PTFE Ball Sizes

Solid PTFE balls from 5 mm to 310 mm. Metric and fractional inch diameters manufactured in-house for industrial valve, pump, and OEM assemblies.

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Technical Guide

PTFE Ball Sizes & Tolerances

Sizing accuracy is critical when sourcing polytetrafluoroethylene (PTFE) balls for industrial fluid handling systems. Standard check valves, reciprocating dosing pumps, and liquid level floats rely on precise nominal dimensions to function without leaks, pressure drops, or alignment failure. Hemsun Engg. Industries manufactures solid PTFE spheres across metric and fractional inch diameters across 5 mm to 310 mm. Beyond catalog standards, we support B2B clients with custom mold tooling and turning capabilities to produce custom diameters and specialized shapes as per drawings.

5 mm to 310 mm

Diameter Range

Metric & Inch

Standard Units

Custom Sizes

In-House Tooling

OEM Support

Direct B2B Manufacturer

Sizing Chart

Standard PTFE Ball Size Table

Search or filter manufactured diameters in metric (mm) and imperial (fraction or decimal inch).

Ball Diameter (mm) Inch Equivalent Availability Custom Possible
5 mm 0.197″ Standard / Stock Yes
6 mm 0.236″ Standard / Stock Yes
6.35 mm 1/4″ Standard / Stock Yes
7 mm 0.276″ Standard / Stock Yes
7.9 mm 5/16″ Standard / Stock Yes
8 mm 0.315″ Standard / Stock Yes
9.52 mm 3/8″ Standard / Stock Yes
10 mm 0.394″ Standard / Stock Yes
11.11 mm 7/16″ Standard / Stock Yes
12 mm 0.472″ Standard / Stock Yes
12.7 mm 1/2″ Standard / Stock Yes
15 mm 0.591″ Standard / Stock Yes
16 mm 0.63″ Standard / Stock Yes
18 mm 0.709″ Standard / Stock Yes
19 mm 0.748″ Standard / Stock Yes
20 mm 0.787″ Standard / Stock Yes
21 mm 0.827″ Standard / Stock Yes
22 mm 0.866″ Standard / Stock Yes
23 mm 0.906″ Standard / Stock Yes
25 mm 0.984″ Standard / Stock Yes
25.4 mm 1″ Standard / Stock Yes
28.57 mm 1-1/8″ Made-to-Order Yes
30 mm 1.181″ Made-to-Order Yes
32 mm 1.26″ Made-to-Order Yes
35 mm 1.378″ Made-to-Order Yes
36 mm 1.417″ Made-to-Order Yes
38 mm 1.496″ Made-to-Order Yes
40 mm 1.575″ Made-to-Order Yes
41.27 mm 1-5/8″ Made-to-Order Yes
43 mm 1.693″ Made-to-Order Yes
44.45 mm 1-3/4″ Made-to-Order Yes
46 mm 1.811″ Made-to-Order Yes
47.62 mm 1-7/8″ Made-to-Order Yes
50 mm 1.969″ Made-to-Order Yes
50.8 mm 2″ Made-to-Order Yes
55.57 mm 2-3/16″ Made-to-Order Yes
56 mm 2.205″ Made-to-Order Yes
57.15 mm 2-1/4″ Made-to-Order Yes
60 mm 2.362″ Made-to-Order Yes
63 mm 2.48″ Made-to-Order Yes
63.5 mm 2-1/2″ Made-to-Order Yes
64 mm 2.52″ Made-to-Order Yes
65 mm 2.559″ Made-to-Order Yes
68 mm 2.677″ Made-to-Order Yes
69.85 mm 2-3/4″ Made-to-Order Yes
70 mm 2.756″ Made-to-Order Yes
72 mm 2.835″ Made-to-Order Yes
73 mm 2.874″ Made-to-Order Yes
75 mm 2.953″ Made-to-Order Yes
76.2 mm 3″ Made-to-Order Yes
80 mm 3.15″ Made-to-Order Yes
82.55 mm 3-1/4″ Made-to-Order Yes
85 mm 3.346″ Made-to-Order Yes
90 mm 3.543″ Made-to-Order Yes
92 mm 3.622″ Made-to-Order Yes
95.25 mm 3-3/4″ Made-to-Order Yes
98.42 mm 3-7/8″ Made-to-Order Yes
100 mm 3.937″ Made-to-Order Yes
101.6 mm 4″ Made-to-Order Yes
108 mm 4.252″ Made-to-Order Yes
112 mm 4.409″ Made-to-Order Yes
115 mm 4.528″ Made-to-Order Yes
120 mm 4.724″ Made-to-Order Yes
125 mm 4.921″ Made-to-Order Yes
127 mm 5″ Made-to-Order Yes
130 mm 5.118″ Made-to-Order Yes
131.77 mm 5-3/16″ Made-to-Order Yes
133.35 mm 5-1/4″ Made-to-Order Yes
146 mm 5.748″ Made-to-Order Yes
150 mm 5.906″ Made-to-Order Yes
152 mm 5.984″ Made-to-Order Yes
160 mm 6.299″ Made-to-Order Yes
168 mm 6.614″ Made-to-Order Yes
170 mm 6.693″ Made-to-Order Yes
172 mm 6.772″ Made-to-Order Yes
177.8 mm 7″ Made-to-Order Yes
180 mm 7.087″ Made-to-Order Yes
195.27 mm 7-11/16″ Made-to-Order Yes
224 mm 8.819″ Made-to-Order Yes
248.92 mm 9-13/16″ Made-to-Order Yes
310 mm 12.205″ Heavy Machined MTO Yes
Bespoke Production

