HIGH PULSE CONSTANT PRESSURE HYDRAULIC HOSE 642 SERIES
OIL & FUEL · 420 bar working / 1680 bar burst
↓Certifications & factory photos
- Hose Construction
- Structure:The hose consists of an inner tube, a steel wire braided or spiral reinforcement layer, and an outer cover
- Working Temperature:-40℃ to +120℃; for water medium: 0℃ to +70℃
- Hose Features
- Bend Radius:Minimum bend radius runs 50–630 mm over the range.
- Size Coverage:10 published codes spanning 6.4 mm to 50.8 mm bore, from 642-6 upward.
- Application:Suitable for conveying hydraulic fluids such as glycol, hydraulic oil, lubricating oil, emulsions, etc.
- Outer Diameter:Outer diameter 13.2–71 mm across the published bores.
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PRODUCT INTRODUCTION
642 Series — 420 bar From the 3/8 Inch Up
The 642 series is the top rung: 42 MPa (420 bar) at every bore from 6.4 to 50.8 mm, with 168 MPa burst. It is the class specified when a circuit genuinely runs in the 400 bar range and cannot be re-rated.
Its cost profile is the opposite of the 635 rung. Only the two smallest sizes keep the slim body — 13.2 and 14.7 mm outside diameter at 50 and 55 mm arc, identical to 628. From the 9.5 mm bore the wall appears: outside diameter goes to 20.9 mm and the minimum arc to 150 mm, against 16.8 mm and 65 mm on 628.
At the top of the range the three series converge again: at 25.4, 38.1 and 50.8 mm all three measure 37.8, 57.5 and 71.0 mm outside with 400, 560 and 630 mm arcs. Above an inch, the pressure class costs nothing in envelope.
Data Display
| PRODUCT TYPE (Part Number) | AVAILABLE TYPES | AVAILABLE TYPES | AVAILABLE TYPES | AVAILABLE TYPES | INNER DIAMETER（ID） mm | INNER DIAMETER mm | HOSE OUTER DIAMETER mm | MAXIMUM WORKING PRESSURE W.P | psi | MINIMUM BURST PRESSURE B.P | psi | MINIMUM BEND RADIUS Min.B.R |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 642-6 | AC | BC | CC | DC | 6.4 | 11.3 | 13.2 | 42 | 6,092 | 168 | 24,366 | 50 |
| 642-8 | AC | BC | CC | DC | 7.9 | 12.7 | 14.7 | 42 | 6,092 | 168 | 24,366 | 55 |
| 642-10 | CC | DC | 9.5 | 17.8 | 20.9 | 42 | 6,092 | 168 | 24,366 | 150 | ||
| 642-13 | CC | DC | 12.7 | 20.6 | 22.6 | 42 | 6,092 | 168 | 24,366 | 180 | ||
| 642-16 | CC | DC | 15.9 | 24.2 | 27.7 | 42 | 6,092 | 168 | 24,366 | 220 | ||
| 642-19 | CC | DC | 19 | 28.3 | 29.6 | 42 | 6,092 | 168 | 24,366 | 280 | ||
| 642-25 | CC | DC | 25.4 | 35.5 | 37.8 | 42 | 6,092 | 168 | 24,366 | 400 | ||
| 642-32 | CC | DC | 31.8 | 47.6 | 50 | 42 | 6,092 | 168 | 24,366 | 480 | ||
| 642-38 | CC | DC | 38.1 | 54.4 | 57.5 | 42 | 6,092 | 168 | 24,366 | 560 | ||
| 642-51 | CC | DC | 50.8 | 67.8 | 71 | 42 | 6,092 | 168 | 24,366 | 630 |
Values are reproduced from the official YIBO product page. psi columns = MPa × 145.038, rounded. 10 codes from 6.4 mm to 50.8 mm bore — the top rating is not the whole story; the order data sheet governs the batch.
