Membrane cable grommet (diaphragm) | for M9–M120 holes | for cable Ø2–100 mm | grey | IP65 | HT HSS

Membrane cable grommet (diaphragm) | for M9–M120 holes | for cable Ø2–100 mm | grey | IP65 | HT HSS

HSS is a membrane cable grommet (diaphragm) by HT Hi Tech Polymers (Finland), made of halogen-free TPE-SEBS. It is pressed into a round hole in the enclosure, and the membrane is pierced or cut to suit the cable. 11 sizes for holes from Ø9 to Ø120 mm and cables from Ø2 to Ø100 mm.

Key point:
The grommet seals without a thread or nut – a round hole of the right size is enough. Three numbers matter when choosing: the hole Ø (the number after M), the outer cable Ø and the enclosure wall thickness. The range shown in the variant selector (e.g. 1.5–4.5 mm) is the wall thickness, not the cable Ø – the cable Ø is given in the table next to each code.

What does the HT HSS grommet give you?
It closes and seals a cable hole without a thread, nut or tools. A quick solution in panels and boxes where the hole is already drilled and the wall is thin – from 1.0 mm (HSS-M9) to 6.0 mm (HSS-M100, HSS-M120).

• Seals without thread or nut – a round hole is enough
• 11 sizes – for Ø9–120 mm holes and Ø2–100 mm cables
• Membrane to suit the cable – pierced or cut on site
• IP65 – for sizes HSS-M9…HSS-M60
• Halogen-free TPE-SEBS – for −40…+130 °C
• For thin and thicker walls – 1.0 to 6.0 mm depending on size

• Cable entries through the bottom or side of distribution and automation panels
• Junction and distribution boxes with drilled holes
• Control enclosures of ventilation and HVAC units
• Control cabinets in pump stations and boiler rooms
• Machine housings and control pendants
• Lighting control boxes
• Entries of large power cables into cabinets (HSS-M100, HSS-M120)

If the box wall already has a Ø20 mm hole and a Ø11 mm cable has to go in, choose HSS-M20 (hole Ø20 mm, cable Ø7–12 mm, wall 1.5–4.5 mm), press it in, pierce the membrane slightly smaller than Ø11 mm, pull the cable through and fix it inside the box.

• Drill holes and lead in cables only with the power disconnected
• Remove chips and burrs after drilling – a sharp edge can cut the grommet
• The hole Ø must match the number after M and the wall thickness must be within the stated range
• Pierce or cut the membrane slightly smaller than the cable Ø
• Fix the cable inside the enclosure
• The grommet is not a fire barrier

Quick selection guide

What does 1.5–4.5 mm in the variant selector mean – is it the cable Ø?
No – it is the enclosure wall thickness the grommet fits; the cable Ø is given in the table next to each code (e.g. HSS-M20 – Ø7–12 mm).

What does the number after M mean?
It is the mounting hole Ø in the enclosure in millimetres: HSS-M20 is for a Ø20 mm hole, HSS-M120 for a Ø120 mm hole.

What is the IP rating?
According to the manufacturer IP65, while the largest sizes HSS-M100 and HSS-M120 are IP54.

Can several cables go through one grommet?
No, one grommet is for one cable; for several cables use several grommets or a membrane cable entry plate such as HTC-50.

Does the grommet hold the cable against pull-out?
No, fix the cable inside the enclosure or choose a PG cable gland with nut.

What is the material and operating temperature?
Halogen-free TPE-SEBS, operating temperature −40…+130 °C.

Manufacturer documents

• Series datasheet (PDF) – HSS
• Manufacturer catalogue (PDF) – HT Hi Tech Polymers

Links open on external websites. Checked 2026-10-04. If data differ, the latest manufacturer edition applies – or contact us.

HT HSS membrane cable grommet, grey, IP65

Grey HT HSS membrane cable grommets in TPE-SEBS – 11 sizes for Ø9–120 mm holes and Ø2–100 mm cables, IP65. Choose by the hole (number after M), cable Ø and wall thickness.