Transmission chain

power transmissionwear-resistant steelround

Product overview
Wear resistant round link chain for industrial conveyors, lifting and heavy-duty transmission applications. Brand: TOPONE CHAIN. Available heat-treatment grades: LTT (G90), QO (G60), C‑N (G40). Range of standard sizes from 14 x 50 up to 42 x 146 (d x P).

Heat treatments and mechanical properties

• LTT (G90): low-temperature tempering below A1 to raise breaking load and hardness at the expense of elongation. Typical hardness ≈ 40–42 HRC (~390 HB). Elongation ≈ 14%.
• QO (G60): quenching only (above AC3) to increase overall hardness; reduced elongation and some loss of breaking load. Typical hardness ≈ 45–47 HRC (~450 HB). Elongation ≈ 10%.
• C‑N (G40): carbonitriding creates a hard surface shell (depth up to ~15% of chain diameter) with very high surface hardness (up to ≈64 HRC / ~800 HV) and a softer core; core relative elongation ≈ 1–3.5%.

Dimensions & Weight (selected sizes)

• 14 x 50 — Diameter (d): 14 ±0.4 mm — Pitch (P): 50 ±0.5 mm — Inside Width (b1 min.): 17 mm — Outside Width (b2 max.): 48 mm — Weight: 4.0 kg/m
• 18 x 64 — d: 18 ±0.5 mm — P: 64 ±0.5 mm — b1 min.: 21 mm — b2 max.: 60 mm — Weight: 6.6 kg/m
• 19 x 64.5 — d: 19 ±0.6 mm — P: 64.5 ±0.6 mm — b1 min.: 22 mm — b2 max.: 63 mm — Weight: 7.4 kg/m
• 22 x 86 — d: 22 ±0.7 mm — P: 86 ±0.9 mm — b1 min.: 26 mm — b2 max.: 73 mm — Weight: 9.5 kg/m
• 24 x 86 — d: 24 ±0.7 mm — P: 86 ±0.9 mm — b1 min.: 28 mm — b2 max.: 79 mm — Weight: 11.6 kg/m
• 24 x 87.5 — d: 24 ±0.7 mm — P: 87.5 ±0.9 mm — b1 min.: 28 mm — b2 max.: 79 mm — Weight: 11.5 kg/m
• 26 x 92 — d: 26 ±0.8 mm — P: 92 ±0.9 mm — b1 min.: 30 mm — b2 max.: 85 mm — Weight: 13.7 kg/m
• 30 x 108 — d: 30 ±0.9 mm — P: 108 ±1.1 mm — b1 min.: 34 mm — b2 max.: 97 mm — Weight: 18.0 kg/m
• 34 x 126 — d: 34 ±1.0 mm — P: 126 ±1.3 mm — b1 min.: 38 mm — b2 max.: 110 mm — Weight: 22.7 kg/m
• 38 x 126 — d: 38 ±1.1 mm — P: 126 ±1.4 mm — b1 min.: 42 mm — b2 max.: 121 mm — Weight: 30.1 kg/m
• 38 x 137 — d: 38 ±1.1 mm — P: 137 ±1.4 mm — b1 min.: 42 mm — b2 max.: 121 mm — Weight: 29.0 kg/m
• 42 x 137 — d: 42 ±1.1 mm — P: 137 ±1.4 mm — b1 min.: 48 mm — b2 max.: 137 mm — Weight: 36.9 kg/m
• 42 x 146 — d: 42 ±1.1 mm — P: 146 ±1.5 mm — b1 min.: 48 mm — b2 max.: 137 mm — Weight: 36.0 kg/m

Test force and minimum breaking force by size (kN)

• 14 x 50 — LTT G90: Test 175 kN — Breaking 277 kN; QO G60: Test 125 kN — Breaking 185 kN; C‑N G40: Test 75 kN — Breaking 123 kN
• 18 x 64 — LTT G90: Test 288 kN — Breaking 458 kN; QO G60: Test 190 kN — Breaking 305 kN; C‑N G40: Test 125 kN — Breaking 205 kN
• 19 x 64.5 — LTT G90: Test 319 kN — Breaking 510 kN; QO G60: Test 213 kN — Breaking 340 kN; C‑N G40: Test 143 kN — Breaking 227 kN
• 22 x 86 — LTT G90: Test 425 kN — Breaking 684 kN; QO G60: Test 285 kN — Breaking 456 kN; C‑N G40: Test 190 kN — Breaking 304 kN
• 24 x 86 / 24 x 87.5 — LTT G90: Test 500 kN — Breaking 814 kN; QO G60: Test 340 kN — Breaking 540 kN; C‑N G40: Test 225 kN — Breaking 362 kN
• 26 x 92 — LTT G90: Test 595 kN — Breaking 955 kN; QO G60: Test 400 kN — Breaking 637 kN; C‑N G40: Test 265 kN — Breaking 425 kN
• 30 x 108 — LTT G90: Test 793 kN — Breaking 1270 kN; QO G60: Test 525 kN — Breaking 848 kN; C‑N G40: Test 350 kN — Breaking 565 kN
• 34 x 126 — LTT G90: Test 1020 kN — Breaking 1635 kN; QO G60: Test 680 kN — Breaking 1089 kN; C‑N G40: Test 450 kN — Breaking 725 kN
• 38 x 126 / 38 x 137 — LTT G90: Test 1275 kN — Breaking 2040 kN; QO G60: Test 850 kN — Breaking 1360 kN; C‑N G40: Test 565 kN — Breaking 906 kN
• 42 x 137 / 42 x 146 — LTT G90: Test 1550 kN — Breaking 2495 kN; QO G60: Test 1038 kN — Breaking 1662 kN; C‑N G40: Test 693 kN — Breaking 1108 kN

Characteristics / Technical specifications

• Product: Wear Resistant Round Link Chain
• Brand: TOPONE CHAIN
• Available heat treatments/types: LTT (G90), QO (G60), C‑N (G40)
• Hardness examples: LTT ≈ 40–42 HRC (~390 HB); QO ≈ 45–47 HRC (~450 HB); C‑N surface up to ≈64 HRC (~800 HV)
• Elongation examples: LTT ≈ 14%; QO ≈ 10%; C‑N core relative elongation ≈ 1–3.5%
• Carbonitriding shell depth: up to ~15% of chain diameter
• Size range: from 14 x 50 to 42 x 146 (various d x P combinations)
• Per-size test forces and minimum breaking forces: see Test force section above
• Weights per meter provided for each size: see Dimensions & Weight section above