Custom Outer Diameter (OD) Fabrication

For specialized assemblies where catalog diameters cannot fit, Hemsun Engg. Industries provides bespoke sizing. Our in-house toolroom designs and cuts custom steel dies, allowing us to mold preforms to non-standard outer diameters (OD) for leak-free sealing.

Whether you need a specific metric size or modifications like flat spots, grooved slots, or threads, our workshop machines spheres to exact print. Full specifications on our Custom PTFE Balls page.

Sizing Guide

How to Select the Correct PTFE Ball Size

Choosing the correct ball size depends entirely on your industrial application. Use this general guide for selecting target diameters. For grade, tolerance, and material selection see the Full selection guide.

Typical Application Sizing Rationale Recommended Nominal Sizing
Industrial Ball Check Valves Ball diameter must be 20% to 30% larger than the seat orifice to prevent the ball from passing through under backpressure while maintaining flow. 6.00 mm to 50.80 mm (1/4″ to 2″)
Reciprocating Diaphragm Pumps Ground spheres ensure rapid seating cycles and prevent pump cavitation. 12.70 mm to 76.20 mm (1/2″ to 3″)
Liquid Level Floats & Indicators Larger nominal diameters are preferred to maximize volume displacement and float buoyancy. 50.80 mm to 150.00 mm (2″ to 6″)
Large Chemical Manifolds Turned blocks isolate pipelines carrying aggressive chemicals under elevated pressure. 100.00 mm to 310.00 mm (4″ to 12-1/5″)
Dimensional Tolerances

Standard Sizing Tolerances

Dimensional tolerances and sphericity determine the sealing performance of a solid ball valve. Hemsun Engg. Industries machines spheres to standard grinding tolerances. Our standard centerless ground virgin PTFE balls achieve a dimensional tolerance of ±0.05 mm for small diameters (up to 25.4 mm / 1″).

For medium diameters (38.10 mm to 76.20 mm), standard tolerances are ±0.08 mm to ±0.15 mm. For extra-large turned balls (100 mm to 310 mm), tolerances are held within ±0.25 mm to ±0.50 mm.

When applications demand high precision (such as chromatography pumps or sensitive gas valves), we can ground the balls to extra-tight tolerances of ±0.02 mm. Sphericity and roundness checks are performed using dial test indicators and digital metrology instruments to guarantee batch accuracy. See also the selection guide for grade and tolerance framework.

