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Style 1800 Glass-Filled PTFE Piston Seal, 2.50 Inch Bore Diameter, 2.19 Inch Groove Diameter, Inch Groove Width

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Bore
2.50
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
2.19
Groove Width Tolerance (in)
±0.002
Piston Dia. F
2.50
Piston Dia. Tolerance (in)
+0/-0.005
Seal Cross Section C
0.07
Seal Height B
0.12
Seal Height Tolerance (in)
+0.005 / -0
Supplier Part Number
PS1800-40
Alternate Part Numbers
Alternate Part Number C1DH77, Alternate Part Number MI-01038309, Alternate Part Number MINO-00407X30236
Product Weight
0.01 lbs
Product Questions & Answers 2

Product Questions & Answers

got a piston that measures 2.499, is this seal the right fit or am i gonna be fighting it
Question by: Bonnie H on Mar 23, 2026, 7:47 AM
Fit comes down to the bore and piston dimensions this seal was built around. It is sized for a 2.50 inch bore with a piston diameter F of 2.499 inches, and it calls out a bore tolerance of plus or minus 0.002 inches and a piston diameter tolerance of +0 / -0.005 inches. If your piston is 2.499 and your bore is in that 2.50 range, it matches the intended sizing.
Answer by: Customer Support on Mar 25, 2026, 7:56 AM
Got a cylinder with a 2.50 inch bore, this the right seal for that, and what should the piston diameter be machined to?
Question by: Freddie K on Jun 16, 2025, 3:39 PM
For a 2.50 inch bore, this seal fits right. The piston diameter dimension listed is 2.499 inches, with a tolerance of +0 and -0.005 inches. Keep in mind those dimensions are given for pistons without wear rings, so if your setup uses wear rings you'd want to account for that before assuming the fit is correct.
Answer by: Customer Support on Jun 18, 2025, 8:55 AM

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Model Number Bore Seal Height B Seal Cross Section C Groove Width D 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) Price Buy Now
PS1800-20 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 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 2 0.116 0.067 1.69 1.999 ±0.002 +0/-0.005 +0.006 / -0 +0.005 / -0 ±0.002
PS1800-36 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 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 3 0.269 0.087 2.44 2.999 ±0.002 +0/-0.006 +0.006 / -0 +0.005 / -0 ±0.002
PS1800-56 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 4 0.269 0.087 3.44 3.999 ±0.002 +0/-0.006 +0.006 / -0 +0.005 / -0 ±0.002
PS1800-68 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 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 5 0.269 0.087 4.44 4.999 ±0.002 +0/-0.006 +0.006 / -0 +0.005 / -0 ±0.002
PS1800-88 5.5 0.362 0.142 4.738 5.499 ±0.002 +0/-0.007 ±0.005 +0.005 / -0 ±0.002
PS1800-96 6 0.362 0.142 5.238 5.999 ±0.002 +0/-0.007 ±0.005 +0.005 / -0 ±0.002