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70 Durometer Buna-N O-Ring, Inch OD, 6-3/4 Inch ID, 0.21 Inch Width

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Description & Features

Manufactured by Hercules Sealing Products, this 70 Durometer Buna-N O-Ring carries a dash size of -364 and is suited for a broad range of hydraulic and industrial sealing applications. With an actual ID of 6.725 inches, an actual OD of 7.145 inches, and a cross-section width of 0.21 inches, it fits standard -364 groove configurations reliably.

The 70 durometer Buna-N compound offers a balanced combination of flexibility and compression resistance, with a rated temperature range of -40°F to 240°F. This material performs well in contact with petroleum-based hydraulic fluids, making it a common choice for cylinders, valves, and fluid circuit sealing points in industrial equipment. Sold in a package quantity of 4.

SKU: A-364

Supplier Part Number (MPN): 568-364

Alternate Part Numbers: C1CG17

Specifications

Brand
HERCULES® SEALING PRODUCTS
Color
Black
Cross Section Shape
Round
Dash Size
364
Durometer
70A
Material
Buna-N
Series
568 Series
Suitable For Use With
Hydraulic Cylinders
System of Measurement
Imperial

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7-1/2 in

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1-1/4 in

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3/4 in

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1-1/8 in

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1-1/8 in

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0.69 in

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A-332 70 Durometer Buna-N O-Ring