Reference Chart

Metric to Inch Sizing Equivalents

Fractional inch sizes manufactured at the exact millimeter diameters listed in the main chart.

Fractional Size Decimal Inch Manufactured Diameter (mm)
1/4″ 0.25″ 6.35 mm
5/16″ 0.311″ 7.9 mm
3/8″ 0.375″ 9.52 mm
7/16″ 0.437″ 11.11 mm
1/2″ 0.5″ 12.7 mm
1″ 1″ 25.4 mm
1-1/8″ 1.125″ 28.57 mm
1-5/8″ 1.625″ 41.27 mm
1-3/4″ 1.75″ 44.45 mm
1-7/8″ 1.875″ 47.62 mm
2″ 2″ 50.8 mm
2-3/16″ 2.188″ 55.57 mm
2-1/4″ 2.25″ 57.15 mm
2-1/2″ 2.5″ 63.5 mm
2-3/4″ 2.75″ 69.85 mm
3″ 3″ 76.2 mm
3-1/4″ 3.25″ 82.55 mm
3-3/4″ 3.75″ 95.25 mm
3-7/8″ 3.875″ 98.42 mm
4″ 4″ 101.6 mm
5″ 5″ 127 mm
5-3/16″ 5.188″ 131.77 mm
5-1/4″ 5.25″ 133.35 mm
7″ 7″ 177.8 mm
7-11/16″ 7.688″ 195.27 mm
9-13/16″ 9.8″ 248.92 mm
Manufacturing

In-House Production Capabilities

Our Gujarat plant controls all sizing parameters directly. Raw polymer powder is compounded and compacted at 20-25 MPa to eliminate voids. Programmable sintering ovens fuse the molecular chains at 370°C.

Precision CNC lathes machine custom features (holes, threads, flats) and multi-stage centerless grinders achieve roundness and a polished surface finish. Metrology inspections verify nominal sizing, roundness, and surface finish before dispatch.

FAQs

PTFE Ball Sizing FAQ

What is the largest PTFE ball size you can manufacture?

We manufacture solid PTFE balls up to 310 mm (approx. 12-1/5″) in diameter. These extra-large spheres are compression molded as solid billets and custom-turned and ground to print.

Can you manufacture custom metric diameters not listed in your chart?

Yes. We cut custom steel dies in our in-house toolroom, enabling us to mold and turn custom metric diameters (e.g. 17.5 mm, 43 mm, etc.) to your precise drawing specifications.

What is the standard machining tolerance for HEMSUN PTFE balls?

Standard centerless ground balls achieve ±0.05 mm tolerance for diameters up to 25.4 mm (1″). Larger sizes range from ±0.08 mm to ±0.25 mm. Extra-tight tolerances down to ±0.02 mm are available on request.

What is the typical B2B lead time for custom sizing orders?

Standard stock sizes ship within 24 to 48 hours. Custom size runs requiring special die tooling typically take 10 to 15 business days depending on volume.

What is the smallest PTFE ball size available?

Our standard smallest catalog diameter is 5 mm. Fractional inch sizes from 1/4″ (6.35 mm) upward are also manufactured in-house.

Do you provide metric and fractional inch equivalents?

Yes. We supply balls in both standard metric dimensions (mm) and fractional imperial dimensions (inches). Material test certificates will show both dimensions for clarity.

Can you provide filled PTFE compounds in custom sizes?

Yes. We compound, press, and machine filled PTFE grades including glass fiber, carbon, graphite, bronze, and MoS2 in custom nominal sizes to increase load capacity and wear life.

Get Quote

Request PTFE Ball Size Pricing

Tell us your target diameter, quantity, material grade, and delivery destination for a direct factory quote.

  • Response within 24 hours on business days
  • MOQ flexible — samples and OEM volumes
  • Engineering drawings accepted
  • Export supply worldwide
  • Metric and inch sizes from 5 mm to 310 mm
Hemsun Engg. Industries
224/1, Nr. Precision Autowares, Nr. IOCL Petrol Pump, Zak-Vahelal Road, Dahegam
Gandhinagar, Gujarat 382305
India
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