Size chart
Shackle Size Chart: RR-C-271H Working Load Limit and Dimensions
Source: RR-C-271H w/ Amendment 1 (2022-01-03), the revision shown as active on ASSIST when this chart was extracted. Grade A, Class 2 and Class 3.
The two shackle types the specification defines for general use including overhead lifting, on one page: the mechanical-property table that gives the working load limit by nominal size, plus an index into the dimension table for each type.
At a glance
Nominal size 1/2 in carries a Grade A working load limit of 4,000 lbf (2 short ton); 3/4 in carries 9,500 lbf (4.75 short ton). Grade B figures appear in a separate reference column and are outside the covered range.
Printable chart
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Working load limit by nominal size
Table VIII is the specification's mechanical-property table: working load limit against nominal size D, with Grade A and Grade B in separate columns. The Grade A column applies to Type IVA and Type IVB, and to Class 1, Class 2 and Class 3 alike, so it is published once here instead of being repeated on each type page. The figures are the specification's own values, not a general commercial working load limit for any particular brand.
| Nominal size D (in) | PIN size number | WLL Grade A (lbf) | WLL Grade A (short ton) | WLL Grade B (lbf) | Same-scope vendor instances |
|---|---|---|---|---|---|
| 3/16 | 03 | 650 | 0.325 | 1,000 | G-209 1/3 t · G-2130 1/3 t |
| 1/4 | 04 | 1,000 | 0.5 | 1,500 | G-209 1/2 t · G-210 1/2 t · G-2130 1/2 t · G-2150 1/2 t |
| 5/16 | 05 | 1,500 | 0.75 | 2,500 | G-209 3/4 t · G-210 3/4 t · G-2130 3/4 t · G-2150 3/4 t |
| 3/8 | 06 | 2,000 | 1 | 4,000 | G-209 1 t · G-210 1 t · G-2130 1 t · G-2150 1 t |
| 7/16 | 07 | 3,000 | 1.5 | 5,200 | G-209 1-1/2 t · G-210 1-1/2 t · G-2130 1-1/2 t · G-2150 1-1/2 t |
| 1/2 | 08 | 4,000 | 2 | 6,600 | G-209 2 t · G-210 2 t · G-2130 2 t · G-2150 2 t |
| 5/8 | 10 | 6,500 | 3.25 | 10,000 | G-209 3-1/4 t · G-210 3-1/4 t · G-2130 3-1/4 t · G-2150 3-1/4 t |
| 3/4 | 12 | 9,500 | 4.75 | 14,000 | G-209 4-3/4 t · G-210 4-3/4 t · G-2130 4-3/4 t · G-2150 4-3/4 t |
| 7/8 | 14 | 13,000 | 6.5 | 19,000 | G-209 6-1/2 t · G-210 6-1/2 t · G-2130 6-1/2 t · G-2150 6-1/2 t |
| 1 | 16 | 17,000 | 8.5 | 25,000 | G-209 8-1/2 t · G-210 8-1/2 t · G-2130 8-1/2 t · G-2150 8-1/2 t |
| 1-1/8 | 18 | 19,000 | 9.5 | 30,000 | G-209 9-1/2 t · G-210 9-1/2 t · G-2130 9-1/2 t · G-2150 9-1/2 t |
| 1-1/4 | 20 | 24,000 | 12 | 36,000 | G-209 12 t · G-210 12 t · G-2130 12 t · G-2150 12 t |
| 1-3/8 | 22 | 27,000 | 13.5 | 42,000 | G-209 13-1/2 t · G-210 13-1/2 t · G-2130 13-1/2 t · G-2150 13-1/2 t |
| 1-1/2 | 24 | 34,000 | 17 | 50,000 | G-209 17 t · G-210 17 t · G-2130 17 t · G-2150 17 t |
| 1-5/8 | 26 | 40,000 | 20 | 58,000 | Standard only |
| 1-3/4 | 28 | 50,000 | 25 | 68,000 | G-209 25 t · G-210 25 t · G-2130 25 t · G-2150 25 t |
| 2 | 32 | 70,000 | 35 | 86,000 | G-209 35 t · G-210 35 t · G-2130 35 t · G-2150 35 t |
| 2-1/4 | 36 | 80,000 | 40 | 120,000 | Standard only |
| 2-1/2 | 40 | 110,000 | 55 | 160,000 | G-209 55 t · G-210 55 t · G-2130 55 t · G-2150 55 t |
| 2-3/4 | 44 | 120,000 | 60 | 180,000 | Standard only |
| 3 | 48 | 170,000 | 85 | 220,000 | G-2130 85 t · G-2150 85 t |
| 3-1/2 | 56 | 240,000 | 120 | 280,000 | G-2130 120 t |
| 4 | 64 | 300,000 | 150 | 350,000 | G-2130 150 t |
Rows carrying a vendor instance were cross-checked against that manufacturer's published table for the same type, class and grade. The value shown on this page is always the specification's. The sizes 1-5/8, 2-1/4, 2-3/4 in have no comparable commercial model at that nominal size and are marked as coming from the standard alone.