332

70 Durometer Buna-N O-Ring, Inch OD, 4-7/8 Inch ID, 0.28 Inch Width

A-428 70 Durometer Buna-N O-Ring

428

4-7/8 in

70 Durometer Buna-N O-Ring, Inch OD, 2-7/8 Inch ID, 0.07 Inch Width

A-040 70 Durometer Buna-N O-Ring

40

70 Durometer Buna-N O-Ring, Inch OD, 7/16 Inch ID, 0.10 Inch Width

A-111 70 Durometer Buna-N O-Ring

111

0.44 in

70 Durometer Buna-N O-Ring, Inch OD, 2-3/8 Inch ID, 0.14 Inch Width

A-229 70 Durometer Buna-N O-Ring

229

70 Durometer Buna-N O-Ring, Inch OD, 10 Inch ID, 0.14 Inch Width

A-274 70 Durometer Buna-N O-Ring

274

70 Durometer Buna-N O-Ring, Inch OD, 2-1/2 Inch ID, 0.14 Inch Width

A-230 70 Durometer Buna-N O-Ring

230

2-1/2 in

70 Durometer Buna-N O-Ring, Inch OD, 1-5/8 Inch ID, 0.10 Inch Width

A-130 70 Durometer Buna-N O-Ring

130

1-5/8 in

70 Durometer Buna-N O-Ring, Inch OD, 2-5/8 Inch ID, 0.21 Inch Width

A-334 70 Durometer Buna-N O-Ring

334

70 Durometer Buna-N O-Ring, Inch OD, 11/16 Inch ID, 0.21 Inch Width

A-313 70 Durometer Buna-N O-Ring

313

0.69 in

70 Durometer Buna-N O-Ring, Inch OD, 1-5/16 Inch ID, 0.21 Inch Width

A-323 70 Durometer Buna-N O-Ring

323

1-5/16 in

70 Durometer Buna-N O-Ring, Inch OD, 3-5/8 Inch ID, 0.14 Inch Width

A-239-ORING 70 Durometer Buna-N O-Ring

239

HERCULES Sealing PRODUCTS O- Ring. 70 DU

568-354

354

70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.10 Inch Width

A-121 70 Durometer Buna-N O-Ring

121

1-1/16 in

70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.14 Inch Width

A-215 70 Durometer Buna-N O-Ring

215

1-1/16 in

70 Durometer Buna-N O-Ring, Inch OD, 7-1/4 Inch ID, 0.14 Inch Width

A-263 70 Durometer Buna-N O-Ring

263

70 Durometer Buna-N O-Ring, Inch OD, 1-11/16 Inch ID, 0.10 Inch Width

A-131-ORING 70 Durometer Buna-N O-Ring

131

70 Durometer Buna-N O-Ring, Inch OD, 1-1/8 Inch ID, 0.14 Inch Width

A-216 70 Durometer Buna-N O-Ring

216

1-1/8 in

70 Durometer Buna-N O-Ring, Inch OD, 3 Inch ID, 0.07 Inch Width

A-041 70 Durometer Buna-N O-Ring

41

3 in

70 Durometer Buna-N O-Ring, Inch OD, 1/4 Inch ID, 0.07 Inch Width

A-010 70 Durometer Buna-N O-Ring

10

1/4 in

ORING

568-357

357

ORING OD 3/4 W 3/32

568-113

113

0.56 in

70 Durometer Buna-N O-Ring, Inch OD, 9/16 Inch ID, 0.07 Inch Width

A-015 70 Durometer Buna-N O-Ring

15

0.56 in

70 Durometer Buna-N O-Ring, Inch OD, 6-1/2 Inch ID, 0.21 Inch Width

A-363 70 Durometer Buna-N O-Ring

363

70 Durometer Buna-N O-Ring, Inch OD, 2-7/16 Inch ID, 0.10 Inch Width

A-143 70 Durometer Buna-N O-Ring

143

70 Durometer Buna-N O-Ring, Inch OD, 12 Inch ID, 0.14 Inch Width

A-278 70 Durometer Buna-N O-Ring

278

70 Durometer Buna-N O-Ring, Inch OD, 3/8 Inch ID, 0.14 Inch Width

A-204 70 Durometer Buna-N O-Ring

204

0.38 in

70 Durometer Buna-N O-Ring, Inch OD, 3-3/8 Inch ID, 0.21 Inch Width

A-340 70 Durometer Buna-N O-Ring

340

70 Durometer Buna-N O-Ring, Inch OD, 4 Inch ID, 0.10 Inch Width

A-155 70 Durometer Buna-N O-Ring

