Chains on reels: DIN 763 vs DIN 766 — what to choose

Why chains are supplied on reels

A reel is convenient packaging: the chain does not tangle, the metreage is easy to measure and the fitter quickly cuts the required length. We supply round-link chains on reels — analogues of DIN 763 and DIN 766, with cutting to measured lengths and winding to the customer's metreage.

“763” and “766” are two common German standards for chains of normal strength. They differ mainly in the link and calibration.

The main difference: long or short link

• DIN 763 — a long-link chain. The link pitch is noticeably larger than the rod diameter: the chain is flexible, “lays softly” and suits fencing, suspensions, securing cargo and decorative load-bearing tasks, where a short-link chain is inconvenient.
• DIN 766 — a short-link calibrated chain. The link is shorter and the pitch is held more precisely: the chain is compact and predictable in geometry — this matters for mechanisms and assemblies where the chain runs on a sprocket.

Russian analogues of both chains are manufactured to our TU 25.93.17-001-06515248-2020 (strength class 3). The line has four groups:

For a typical replacement, DIN 763 is closest to the non-calibrated long-link version (B2), and DIN 766 — to the short-link calibrated one (A1); with non-standard requirements, B1 and A2 are possible. The final conformity for the specific task and size is confirmed by a technologist.

When a calibrated chain is needed

Calibration means a consistent link pitch. It is needed when the accuracy of the geometry affects operation:

• the chain runs on a sprocket or in a mechanism — the pitch deviation accumulates along the length;
• one loop is assembled from several sections — the joint must match;
• the interchangeability of sections and the repeatability of the product during assembly matter.

For suspensions, fencing, securing cargo and decorative tasks, pitch accuracy is not critical — here a non-calibrated chain is sufficient.

What to choose: a short algorithm

1. Will the chain run in a mechanism or on a sprocket? You need a short-link calibrated chain — DIN 766, group A1 in our line. For lifting loads this is a different strength class — short-link calibrated T8 to our TU 25.93.17-002-06515248-2026 (catalog).
2. Suspension, fencing, securing, decor? A long-link chain will do — DIN 763, groups B1/B2.
3. Check the size and loads. Gauge, pitch, width, proof and breaking load — from the TU-001 table; how to read the designation — in the article How to decode a chain designation.
4. Decide on the packaging. Metreage, measured lengths, winding — discuss when ordering: we cut to your lengths.

Don't confuse packaging with the chain type

“On reels” is a delivery method, not a characteristic of the chain: both long-link and short-link chains are wound onto reels. Choose by the link type, calibration and load, and the metreage by the task. More details on the difference between the standards — in the article Analogues of DIN 763 and DIN 766.

Still in doubt? Describe the task: where the chain works, what load it must take, what lengths are needed. We will suggest a size and prepare a quotation.