Product
  • Hydraulic Cylinder Tube

Hydraulic Cylinder Tube

Tubes are homogeneous and own superior mechanical properties after cold drawn and stress relief annealing. For higher I.D. surface requirement, I.D. of tubes are further honed by precise honing machines which produced and designed by Costar to match the condition, roughness and tolerance of designated standard.

Costar also has adequate stock in standard sizes. Besides, special specification, material and size are available upon request to satisfy all customers’ needs.
Grade (Carbon Steel tube for machine structural purposes)

Product Information

Grade

Chemical Composition %

Mechanical Properties

C

Si

Mn

P

S

Tensile Strength kg/mm2

Yield Strength kg/mm2

Elongation %

St-52

0.13

|

0.18

0.15

|

0.30

1.20

|

1.40

 

0.025 max.

 

 

0.025 max.

 

60 min.

52 min.

15 min.

STKM -13C

 

0.25

max.

 

 

0.35

max.

 

0.30

|

0.90

 

0.04 max.

 

 

0.04 max.

 

52 min.

39 min.

15 min.


Specification

I.D. Surface Roughness : Ra 0.8 μm max.

I.D. Tolerance : ISO H9, H7/ H8 (upon request)

Wall Thickness Tolerance : ±10%

Straightness : 1/1000 max.

 

Formula for cylinder design pressure

P :  Design Pressure (kg/cm2)
Y :  Yield Strength (kg/mm2)
t :  Wall Thickness (mm)
S :  Safety Factor
di : Inside Diameter (mm)

 

Available sizes in Stock

I.D. X O.D. (mm)

Service Pressure

kg/cm2

I.D. X O.D. (mm)

Service Pressure

kg/cm2

I.D. X O.D. (mm)

Service Pressure

kg/cm2

I.D. X O.D. (mm)

Service Pressure

kg/cm2

20X30

538

63X71

178

100X120

265

140X165

241

25X32

349

63X73

217

100X125

319

150X160

99

30X36

265

63X76

272

100X130

369

150X163

127

30X40

400

65X75

212

105X120

198

150X168

169

32X42

381

65X80

298

105X125

254

150*170

185

35X45

355

70X80

198

110X120

132

150X175

227

40X45

175

70X82

232

110X125

189

160X172

109

40X46

206

70X85

281

110X130

244

160X180

174

40X48

265

70X90

355

110X135

295

160X185

213

40X50

317

75X85

185

115X130

182

160X190

251

40X55

439

75X90

265

115X135

235

165X190

208

40X60

538

80X87

127

115X140

284

170X190

166

45X55

290

80X90

175

120X132

143

170X195

203

45X60

400

80X95

251

120X135

175

170X200

238

50X55

143

80X100

326

120X140

227

180X196

129

50X57

194

85X95

166

125X135

116

180X202

172

50X58

218

85X100

237

125X137

139

180X212

239

50X60

265

90X100

158

125X140

170

180X216

265

50X65

369

90X105

227

125X145

218

190X220

216

50X70

459

90X110

289

125X152

283

200X216

116

55X65

244

95X110

216

130X142

133

200X232

218

55X70

341

95X115

276

130X150

212

200X242

276

60X70

227

100X107

103

130X155

256

220X250

190

60X75

319

100X110

144

135X160

248

230X250

126

60X80

400

100X114

194

140X153

136

250X267

100

63X69

137

100X116

218

140X160

198

250X298

265

 

*Above recommended service pressure is based on safety factor S=3.0 for grade St-52.

 For grade STKM-13C, only 75% pressure is recommended.