This M20 x 85 mm perforated sleeve is an accessory for injection‑resin (chemical) anchor installations, designed to accept a 16 mm stud. It is used where a resin plug is injected into a drilled hole and a perforated sleeve provides a mechanical casing that retains resin, promotes controlled resin flow and ensures a secure bond between the resin, the base material and the M16 stud. The primary use case is heavy duty fixings into concrete, masonry and hollow blockwork where a reliable resin anchor is required.

The sleeve is supplied in steel with a zinc plated finish as standard, with stainless options (A2 / 304 and A4 / 316) available for corrosive or marine environments. Typical material grades are mild steel to grade 4.6 or stainless to BS EN 10088. The product is manufactured to suit metric coarse threads in accordance with ISO metric thread standards (ISO 261 / ISO 724); it is intended to take an M16 stud (standard M16 coarse pitch thread) and mates with standard M16 hexagon nuts and washers (e.g. ISO 4032 / ISO 7090). Where plating is applied, coatings meet electroplating requirements to BS EN ISO 4042. Selection and installation should follow guidance in BS 8539 for post‑installed anchors in concrete and relevant product data for the chosen injection resin system.

Typical applications include structural and non‑structural anchorages such as base plates, handrails, balustrades, façade fixings, mechanical equipment and safety barriers. Industries that commonly use perforated sleeves with injection resin include construction and civil engineering, utilities and plant installation, rail and transport infrastructure, and offshore or coastal projects when stainless sleeves are specified.

Key benefits of the perforated sleeve design are improved resin distribution and interlock through the perforations, increased pull‑out resistance compared with plain sleeves in many substrates, prevention of stud rotation during tightening and compatibility with a wide range of resin chemistries. Choosing stainless options provides enhanced corrosion resistance for aggressive environments while steel/zinc finishes offer cost‑effective performance for internal or sheltered locations.

Duchy Fasteners stocks the M20 x 85 perforated sleeve for 16 mm studs and can supply alternative materials, lengths and pack quantities to suit site requirements; contact our sales team for availability and trade pack options. Reference: RCPS20085.