Grade B is a reference column only. Grade B (high strength) is outside the covered range of this chart and is not dimensioned or promoted here.
Type index
The specification sorts shackles by type first and by class of pin second. Both types are published as separate pages because their dimension tables differ: the anchor type carries an additional bow-width column.
Anchor shackle size chart
Type IVA: wider body, so the load can articulate sideways in the eye. Carries the additional bow-width column B.
Open chartChain shackle size chart
Type IVB: narrower body built for a straight pull, typically at the end of a chain or sling leg.
Open chart| Specification type | PIN code | Dimension table | Classes covered | Sizes with geometry | Nominal size range | WLL range (Grade A) | Open |
|---|---|---|---|---|---|---|---|
| Type IVA | A41 | Table IX | Class 2, Class 3 | 22 | 3/16–4 in | 0.325–150 t | Open chart |
| Type IVB | A42 | Table XII | Class 2, Class 3 | 22 | 3/16–4 in | 0.325–150 t | Open chart |
The trade names bow and D (dee) are used commercially for these two shapes, but they are not the specification's categories and are not interchangeable with them. This chart is filed under the specification's own type and class names.
Covered range
- Type IVA (anchor) and Type IVB (chain) shackles.
- Class 2 (screw pin) and Class 3 (bolt, nut and cotter).
- Grade A (regular) for the values shown; Grade B appears as a reference column only.
- Nominal sizes 3/16 in through 4 in, the 23 sizes listed in the specification's own table.
- Values are transcribed from RR-C-271H w/ Amendment 1: Table VIII for working load limit, Table IX and Table XII for dimensions.
- Class 1 (round pin and cotter) is outside the covered range. The specification notes that it is intended for general use except overhead lifting; it shares the geometry table but its pin arrangement is not charted here.
- The revision named above is the one shown as active when this chart was extracted. The source document instructs readers to verify the version before use; this chart does not claim to track later revisions.
- The revision used here consolidated what earlier revisions published as six separate per-class dimension tables into one table per type. Dimensions are therefore identical for Class 2 and Class 3, and this chart does not split them.
- Nominal size 2-3/4 in has a working load limit row but no geometry row in the specification's dimension table; dimension cells for that size are left empty rather than extrapolated.
- No value on this page is rounded, averaged or interpolated. Millimetre figures are conversions of the inch values and carry one decimal place.
- Metric-design shackles, sizes outside the 3/16 in to 4 in range, and forged shackles to other standards are outside this chart.
Basis and sources
How the figures are read
- Working load limit comes from Table VIII of RR-C-271H w/ Amendment 1, the mechanical-property table. Proof load is 2.2 x the working load limit and minimum breaking strength is 5 x the working load limit, both derived from the same table.
- The Grade A column is joined to dimensions on nominal size D alone. Grade and type are not part of the join, because the specification's Grade A column is the same for both types and for Class 1, Class 2 and Class 3.
- Dimensions come from Table IX for Type IVA and Table XII for Type IVB, each with the column semantics the specification gives: D nominal size, P pin diameter, E a reference eye diameter, W width between eyes, L inside length, B bow width (Type IVA only) and R outside eye diameter.
- Grade A values were independently cross-checked against vendor tables for 20 of the 23 sizes, using models the manufacturer states meet the same type, class and grade. The sizes 1-5/8, 2-1/4, 2-3/4 in have no comparable commercial model at that nominal size and are marked as standard only in the table above.
- Millimetre columns are a straight conversion at 1 in = 25.4 mm and are not normative. Where the specification itself is the authority, use the inch values.