155

70 Durometer Buna-N O-Ring, Inch OD, 3-1/4 Inch ID, 0.10 Inch Width

A-152 70 Durometer Buna-N O-Ring

152

70 Durometer Buna-N O-Ring, Inch OD, 6 Inch ID, 0.14 Inch Width

A-258-ORING 70 Durometer Buna-N O-Ring

258

70 Durometer Buna-N O-Ring, Inch OD, 5-5/8 Inch ID, 0.14 Inch Width

A-255 70 Durometer Buna-N O-Ring

255

70 Durometer Buna-N O-Ring, Inch OD, 1-1/4 Inch ID, 0.07 Inch Width

A-026 70 Durometer Buna-N O-Ring

26

1-1/4 in

70 Durometer Buna-N O-Ring, Inch OD, 13/16 Inch ID, 0.07 Inch Width

A-019 70 Durometer Buna-N O-Ring

19

0.81 in

70 Durometer Buna-N O-Ring, Inch OD, 11-1/2 Inch ID, 0.14 Inch Width

A-277 70 Durometer Buna-N O-Ring

277

70 Durometer Buna-N O-Ring, Inch OD, 2-3/4 Inch ID, 0.21 Inch Width

A-335 70 Durometer Buna-N O-Ring

335

70 Durometer Buna-N O-Ring, Inch OD, 5-7/8 Inch ID, 0.14 Inch Width

A-257 70 Durometer Buna-N O-Ring

257

70 Durometer Buna-N O-Ring, Inch OD, 3/8 Inch ID, 0.10 Inch Width

A-110-ORING 70 Durometer Buna-N O-Ring

110

0.38 in

70 Durometer Buna-N O-Ring, Inch OD, 10-1/2 Inch ID, 0.14 Inch Width

A-275 70 Durometer Buna-N O-Ring

275

70 Durometer Buna-N O-Ring, Inch OD, 2-3/8 Inch ID, 0.10 Inch Width

A-142 70 Durometer Buna-N O-Ring

142

70 Durometer Buna-N O-Ring, Inch OD, 7-1/2 Inch ID, 0.14 Inch Width

A-264 70 Durometer Buna-N O-Ring

264

7-1/2 in

7-3/4 in

70 Durometer Buna-N O-Ring, Inch OD, 6 Inch ID, 0.10 Inch Width

A-163 70 Durometer Buna-N O-Ring

163

70 Durometer Buna-N O-Ring, Inch OD, 1/2 Inch ID, 0.07 Inch Width

A-014 70 Durometer Buna-N O-Ring

14

1/2 in

70 Durometer Buna-N O-Ring, Inch OD, 1-7/8 Inch ID, 0.21 Inch Width

A-328 70 Durometer Buna-N O-Ring

328

70 Durometer Buna-N O-Ring, Inch OD, 3/4 Inch ID, 0.14 Inch Width

A-210-ORING 70 Durometer Buna-N O-Ring

210

3/4 in

1 in

70 Durometer Buna-N O-Ring, Inch OD, 1-7/8 Inch ID, 0.14 Inch Width

A-225 70 Durometer Buna-N O-Ring

225

70 Durometer Buna-N O-Ring, Inch OD, 1-3/16 Inch ID, 0.07 Inch Width

A-025 70 Durometer Buna-N O-Ring

25

1-3/16 in

70 Durometer Buna-N O-Ring, Inch OD, 2-1/2 Inch ID, 0.10 Inch Width

A-144 70 Durometer Buna-N O-Ring

144

2-1/2 in

70 Durometer Buna-N O-Ring, Inch OD, 8-1/2 Inch ID, 0.28 Inch Width

A-446 70 Durometer Buna-N O-Ring

446

70 Durometer Buna-N O-Ring, Inch OD, 2-11/16 Inch ID, 0.10 Inch Width

A-147 70 Durometer Buna-N O-Ring

147

2.69 in

70 Durometer Buna-N O-Ring, Inch OD, 1-15/16 Inch ID, 0.10 Inch Width

A-135 70 Durometer Buna-N O-Ring

135

70 Durometer Buna-N O-Ring, Inch OD, 7/16 Inch ID, 0.07 Inch Width

A-013 70 Durometer Buna-N O-Ring

13

0.44 in

70 Durometer Buna-N O-Ring, Inch OD, 1-5/16 Inch ID, 0.14 Inch Width

A-219 70 Durometer Buna-N O-Ring

219

1-5/16 in

70 Durometer Buna-N O-Ring, Inch OD, 1-7/16 Inch ID, 0.10 Inch Width

A-127 70 Durometer Buna-N O-Ring

127

70 Durometer Buna-N O-Ring, Inch OD, 6-3/4 Inch ID, 0.14 Inch Width

A-261 70 Durometer Buna-N O-Ring

