C95400 Graphite-Plugged Hanger-Bearing Sleeves for Dry-Powder Screw Conveyors
A C95400 graphite-plugged hanger-bearing sleeve is a proposed material system, not an automatic upgrade for a dry-powder screw conveyor. First confirm that an internal hanger is suitable for the bulk material and that wear debris is acceptable in the product. Then review the alloy, graphite system, shaft, lubrication and assembled support geometry together.
Identify the internal support and the material specification
KWS describes hanger bearings as replaceable journal supports between screw sections. They are different from the end bearings outside or at the trough ends. Its component guide lists several bearing materials and styles; a style number does not identify C95400 or a graphite formulation.[1]
Concast identifies C95400 as aluminium bronze and includes bearings and bushings among its typical uses. That is base-alloy information, not a qualification of graphite-plugged C95400 in a particular conveyed powder.[2]
Specify the required alloy/product standard and condition, plug material and pattern, shaft requirements, and the bearing drawing. JDB/500# does not settle those fields. Do not substitute C95500, C95800 or an EN aluminium bronze merely because the names sound related.
Scope: this is a candidate-selection guide. It does not claim BONIU holds a standard hanger bearing, has tested a powder application, or offers food-contact, explosion-protection or machine certification. Availability and qualification need separate confirmation.
Review powder flow before selecting a harder alloy
KWS states that bulk material must pass around the hanger and cautions against hangers for abrasive and sluggish material. Its bearing-series guide separately compares materials by abrasiveness. Read those as two different design questions: choosing a bearing material does not prove that the internal hanger arrangement itself is appropriate.[3][4]
| Input | Why it matters at an internal hanger | Procurement evidence |
|---|---|---|
| Particle size, shape and abrasiveness | Particles can enter the shaft/bearing interface and alter wear | Representative material description, variation and relevant handling history |
| Flow behaviour and moisture | Deposits can accumulate around the hanger and restrict passage | Normal and upset moisture, caking tendency and cleaning conditions |
| Product purity requirements | Bearing, shaft, plug or lubricant debris may enter the stream | Agreed foreign-material limits and sampling/inspection plan |
| Fill, rate and stop/restart duty | Material loading near the support may change between states | Operating sequence, throughput and loaded-start conditions |
| Shaft and trough geometry | Wear or offset can allow flight-to-trough contact | Installed alignment, shaft condition and flight clearances |
If the conveyor builder determines that an intermediate hanger is unsuitable, changing bronze grade will not resolve the obstruction. An alternative conveyor arrangement is an equipment design decision.
Make wear contamination a separate acceptance question
Original accounting example: assume a controlled trial attributes 0.8 g of bearing loss to 400 kg of conveyed material, and assume all that loss enters and mixes uniformly with that material. The calculated average is 800 mg ÷ 400 kg = 2 mg/kg. These are invented trial inputs for illustration, not BONIU measurements or an allowable contamination level.
The example explains why a small-looking wear scar can still matter to a buyer. It does not predict where particles go, their size, local peaks or chemical acceptability. Loss can also come from the shaft, plugs, fasteners or unrelated sources. Actual sampling and traceability must address the product requirements.
Separate three approvals: acceptable mechanical wear, acceptable material entering the product, and acceptable lubricant contact. “Self-lubricating” does not answer the latter two questions. If graphite release, metallic debris or any required lubricant is unacceptable, reconsider the candidate rather than relying on a dry-running label.
Inspect the hanger, shaft and screw as an assembly
Identify the supported coupling-shaft section and how each screw section connects to it. Check journal wear, shaft straightness, hanger position and the relation to adjacent supports. The motor’s torque rating is not the radial load at one hanger.
A sleeve with the correct nominal bore can still sit incorrectly if its outside profile, shoulder or retaining features do not match the hanger. For a split version, specify the matched halves and the closed assembly condition; for a one-piece version, confirm installation and removal access. Do not assume those forms are interchangeable.
Record flight-to-trough space around the support and along the adjacent sections. A rubbing flight can increase drive demand and generate debris independently of the journal material. Do not enlarge a bearing bore to hide an alignment problem or remove a hanger without the conveyor designer’s approval.
Choose a lubrication route that fits the product stream
A proposed graphite-plugged sleeve may be reviewed for a defined dry or assisted-lubrication duty, but only against the actual formulation, load, speed, temperature and counterface. A published rating for another manufacturer’s “bronze” hanger bearing is not a C95400-graphite rating and is not a BONIU specification.
- Show any external feed pipe, passage, groove and outlet on the drawing. Confirm where lubricant can travel and whether it can enter the conveyed material.
- Keep drilling, tapping and grooves clear of approved plug positions and retained sections. Do not modify a finished plugged sleeve without a drawing review.
- Select shaft material, surface condition and wear limits for the proposed pair. Reusing a scored journal can defeat a new bearing before material differences can be assessed.
- Define how powder, residual moisture and cleaning agents affect both the base alloy and the solid-lubricant system. Dry feed does not prove that every operating or cleaning state is dry.
Separate empty running from loaded conveying evidence
Before operation, inspect the installed support and clearances under the machine builder’s isolation and guarding procedures. Use its commissioning plan; an empty rotation check addresses rubbing and assembly, but cannot establish flow around the hanger or wear in representative powder.
For a controlled evaluation, agree on powder condition, feed rate, loaded starts, run duration, sampling, temperatures and inspection intervals. Record drive demand as a system observation, not a direct measurement of bearing friction. Inspect both the journal and nearby flight/trough surfaces after the agreed exposure.
Set acceptance and stop criteria before the trial. Retain the material batch, component revision, shaft measurements and operating record so a wear finding can be connected to the tested arrangement. No universal life or maintenance interval follows from the alloy name.
Frequently asked questions
Does a bronze hanger catalogue rating apply to C95400 with graphite plugs?
No. The alloy, supplied condition, lubricant system, geometry and qualification must match. A broad bronze category does not identify that finished construction.
Can a harder bearing solve powder buildup around a hanger?
Not necessarily. Flow obstruction and caking are equipment/material-handling issues. Review hanger suitability and powder conditions before changing the bearing.
Is a graphite-plugged sleeve automatically suitable for a clean product stream?
No. Consider possible release of graphite, metal and any auxiliary lubricant against the actual product acceptance requirements.
Can I order by style number and shaft diameter?
Provide the approved dimensions, hanger interface, material system and duty as well. A style designation alone does not establish the proposed alloy or installed fit.
Technical sources
- KWS: Screw conveyor hanger bearings. Support function, styles and material families; no KWS operating ratings are transferred to this candidate.
- Concast: C95400 aluminium bronze. Base-alloy identification and typical component uses, not finished plugged-bearing performance.
- KWS: Screw conveyor hangers. Hanger function, bulk-flow requirements and application cautions.
- KWS: Component and bearing series. Material-selection context by bulk-material characteristics; no automatic grade approval.
Request a drawing review
Send the hanger and sleeve sections, shaft and coupling details, outside locating profile, split or one-piece requirement, alignment and flight-clearance information, bearing reactions, speed and restart duty, powder properties, temperatures, cleaning conditions, lubricant route and product-purity requirements. Include quantity and inspection criteria. Ask BONIU to review the proposed C95400/plug system and manufacturing scope; the conveyor designer must approve application suitability.