The 30mm Combination Spanner is a hand tool used to engage and turn 30 mm hexagonal nuts and bolts. It combines an open-end jaw at one end with a boxed (ring) end at the other, allowing rapid operation with the open face and positive, low‑rounding engagement with the ring end; its primary use is for tightening and loosening metric fasteners in confined or general maintenance environments.

This spanner is manufactured from chrome‑vanadium (Cr‑V) steel, drop‑forged and heat‑treated to provide the toughness and tensile strength required for workshop and industrial use. The surface is bright chrome plated and polished to provide corrosion resistance and to make cleaning easier after use. The open end features parallel, machine‑finished jaws to DIN/ISO dimensional tolerances, while the ring end is a 12‑point design with a 15° offset to improve access and allow re‑engagement without removing the tool entirely. Thread type and drive type are not applicable to this hand spanner; it is intended for manual use.

Dimensions and manufacturing conform to commonly applied DIN and ISO standards for combination spanners (typical references: DIN and ISO metric spanner dimensions) and to UK BS equivalents for hand tool sizing and tolerances. The combination of Cr‑V material and heat treatment delivers a robust tool capable of transmitting the torque levels expected in light to heavy maintenance tasks, making it suitable for professional users.

Typical applications include vehicle and plant maintenance, engineering workshops, agricultural machinery servicing, construction equipment work and general industrial maintenance where 30 mm metric fasteners are used. The ring end reduces the risk of rounding vulnerable fastener heads, while the open end permits use where lateral entry is required. The chrome finish offers corrosion protection, and the material/heat treatment combination ensures good fatigue resistance and long working life.

Duchy Fasteners stocks this 30mm Combination Spanner individually and within mixed spanner sets; we hold a broad metric range in single sizes and multi‑pack options to suit toolboxes, site kits and workshop requirements.