FIX SPANNER

Product Specification :

A Fixed Spanner, specifically the Open-Ended Spanner, is a non-adjustable hand tool designed to fit a specific size of nut or bolt head. Unlike adjustable wrenches, fixed spanners provide a precise, snug fit that minimizes the risk of slipping or damaging fasteners.

1. General Characteristics

• Design: Features a U-shaped opening that grips two opposite parallel faces of a fastener.
• Configuration: * Single-Ended: One head of a specific size.
  • Double-Ended: Two heads, usually of consecutive or common sizes (e.g., 10mm and 11mm).
• Jaw Angle: Most heads are set at a 15° angle to the longitudinal axis. This allows the wrench to be flipped over to provide a different angle of attack in tight spaces.

2. Material & Construction

3. Standards & Tolerances

Fixed spanners are built to strict global standards to ensure they don't "round off" bolts:

• ISO 10102 / DIN 3110: Governs the dimensions and torque requirements for double-headed open-ended wrenches.
• Tolerance: The opening is slightly larger than the nominal size (e.g., a 10mm spanner is actually ~10.05mm) to allow for easy fitting, but must stay within tight limits defined by ISO 691.
• Proof Torque: Must withstand specific force levels without permanent deformation of the jaws.

4. Comparison: Fixed vs. Adjustable

5. Common Sizes

• Metric: 6mm, 8mm, 10mm, 12mm, 13mm, 17mm, and 19mm are the most common in sets.
• Imperial (SAE): 1/4", 3/8", 1/2", 9/16", 5/8", and 3/4".