A global supplier of specialty rubber seals and shock absorbers.
Strong manufacturing and R&D capabilities.
More than 30 years of R&D and manufacturing experience.
Views: 0 Author: Site Editor Publish Time: 09-20-2025 Origin: Site
Who we are: 30 years in rubber products, TÜV/ISO certified; OE#/drawing customization, small MOQs & rapid prototyping.
Product highlights: Multiple materials (NBR/EPDM/CR/Silicone/TPU), Shore A 50–90; temperature –60 to 200 °C (by material); ozone/coolant resistant with high compression rebound; Metric/Imperial threads; flange/clamp/bayonet structures.
Figure: Threaded dust cover product photo (TPU/NBR options).
Why a Threaded Dust Cover: Working Principle & Value
How it works
A bellows-style dust cover uses convolutions to maintain a seal throughout stroke. Ends are fixed to the moving rod/screw and housing via threaded, flanged, bayonet or clamped connections to block dust, mud, coolant, and chips from entering critical areas while offering stroke compensation and vibration isolation. Convolutions provide travel (typical compression ratio 2.5–4.0:1). Material determines temperature/chemical compatibility; end sealing dictates IP level and service life.
Value
• Extends screw/seal/bearing life by 2–5×.
• Improves reliability & MTBF, reducing downtime.
• Low-cost, quick replacement; supports consistent branding (color/logo/laser code).
Takeaway: Correct material + compression ratio + end sealing = durability and stability.
Next step: Use the workflow below to confirm dimensions and material, then request samples/quote.
Applications (Typical)
• Lead screws & linear modules: CNC, 3D printing, automation lines
• Hydraulics & pneumatics: rod dust protection & buffering
• Machine tools & fixtures: coolant/metal chips environments
• Automotive chassis: rack & pinion, struts, ball joints, links
• Construction & mining equipment: mud, dust, ozone, UV exposure
• Others: camera sliders, medical rails, access actuators
Takeaway: Widely applicable, but media & temperature vary—material choice is critical.
Next step: Confirm industry + min/max temperature + media, then proceed to selection.
Selection Workflow (One-and-Done)
1) Confirm thread or interface: Metric (e.g., M36×2), Imperial (e.g., 1-1/2"-12 UNF), or record flange/clamp/bayonet details.
1) Measure dimensions: ID/OD of mating surfaces (H9/h9), natural length L, compressed length Lc, convolution count N, and stroke S (recommend S ≤ Lc × 0.7).
1) Set compression ratio & stroke: L/Lc typically 2.5–4.0; keep ≥10% margin to avoid bottoming or over-stretch.
1) Define media & temperature: oils/coolant/ozone/UV/salt spray/welding spatter; –60 to 200 °C by material.
1) Pick material & hardness (Shore A 50–90).
1) Confirm structure: threaded / flange / clamp / bayonet quick-release.
1) Special requirements: food-grade, anti-static, high-pressure washdown, color/logo.
Takeaway: Accurate dimensions + material fit + structure match deliver first-fit success.
Next step: Send interface, L/Lc/N/S, media/temperature—receive a 24–48 h sample plan.
Materials & Performance Comparison
Material | Typical Temp | Media Resistance | Ozone/UV | Rebound/Fatigue | Cost | Typical Uses | Notes |
NBR | –30~120 °C | Excellent to oils/fuels/greases | Fair | Good | $ | Hydraulics, chassis | Poor to ozone; standard black |
EPDM | –40~140 °C | Coolant/water/steam | Excellent | Medium | $ | Machine tools, outdoor | Poor to mineral oils |
CR (Neoprene) | –35~120 °C | Balanced oil + ozone | Good | Good | $$ | Construction equipment | Middle-ground choice |
Silicone (VMQ) | –60~200 °C | Neutral chemicals | Good | Medium | $$$ | Extreme temp/medical | Lower tear strength; beefier lips |
TPU | –40~90 °C | Wear/coolants | Good | Excellent (abrasion) | $$ | Linear modules, chip shield | High strength; optional clear |
Takeaway: Oil → NBR/CR; Coolant/Outdoor → EPDM; Extreme temp → Silicone; Abrasion/linear actuators → TPU.
