Περιγραφή
Car parking chains are purpose-built safety barriers designed to secure vehicles in designated spaces, control access points, and define safe zones within parking facilities. Unlike swing-arm booms or fixed bollards, roller-chain barriers adapt to any span width, deliver measurable tensile resistance, and withstand outdoor exposure without structural compromise.
The ALT series covers three pitch sizes — 16ALT (25.40 mm pitch), 20ALT (31.75 mm pitch), and 24ALT (38.10 mm pitch) — each available in simplex (-1), duplex (-2), and where specified, triplex (-3) strand configurations. This gives procurement engineers a scalable load path: match the pitch to the structural requirements of the drive mechanism, then scale strand count to the required tensile strength.
Quick Reference
How to Read the ALT Series Code
The prefix number is the pitch in sixteenths of an inch: 16 = 1″ (25.40 mm) · 20 = 1¼″ (31.75 mm) · 24 = 1½″ (38.10 mm). The suffix -1 / -2 / -3 is the strand count. A duplex chain of the same pitch approximately doubles both pin length and rated tensile strength versus the simplex variant — strand count is the primary lever for scaling load capacity without changing pitch.
Full Specification Data
Προδιαγραφές αλυσίδων στάθμευσης αυτοκινήτων
| Αριθμός αλυσίδας | Pitch P (mm) |
Roller Dia. d₁ max (mm) |
Εσωτερικό πλάτος b₁ min (mm) |
Pin Dia. d₂ max (mm) |
Μήκος καρφίτσας L max (mm) |
Μήκος καρφίτσας Lc max (mm) |
Plate Depth h₂ max (mm) |
Plate Thick. T max (mm) |
Bolt Τύπος |
UTS Q min (kN) |
Avg. Tensile Q₀ (kN) |
Βάρος (kg/m) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 16ALT Series — Pitch 25.40 mm · 1″ · Bolt M20 | ||||||||||||
| 16ALT-1 | 25.40 | 15.88 | 15.75 | 7.92 | 32.7 | 36.5 | 24.0 | 3.25 | Μ20 | 71.55 | 81.8 | 2.60 |
| 16ALT-2 | 25.40 | 15.88 | 15.75 | 7.92 | 62.7 | 65.8 | 24.0 | 3.25 | Μ20 | 143.10 | 166.3 | 5.15 |
| 20ALT Series — Pitch 31.75 mm · 1¼″ · Bolt M24 | ||||||||||||
| 20ALT-1 | 31.75 | 19.05 | 18.90 | 9.53 | 40.4 | 44.7 | 30.0 | 4.00 | Μ24 | 107.85 | 118.6 | 3.91 |
| 20ALT-2 | 31.75 | 19.05 | 18.90 | 9.53 | 76.4 | 80.5 | 30.0 | 4.00 | Μ24 | 215.70 | 234.4 | 7.80 |
| 20ALT-3 | 31.75 | 19.05 | 18.90 | 9.53 | 112.2 | 116.3 | 30.0 | 4.00 | Μ24 | 323.55 | 351.6 | 11.77 |
| 24ALT Series — Pitch 38.10 mm · 1½″ · Bolt M30 | ||||||||||||
| 24ALT-1 | 38.10 | 22.23 | 25.22 | 11.10 | 50.3 | 54.3 | 35.7 | 4.80 | Μ30 | 149.20 | 161.1 | 5.62 |
| 24ALT-2 | 38.10 | 22.23 | 25.22 | 11.10 | 95.8 | 99.7 | 35.7 | 4.80 | Μ30 | 298.40 | 322.2 | 11.70 |
* UTS values in kN. Suffix -1 = simplex, -2 = duplex, -3 = triplex. All dimensions in mm.
Why ALT Series
Οφέλη από τη χρήση αλυσίδων στάθμευσης αυτοκινήτων
High Visibility & Deterrence
Available in high-visibility red/white powder-coat alternating segments. Optional flashing LED attachments provide night visibility without additional wiring infrastructure. Clear access boundary communication at a glance.
Flexible Span — Up to 20 m
Unlike fixed-width booms, ALT chains cover entrances up to 20 metres wide by linking additional sections. The M20 / M24 / M30 bolt connection allows on-site length adjustment without specialist tools.
Low-Noise Operation
Motor-driven chain barrier systems generate significantly less noise than pneumatic bollards or counterweighted boom gates — critical for residential car parks and noise-sensitive facilities.
Battery Backup Ready
Motorized chain barrier systems built around ALT chains typically support backup battery modules for continued operation during mains power interruptions — a regulatory requirement in many commercial parking codes.
Long Service Life
Carbon steel construction with precision-ground rollers and hardened pins resists wear even in outdoor installations exposed to road grit and temperature cycling. Individual link replacement avoids full-run discard.
Indoor & Outdoor Rated
The ALT series is rated for both covered and open-air installations. Zinc-plated and stainless steel variants are available for coastal or high-humidity environments where plain steel would corrode prematurely.
Selection Guide
Which ALT Series Is Right for Your Application?
16ALT
Light–Medium Duty
Residential driveways, single-lane commercial entrances, indoor parking levels. UTS 71–143 kN. Weight 2.60–5.15 kg/m.
20ALT
Medium–Heavy Duty ★ Most Popular
Multi-lane commercial car parks, logistics yards, multi-storey access gates. UTS 107–323 kN. Weight 3.91–11.77 kg/m. Triplex (-3) available.
24ALT
Βαρύ καθήκον
Wide-span industrial yards, port vehicle control, heavy truck access barriers. UTS 149–298 kN. Weight 5.62–11.70 kg/m. M30 bolt.
Drive Components
Αλυσίδες και γρανάζια στάθμευσης αυτοκινήτων
Where a parking chain barrier is driven by a motorized lifting unit, correct sprocket selection is as critical as chain selection. The sprocket pitch diameter must correspond exactly to the chain pitch — 25.40 mm for 16ALT, 31.75 mm for 20ALT, 38.10 mm for 24ALT. Tooth count determines wrap angle and lifting speed; higher tooth counts deliver smoother engagement at the cost of a larger sprocket body.
For duplex or triplex chains, verify that the sprocket face width matches the combined strand width — a mismatch in face width is the most common cause of uneven roller loading and accelerated tooth wear. Split-hub sprockets allow lateral removal without disconnecting the chain run, which simplifies maintenance in confined barrier housings.
Technical Notes
Installation & Maintenance
Tensioning
Tension the chain to eliminate sag without placing residual load on anchor posts at rest. A correctly tensioned chain deflects approximately 2–4% of span under light lateral hand pressure. Over-tensioning accelerates pin and bushing wear; under-tensioning causes chain-to-ground slap and link fatigue.
Λάδωμα
Static barrier chains: annual wipe-down with penetrating chain oil is sufficient. For chains running over driven sprockets: lubricate every 200–500 operating hours depending on ambient dust and moisture levels — same interval as the equivalent αλυσίδα κυλίνδρων application.
Inspection Checklist
Inspect annually for: (1) link elongation exceeding 3% of nominal pitch, (2) cracking or deformation of inner or outer plates, (3) roller seizing or flat spots, (4) corrosion pitting on pins or bushings. A single defective link warrants full-section replacement — it defines the failure threshold of the entire run.
Λάβετε μια προσφορά
Ordering Car Parking Chains
ALT parking chains are supplied by the metre or in standard coil lengths. When enquiring, please specify:
Custom lengths, high-visibility coatings, and stainless steel variants available on request. Contact us via roller-chain-manufacturers.com for a project-specific quotation.
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