CNC Machined Brass Multi-Port Manifold Block
Multi-port brass manifold blocks machined from C36000, with six H8 bores line bored to 0.03 mm, a 25 mm pitch held to ±0.03 mm, Ra 0.8 µm bore finish and sealing faces flat to 0.03 mm. Every block is pressure decay tested at 0.6 MPa before plating.
- Six Bores in Line to 0.03 mm
- Pitch Held to ±0.03 mm
- Cross Ports Deburred by Hand
- Leak Tested at 0.6 MPa
*Send the spool or shaft drawing that runs through the bores. A block with six separately bored holes will be 0.05 mm out of line by the last port, and a spool will bind at one end only.
Brass Multi-Port Manifold Block Overview
A brass manifold with a row of bores is really a line-boring job: each bore has to be on the same axis as the next, or a spool that fits the first port will seize in the sixth.
The block is squared, the sealing face is machined, then all six bores are cut in one line-boring pass from a single set-up, followed by the port threads, the cross drillings and a full deburr of every intersection.
C36000 Free-Cutting Brass
C36000 machines at three times the speed of aluminium and leaves a bore finish that seals without a bushing. It is the default for pneumatic and water manifolds up to 1 MPa.
CW617N or C37700 Forging Brass
CW617N is used when the block has to be brazed into a copper line, and C37700 when the block is hot forged first and only the bores and threads are machined.
Brass with more than 3 % lead machines best but is restricted in drinking water; for potable lines the block is made from DZR brass and the bore finish has to be Ra 0.4 µm to resist dezincification.
Brass Manifold Block Specifications
Line boring and milling data for brass manifolds, with the bore, pitch and leak values that decide whether the spool runs free.
| Specification | Machining Data | Specification | Machining Data |
|---|---|---|---|
| Product | Brass Multi-Port Manifold Block | Machining Process | 3-Axis CNC Milling, Line Boring, Tapping |
| Material | C36000 Free-Cutting Brass | Envelope | Up to 240 × 60 × 60 mm |
| Bore Diameter | Ø 10 – 30 mm, H8 | Bore Pitch | 25 mm, ±0.03 mm |
| Bore Alignment | Six Bores in Line Within 0.03 mm | Bore Finish | Ra 0.8 µm |
| Port Threads | G1/8 – G1/2, Class 6H | Wall Between Ports | 4 mm Minimum |
| Block Squareness | 0.05 mm per 100 mm | Sealing Face | Flat 0.03 mm |
| Cross Drilling | Ø 6 – 12 mm, Intersections Deburred | Port Count | 4 – 10 Ports |
| Customization | Cross Drilling, Plugs, Mounting Flange, Nickel Plating | Lead Time | 5 – 7 Days Sample, 12 – 16 Days Batch |
| Inspection | Bore Air Gauge, CMM Pitch, Pressure Decay, Thread Gauges | Packing | Port Caps, VCI Paper, Individually Boxed |
Key Features of Our Brass Manifolds
Bores line bored in one pass, intersections deburred, every block tested.
Six Bores Line Bored Together
All bores are cut on one axis in a single pass, which holds the line to 0.03 mm and lets a spool or shaft pass through without a tight port at either end.
Pitch Held From One Datum
The 25 mm pitch is set from a machined end face rather than the sawn block, so a replacement manifold lines up with the pipework without re-bending.
Cross Ports Deburred by Hand
Every intersection is reached with a back-spotting tool and then hand deburred, because a brass burr at a cross port will break off and jam a valve within weeks.
Pressure Decay on Every Block
Blocks are plugged, charged to 0.6 MPa and watched for 60 s. A weeping block is stripped, re-machined and re-tested rather than plated and shipped.
Manifold where a spool has to pass through?
Surface Finishes for Brass Manifolds
Brass tarnishes within days, the threads are a fit and the bores must stay clear of plating.
| Finish | Main Purpose | Finish | Main Purpose |
|---|---|---|---|
| Nickel Plating | Corrosion protection on brass in washdown | Clear Lacquer | Keeps the brass colour indoors |
| Masked Threads | Threads stay at gauge size after plating | Vapour Blasting | Satin finish before lacquer |
| Ultrasonic Clean | Removes polishing compound and swarf | Leak Test | Every Block, 0.6 MPa |
| Laser Marking | Port numbers on the top face | Plating Build | 5 – 8 µm, Threads Masked |
| Degrease | Before Plating | Port Caps | Fitted After Gauging |
| Passivation | Nickel Adhesion on Brass | Drying | Filtered Air, No Water Marks |
*Nickel plating adds 5 to 8 µm and will close a G1/8 thread and a H8 bore. Ports and bores are plugged, and the block is ultrasonically cleaned before plating so the nickel does not flake at a burr.
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Machining Process for Brass Manifolds
The six bores are line bored from one end after the block is squared, so a shaft or a spool passes through all of them without a tight spot.
01. Spool and Port Review
Check the spool diameter, the port layout and the pipe thread, then confirm that the wall between ports stays above 4 mm.
02. Square and Face the Block
Machine all faces square to 0.05 mm per 100 mm and face the sealing side as datum A for the bore line.
03. Line Bore the Ports
Bore all ports on one axis in a single line-boring pass, checking the line with a test bar before the block is unclamped.
04. Tap and Cross Drill
Tap the ports, drill the cross connections, then deburr every intersection by hand and flush the block with filtered air.
05. Test, Plate, Gauge
Pressure decay test at 0.6 MPa, ultrasonic clean, nickel plate with the ports plugged, then re-gauge every thread and bore.
Send the spool drawing and the port layout, and we will quote a brass manifold with the bores line bored on one axis.
Brass Manifold Block FAQs
0.03 mm over six ports at 25 mm pitch, bored in one pass without unclamping. Drilling and reaming each port separately gives about 0.08 mm, which is enough to bind a spool.
Brass holds a bore finish that seals without a sleeve, does not gall against a stainless spool and resists water better than anodized aluminium. The trade is weight and cost.
Yes, 5 to 8 µm of electroless or electroplated nickel, with the ports and bores plugged so the fits are unchanged. Nickel over a burr will flake, so the block is deburred first.
Every intersection is back-spotted through the port and hand finished. A brass burr left at a cross port is the most common cause of a valve sticking after a few hundred cycles.
0.6 MPa air for 60 s as standard, and 1.5 times working pressure hydrostatically on request. Blocks for potable water are also flushed and capped.
Yes, from a sample or a drawing. The pitch is taken from the end face rather than the port centres, because the end face is what locates the block in the pipe run.
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