Do You Have to Cast the Thread When Saddle Stitching?

Do You Have to Cast the Thread When Saddle Stitching?

If you’re learning to saddle stitch leather, you’ve probably come across the term “casting” or “casting the thread”.

But is casting actually necessary? Do you have to cast the thread every time you saddle stitch leather?

No — you don't have to cast the thread to saddle stitch leather.

Casting is a technique used by many leatherworkers to control the position of the thread as each stitch is made. It can help produce the characteristic, neat and consistent appearance associated with traditional hand-stitched leatherwork, but a saddle stitch can also be made without casting.

Understanding when and why to cast can help you decide which technique works best for your project.

What is casting the thread?

In leather stitching, casting means deliberately looping or positioning the thread around the needle or the thread coming through the stitching hole before pulling the stitch tight.

The cast effectively helps determine where the thread sits within the hole and can influence the direction and appearance of the finished stitch.

It is particularly associated with traditional saddle stitching, where consistency of the thread's position is important.

Rather than simply passing one needle through the hole and then the other, the stitcher uses the cast to control the thread as the second needle is introduced.

The result can be a more pronounced and consistent diagonal stitch pattern on both sides of the leather.

Do you need to cast when saddle stitching?

No.

Casting is not an essential part of the basic saddle stitch.

The fundamental saddle stitch is made by passing two needles, attached to opposite ends of one length of thread, through the same holes from opposite sides. The threads cross within the hole, creating the characteristic hand-stitched seam.

You can therefore produce a perfectly functional saddle stitch without deliberately casting the thread.

However, there is an important distinction between making a saddle stitch and controlling exactly how that saddle stitch looks.

Casting gives you greater control over the thread's position and can make it easier to achieve a consistent appearance from stitch to stitch.

Why do leatherworkers cast their thread?

The main reason to cast isn't necessarily strength.

It is primarily about control, consistency and appearance.

When you cast the thread, you are deliberately controlling which side of the thread sits where as the stitch is tightened. This can help create the familiar angled or zig-zag appearance of traditional saddle stitching.

It can also make the front and back of the finished seam look more consistent.

Some leatherworkers find casting particularly useful when working with thicker leather, where controlling the thread inside a larger stitching hole can be more difficult.

Does casting make a saddle stitch stronger?

Not necessarily.

Casting is generally better thought of as a technique for controlling the appearance and positioning of the thread, rather than a way of fundamentally increasing the strength of the saddle stitch.

A properly executed saddle stitch without casting can still produce a strong, durable seam.

The strength of your stitching is influenced by many other factors, including:

• The quality and type of thread
• Thread thickness
• Leather thickness
• Stitch spacing
• Hole size and shape
• Thread tension
• The quality of the leather
• How the beginning and end of the seam are secured

So if you've been worrying that you're doing your saddle stitching “wrong” because you don't cast, there's no need to panic.

Casting is a technique, not a requirement.

Casting vs not casting: what's the difference?

The easiest way to understand the difference is to think about thread placement.

Saddle stitching without casting

Without casting, you concentrate on passing the needles through the holes correctly and maintaining consistent tension.

This can produce a perfectly good saddle stitch.

However, the thread can have a little more freedom to move within the hole, meaning the final stitch pattern may be less deliberately controlled.

Saddle stitching with casting

With casting, you deliberately loop or position the thread as you make each stitch.

This gives you greater control over where the thread sits and can produce a more consistent diagonal pattern.

For leatherworkers aiming for a highly controlled, traditional appearance, this can be an important part of their technique.

Does casting affect the appearance of the stitch?

Yes — this is where casting can make a noticeable difference.

The way the thread is positioned as the stitch is tightened affects the angle and appearance of the finished stitching.

A consistent cast can help produce the clean, regular stitch pattern that many leatherworkers associate with high-quality hand stitching.

This is especially noticeable on the back of the leather, where thread positioning can otherwise be less predictable.

However, casting is only one part of achieving consistent stitching.

Your:

• Hole angle
• Stitch spacing
• Thread tension
• Needle sequence
• Thread thickness
• Leather thickness

all contribute to the final appearance.

Do you need to cast on every stitch?

If you choose to use a casting technique, consistency is more important than simply doing it because you've been told you have to.

Changing your technique halfway through a stitch line can produce visible differences in the angle or position of the thread.

