Chinese knots are roughly divided into 2, 3, 4, 5, 6 and 7. What is the rule of this one that says 7 1 and 72?

There is no rule at all. No.7 1 and No.72 are just the names and codes of the lines, just to distinguish them.

Jade lines are divided into: A line, B line, C line, 7 1 line, 72 line, 180 line and Baoyu line.

Line A and Line B are general special lines for Chinese knots, which are mostly used to make Chinese knot ornaments, belt buckles, coasters, hairpins, woven bags and woven daily necessities. No. jade thread is mostly used for weaving bracelets and necklaces, and the number of strands is mostly used for tassels, winding on knots, weaving rings and other small objects, as well as beading of small-aperture beads.

Jade wires with high density of 1, A, B and C have diameters of 1mm, 1.5mm and 2mm； respectively;

2.7 1 jade line is the thinnest jade line, with a diameter of only about 0.2 mm; ; No.72 jade line is thicker than 10. 7 1, about 0.7mm； in diameter;

3. Fishing line Jade line is a special kind of jade line, which is wrapped with fishing line, and its surface looks round and hard, with a diameter of about 0.5mm；;

4. Baoyu thread is an ordinary jade thread with low density and a diameter of about1mm.

Extended data:

At present, the Chinese knots sold in the market are mainly divided into domestic knots and Taiwan Province knots by region, and the quality of Taiwan Province knots is slightly higher. According to the material, there are differences between nylon thread and polyester thread. Polyester yarn is widely sold in the market, because the raw materials for polyester are cheaper, while nylon is almost half as expensive.

Line 5 is the most commonly used thread for knitting Chinese knots. We usually use line 5 or line 7 for bracelets and Chinese knots. The thickness of Line 7 is about 1.5mm, which is suitable for weaving all kinds of bracelets, Chinese knots, handicrafts and so on.

Common Chinese knot numbers:

Diameter of Line 4: 4 mm

Diameter of Line 5: 2.5mm.

Diameter of Line 6: 2MM

Diameter of Line 7:1.8mm.

Diameter of a jade thread: 1MM

B Jade line diameter: 1.5MM (similar to #7 line)

C Jade wire diameter: 2MM

7 1 jewelry thread diameter: 0.4MM

Diameter of No.72 jewelry line: 0.6mm+

Diameter of tassel line: 1MM

Diameter of elastic thread of rubber band: 1. 1MM diyjucom.