Semperfli Pure Silk Fly Tying Thread – Blue No. 7 | Durable, Flat-Lay Silk for Salmon & Clyde Flies

Timeless silk, modern performance

Silk thread has long been a staple for fly tiers who value a natural sheen, supple handling, and a smooth wrap. Semperfli Pure Silk Fly Tying Thread in blue No. 7 blends that heritage with contemporary design, delivering a faithful color match that aligns with Edmonds and Lee's Brook & River Trouting references. The result is a blue shade that looks right in hand and on the water, helping you realize the subtle hues and contrasts your patterns call for.

Crafted as a twisted silk, this thread can be gently untwisted to lay perfectly flat on the hook. That flat lay makes it easier to build precise bodies, neat collars, and clean head wraps without added bulk, while preserving a crisp, progressive wrap that reads well in photos and under field light.

Key benefits

• Twisted silk that can be untwisted to lay flat for tidy wraps
• Approximately 250 denier provides a balanced body and tie-down strength
• Stronger for tying than traditional flat silks, reducing wear at wraps
• Durable material designed for repeated handling during tying sessions
• Ideal for salmon patterns, North Country and Clyde style flies

Best uses and patterns

This blue No. 7 thread is versatile for classic and regionally inspired patterns. It excels in salmon flies, and works well with North Country spiders and Clyde-style constructions, where a glossy, controlled thread finish complements ribbing, body forms, and wing cases.

• Salmon flies and other heavy-bodied patterns needing secure wraps
• North Country spider patterns that benefit from a crisp, glossy thread
• Clyde-style flies where color fidelity and smooth lays matter

How to use

To achieve a flat lay, gently untwist the thread as you wrap and maintain steady tension. Work in a clean, contained workspace to reduce fray and tangling. When finished, allow wraps to settle before trimming and finishing the thread.

Color fidelity and inspiration

The blue No. 7 shade is chosen to complement traditional pattern palettes, helping you build a cohesive look across body, rib, and wing components under varied light on stream and riverbank.

Care and storage

Store on the original spool in a cool, dry place away from direct sunlight. Gentle handling helps preserve the thread’s luster and strength for longer tying sessions.