Awl
What is an Awl?
An awl is not a material, but rather the most essential artisanal tool in quality leatherworking. It is a tapered rod, typically forged from hardened steel or made from animal bone, characterized by a very sharp point and an ergonomic handle made of solid wood or metal. This tool represents the core of medieval European leather manufacturing, documented in rope makers' and leatherworkers' workshops from the 14th century onwards.
The awl is used to pierce leather with millimeter precision, preparing the holes necessary for hand stitching — the very stitching that characterizes artisanal watch straps and genuine leather products. Unlike industrial mechanical drilling, the awl allows the master craftsman to adapt the width and angle of each hole to the specific body of the leather, respecting the natural variability of the grain and fiber density.
The distinction between an awl and similar tools is relevant: unlike a punch (which is stouter and used for marking), the awl has a progressive taper that minimizes fiber tearing during penetration. In Italy, especially in the Milanese and Tuscan traditions, the most refined awls are handcrafted by specialist toolmakers, often with molybdenum steel points that maintain their sharpness through hundreds of consecutive piercings.
Features and Properties
The properties of the awl directly determine the quality of the final stitching in watch straps and leather goods:
| Property | Technical Specifications | Impact on Craftsmanship |
|---|---|---|
| Point | Taper 0.5-1.5 mm, sharpening at 45-60° | Reduces tearing of collagen fibers; more even stitching |
| Steel | Rockwell Hardness 58-62 HRC (if tempered) | Maintains sharpness for 500+ piercings; resistant to dense vegetable-tanned leather |
| Shaft Length | 120-180 mm total; point 60-90 mm | Allows optimal biomechanical leverage; reduces artisan fatigue |
| Handle | Ash or maple wood; diameter 18-25 mm | Thermal insulation; ergonomics during 4-8 hours of daily work |
| Weight | 35-55 grams | Balance between stability and maneuverability in precise movements |
The quality of an awl is recognized by the regularity of its taper and the absence of micro-scratches on the tip. An awl used for decades, if properly tempered, develops an oxide patina that communicates experience and reliability to the finished piece. Milanese artisans often personalize the wooden handle with engraved initials, transforming the tool into a seal of their mastery.
Use in Watch Straps
In handcrafted watch straps, the awl plays an invisible but crucial role. When the master creates a vegetable-tanned strap — whether from shoulder calf leather, aged Italian vachetta, or natural suede — they use the awl to prepare the holes for saddle stitching, the technique that guarantees maximum strength and longevity of the product.
The precision of awl piercing is particularly critical in thin straps (2.5-3 mm of solid leather) intended for elegant watches, where the distance between the holes must exactly match the length of the waxed linen thread's stitch (usually 3-4 mm). A half-millimeter error produces asymmetrical stitching visible through the side of the strap — a defect that the eye of a quality watch collector immediately recognizes.
For straps intended for sports watches (Submariner, GMT-Master, Sea-Dweller) or vintage watches (steel Daytona), the awl is used to make the lug anchor holes, ensuring that the coarse-grained leather does not tear when subjected to the stresses of a 40-42 mm watch. In straps with a deployant clasp, the holes made with an awl allow for the secure attachment of bronze or steel anchor buttons.
Milano Straps produces straps where each hole is made with an awl, both in vegetable-tanned models and in exotic leather (alligator, crocodile) ones. This choice allows for artisanal control over the stitch density and the distribution of thread weight on the leather fibers, results impossible to achieve with industrial punch presses.
Maintenance and Care
Despite being an ancient tool, the awl requires specific maintenance to preserve its effectiveness. A well-maintained awl lasts for decades:
Cleaning: After each work session, the tip should be cleaned with a dry cotton cloth and diluted white vinegar (1:3) to remove collagen and tanning residues. Surface oxidation of the steel should not be completely removed — a slight gray patina protects against further oxidation.
Sharpening: A properly tempered awl does not require frequent sharpening. If the tip starts to push fibers instead of cutting them, sharpen it on a 4000-8000 grit stone with controlled movement and a constant 45° angle. Sharpening is a delicate operation that requires experience: an over-sharpened awl becomes brittle and dulls easily on dense vegetable-tanned leathers.
Storage: Store the awl in a fabric or leather case, in a dry environment. Humidity causes deep oxidation of the steel and swelling of the wooden handle. Avoid contact with other metal tools (in a shared drawer with hammers, knives) that can cause dents on the tip.
Temperature: High temperatures (above 40°C) can compromise the steel's temper, reducing its hardness. Store at a stable room temperature.
In our Casati Milano atelier, the historic awls used for apprentice training date back to the 1950s and still maintain very sharp points thanks to constant care and conscious use.
Frequently Asked Questions about Awls
An awl has a progressive taper and a very sharp point designed to pierce leather without tearing fibers; a punch is stouter, with a rounded tip, and is used to mark reference points without fully penetrating the material. The awl cuts, the punch marks. Only an awl is used for quality stitching.
A quality artisanal awl features: a symmetrical tip without micro-scratches; steel with visible hardness (does not rust easily in normal humidity); a perfectly balanced handle that does not slip in the hand during 3-4 hours of continuous work; origin from specialized forgers (German Pfeil, Italian Carrera, French Le Gout are reliable historical brands). The price of an authentic artisanal awl is 25-50 euros; beware of awls under 10 euros.
Awl piercing allows for precise control of the depth and angle of each hole, essential for symmetrical saddle stitching on leathers of varying density. Furthermore, the awl does not compress the collagen fibers like a punch press would; the result is stitching that, along its length, shows the best adhesion between linen thread and substrate. In our straps, the millimeter precision of the awl guarantees longevity beyond 30 years of daily use.
Yes, but with different precautions. On dense vegetable-tanned leathers (Italian vachetta, aged Veg Tan), the awl penetrates with less resistance and allows for precise holes. On softer chrome-tanned leathers (like some shoulder calf leathers), the awl may slightly compress the fibers around the hole; in these cases, the artisan slows down the movement and uses gentler pressure. On exotic leathers (alligator, crocodile), the awl must be sharper and tempered to a higher hardness, as the scales offer greater resistance than traditional fibers.
An awl tempered to Rockwell hardness 58-62 HRC, used daily on vegetable-tanned leather, maintains optimal sharpness for 400-600 piercings (approximately 2-3 weeks of full-time artisanal work). Beyond this threshold, the tip begins to slightly push fibers instead of cutting them: a sign to have the awl professionally sharpened. With proper maintenance, the same awl remains effective for decades, sharpened 30-40 times in its lifespan.
Discover Milano Straps watch straps made with awl stitching — each hole handcrafted according to the rigor of the Milanese artisanal tradition, with shipping in 48 hours throughout Italy. For a custom strap, tailored to the anatomy of your wrist and watch, visit the Casati Milano atelier at Via XX Settembre 15, Milan — by appointment.