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HERCULES METRIC O-RING

Description & Features

Manufactured by Hercules Sealing Products, this metric O-ring is designed for use in hydraulic and industrial sealing applications where metric-dimensioned components require reliable static or dynamic seals. The 40 x 3 mm sizing, indicating a 40 mm inner diameter and 3 mm cross-section, makes it suitable for metric-standard cylinders, fittings, and valve assemblies commonly found in hydraulic and fluid power systems.

Hercules Sealing Products is a recognized supplier of sealing components across industrial markets, and this O-ring is part of their metric series intended to meet the dimensional standards expected in European and metric-based equipment. It is well-suited for replacement and MRO applications where precise metric sizing is required.

SKU: MOR-40X3

Supplier Part Number (MPN): MOR-40X3

Alternate Part Numbers: C1KW37

Specifications

Alternate Part Numbers Alternate Part Number C1KW37	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Supplier Part Number MOR-40X3	Product Weight 0.01 lbs

Product Questions & Answers (3)

Question by: Johnny R on Sep 18, 2025, 3:29 PM

Got a metric cylinder on an older piece of equipment that needs a new seal, the bore takes a 40mm ID with a 3mm cross section. This the right part?

Answer by: Customer Support on Sep 19, 2025, 7:41 PM

For a 40mm inner diameter with a 3mm cross-section, MOR-40X3 is exactly what you're after. Hercules Sealing Products makes this as part of their metric O-ring series, so the dimensions are built to metric standard. Works for both static and dynamic sealing setups, which covers most cylinder and fitting applications you'd run into on metric-spec equipment.

Question by: Sherry S on Nov 3, 2025, 7:41 AM

So this is for hydraulic stuff that uses metric sizes, right? Just want to make sure before I order.

Answer by: Customer Support on Nov 5, 2025, 6:27 AM

Correct, this O-ring from Hercules Sealing Products is specifically designed for hydraulic and industrial applications that require metric-dimensioned components. The 40 x 3 mm sizing confirms it's intended for metric-standard cylinders, fittings, and valve assemblies.

Question by: Lynn R on May 15, 2025, 10:18 AM

got a metric groove that calls for a 40 x 3 o-ring. is that the same size as this one?

Answer by: Customer Support on May 16, 2025, 3:12 PM

The 40 x 3 mm size means a 40 mm inner diameter with a 3 mm cross section, which matches the common way metric O-rings are specified for grooves and parts.