Application & Selection
Suitable for conveying hydraulic fluids such as glycol, hydraulic oil, lubricating oil, emulsions, etc. HIGH PULSE CONSTANT PRESSURE HYDRAULIC HOSE 642 SERIES covers 6.4–67.8 mm across 10 published codes.
Crimped and tested to the 420 bar working figure, across the 10 codes of this range. MOQ on HIGH PULSE CONSTANT PRESSURE HYDRAULIC HOSE 642 SERIES is 100 m on standard items.
WHY THIS HOSE
Where the Top Rung Is Cheap
A constant-pressure ladder is not a straight line. On this rung the wall arrives early and then stops growing.
13.2 mm at 6.4
The same outside diameter and the same 50 mm arc as 628, at 420 bar instead of 280. Two sizes carry the class for free.
150 mm at 9.5
The step. Outside diameter goes from 16.8 mm to 20.9 mm and the arc from 65 mm to 150 mm, on the same 9.5 mm bore.
180 mm at 12.7
The 1/2 inch size needs nearly twice the loop of the 628 body, 180 mm against 90 mm, at 22.6 mm outside.
Converges at 2 Inch
At 25.4, 38.1 and 50.8 mm all three series share 37.8, 57.5 and 71.0 mm outside and the same arcs, so only the class differs.
168 MPa Burst
A 4:1 margin at every row. The top of the ladder does not trade margin for pressure.
Ten Bores to 2 Inch
420 bar is available from 1/4 inch to 2 inch, so a high-pressure machine can be equipped from one series.
CONSTRUCTION
Thickest Wall of the Four
Inner Tube
Oil-resistant synthetic rubber, bored 6.4 mm to 50.8 mm. Shared with the rest of the ladder.
Reinforcement
High-tensile steel wire rated 42 MPa with 168 MPa burst, measuring 11.3 to 67.8 mm across the range. It is the heaviest reinforcement of the four series.
Cover
Abrasion-resistant cover, outside diameter 13.2 mm at the 6.4 mm bore through 71.0 mm at 50.8 mm.
APPLICATIONS
Where 420 bar Is Required
High-Pressure Cylinders
12.7 mm at 180 mm arc, where the relief is set above 400 bar and the line must match.
Hydraulic Tools
7.9 mm at 420 bar on a 55 mm arc, the second size that keeps the slim body.
Press and Forming
19 mm at 280 mm arc, holding 400 bar for the full length of a stroke.
Test Benches
A single class from 1/4 to 2 inch, so a bench can be piped without mixing series.
Mining Attachment Circuits
15.9 mm at 220 mm arc, feeding a hammer that spikes above 400 bar on every blow.
Large Bore High Pressure
50.8 mm at 420 bar on a 630 mm arc, where the envelope converges with the lower rungs.
HIGH-END INDUSTRY DIRECTIONS
What Drives the 420 bar Class
It is specified where the circuit pressure cannot be reduced, which is usually a tool or a press rather than a mobile machine.
① Tools and Presses high pressure hose
Trend: Tool circuits are set above 400 bar and cannot be re-rated.
Dohose: 42 MPa with 168 MPa burst from 6.4 to 50.8 mm.
② Early Wall Penalty hose routing
Trend: Layouts assume the top class routes like the middle one.
Dohose: The 150 mm arc at 9.5 mm is published against 65 mm on 628.
③ Two Free Small Sizes compact hose
Trend: Small-bore high pressure is common on tooling.
Dohose: 6.4 and 7.9 mm match 628 at 13.2 and 14.7 mm outside.
④ Converging at Large Bore large bore hose
Trend: Above an inch the classes look the same from outside.
Dohose: 37.8, 57.5 and 71.0 mm outside shared across all three rungs.
⑤ One Series per Bench standard hose
Trend: Test benches want one bore family at one pressure.
Dohose: Ten bores all at 42 MPa.
⑥ Traceability traceable hose
Trend: High-pressure lines are logged against the duty.
Dohose: Batch, class and test date marked on each length.
