Lift Sling Rigging Co., Ltd manufactures Hand woven nylon lifting rope, seamless nylon lifting rope — one name, and a range that runs from three millimetres to one hundred. That range is the subjec t of this page. The two words in the name do not mean the same thing at Φ5-6 as they do at Φ59-60, and the tension table printed on this page says so before anyone argues it: its own rows stop steppin g two millimetres at a time after Φ59-60, and the last three rows cover ten millimetres, five millimetres and then a single diameter. A table that changes how finely it divides the range is telling yo u the article itself changes across it. This page follows that change, band by band, and places the two words in the name at the sizes where they actually do work.

Hand Woven Nylon Lifting Rope, Seamless Nylon Lifting Rope — One Name Across Thirty-Two Sizes, and Four Places Where the Article Changes

1. Five Bands, Thirty-Two Rows, and Four Changes of Character

The customer's own table gives thirty-two diameter rows. Laid out in order they fall into five bands, and the boundaries between them are not arbitrary: they are where something about the article s tops being true.

Read the third column downward and the shape of the product appears. The strength grows roughly fortyfold from the bottom band to the top, but the number of decisions a buyer has to make grows fast er than that, because the decisions move from the body of the rope to the places where it is joined. That is the single most useful thing this page can say about the range, and every section below is one band of it.

2. Φ3-4 to Φ7-8: the Range Where the Rope Is a Hand Tool

Three rows, and the first group's ultimate strength runs 0.28, 0.50 and 0.80 tonnes. These are figures a person produces without machinery, and the article at this size is used the way a line is us ed: it is carried in the hand, passed through something, tied off, pulled, and coiled again.

Two consequences follow from that, and they explain why a page about a lifting rope has to start here.

The third thing worth saying about this band is what is not in it. The table's smallest row is Φ3-4, so a buyer who wants a two-millimetre line has no printed row to read, and the correct answer to that question is that the table does not cover it rather than a figure derived by scaling down the Φ3-4 row.

3. Φ9-10 to Φ13-14: Where the Rope Stops Being Held and Starts Being Attached

The second band is three rows and the first group runs 1.1, 1.6 and 2.5 tonnes. Nothing about the construction changes at Φ9-10; what changes is the way the article is used. A line at this size is long enough and strong enough that a person stops holding it and starts attaching it — to a load, to a structure, to another line.

That single shift moves the whole specification. Once the rope is attached, the end is the place where the load is transferred, and the end is the one part of the article the tension table says not hing about. The table gives the strength of the rope; it does not give the strength of a join, and at Φ9-10 the join has become the thing the buyer is really choosing.

4. Φ15-16 to Φ31-32: the Working Range of This Product

Nine consecutive rows, from 3 tonnes to 11.5 tonnes in the first group, and this is where most orders for this product will land. It is also the band in which the specification is most completely d ecided, because everything that affects the article is now in play at once: the fibre, the diameter, the length, and both ends.

The four rows above are a sample, not the band: all nine rows from Φ15-16 to Φ31-32 are in the parameter table printed on this page. What they show is the one design decision that the name in the t itle cannot settle, and cannot even hint at. At every row, three different figures are available for the same diameter, and they are not close to each other: at Φ31-32 the third group offers 5.7 tonne s where the first offers 11.5, a factor of two. So in the working range the fibre is not a preference, it is the first line of the specification — and because the table's first group is not named in i ts own header, that line has to be written by the buyer rather than read off the column.

The provider's own tension table is restated below in full. It is not an illustration of a point made elsewhere on this page: it is the evidence for the five bands, because the bands are the table' s own way of dividing the range. Every figure is unchanged, and the column heads are the ones the source gives.

5. Φ33-34 to Φ59-60: Where the Rope Outgrows the Coil

Fourteen consecutive rows, and the longest band in the table: from 12 tonnes at Φ33-34 to 31 tonnes at Φ59-60 in the first group. Two-millimetre stepping still holds all the way up to Φ59-60, which is the table saying that this part of the range is still quoted in the same way as the bottom of it. What changes is not how the article is specified; it is what the article does to the people and th e equipment around it.

6. Φ70-80 to Φ100: Three Rows, Three Bands, and a Change of Character

The table's last three rows are different in kind from the twenty-nine before them. Φ70-80 covers ten millimetres of the range, Φ90-95 covers five, and Φ100 is a single diameter. The stepping has s topped. A buyer who has been reading this table one two-millimetre row at a time reaches the top of it and finds that the last three lines are territories rather than points.

Two things about the top band deserve to be said plainly, because both of them are places where a reader is likely to assume rather than read.

The row is the answer. A question about a diameter of eighty-five millimetres has no printed row of its own anywhere in this table. It falls inside Φ70-80 in the sense that it is not Φ90-95 and not Φ100, but the figure for Φ70-80 is the figure for the band, and there is no printed figure for eighty-five. The honest form of the answer is to quote the band and say which band it is.< /p>

The habit of dividing by four is least reliable here. Across the whole table the ratio of ultimate strength to use tension clusters on four, and in the polyester group it sits exactly on four in twenty-four of the thirty-two rows. At Φ100 the Vinylon group's ratio is 5.08, the highest in the table, and the first group's lowest ratio in the whole table, 3.64, is at Φ70-80. The two columns separate most at the sizes where the consequences of a wrong number are largest, so at the top of the table the printed use tension should be used and nothing should be recomputed from it.

7. The Fibre Question, at Every One of Those Sizes

One thread runs through all five bands and does not change: at every row there are three figures for the same diameter, and the article is defined as much by which column was read as by which row. The column, not the diameter, is what the two buyers who ask for the same thing most often disagree about without knowing it.

The page names nylon in its title, and the strength ordering across the three groups is the ordering that nylon, polyester and Vinylon normally take. That is consistent with the unnamed gr oup being the nylon one. It is also an inference from the figures and not a statement in the table, and this page keeps the two apart: the inference is offered, the table is quoted.

8. What Changes Across the Range, and What Does Not

Putting the five bands together produces a short list of things that are true at every size and a shorter list of things that are true only above a certain one. Both lists are worth having, because an order written from the wrong one is either too vague at the top or unnecessarily complicated at the bottom.

The two columns of that table are the reason this page is organised by size rather than by feature. Almost every feature of this product — the fibre, the end, the length, the packing, the marking — behaves differently depending on where in the range you are standing, and a page that lists the features without the sizes would describe the product as if Φ5-6 and Φ100 were the same object.

9. Where the Two Words in the Name Sit in That Range

The two words in the product name are not equally useful across the thirty-two rows. Each of them does work over part of the range and very little over the rest, and placing them is the last thing this page has to do.

Read as a single instruction, the section says this: at the bottom of the range the name is the specification, and at the top of the range the name is only a heading — everything that decides the a rticle sits underneath it, in the fibre, the row, the length and the two ends. The phrase hand woven does not appear anywhere else on this site, which is worth knowing before it is used in an order: a word with no precedent has no shared meaning to fall back on, and it will be read in whichever way costs least.

10. Which Part of This Subject Is Argued Where

The subject this page belongs to is larger than the page. The rest of it is already argued elsewhere on the site, at length and with its own figures, and none of it is repeated here.

Frequently Asked Questions