If you are aiming for a particular appearance, practise the technique until you can repeat the same movement and tension from one stitch to the next.

Like most leathercraft techniques, this becomes much easier with practice.

What about thick leather?

Casting can be particularly useful when stitching thicker leather.

With more material between the two faces of the project, there is more space inside the stitching hole for the thread to move.

A deliberate cast can help keep the thread in the desired position.

Some experienced leatherworkers therefore use casting as a way of maintaining control when working on heavier leather or when they want a particularly consistent stitch pattern.

That doesn't mean casting suddenly becomes compulsory for thick leather — it simply becomes another useful technique in your toolbox.

What is the best way to learn saddle stitching?

If you're new to leather stitching, we recommend learning the basic saddle stitch first, rather than trying to master every variation at once.

Start by concentrating on:

1. Consistent hole spacing
2. Correct needle placement
3. Keeping the thread from tangling
4. Even tension
5. Consistent stitch direction
6. Finishing the seam securely

Once you're comfortable with these fundamentals, introduce casting and see how it changes the appearance of your stitching.

Our guide to how to saddle stitch leather by hand covers the basic technique and the tools you'll need.

What thread should you use for saddle stitching?

The choice of thread can make a significant difference to how easy your stitching is to control.

For traditional leatherwork, waxed linen thread is a popular choice. Wax helps bind the fibres together, reduces fraying and makes the thread easier to handle.

Waxed polyester is another popular option, particularly when durability and abrasion resistance are priorities. British Leather Supplies stocks a range of linen and polyester leather stitching threads in different thicknesses.

When choosing your thread, consider the relationship between:

Thread thickness + stitch spacing + leather thickness

A very thick thread in a small stitching hole can be difficult to manipulate, while a very fine thread may not give the appearance you're looking for.

What about backstitching?

Casting shouldn't be confused with backstitching.

Backstitching is a way of securing the beginning or end of a seam by stitching back through previously completed holes.

For example, two or three backstitches are commonly used at the end of a saddle-stitched seam.

Casting, on the other hand, is about how the thread is positioned during an individual stitch.

They are two different techniques with different purposes.

So, should you cast your thread?

If you're wondering whether you have to cast your thread when saddle stitching, the simple answer is:

No.

You can saddle stitch perfectly well without casting.

However, casting can be a useful technique if you want greater control over the appearance and position of your thread, particularly when you're aiming for a consistent traditional stitch pattern.

Rather than thinking of casting as a rule that must always be followed, think of it as another technique available to you as you develop your leatherworking skills.

Try stitching a few lines both ways.

Compare the front and back.

Look at the angle of the stitches.

Then decide which result you prefer.

That's one of the enjoyable parts of learning leathercraft — there is often more than one way to achieve a good result.

Frequently Asked Questions

Is casting necessary for saddle stitching?

No. Casting is not necessary to create a saddle stitch. It is a technique used to control the position and appearance of the thread as each stitch is made.

Does casting make leather stitching stronger?

Casting is primarily about thread positioning and appearance rather than fundamentally increasing the strength of the seam. Stitch construction, thread, leather, hole preparation and tension all contribute to strength.

What does casting mean in leather stitching?

Casting means deliberately looping or positioning the thread around the needle or another section of thread as part of making the stitch. It helps control where the thread sits within the stitching hole.

Why do my saddle stitches look different on the front and back?

Differences between the front and back can result from thread positioning, hole angle, needle sequence and tension. Casting can help control thread placement and create a more consistent appearance on both sides.

Can beginners saddle stitch without casting?

Absolutely. For beginners, it can be useful to learn the basic two-needle saddle stitch first and then experiment with casting once the fundamental technique feels comfortable.

What is the difference between casting and backstitching?

Casting controls the position of the thread during individual stitches. Backstitching involves stitching back through completed holes to help secure the beginning or end of a seam.

Final thoughts

There is no single rule that says every saddle stitch must be cast.

Casting is a technique, not a requirement.

If you're happy with the appearance of your stitching without casting, there's nothing inherently wrong with that. If you want more control over the direction and consistency of your stitches, learning to cast is well worth adding to your leatherworking toolkit.

As with so many aspects of leathercraft, the best way to understand the difference is to try both techniques and see the results for yourself.

For more leathercraft advice, guides and hand-stitching supplies, explore the British Leather Supplies Leathercraft Guides & Advice and our range of Leather Stitching Thread.