Kuvaus
A sharp top chain is built on the geometry of a standard roller chain but adds precision-ground teeth formed directly on the link plates. Each tooth is heat-treated to a consistent surface hardness, then manufactured from specially selected alloy steel so the grip holds across the full service life — not just when the chain is new. The acute tooth profile bites cleanly into timber, log bark, and rough-sawn surfaces with minimum penetration depth, protecting wood-fibre integrity and lumber grade.
At roller-chain-manufacturers.com we supply sharp top chains in pitch families from 12.70 mm (08B) to 76.20 mm (48B), as simplex, duplex, and triplex strand configurations, in standard 3.048 m (10 ft) work lengths or customer-specified cut lengths. All dimensions and tolerances conform to ISO 1977 and DIN 8181.
Specification TableISO 1977 · Minimum Breaking Load
| Ketjun nro | Piki (mm) |
Sisäleveys (mm) |
Rullan halkaisija (mm) |
Tapin halkaisija (mm) |
Min. rikkoutumisnopeus (kN) |
Paino (kg/m²) |
|---|---|---|---|---|---|---|
| ST 08B-1 | 12.70 | 7.75 | 8.51 | 3.96 | 17.8 | 0.69 |
| ST 10B-1 | 15.875 | 9.65 | 10.16 | 5.08 | 22.2 | 0.93 |
| ST 12B-1 | 19.05 | 11.68 | 12.07 | 5.72 | 28.9 | 1.15 |
| ST 16B-1 | 25.40 | 17.02 | 15.88 | 8.28 | 60.0 | 2.71 |
| ST 20B-1 | 31.75 | 19.56 | 19.05 | 10.19 | 95.0 | 3.73 |
| ST 24B-1 | 38.10 | 25.40 | 25.40 | 14.63 | 160.0 | 7.10 |
| ST 28B-1 | 44.45 | 30.99 | 27.94 | 15.90 | 200.0 | 9.97 |
| ST 32B-1 | 50.80 | 30.99 | 29.21 | 17.81 | 250.0 | 13.45 |
| ST 40B-1 | 63.50 | 38.10 | 39.37 | 22.89 | 355.0 | 22.10 |
| ST 48B-1 | 76.20 | 45.72 | 48.26 | 29.24 | 400.0 | 35.80 |
Duplex (ST xxB-2) and triplex (ST xxB-3) strands available on request. kN values are minimum breaking loads per ISO 1977. Contact us for non-standard pitches, extended-pin attachments, or stainless steel grades.
High-Precision Tooth Geometry
Teeth are machined to an acute profile and held to close tolerances, biting cleanly into wet, bark-covered, or rough-sawn surfaces with minimum penetration depth — protecting wood-fibre integrity and finished lumber grade.
Through-Hardened Components
Pins, bushings, rollers, and side plates are individually heat-treated for optimal fatigue strength, then shot-blasted to remove surface stress risers and improve long-term lubrication retention under mill conditions.
Low-Draw Tooth Profile
The shallow draw angle distributes load across the full roller engagement arc, protecting both softwood and hardwood surfaces from bruising — critical wherever lumber grade and surface quality are commercially valued.
Triple-Alloy Steel Rivets
CNC-controlled cold-formed rivet heads deliver uniform clamping force on every link, eliminating the inconsistent heading that shortens chain life in high-vibration timber machinery such as log-haul-up systems and drum debarkers.
Spheroidised Bushings
Spheroidise-annealed bushings produce uniform bore diameter along the full length of the bushing, guaranteeing consistent pin-to-bushing clearance, even wear distribution, and predictable replacement intervals.
Factory Pre-Lubrication
Every chain leaves our facility pre-lubricated with a high-viscosity penetrating lubricant formulated specifically for sharp top chain applications — providing full protection from the very first revolution, with no break-in period required.
Log Haul-Up Conveyors
Lifts wet, debarked, or rough-sawn logs from pond or ground level up inclined ramps into the primary breakdown saw. Positive tooth engagement prevents rollback under shock loading.
Log Deck & Sorting Tables
Indexes logs accurately between sorting gates and infeed rolls without slippage, maintaining the precise spacing required for efficient cutting programs and automated scanning systems.
Debarking Lines
Feeds rotating-drum or ring debarkers at controlled speed. Sharp teeth maintain grip despite bark fragments, mud, and tannins that cause smooth chains to slip or ride over the log surface.
Green-Chain Sorting
Moves freshly sawn boards away from the primary breakdown at a steady pace. The low-draw tooth profile prevents face marking on appearance-grade softwood and hardwood lumber.
Pulpwood & Biomass
Transports pulp bolts and biomass chip-logs through chipping lines. Corrosion-resistant and stainless steel options available for outdoor, high-moisture, or chemically aggressive environments.
Sharp top chains require sprockets machined to the corresponding ISO B-series tooth form. Chain pitch is defined as the centre-to-centre distance between adjacent roller pins — expressed in millimetres for ISO-series chains, and in 1/8-inch increments for ANSI-series chains. Matching the correct sprocket pitch, tooth count, and bore to the chain pitch is critical: mismatched components accelerate pin-bushing wear on the chain and tooth-flank wear on the sprocket simultaneously, roughly halving the service interval of both components.
We supply hardened-tooth sprockets in plain bore, pilot bore, and taper-lock configurations to match every sharp top chain size listed in the specification table above. Minimum recommended tooth count for timber conveyor applications is 17 teeth per sprocket, which limits chordal action and the associated impact loading on teeth as the chain articulates at each revolution.
Compared with flat-belt or V-belt drives, sprocket-and-chain drives maintain positive engagement without slippage under shock loading — a decisive advantage in log-handling machinery where a sudden jam can momentarily spike torque several times above the running load. Chain drives are also easier to guard and maintain than belt systems in the wet, dusty, debris-laden environment of a sawmill.
Sprocket Selection Guide
| Min. tooth count | 17 T (conveyor) |
| Drive sprocket hardness | 58–62 HRC |
| Case depth (induction) | ≥ 1.5 mm |
| Hub styles | Plain / Pilot / Taper-lock |
| Standardi | ISO 606 / ANSI B29.1 |
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How to Order
01
Ketjunumero
e.g. ST 16B-1. State simplex, duplex, or triplex strand count.
02
Length & Form
Metres or link count. Specify open-end or endless loop.
03
Attachments
Extended pins, bent plates, K-attachments — note if non-standard.
04
Ympäristö
Temperature range, moisture, chemicals, abrasive debris exposure.
05
Qty & Port
Order quantity and target delivery port for shipping calculation.
Lead times: Stock sizes ship in 3–5 working days ex-works. Custom specifications (non-standard pitch, stainless steel, self-lubricating) typically require 15–20 working days. All chains manufactured to ISO 1977 and DIN 8181 as standard.
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