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Polypropylene Threaded Special Purpose Seals

 (6 product groups)

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Diamond Knurled Knobs

Diamond Knurled Knobs have rough ridges around the outside of the handle creating a firm gripping surface that is also comfortable. These durable knobs fit onto threaded applications and are resistant to oils, fuels, and greases.

Round Threaded Inserts

Round threaded inserts are available as quick-fit inserts for tube ends and connecting pipes. They are threaded for secure screw fixing. These threaded inserts provide a stable and secure mounting point for a wide range of furniture and equipment components.

They are commonly used in the manufacturing, packaging and construction industries.

  • Material: HDPE, Nylon, PA, Steel, PP, LDPE, Aluminium, PE
  • Colour: Black, Natural, Grey


Series Code :SR1570, SR1430, SR1567

Security Seals

Our Security Seals provide a tamper evident seal for plastic containers, while also adding a level of security protection against theft and contamination.

Ideal for use on storage and shopping containers. This range of seals is available in a selection of sizes and a choice of styles, including; cable lock, EZE seal, smooth grip and metal lock.

  • Materials: Acrylonitrile Butadiene Styrene (ABS), Aluminium, Polypropylene (PP) and Steel
  • Colours: Blue, Green, Natural, Orange, Red, White and Yellow


Series Code :SRArrowLock, SR1153, SR1152, SR1151, SRZipLock, SRSphereLock, SRLuggagelock

Threaded O-ring Plugs - UNF Threads

Threaded O-ring Plugs for UNF Threads include a compressed flange lip and an O-ring (optional) to provide a watertight seal and superior leakage prevention for hydraulic threads. The threaded O-ring keeps contaminants like dirt, dust, debris, and moisture out of the hole.

It may be installed using a hex wrench, screwdriver, or hand. Often used on flat-faced hydraulic fittings, it is recommended when strength and resistance are desired as it can withstand temperatures that range from -40F to 230F | -40C to 110C. Used in oil and gas, plumbing, and automotive sectors where leak-proof seals are crucial to system integrity.

  • Material: PP, HDPE
  • Colour: Yellow, Black, Red
  • Material Flammability Standard: UL94 V-0

Threaded Protection Plugs - UNF Threads

These Threaded Protection Plugs for UNF Threads protect threads and fittings from damage during production, storage, and shipment, ensuring that they remain in good condition and ready for use when needed. The protection plug protects from contaminants like dirt, dust, debris, and moisture from the hole.

It features fewer thread forms for faster application and may be applied or removed with a hand, hex spanner, or screwdriver. Used in various applications, including hydraulic, pneumatic, and general engineering.

  • Material: PP, LDPE, HDPE
  • Colour: Yellow, Black, Red


Series Code :SR1002, SR5762, SR1077, SRF0029

Utility & Meter Seals

Utility and Metre Seals are specially designed to reveal evidence of tampering or breach for a wide range of metres or objects that require a thin wire seal. This includes water and electricity metres and junction boxes.

The thin metal wire can be passed through small or difficult apertures, to then be pulled tight and clicking the securing housing into place.

Our range is available in several distinctive types where the cut wire length is supplied and included with the purchase of the seal or sold separately to the seal. The type options include; AnchorLock, ClickLock, CrimpLock and TwistLock.

AnchorLock is suitable for a wide range of applications thanks to its flexible wire length (included). It features serial numbers on both the inner and outer parts, for added tamper evident benefits. The PC body is bolstered by a high-impact Polystyrene insert.

ClickLock is moulded in PC with two sets of locking arrows. The sealing mechanism can be viewed and inspected. No pliers are required to engage.

CrimpLock is designed specially for sealing metres and safety boxes, and is sealed with crimping pliers. The continuous roll of wire is available to purchase separately. The steel CrimpLock Wire comes on a 2kg spool and is approximately 260 metres in length.

TwistLock is easily applied for all types of utility metres. It features a one-direction rotatable locking mechanism and the seal handle can be snapped off after application to prevent manipulation. The body is transparent and has an ABS twister.

  • Body Materials: Polycarbonate (PC) and Acrylonitrile Butadiene Styrene Resin (ABS Resin)
  • Colours: Blue, Green, Orange, Red, White and Yellow


Series Code :SRMeterLock, SRH0047, SRH0046, SRH0044, SRH0042, SRCrimpLock