WHY DOHOSE
Seven Reasons Buyers Stay with Us
Published Per Code
The High Pulse Constant Pressure Hydraulic Hose 642 Series is published code by code — 10 rows, 6.4–50.8 mm, each with its own pressure and mass.
One Factory, Whole Range
From the smallest to the largest bore in 6.4–50.8 mm, the High Pulse Constant Pressure Hydraulic Hose 642 Series is made in one plant — no second source.
Cut to the Metre
Take the length the job needs — High Pulse Constant Pressure Hydraulic Hose 642 Series is cut from the coil, with published per code published so handling can be planned.
Tested Before Boxing
Every assembly built from High Pulse Constant Pressure Hydraulic Hose 642 Series passes a hydrostatic test before it leaves the plant.
Packed for the Container
Pallet layouts for High Pulse Constant Pressure Hydraulic Hose 642 Series are planned against the container, so freight per metre stays predictable.
Private Label
Printing, labels and packing for High Pulse Constant Pressure Hydraulic Hose 642 Series can carry a distributor brand.
Same-Hour Reply
Bore, quantity and ends are enough to price High Pulse Constant Pressure Hydraulic Hose 642 Series; the reply goes out within 1 hour.
FAQ
642 Series — Ten Questions
What is the working pressure of the 642 series?
Every code is 42 MPa (420 bar) with 168 MPa minimum burst, a 4:1 margin, from the 6.4 mm bore to the 50.8 mm bore. It is the highest rung of a ladder that also covers 225, 280 and 350 bar on the same size series.
642 vs 628 — where does the wall show?
From the 9.5 mm bore. At 6.4 and 7.9 mm the two series share 13.2 and 14.7 mm outside diameter and 50 and 55 mm arcs, but at 9.5 mm the 642 body measures 20.9 mm outside against 16.8 mm, on a 150 mm arc against 65 mm.
Can 642 replace 635 in an existing boom section?
Usually not without checking the space. At 15.9 mm both are 27.7 mm outside, but the arc is 220 mm on 642 against 210 mm on 635, while at 9.5 mm the difference is far larger: 150 mm against 65 mm. The small sizes are where the check matters.
What is the arc at 9.5 mm, and at 2 inch?
The 9.5 mm code needs 150 mm, and the 50.8 mm code needs 630 mm. The smallest two codes stay at 50 and 55 mm, which is why they are the ones used where the routing is fixed.
Why does the arc jump so early on this series?
Because the wall has to carry 42 MPa at a bore where the 628 body carries 28 MPa. At 9.5 mm that shows as 20.9 mm outside against 16.8 mm and an arc of 150 mm against 65 mm, so the penalty arrives at 3/8 inch rather than at 5/8.
Why do the three series converge at 2 inch?
Because above an inch the wall required for 28, 35 and 42 MPa converges in practice: at 25.4, 38.1 and 50.8 mm all three measure 37.8, 57.5 and 71.0 mm outside with 400, 560 and 630 mm arcs.
Which bore for a 400 bar tool circuit?
The 7.9 mm code at 42 MPa on a 55 mm arc and 14.7 mm outside diameter. It is one of the two sizes that keep the slim body, so a tool line gets 420 bar without a wider loop.
Which bore for a press holding 400 bar?
The 19 mm code at 168 MPa burst on a 280 mm arc. A press holds at pressure for the length of a stroke, so the class has to cover a steady load rather than a spike, and the 4:1 margin is published per row.
What is the minimum order and lead time?
100 m per size, cut to length, across 6.4 mm to 50.8 mm inside diameter. Production runs about 20 days from confirmation, and assemblies ship crimped and pressure-tested with metric, BSP, JIC or ORFS ends.
How is the 642 series priced?
It is the top rung, so it prices above 621, 628 and 635 at the same bore: 13.2 mm outside at the 6.4 mm code through 71.0 mm at 2 inch. Send bore, length, ends and destination and a firm figure comes back the same working day.
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