Cylinder bore aur pressure se force kaise nikalein?

Formula: Force (kgf) = Bore² (cm²) × Pressure (bar) × 0.7854 / 9.807. Example: 63 mm bore = 6.3 cm. Force at 6 bar ≈ 6.3 × 6.3 × 6 × 0.7854 / 9.807 ≈ 19 kgf. Multiply by number of cm² — full answer ≈ 187 kgf.

Why is pull force always less than push force?

Because the piston rod occupies part of the piston face during retraction. The effective area during pull stroke is (bore² − rod²) × π/4, which is always smaller than the full bore area used during push stroke.

What pressure should I use — 4 bar, 6 bar, or 8 bar?

Most Indian factories run their pneumatic lines at 5–7 bar (6 bar is most common). Check your FRL regulator setting. Never exceed the cylinder's rated max pressure — SPAC standard rating is 10 bar.

What safety factor should I add when sizing a cylinder?

1.4× for horizontal motion, 2× for vertical lifting, and 3× for safety-critical or shock-loaded applications. So if you need to lift 100 kg vertically, size the cylinder for at least 200 kgf push force.

Which SPAC cylinder do I need for 200 kgf force?

At 6 bar, a SPAC ESNC 63 mm bore gives ~187 kgf (slightly short) and a 80 mm bore gives ~307 kgf (good margin). For 200 kgf, pick the 80 mm bore. Contact Shri Narayan Machinery Noida (authorized SPAC dealer) for sizing help.

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Pneumatic Cylinder Force Calculator

Find push & pull force for any cylinder bore and pressure

किसी भी बोर और प्रेशर के लिए push और pull force निकालें

Quick Overview

Pneumatic cylinder force depends on three things: bore diameter, rod diameter, and air pressure. The push force (extending stroke) is calculated as force = π/4 × bore² × pressure, where bore is in metres, pressure is in Pascals, and force is in Newtons. For practical shop-floor use, a 63 mm bore SPAC ESNC cylinder running at 6 bar produces about 187 kgf of push force. The pull force (retracting stroke) is always lower because the piston rod occupies part of the piston face area — effective area becomes (bore² − rod²) × π/4. This calculator accepts bore from 8 mm (ISO 6432 mini cylinders) up to 320 mm (large ISO 15552 tie-rod cylinders), rod diameter, and line pressure in bar, and returns both push and pull force in kgf and Newtons — the units you see on SPAC catalogue data sheets.

Calculator

Bore diameter(बोर व्यास)

SPAC common: 32, 40, 50, 63, 80, 100 mm

Rod diameter(रॉड व्यास)

Auto-suggested from bore

Working pressure(प्रेशर)

bar

Indian factory air line typically 5–7 bar

Push Force (extending)

190.7kgf

= 1870 N

Pull Force (retracting)

171.5kgf

= 1682 N

Pull force is lower because the piston rod reduces effective piston face area by π/4 × rod² = 314 mm².

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ƒFormula

Push Force = (π/4) × Bore² × Pressure | Pull Force = (π/4) × (Bore² − Rod²) × Pressure

Bore and rod diameters are in metres, pressure is in Pascals (1 bar = 100,000 Pa), and force comes out in Newtons. Divide Newtons by 9.80665 to get kgf. The 'pull' calculation subtracts the area occupied by the rod from the total piston face area.

Units: Force: Newton (N) / kilogram-force (kgf) · Bore & Rod: millimetre (mm) · Pressure: bar

Cylinder force ka calculation kaise karein?

Pneumatic cylinder ka force uske bore (अंदरूनी व्यास) aur air pressure pe depend karta hai. Formula simple hai: Force (Newton) = π/4 × Bore² (metre²) × Pressure (Pascal). Shop floor pe log kgf (kilogram-force) mein baat karte hain — 1 kgf ≈ 9.807 Newton. Jab cylinder extend hota hai (push stroke), toh poora piston face area use hota hai. Jab retract hota hai (pull stroke), toh rod ki wajah se area thoda kam ho jata hai — isliye pull force hamesha push force se kam hota hai. ISO 15552 cylinders (SPAC ESNC) mein bore 32 mm se 320 mm tak hote hain, aur ISO 6432 (SPAC SDNU) mein 8 mm se 25 mm tak.

