12 May 2026 · 6 min read

Saddle stitch spacing: a complete guide for leather makers

Choosing the right stitch spacing is one of those decisions that separates clean leather work from amateur-looking work. Too close and your stitches look crowded and weak; too far and they look loose and unprofessional. There's no single correct spacing — it depends on the leather, the project, and your tools.

This guide covers the practical numbers: what spacing to pick, how SPI translates to millimeters, and how to avoid the corner problem that trips up beginners.

What is stitch pitch?

Stitch pitch is the distance between consecutive stitch holes. It's measured two ways depending on where you learned the craft:

SPI (stitches per inch) — the American convention. Common pitches are 4, 5, 6, 7, 8, and 9 SPI. Lower numbers mean wider spacing.

Millimeters — the European convention, and what most modern leather tools and pattern software use. Common values: 2.5, 3, 3.5, 4, 5, 6 mm.

Here's a quick conversion:

The conversion is just 25.4 ÷ SPI. So 7 SPI = 25.4 / 7 = 3.63 mm.

Choosing pitch for the material

The general rule: thicker leather, wider spacing. Thinner leather, tighter spacing.

• 0.6–1.2 mm leather (lining, light wallets): 2.5–3 mm spacing (8–9 SPI). Tight stitching keeps the seam from gaping.
• 1.2–2 mm leather (wallets, card cases, watch straps): 3–4 mm spacing (6–8 SPI). The most common range for fine work.
• 2–3 mm leather (small bags, sheaths): 4–5 mm spacing (5–6 SPI). Bigger holes don't weaken thicker material.
• 3 mm+ leather (belts, holsters, heavy bags): 5–6 mm spacing (4–5 SPI). Wider pitch suits heavy thread.

These are starting points, not rules. The other big factor is thread thickness — heavier thread (Tiger 0.8 mm, Linen 532) needs wider pitch to clear cleanly through the holes.

The corner problem

Straight runs are easy. Corners are where amateur work shows.

If you place stitches at fixed 3.5 mm spacing around the perimeter of a wallet, the last stitch before each corner will rarely land at exactly 3.5 mm from the corner itself. You end up with stitches that look right on the straight, then visibly compress or stretch near each corner.

There are two strategies professional makers use:

Walking the stitches — start at one corner and place every hole at exact pitch. Accept that the final stitch before the next corner may be at an awkward distance. Best for asymmetric designs where one start point is naturally hidden (under the flap, on the back).

Balancing the stitches — slightly adjust the spacing along each side so that every side starts and ends with a hole exactly at the corner. The math: side length ÷ ideal pitch, round to nearest integer for number of stitches, divide side length by that integer for actual pitch. Each side gets a small adjustment.

Balanced stitching is what most pattern software does by default. It looks clean and symmetric. The trade-off: spacing varies by 0.1–0.3 mm between sides, which is invisible in practice.

Marking the holes

Once you have your spacing, you need to actually punch the holes. Three options:

Pricking irons — traditional. Mark the holes with an iron, then open with an awl. Slow, beautiful, expensive (Vergez Blanchard or Kevin Lee irons are €100+ each).

Pricking chisels — modern. Punch directly through the leather. Faster than irons, less skill required. Good ones (Crimson Hides, Amy Roke) are €40–€80 per chisel.

Printed pattern + rotary punch — pragmatic. Print the pattern with holes marked, transfer the holes to the leather with an awl, then open with a 1.5 mm rotary punch. Best for production work; less traditional but very accurate, especially on curved seams where chisels can't follow the curve precisely.

Common mistakes

A few traps to avoid:

• Mixing pitch on the same project. All visible seams should use the same pitch. Internal seams can differ.
• Forgetting the awl angle. Pricking irons leave slanted holes (typically 30°). For saddle stitch, all holes should slant the same direction on the same face.
• Punching too close to the edge. Stitch line should sit 3–5 mm in from the cut edge — closer than that, the leather will tear under thread tension.
• Inconsistent corner treatment. Pick walking or balancing for the whole piece, not a mix.

In EasyPatt

To generate stitch holes in EasyPatt, draw your panel, then activate the Stitch tool and click any edge. Set the spacing (mm), the offset from the cut edge, and the mode (walking or balancing). Holes are recalculated every time you adjust the panel, so the spacing stays correct through edits.