G-209 · G-210 · G-2130 · G-2150
References
- RR-C-271H w/ Amendment 1, Chains and Attachments, Carbon and Alloy Steel, 3 January 2022 - Table VIII, mechanical properties, page 17
- RR-C-271H w/ Amendment 1 - Table IX, Type IVA anchor shackles, page 20
- RR-C-271H w/ Amendment 1 - Table XII, Type IVB chain shackles, page 22
- RR-C-271H w/ Amendment 1, section 6.1.3 - intended use of Class 1 against Class 2 and Class 3 shackles, page 40
- Vendor tables for the same type, class and grade, used as independent second-source instances only; the figures published here are the specification's
Cite this chart
YAXIIO. Shackle Size Chart: RR-C-271H Working Load Limit and Dimensions. https://www.yaxiio.com/en/tools/shackle-size-chart (accessed 2026-10-29).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
Frequently asked questions
What does the nominal size of a shackle mean?
It is a trade size, not a measured dimension of a single part. In the specification's table the nominal size sits beside a minimum body dimension D: a shackle sold as 1/2 in has a minimum D of 0.48 in, a minimum pin diameter of 0.61 in and an inside length of 1.88 in. Measuring a shackle and comparing the result with the trade size will usually produce a disagreement, because the trade size is a label and the dimensions carry minimums and tolerances.
Why is the working load limit the same for anchor and chain shackles?
Because the specification publishes one mechanical-property table for both. Table VIII gives a working load limit against nominal size D with a Grade A and a Grade B column, and that table applies to Type IVA and Type IVB alike and to Class 1, Class 2 and Class 3. Shape changes the geometry, not the rated load in this standard. An individual manufacturer may publish a different figure for a particular model, which is why the figures here are presented as the specification's own values.
Screw pin, or bolt, nut and cotter - how do I choose?
By how often the shackle is opened and how exposed the joint is. The screw pin (Class 2) is one threaded pin with no separate fastener to lose, and suits a shackle that is assembled and taken apart repeatedly. The bolt, nut and cotter type (Class 3) adds a nut and a cotter pin that positively retain the bolt, the usual choice where vibration could work a threaded pin loose or where an inspection is expected to find a locking device. In this standard both classes carry the same rated load and share the same dimensions; the difference is in the pin assembly, not the body.
Do Class 2 and Class 3 shackles have different dimensions?
Not in the revision used here. Earlier revisions published separate dimension tables per class; this revision consolidates them into one table for Type IVA and one for Type IVB, covering Class 1, Class 2 and Class 3. That is why this chart shows one dimension row per nominal size rather than one row per class.
Where are the millimetre dimensions?
In the same tables, as additional columns converted from the inch values at 1 in = 25.4 mm. There is no separate metric page, because the specification itself is written in inch-pound units; the millimetre columns exist so a figure can be compared directly against a drawing or a tape measure without converting by hand.
What does the standard only marker mean?
Each figure on this page is transcribed from the specification's own tables. Where a manufacturer publishes a table for the same type, class and grade, that table was used as an independent check on the figure; 20 of the 23 sizes have such a check and the table records it row by row. The sizes 1-5/8, 2-1/4, 2-3/4 in are not offered by the manufacturers checked as a comparable commercial model, so they are marked as coming from the standard alone rather than being left to look doubly verified.
Which revision is this chart based on, and does a newer one exist?
The figures come from RR-C-271H w/ Amendment 1 (2022-01-03), the revision shown as active on the ASSIST record for this specification when the chart was extracted. The source document itself instructs readers to verify the version before use. This chart states its revision on the page rather than describing itself as the version in force, and later revisions are not tracked automatically: if the specification is reissued, the chart has to be re-extracted.
Need shackles to this specification?
Send the nominal size, class and grade and we will quote against RR-C-271H: state the type (anchor or chain), the class (screw pin, or bolt, nut and cotter), the nominal size, the quantity and any finish or test-certificate requirement.
Request a quoteRelated References
Anchor Shackle Size Chart
Type IVA dimensions for the 23 nominal sizes, with millimetre conversion columns.
Chain Shackle Size Chart
Type IVB dimensions for the 23 nominal sizes, with millimetre conversion columns.
Bolt Size Chart
Metric and inch bolt sizes with head dimensions, for the fasteners a bolted lifting assembly is built from.
Figures are transcribed from {std} as published on ASSIST and are given for reference and comparison. The working load limit of a specific product is set by that product's own documentation and markings, which govern in use. This page is not a substitute for the standard, for a lift plan, or for a competent person's assessment.
Grade A, Class 2 and Class 3, nominal sizes {sizeMin} in to {sizeMax} in; {sizes} sizes transcribed from Table VIII, cross-checked against vendor tables for {secondSourceCount} of them. Values are the specification's own, not a product rating.