Complex multi-axis equipment often demands driving multiple shafts rotating in opposing directions from a single motor source. Integrating a high-flexibility double-sided v-belt provides an efficient power transmission solution, allowing a single continuous drive belt to snake through intricate serpentine pulley configurations without twisting or rolling out of alignment.
As an established B2B manufacturer certified with ISO 9001:2015 and ISO 14001:2015, Kaihong produces engineered rubber components tailored for agricultural harvesting equipment, industrial textile frames, and multi-spindle processing machinery. Our dual-angle belts deliver exceptional flex-fatigue endurance, reliable shock-load damping, and antistatic properties (ISO 1813) under severe working environments worldwide.
Also commonly referred to as a hexagonal V-belt or double-angle belt, the cross-section forms a perfectly symmetrical hexagon—resembling two classical V-belts joined back-to-back along their top surfaces.
The primary mechanical innovation lies in the placement of the internal load carcass. In a standard single-sided belt, the tensile cords reside near the outer top edge, permitting flexing in only one direction. In a double-sided v-belt, the load cord is located precisely at the section's mid-height (the neutral axis), flanked by identical rubber wedge compounds above and below.
Both upper and lower trapezoidal faces act as active working surfaces. As the belt travels through complex machinery, both faces wedge firmly into pulley sheaves, enabling one belt to power multiple driven shafts simultaneously.
Because the tensile cord sits along the neutral flex axis, the cross-section accommodates repeated inner and outer reverse bending along an S-shaped path without creating destructive tension differentials or cord shear.
Replacing multiple single-sided drive loops with a single double-sided component substantially reduces total sheave stack width, allowing machinery designers to compress overall drive housing dimensions.
Kaihong utilizes premium synthetic elastomers and high-tenacity tensile cords engineered to resist continuous flex-fatigue and thermal oxidation.
| Layer | Material | Function |
| Outer cover | Rubber-impregnated polyester-cotton canvas | Wraps both working faces; resists abrasion, oil, and side friction |
| Upper wedge compound | NR / SBR / CR high-elasticity rubber | Upper working surface; engages upper pulley grooves |
| Tensile member (neutral axis) | Low-elongation polyester cord (Aramid available) | Positioned at mid-height; provides bidirectional flex strength |
| Lower wedge compound | NR / SBR / CR high-elasticity rubber | Lower working surface; engages lower pulley grooves |
Both upper and lower working profiles maintain a uniform 40° wedge angle, matching conventional industrial V-belt sheaves. Consequently, an AA, BB, CC, or DD double-sided v-belt drops directly into standard A, B, C, or D groove profiles without requiring custom pulley re-tooling during equipment retrofits.
Kaihong supplies four primary imperial-matched section profiles designed to support standard industrial and agricultural power transmissions:
| Section | Top Width (mm) | Belt Height (mm) | Wedge Angle | Equivalent Single-Sided Section |
| AA / HAA | 13.0 | 10.0 | 40° | A |
| BB / HBB | 17.0 | 13.0 | 40° | B |
| CC / HCC | 22.0 | 17.0 | 40° | C |
| DD / HDD | 32.0 | 25.0 | 40° | D |
Operating Range & Options: Standard chloroprene (CR) rubber compounds operate within a temperature window of -30°C to +80°C. Heavy-duty aramid (Kevlar) tensile cords, heat-resistant polymers, oil-resistant covers, and antistatic properties meeting ISO 1813 specs are available upon request.
A critical engineering rule must be applied when sizing a double-sided v-belt to prevent premature overload and drive failure.
A double-sided belt transmits approximately 50% of the horsepower rating of a single-sided classical V-belt with equivalent top width. Because only half of the hexagonal profile transmits torque in a given direction while the opposite half engages reverse-driven sheaves, load capacity per working face is reduced.
1. Calculate Design Power: Multiply prime mover power by an appropriate service factor (use 1.4 to 1.6 for shock-heavy agricultural duty).
2. Apply De-Rating Factor: Divide the single-sided power capacity by 0.50 to select the correct section profile (AA, BB, CC, or DD).
3. Verify Minimum Sheave Diameters: Ensure pulley pitch diameters meet minimum limits (~80 mm for AA, ~125 mm for BB, ~224 mm for CC). Maintain maximum belt speeds below 30 m/s.
Wherever a power drive requires "single-plane layout + multiple sheaves + counter-rotation + compact width," double-sided hexagonal belts represent the industry standard.
Extensively used across combine harvester reel drives, cleaning fan systems, straw walker drives, baler pickup mechanisms, forage harvester cutterheads, and multi-point tractor PTO shafts.
Powers multi-shaft drive trains in commercial rice mills, cotton gins, textile spinning frames, and fabric dyeing machinery.
Integrated into rock crushers, chemical tank agitators, serpentine material handling conveyors, automated packaging machines, commercial lawn mower decks, and agricultural ventilation fans.
Because hexagonal belts operate in multi-pulley serpentine paths, strict alignment and handling practices are required to protect internal cords.
All drive and driven sheaves must be aligned strictly within the same geometric plane. Out-of-plane misalignment creates severe side-wall loading, belt twisting, rapid edge wear, and early failure.
Fully loosen system tensioning pulleys prior to fitting. Never force or pry belts over sheave lips using crowbars or screwdrivers, as prying fractures the central tensile cords along the neutral axis.
During routine maintenance, inspect both top and bottom working faces for glazing, sidewall cracking, or rubber wear. Because both faces transmit power, inspecting only the visible outer face can miss hidden wear on the lower wedge.
It can physically fit, but it is not cost-effective. On a simple two-pulley drive engaging only one face, a classical single-sided V-belt transmits twice the power at a lower cost. Double-sided belts should be reserved for serpentine drives requiring reverse-direction shaft rotation.
The letter "H" indicates a banded double-sided V-belt, where multiple hexagonal belts are joined across their top surface by a tie-band into an integral unit. Single double-sided belts use AA, BB, CC, or DD designations. Specify whether a banded (H) version is required when ordering.
Double-sided belts operate in multi-axis serpentine layouts involving high reverse-flexing frequency and continuous double-sided friction. Service life reflects higher dynamic flex cycles per minute. If your drive rotates in one direction on a single plane, choose a standard classical V-belt instead.
Yes. Kaihong provides OEM manufacturing for non-standard pitch lengths, high-load Aramid (Kevlar) tensile cord construction, and specialized heat or oil-resistant rubber compounds. Contact our engineering team with your operating parameters.
Looking for durable, high-precision drive components for agricultural machinery exports or industrial equipment servicing? Certified to ISO 9001:2015 and ISO 14001:2015, Kaihong delivers exact dimensional tolerances, robust rubber compounding, and competitive factory-direct pricing.
Request Technical Assistance: Send us your profile specs (AA, BB, CC, DD, or banded H-series), belt lengths, or annual purchase requirements today to receive a detailed quote and engineering support within 24 hours.
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