industry reviews all ten parameters and returns a line layout drawing with total floor space, utility requirements, and a production output estimate. For a machine that produces multiple series, the proposal includes changeover time estimates for switching between profiles. Quick-change tooling design follows the same principles used on the mesin pembentuk rol dua lapis page, adapted for strut channel profiles.
Line speed and daily output depend on material thickness and punching configuration, not the series designation. Shallower profiles (P300) typically run at slightly higher speeds because forming load is lower.
| Series | Kedalaman Profil | Typical Line Speed | Pieces per 8-hr Shift (3 m length) |
|---|---|---|---|
| P1000 | 41 mm | 30–50 m/min | 4,800–7,200 pcs |
| P1100 | 41 mm | 40–60 m/menit | 5,760–8,640 pcs |
| P300 | 21 mm | 40–60 m/menit | 5,760–8,640 pcs |
| P3300 | 41 mm | 30–50 m/min | 4,800–7,200 pcs |
| P4100 | 41 mm | 30–50 m/min | 4,800–7,200 pcs |
| P5000 | 41 mm | 20–40 m/min | 3,200–5,760 pcs |
P5000 runs at the lower end of this range because the combination hole pattern requires more precise punching registration, which limits practical line speed. The mesin pembentuk gulungan rak tegak faces a similar speed limitation when the profile includes pre-punched features that must align across multiple roll stations.
The “P series” refers to the family of metal channel profiles originally defined by the Unistrut system. Each series designation — P1000, P1100, P300, P3300, P4100, P5000 — describes a specific combination of profile size, material thickness, and hole pattern. All series are roll-formed from steel or stainless coil into a continuous channel that accepts standardized fittings for framing, support, and racking applications.
Yes, if the machine is specified for the thicker material. P1000 at 2.7 mm needs a heavier machine than P1100 at 1.9 mm. If the machine is built for the P1000 thickness range, it can run P1100 material by adjusting the roll gaps. Running the machine only for P1100 allows a lighter frame and lower drive power, which reduces machine cost.
P1000 uses a 41 x 41 mm square profile. P3000 uses a 41 x 21 mm shallow profile. Both are typically 12-gauge thickness. P3000 has roughly half the bending capacity of P1000 because the depth is half as large. P3000 is used for wall-mounted applications and light-duty supports where full-depth P1000 is not needed.
P1000 is the most common choice for solar racking rails. The 41 x 41 mm profile and 12-gauge thickness meet structural requirements for most ground-mount and rooftop solar projects. Some racking designs use P5000 when the rail must accept both adjustable clamps and fixed brackets. The hole pattern for solar applications is typically specified by the racking system designer and built into the roll forming machine’s punching die.
The profile size is the same (41 x 41 mm), so the roll forming section does not need to change. The difference is in the punching die. If the machine uses a pre-punching unit with replaceable die inserts, the punching die can be changed to switch between P1000 slotted pattern and P5000 combination pattern. Without replaceable dies, the punching unit must be changed completely, which takes 4–8 hours.
A machine for a single series takes 45–60 days. A machine designed to produce multiple series with quick-change tooling takes 60–75 days because the roll sets, punching dies, and shaft systems are more complex. Believe Industry supplies interchangeability drawings before production starts so the buyer can confirm that all required profiles fit the same machine platform.
Believe Industry Company has manufactured roll forming equipment over 15 years. The engineering team has built machines for all major strut channel series — P1000, P1100, P300, P3300, P4100, and P5000 — for customers across 30+ countries.
Every machine is tested at full speed with the buyer’s profile and hole pattern before shipment. The test report includes sample channels measured for twist, straightness, hole position accuracy, and cut length tolerance. Operator training materials and spare parts lists ship with each machine.
For strut channel machines configured for solar applications, the punching die is the most specification-critical subsystem. Believe Industry designs and machines all punching dies in-house, which means the hole pattern matches the buyer’s drawing exactly without relying on third-party tooling suppliers.
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