उदाहरण / Example: Example: SPAC ESNC 63 mm bore cylinder, 20 mm rod, 6 bar pe chalta hai. Push force ≈ 187 kgf, Pull force ≈ 168 kgf. Yeh force 150 kg weight lift kar sakta hai comfortably.

Worked Examples

Lifting a 150 kg load with a pneumatic cylinder

Problem: You need a cylinder to lift 150 kg vertically at 6 bar factory air pressure. Which bore do you pick?

Solution: 150 kgf × 1.4 safety factor = 210 kgf required. At 6 bar: area needed ≈ 210 / 6.12 ≈ 34.3 cm². Bore = √(34.3 × 4/π) ≈ 6.6 cm = 66 mm. Pick the next standard size up — SPAC ESNC 80 mm bore — which gives ~308 kgf at 6 bar (2× safety margin).

Press-fit operation with a mini cylinder

Problem: A small assembly press needs 40 kgf push force at 6 bar. What SPAC SDNU size?

Solution: 40 kgf = 392 N. Area needed = 392 / (6×100,000) = 6.53 cm² = 653 mm². Bore = √(653×4/π) ≈ 28.8 mm. Closest standard: SPAC SDNU 32 mm bore (uses ISO 6432) — gives 48 kgf push at 6 bar.

Why is pull force less than push force?

Problem: A SPAC ESNC 63 mm bore / 20 mm rod cylinder at 6 bar shows 187 kgf push but only 168 kgf pull. Why?

Solution: During push (extension), full piston face area is pressurised. During pull (retraction), the rod occupies π/4 × 20² = 314 mm² of that face. Effective area drops from 3117 mm² to 2803 mm² — about 10% lower force.

SPAC Cylinder Push Force at 6 bar — Standard Bores

SPAC सिलेंडर push force @ 6 bar — मानक bore

Bore (mm)	Rod (mm)	Push Force (kgf)	Pull Force (kgf)	SPAC Series
12	6	6.9	5.1	SDNU (ISO 6432)
16	6	12.3	10.6	SDNU (ISO 6432)
20	8	19.2	16.1	SDNU (ISO 6432)
25	10	30.0	25.2	SDNU (ISO 6432)
32	12	49.2	42.3	ESNC (ISO 15552)
40	16	76.9	64.6	ESNC (ISO 15552)
50	20	120.2	100.9	ESNC (ISO 15552)
63	20	190.9	171.7	ESNC (ISO 15552)
80	25	307.5	277.5	ESNC (ISO 15552)
100	25	480.5	450.5	ESNC (ISO 15552)
125	32	750.8	702.8	ESNC (ISO 15552)
160	40	1230.6	1153.7	ESNC (ISO 15552)

Values assume 6 bar working pressure. Multiply by (your pressure / 6) to scale. For a 7 bar line, multiply by 1.167.

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SPAC ESNC Series — ISO 15552 Cylinders

Tie-rod profile cylinders, 32–320 mm bore. The standard choice for 50+ kgf applications.

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SPAC SDNU Series — ISO 6432 Mini Cylinders

Round body mini cylinders, 8–25 mm bore. For small assembly and pick-and-place stations.

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Pneumatic Cylinder Repair Service

Seal replacement, rod re-chroming, bore honing. 24–72 hr turnaround. All brands.

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Frequently Asked Questions — Pneumatic Cylinder Force Calculator

Push Force (kgf) = (π/4) × bore² (cm²) × pressure (bar) / 9.80665. For a 63 mm bore at 6 bar: (3.14/4) × 6.3² × 6 / 9.807 = 19.09 kgf/cm² × area — approximately 187 kgf push force.

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