261

70 Durometer Buna-N O-Ring, Inch OD, 2-1/8 Inch ID, 0.10 Inch Width

A-138 70 Durometer Buna-N O-Ring

138

2-1/8 in

70 Durometer Buna-N O-Ring, Inch OD, 3-1/4 Inch ID, 0.07 Inch Width

A-042 70 Durometer Buna-N O-Ring

42

70 Durometer Buna-N O-Ring, Inch OD, 5-5/8 Inch ID, 0.28 Inch Width

A-434 70 Durometer Buna-N O-Ring

434

70 Durometer Buna-N O-Ring, Inch OD, 1-3/4 Inch ID, 0.21 Inch Width

A-327 70 Durometer Buna-N O-Ring

327

1-3/4 in

70 Durometer Buna-N O-Ring, Inch OD, 3 Inch ID, 0.21 Inch Width

A-337 70 Durometer Buna-N O-Ring

337

3 in

70 Durometer Buna-N O-Ring, Inch OD, 2-3/4 Inch ID, 0.10 Inch Width

A-148 70 Durometer Buna-N O-Ring

148

ORING OD 1-1/16 W 1/8

568-211

211

0.81 in

70 Durometer Buna-N O-Ring, Inch OD, 2-13/16 Inch ID, 0.10 Inch Width

A-149 70 Durometer Buna-N O-Ring

149

70 Durometer Buna-N O-Ring, Inch OD, 7/8 Inch ID, 0.10 Inch Width

A-118 70 Durometer Buna-N O-Ring

118

70 Durometer Buna-N O-Ring, Inch OD, 7-3/4 Inch ID, 0.14 Inch Width

A-265 70 Durometer Buna-N O-Ring

265

70 Durometer Buna-N O-Ring, Inch OD, 11/16 Inch ID, 0.14 Inch Width

A-209 70 Durometer Buna-N O-Ring

209

0.69 in

70 Durometer Buna-N O-Ring, Inch OD, 1-3/4 Inch ID, 0.14 Inch Width

A-224 70 Durometer Buna-N O-Ring

224

1-3/4 in

70 Durometer Buna-N O-Ring, Inch OD, 3-1/2 Inch ID, 0.10 Inch Width

A-153 70 Durometer Buna-N O-Ring

153

70 Durometer Buna-N O-Ring, Inch OD, 7 Inch ID, 0.28 Inch Width

A-441 70 Durometer Buna-N O-Ring

441

70 Durometer Buna-N O-Ring, Inch OD, 2-1/4 Inch ID, 0.07 Inch Width

A-035 70 Durometer Buna-N O-Ring

35

70 Durometer Buna-N O-Ring, Inch OD, 13/16 Inch ID, 0.21 Inch Width

A-315 70 Durometer Buna-N O-Ring

315

0.81 in

70 Durometer Buna-N O-Ring, Inch OD, 1 Inch ID, 0.07 Inch Width

A-022 70 Durometer Buna-N O-Ring

22

1 in

70 Durometer Buna-N O-Ring, Inch OD, 5 Inch ID, 0.10 Inch Width

A-159 70 Durometer Buna-N O-Ring

159

70 Durometer Buna-N O-Ring, Inch OD, 4-3/4 Inch ID, 0.10 Inch Width

A-158 70 Durometer Buna-N O-Ring

158

70 Durometer Buna-N O-Ring, Inch OD, 1-1/16 Inch ID, 0.07 Inch Width

A-023 70 Durometer Buna-N O-Ring

23

1-1/16 in

70 Durometer Buna-N O-Ring, Inch OD, 1-7/16 Inch ID, 0.14 Inch Width

A-221 70 Durometer Buna-N O-Ring

221

70 Durometer Buna-N O-Ring, Inch OD, 3-3/4 Inch ID, 0.07 Inch Width

A-044 70 Durometer Buna-N O-Ring

44

70 Durometer Buna-N O-Ring, Inch OD, 3-7/8 Inch ID, 0.14 Inch Width

A-241-ORING 70 Durometer Buna-N O-Ring

241

70 Durometer Buna-N O-Ring, Inch OD, 5/8 Inch ID, 0.07 Inch Width

A-016 70 Durometer Buna-N O-Ring

16

5/8 in

70 Durometer Buna-N O-Ring, Inch OD, 4-3/8 Inch ID, 0.14 Inch Width

A-245 70 Durometer Buna-N O-Ring

245

70 Durometer Buna-N O-Ring, Inch OD, 5 Inch ID, 0.28 Inch Width

A-429 70 Durometer Buna-N O-Ring

429

70 Durometer Buna-N O-Ring, Inch OD, 6-1/4 Inch ID, 0.28 Inch Width

A-438 70 Durometer Buna-N O-Ring

438

