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Style 1800 Glass-Filled PTFE Piston Seal, 4.00 Inch Bore Diameter, 3.44 Inch Groove Diameter, Inch Groove Width

Description & Features

Designed for hydraulic cylinder applications, the Style 1800 Glass-Filled PTFE Piston Seal is sized for a 4.00-inch bore diameter with a 3.44-inch groove diameter. The seal combines a 15% glass-filled PTFE sealing element with a rubber energizer, providing reliable performance across a pressure range of 0 to 5,000 PSI and a temperature range of -40°F to 220°F.

Manufactured by Hercules Sealing Products, this piston seal carries a bore tolerance of ±0.002 inches and a seal height of 0.269 inches. The piston diameter dimension of 3.999 inches is specified for pistons without wear rings. The glass-filled PTFE construction offers low friction and good chemical resistance, making it well suited for demanding hydraulic cylinder environments.

SKU: PS1800-64

Supplier Part Number (MPN): PS1800-64

Alternate Part Numbers: C1DH81, MI-01036952, MINO-00407X30120

Specifications

Bore 4	Bore Tolerance (in) ±0.002	Cross Section Tolerance (in) +0.006 / -0	Brand Hercules Sealing Products	Brand Hercules Sealing Products	Pack Size 1.00	UOM EA	Groove Dia. E 3.44	Groove Width Tolerance (in) ±0.002	Piston Dia. F 4.00	Piston Dia. Tolerance (in) +0/-0.006	Seal Cross Section C 0.09	Seal Height B 0.27	Seal Height Tolerance (in) +0.005 / -0	Supplier Part Number PS1800-64	Alternate Part Numbers Alternate Part Number C1DH81, Alternate Part Number MI-01036952, Alternate Part Number MINO-00407X30120	Product Weight 0.05 lbs

Similar Products

Model Number	Bore	Seal Height B	Seal Cross Section C	Groove Dia. E	Piston Dia. F	Bore Tolerance (in)	Piston Dia. Tolerance (in)	Cross Section Tolerance (in)	Seal Height Tolerance (in)	Groove Width Tolerance (in)
PS1800-20 Style 1800 PTFE Piston Seal	1.25	0.116	0.067	0.94	1.249	±0.002	+0/-0.005	+0.006 / -0	+0.005 / -0	±0.002
PS1800-24 Style 1800 PTFE Piston Seal	1.5	0.116	0.067	1.19	1.499	±0.002	+0/-0.005	+0.006 / -0	+0.005 / -0	±0.002
PS1800-32 Style 1800 PTFE Piston Seal	2	0.116	0.067	1.69	1.999	±0.002	+0/-0.005	+0.006 / -0	+0.005 / -0	±0.002
PS1800-36 Style 1800 PTFE Piston Seal	2.25	0.116	0.067	1.94	2.249	±0.002	+0/-0.005	+0.006 / -0	+0.005 / -0	±0.002
PS1800-40 Style 1800 PTFE Piston Seal	2.5	0.116	0.067	2.19	2.499	±0.002	+0/-0.005	+0.006 / -0	+0.005 / -0	±0.002
PS1800-48 Style 1800 PTFE Piston Seal	3	0.269	0.087	2.44	2.999	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-56 Style 1800 PTFE Piston Seal	3.5	0.269	0.087	2.94	3.499	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-64 Style 1800 PTFE Piston Seal	4	0.269	0.087	3.44	3.999	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-68 Style 1800 PTFE Piston Seal	4.25	0.269	0.087	3.69	4.249	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-72 Style 1800 PTFE Piston Seal	4.5	0.269	0.087	3.94	4.499	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-80 Style 1800 PTFE Piston Seal	5	0.269	0.087	4.44	4.999	±0.002	+0/-0.006	+0.006 / -0	+0.005 / -0	±0.002
PS1800-88 Style 1800 PTFE Piston Seal	5.5	0.362	0.142	4.738	5.499	±0.002	+0/-0.007	±0.005	+0.005 / -0	±0.002
PS1800-96 Style 1800 PTFE Piston Seal	6	0.362	0.142	5.238	5.999	±0.002	+0/-0.007	±0.005	+0.005 / -0	±0.002

Product Questions & Answers (2)

Question by: Harold K on Jun 28, 2025, 7:41 PM

got a 4 inch bore cylinder, will this Style 1800 seal sit right in a 3.44 groove, or am i missin something

Answer by: Customer Support on Jun 29, 2025, 9:13 PM

The key callouts are a 4.00 inch bore, 3.44 inch groove diameter, and a 0.269 inch seal height. It also lists a bore tolerance of plus or minus 0.002 inches, and the seal cross section is 0.087 inch with a cross section tolerance of +0.006 / -0. Those are the dimensions you would match up to your cylinder groove and bore.

Question by: Rusty S on Jun 9, 2025, 7:31 AM

Got a 4-inch bore cylinder that needs a new piston seal, will this one fit, and is there anything I need to know about the piston diameter before I go throwing it in?

Answer by: Customer Support on Jun 11, 2025, 6:14 AM

For a 4.00-inch bore, this seal is spec'd to work with a piston diameter of 3.999 inches. That dimension is given for pistons without wear rings, so if your piston runs wear rings, that measurement may not apply directly. Bore tolerance is plus or minus 0.002 inches, and the piston diameter tolerance runs plus zero, minus 0.006 inches, so there's a little room on the tight side. The groove diameter is 3.44 inches with a seal height of 0.269 inches. Get those dimensions confirmed on your piston before you install and you should be in good shape.