Next step: Shortlist 1–2 materials; share hardness & color.
Quick Spec Table (Examples & Customization)
Model | Interface | A (ID) | B (OD) | L | Lc | N | S | Material/Hardness | Notes |
HM-DC-M36×2-150 | M36×2 | 36 | 52 | 150 | 55 | 12 | 70 | NBR 65A | Lead screw/lathe |
HM-DC-1.5-12UN-180 | 1.5"-12 UN | 38.1 | 56 | 180 | 60 | 14 | 80 | EPDM 70A | Coolant splash |
HM-DC-FL50-160 | Flange Ø50 | 50 | 78 | 160 | 64 | 10 | 65 | TPU 80A | Wear-resistant |
HM-DC-QUICK48-140 | Bayonet 48 | 48 | 70 | 140 | 58 | 9 | 55 | CR 70A | Quick service |
Customization: Metric/Imperial threads, flange PCD/slot, color/logo, food-grade/ESD. OE#/drawing builds supported; friendly MOQ.
Structures & Manufacturing
End-connection options
• Threaded: precise positioning; recommend face O-ring/liquid sealant.
• Flange: ideal for large diameters/frequent removal; even bolt preload.
• Clamp/Bayonet: fast assembly; ensure lock reliability & anti-vibration.
Manufacturing processes
• Compression molding (NBR/EPDM/CR): thick walls, stable convolutions; low tooling cost.
• Transfer/Injection: higher throughput, tighter tolerance; best for volume.
• TPU forming: thermoplastic; abrasion-resistant, optional clear; ideal for long-stroke thin walls.
Takeaway: Structure drives assembly efficiency; process drives consistency & cost.
Next step: Choose by volume/tolerance; we provide DFM optimization.
Installation Steps & Notes (Torque/Alignment/Sealant)
• Prep interfaces: deburr and degrease; verify threads/flanges are intact.
• Concentric assembly: keep bellows coaxial; avoid pre-stretch >10%.
• Threaded end: hand-tight, then wrench-tighten; never grip the convolutions.
• Flange/clamp: cross-tighten to prevent distortion.
• Sealant: apply neutral-cure RTV (oil-resistant for NBR/CR; water-resistant for EPDM).
Fastener | Torque (Nm) | Note |
Worm-drive clamp with M6 screw | 4–6 | 304 SS; avoid over-tightening |
Clamp with M8 bolt | 8–12 | Grade 8.8 |
Flange bolt M6 | 7–9 | Cross-tighten |
Flange bolt M8 | 16–22 | Cross-tighten |
Thread-lock (optional) | Loctite 222 | For anti-loosening only |
Run-in test: cycle full stroke 2–3×; verify no rub/no leak.
Takeaway: Coaxiality + proper preload + correct sealant = maximum life.
Next step: Download the Installation Card (PDF) & Warranty Terms.
Troubleshooting
• Cracking: wrong material/temperature, ozone, over-stretch → switch to EPDM/Silicone/TPU; correct compression ratio.
• Detachment: insufficient preload/unlocked bayonet/loosened thread → re-torque to spec, add low-strength thread-locker.
• Seepage/leak: uneven faces/wrong sealant → clean & reseal with neutral RTV, or add O-ring.
• Early aging: oil or coolant attack → choose NBR (oil) or EPDM (coolant); add shield.
• Convolution wear-through: inadequate stroke or interference → increase convolutions/compression ratio or use abrasion-resistant TPU.
FAQ
Q: How do I determine compression ratio?
A: Use 2.5–4.0:1 with 10% margin.
Q: How do I choose the right material?
A: Oils → NBR/CR; Coolant/Outdoor → EPDM; Extreme temps → Silicone; Abrasion/transparent → TPU.
Q: What hardness should I specify?
A: Typically 60–80A; 75–90A for washdown/abrasion; 50–60A for low-temperature impact.
Q: Do you support Imperial threads and quick-release?
A: Yes—UN/UNF/UNC threads plus flange/clamp/bayonet hardware.
Q: Sample lead time & MOQ?
A: Stock/standard ship quickly; customs drawn within 24–48 h with friendly MOQs.
Q: How is warranty handled?
A: Batch traceability; follow installation card and duty conditions.
