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Double Flex Chain rotates on two planes, making it an ideal choice for a wide variety of applications. The pin bearing sur faces and selected sliding surfaces are induction hardened for extended wear life.
The Double Flex Chain offers a large sliding area to decrease shear on the chain and the sliding surface because design allows maximum flexibility for both horizontal and vertical movement.
This versatility allows compact layouts and economical cost. The mechanically designed cupped shape of the outer link plates of DF-3500 and DF-3910 eases side flex movement and protects rivet ends. This feature also prevents pin wear at the ends. DF-3498 offers flexibility with straight outer link plates.
The drawings shown are examples of just a few double flex chain styles. Many additional styles and configurations are available on a made-to-order basis. Sprockets are also available — split, solid, or bronze bushed.
All dimensions are nominal values and for reference only
This chain is made-to-order.
Unit of Measure


Center Bar Pitch

N/A 1.750 in

Side Bar Pitch

N/A 2.500 in

Minimum Flex Radius

N/A 18.000 in

Average Tensile Strength

N/A 50000 lb

Approx. Weight

N/A 3.900 lb/ft
Maximum Allowable Load1 N/A 4000 lb

Chain Width Specifications

A - Overall Chain Width

N/A 1.450 in

W - Inside Link Width

N/A 0.640 in

Link Plate

T - Sidebar Thickness

N/A 0.310 in

H - Sidebar Height

N/A 1.400 in

Pin Specifications


N/A 0.630 in


N/A 1.450 in
  • 1 Working load for speed length ratio V/S up to 0.6., where V = chain speed (ft./min.) and S = conveyor length (ft.). For other speed length ratios, see Table