Rawhide and Sinew Processing: Animal-Based Cordage and Binding

The Case for Animal-Based Binding Materials

Sinew and rawhide are among the strongest natural binding materials available anywhere in nature. A lash of wet rawhide around a tool head will shrink rock-hard as it dries, creating a grip that does not loosen and requires no glue. Sinew thread is flexible enough for fine sewing, strong enough for bowstrings, and easy to source from any large game animal.

These skills are an investment. They take practice to do well and require having game animals to process — which means they belong in a larger hunting and trapping skillset. But the materials are literally sitting in every deer you harvest.

Rawhide Processing

Step 1: Remove the Hide

Skin the animal as cleanly as possible. Any meat left on the hide speeds putrefaction and attracts insects during drying. Work your blade flat against the inner hide surface, scraping rather than cutting.

Step 2: Remove the Hair

Fresh (green) hide is easiest to work. You have two options:

Scraping method: Stretch the fresh hide over a log or wooden frame. Use a dull-edged bone, smooth stone, or the back of a knife blade to scrape the hair from the outer surface. Use pressure and push from root to tip. This takes 1-3 hours for a deer hide.

Bucking method (easier but requires ash): Make lye water by soaking wood ash in water for several days (the water turns slippery and caustic). Soak the hide in lye water for 1-3 days. The hair slides off with minimal scraping. Rinse thoroughly with clean water after deharing.

Step 3: Flesh the Hide

Scrape the inner surface to remove all fat and membrane. A fleshing beam (a smooth, slightly rounded log) helps — drape the hide over it and scrape with a bone flesher or dull blade. Work from the center outward.

Step 4: Dry the Rawhide

Lace or stake the hide on a frame (lash a rectangular frame from poles). The hide shrinks considerably as it dries — lace it under tension. Keep it in shade or covered to prevent direct sun from cracking it.

Dry time: 24-48 hours in warm, dry conditions. The hide should become stiff and translucent when fully dry.

Using Rawhide

Cut dry rawhide into strips with a sharp knife. Widths from 1/4 inch to 1 inch work for most binding applications. Soak strips in water for 15-30 minutes before using — wet rawhide is pliable and can be wrapped tightly. As it dries on the tool or joint, it shrinks to a rock-hard binding that does not loosen.

Applications: hafting stone tool heads, binding axe heads to handles, wrapping knife handles, creating containers (boiled rawhide can be shaped when wet), making drum heads.

Sinew Processing

Backstrap Sinew

The backstrap sinew (lumbar fascia) runs on either side of the spine from the shoulder to the hip. It is a flat, white, pearlescent band approximately 1-2 inches wide on a deer.

Leg Tendon Sinew

The large leg tendons (particularly the Achilles tendon) provide thicker, stronger sinew usable for bowstrings and heavy binding.

1. Remove the lower leg by cutting the joint
2. Skin the lower leg
3. The tendons are clearly visible running along the back of the leg
4. Remove by cutting at the joint attachment and peeling free
5. Pound the tendon with a smooth rock until it flattens and the fibers separate
6. Allow to dry, then split into strands

Using Sinew

As thread: Wet sinew slides through a bone awl hole or needle hole easily. Dry sinew is too stiff to thread. Work with wet sinew and allow it to dry in place — it shrinks and tightens the seam.

As cordage: Twist multiple strips together using the reverse-wrap technique (see two-ply-twist-cordage.mdx). Sinew cordage is among the strongest natural materials available.

As bowstring material: Traditional bowstrings from sinew were twisted into a cable-lay string, typically 3-ply. See bow-arrow-primitive.mdx for details on this process.

Tool hafting: Apply wet sinew to bind a stone or bone tool head to a handle. Wrap tightly, then apply pine pitch over the sinew as additional adhesive. When dry, the assembly is rigid.