Green Pin - Resource Center

Frequently Asked Questions

Are Green Pin_® Turnbuckles suitable for lifting applications?

Green Pin_® Turnbuckles G-6311, G-6312, G-6313, G-6314, G-6315, G-6323 and G-6333 are suitable for lifting applications. These items have a Proof Load equal to 2 x WLL and Minimum Breaking Load equals to 5x WLL. Of course the “Instructions for use”, as we publish them in our catalogue should be respected at all times.

Note: It is not permitted to adjust the length of the turnbuckle under full load. Tensioning below the WLL is permitted. It is advisable first to adjust roughly the length of the turnbuckle and then load the turnbuckles to a certain tension. The tension may not exceed the full capacity (WLL).

Note: that it is not permitted to lift a load by tensioning (rotating the body) the turnbuckle, as shown in the picture below:

Do not rotate turnbuckle body when lifting

FAQ-Reference PI-02-01. Revision B.

Does the screw thread on a Green Pin_® Shackles with a screw collar damage counter components such as wire rope?

We have realized a small modification of Green Pin_® shackles (WLL≥2t) with screw collar pins. In an earlier design, after assembly some of the threading is visible at the shackle eye:

In the current design, hardly or no thread is visible at the shackle eye. We realized this by making a small “chamber” in the shackle eye. The advantage of the new design is reduced wear of counter components like, wire rope, chain, rope and or synthetic web slings and their fittings.

FAQ-Reference: PI-02-02. Rev: 0.

Are Green Pin Tycan_® chains resistant to chemicals?

Green Pin Tycan_® chains are made from 100% Dyneema_® UHMWPE fibers which are very resistant against chemicals and thus have a negligible impact on the lifting capacity or functionality. The fibers are highly crystalline and do not contain any chemical groups such as aromatic rings, amide, hydroxyl or others which are susceptible to attack by aggressive agents. UHMWPE fibers do not swell, hydrolyze or otherwise degrade in water, seawater or moisture. Properties such as tension, fatigue, yarn on yarn abrasion and bending fatigue may improve through contact with water. This is attributed to the cooling or lubricating effect of the water. The chemical resistance has been analyzed using loss of tensile strength as the key indicator. To classify the impact of chemicals the following categories are being used. The tables below offers a general guideline only. The material must always be tested for your specific conditions.

Green Pin Tycan Chains Checmical Resistance

Green Pin Tycan Chains Chemical Resistance

FAQ-Reference: PI-02-07. Rev: A.

Are there any recommendations for the inspection of shackles?

It is required that shackles are regularly inspected and that the inspection should take place in accordance with the safety standards given in the country of use. This is required because the products in use may be affected by wear, misuse, overloading etc. with a consequence of deformation and alteration of the material structure. Inspection should take place at least every six months and even more frequently when the shackles are used in severe operating conditions.

Shackles should be inspected to ensure that:

all markings are legible;
the body and pin are both identifiable as being of the same size, type and make;
the threads of the pin and the body are undamaged;
for a safety bolt type shackle is used with the split cotter pin;
the body and the pin are not distorted or unduly worn;
the body and pin are free from nicks, gouges, cracks and corrosion;
shackles are not heat treated as this may affect their Working Load Limit;
the shackle is not modified, repaired or reshaped by welding, heating, machining or bending as this will affect the Working Load Limit;

Remove the shackle from service if:

all markings are not clearly legible;
body and pin can not be identified as being from same size, type and make;
the threads of the pin and/or body are damaged;
for a safety bolt type shackle the split cotter pin is missing;
the body and/or pin is distorted or unduly worn, the maximum allowable wear is 10% of the original dimension;
the body and/or pin is not free from nicks, gouges, cracks or corrosion;
the shackle has been exposed to any heat treatment;
the shackle is modified, repaired or reshaped by welding, heating, machining or bending;
t is expected that before the next periodical inspection any of the inspection criteria above will not be passed;

FAQ-Reference: PI-06-01. Rev: 0.

Are there any recommendations for additional stamping on Green Pin_® Shackles?

Note: Main dimensions, general info and warnings can be found in our latest catalogue.

If the recommendations in this product information are followed performance of the shackles is guaranteed:

permanent identification marks, or symbols, are to be made by dot peen marking or with stamps having rounded profiles (low stress stamps).
the number of marks on a shackle is to be kept to the minimum.
the use of fractions and oblique strokes is to be avoided and a dot or hyphen is preferable to a dividing line.
values of WLL are, generally, to be marked to one place of decimals (except for 0.25 and 0.75) up to 100 t and in integers thereafter. The word “tonnes” may be abbreviated to “t”.
recommended sizes of marks are
- Diameter of part to be marked > recommended size of mark
- less then 12.5 mm > 3.0 mm
- 12.5 to 26 mm > 4.5 mm
- over 26 mm > 6.0 mm

Typical arrangements of marks can be found in the following illustrations.

Additional stamping on Green Pin® Shackles 1

Additional stamping on Green Pin® Shackles 2

Additional stamping on Green Pin® Shackles 3

FAQ-Reference: PI-05-03. Rev 0.

Is it allowed to weld on Green Pin_® lifting equipment?

No! Green Pin_® products are treated with well designed heat treatment, which results in a certain Minimum Break Load and other specific mechanical properties. These properties will be destroyed by the heat of welding. It even can initiate extreme hard spots and initial cracks, that will decrease the strength and fatigue life dramatically. An exception is made for Green Pin_® GH and PAS products, as these need to be welded to a surface to function. For these items, please follow the instructions that are available at Green Pin_® sales.

FAQ-Reference PI-07-02.

How do I design a sling?

Green Pin_® is a sponsor of sling design program 'SlingPro' developed by Engineering Spreadsheets UK. Click here to download this program.

How should I use the Green Pin_® Guided Pin ROV Shackle?