Hall, Spek and AC-14 are representative anchor designs found in commercial ship equipment catalogs. They belong to the broader group of stockless anchors, but their names do not describe the same thing as high holding power (HHP).
The distinction is simple: stockless describes an anchor's structure; Hall, Spek and AC-14 identify designs; and HHP describes a holding-power category subject to approval requirements. An anchor can therefore be both stockless and HHP.
This guide explains how those terms fit together. It focuses on ship anchors rather than small-boat anchor recommendations or permanent offshore mooring systems.
How Ship Anchor Names Fit Together
A catalog may list “Hall anchor,” “stockless anchor” and “HHP anchor” alongside one another. Those labels answer different questions:
| Term | What it tells you | What it does not establish |
|---|---|---|
| Stocked or stockless | Whether the design incorporates a stock, a transverse bar | The anchor's approved holding-power category |
| Hall, Spek or AC-14 | The named anchor design | The exact dimensions or approval status of a particular supplied unit |
| High holding power (HHP) | A performance category with testing and acceptance requirements | That every anchor advertised under a familiar design name has the required approval |
For example, Andy Marine lists its AC-14 as a stockless HHP design. That description identifies the product family; project acceptance still requires the relevant design and product documentation. The distinction between ordinary stockless anchors and approved HHP designs is addressed in IACS Unified Requirement A1, Section A1.4.[1]
Representative Anchor Designs for Commercial Ships
The following designs provide a starting point for understanding commercial ship anchor catalogs. They are not an exhaustive list or a ranking from best to worst.
Hall Anchors
The Hall is a stockless anchor design. Its shank connects to an anchor head with flukes that can pivot relative to the shank. The flukes are the parts intended to engage the seabed.
When reading a Hall anchor listing, look beyond the family name. Andy Marine's Hall anchor range, for example, lists Type A, B and C. The applicable drawing is the reference for identifying the offered version and its dimensions—not a photograph or the word “Hall” alone.
For a foundation-level comparison, the important point is that Hall identifies a design within the stockless group. It does not, by itself, specify every detail needed to replace an existing anchor.
Spek Anchors
Spek is another stockless design. It should be treated as a distinct design family, not as an alternative spelling for Hall or a separate holding-power grade.
Andy Marine's Spek anchor range includes listings named CB711-95, Type M and Type SR. These names make the exact model and drawing important when comparing products. The listing names alone are not enough to conclude that the versions are interchangeable.
A useful comparison with a Hall anchor starts with the actual drawings: the anchor-head shape, overall dimensions and arrangement for recovering and stowing the anchor. Neither design name establishes that an anchor will fit a particular vessel's existing arrangement.
AC-14 Anchors
The AC-14 anchor is listed as a stockless high holding power design. It is a useful example of why “stockless” and “HHP” are not competing descriptions.
Here, AC-14 identifies the design, stockless describes its structure, and HHP describes the performance category being offered.
The distinction matters when reviewing specifications: recognizing the design does not replace checking its approval. IACS UR A1 describes holding-power testing for HHP approval or acceptance; the name on a catalog page is not that test evidence.[1]
Other Names in Anchor Catalogs
Commercial catalogs also contain names such as Pool, Japan Stockless and U.S.N Stockless. Andy Marine lists these alongside Hall, Spek and AC-14 in its marine anchor catalog.
Treat them as directions for further product research, not as proof that every listed design suits the same vessel or duty. Start with the specified design and then examine the corresponding drawing and documentation.
Stocked and Stockless Anchors
The defining difference is the stock: a transverse bar incorporated into a stocked anchor. An Admiralty-pattern anchor is a familiar example of a stocked design, but it should not be used as a complete definition of every stocked anchor.
A stockless anchor has no such bar. In the Hall, Spek and AC-14 designs discussed here, the relationship between the shank and moving anchor head is part of the arrangement used for handling and stowage.
Stockless anchors are central to commercial ship anchoring practice: the cited edition of IACS UR A1 states that ordinary anchors of stockless type are generally to be adopted, subject to the society's rules or practice.[1] That is not a claim that every merchant vessel uses the same design—or that a stockless anchor automatically fits any hawse pipe, the passage through which the anchor cable runs at the bow.
| Structural group | Basic distinction | What to examine next |
|---|---|---|
| Stocked | Incorporates a transverse stock | The particular design and its handling and stowage arrangement |
| Stockless | Does not incorporate a stock | The named design, drawing and fit with the vessel's anchor arrangement |
What Does HHP Mean?
HHP stands for High Holding Power. It is not simply another name for a large anchor, and it is not a description of the anchor's material.
IACS UR A1 distinguishes ordinary stockless anchors, HHP anchors and Super High Holding Power (SHHP) anchors. It sets out comparative holding-power tests for HHP and SHHP approval or acceptance.[1] Those categories should not be read as a universal upgrade ladder: applicable requirements and service restrictions matter.
For this introductory guide, the practical lesson is to keep design recognition separate from approval. If a specification calls for an approved HHP anchor, confirm the applicable documentation and project requirements rather than relying on the product name. Decisions about permitted anchor mass belong in the vessel's applicable rules and approved design, not in a general anchor-types comparison.
From Recognizing the Type to Identifying the Product
Once the terminology is clear, the next step is to identify the actual anchor being discussed:
- Design and version: Is the requirement for a particular Hall, Spek, AC-14 or other design?
- Drawing and dimensions: Which drawing describes the offered anchor and its connection and stowage arrangement?
- Project requirements: What mass, approval and documentation are specified for the vessel?
Matching the design name or mass alone does not establish interchangeability. This guide explains the categories; it is not a vessel-specific selection or replacement approval.
To explore the available designs, browse Andy Marine's marine anchor range. When making an inquiry, include the required anchor type, available drawing and project requirements so the requested product is clearly identified.
Reference
[1] IACS, Unified Requirement A1 — Anchoring Equipment, Rev.7 (2020), Corr.1 (2021), Sections A1.4.1–A1.4.2, pp. 8–9; copy hosted by ABS. This edition is cited for the terminology and approval framework discussed above, not as a determination of the rules applicable to an individual project.