70 Durometer Buna-N O-Ring, Inch OD, 9-1/2 Inch ID, 0.28 Inch Width

A-448 70 Durometer Buna-N O-Ring

448

70 Durometer Buna-N O-Ring, Inch OD, 3-1/4 Inch ID, 0.14 Inch Width

A-236 70 Durometer Buna-N O-Ring

236

70 Durometer Buna-N O-Ring, Inch OD, 3-3/4 Inch ID, 0.10 Inch Width

A-154 70 Durometer Buna-N O-Ring

154

70 Durometer Buna-N O-Ring, Inch OD, 3-1/8 Inch ID, 0.21 Inch Width

A-338 70 Durometer Buna-N O-Ring

338

70 Durometer Buna-N O-Ring, Inch OD, 2-1/2 Inch ID, 0.07 Inch Width

A-037 70 Durometer Buna-N O-Ring

37

2-1/2 in

70 Durometer Buna-N O-Ring, Inch OD, 2-3/8 Inch ID, 0.07 Inch Width

A-036 70 Durometer Buna-N O-Ring

36

70 Durometer Buna-N O-Ring, Inch OD, 4-3/4 Inch ID, 0.28 Inch Width

A-427 70 Durometer Buna-N O-Ring

427

70 Durometer Buna-N O-Ring, Inch OD, 1-7/8 Inch ID, 0.07 Inch Width

A-032 70 Durometer Buna-N O-Ring

32

70 Durometer Buna-N O-Ring, Inch OD, 5-3/4 Inch ID, 0.28 Inch Width

A-435 70 Durometer Buna-N O-Ring

435

70 Durometer Buna-N O-Ring, Inch OD, 2-1/8 Inch ID, 0.14 Inch Width

A-227 70 Durometer Buna-N O-Ring

227

2-1/8 in

70 Durometer Buna-N O-Ring, Inch OD, 3/4 Inch ID, 0.10 Inch Width

A-116 70 Durometer Buna-N O-Ring

116

3/4 in

70 Durometer Buna-N O-Ring, Inch OD, 1-3/16 Inch ID, 0.21 Inch Width

A-321 70 Durometer Buna-N O-Ring

321

1-3/16 in

70 Durometer Buna-N O-Ring, Inch OD, 4-1/4 Inch ID, 0.21 Inch Width

A-347 70 Durometer Buna-N O-Ring

347

70 Durometer Buna-N O-Ring, Inch OD, 5-1/2 Inch ID, 0.10 Inch Width

A-161 70 Durometer Buna-N O-Ring

161

70 Durometer Buna-N O-Ring, Inch OD, 7/16 Inch ID, 0.14 Inch Width

A-205 70 Durometer Buna-N O-Ring

205

0.44 in

ORING OD 7/8 W 1/16

568-018

18

3/4 in

ORING 5-3/4 ID X 6-1/8 OD

568-359

359

ORING 6X6-3/8X16

568-361

361

ORING OD 7/32 W 1/16

A-004

04

0.08 in

SUNSHINE ORING

A-046

46

ORing 5-1/4 ID X 5-3/8OD

A-050

50

ORING 3/32 X5/32 X11/32

A-105

105

0.16 in

ORING OD 5-15/16 W 3/32

A-162

162

ORING OD 9-1/2 W 1/8

A-271

271

ORING 15 ID X15-1/4

A-281

281

ORING OD 1/2 W 3/16

A-310-ORING

310

1/2 in

HERCULES ORING OD 4-3/8 W 3/16

A-345-HERCULES

345

ORING

A-376

376

9-3/4 in

ORING 10 ID X 10-3/8 OD

A-377

377

ORING

A-392

392

ORING OD 5-5/8 W 1/4

A-430

430

ORING OD 5-3/4 W 1/4

A-431

431

Product Questions & Answers (2)

Question by: Ross J on Mar 3, 2026, 6:00 AM
What size groove does this O-ring fit, if I'm replacing one?
Answer by: Customer Support on Mar 4, 2026, 12:46 PM
For standard -364 grooves, this O-ring should work without issue.
Question by: Dwight J on Jul 1, 2025, 6:18 PM
Got a cylinder on a big press that takes a -364 o-ring. These come in a 4-pack, right? Just want to make sure I'm ordering enough to have a spare or two on hand.
Answer by: Customer Support on Jul 3, 2025, 2:46 PM
sold in a package of 4. So you'll have the one you need plus a few extras sitting on the shelf for next time. The dash size is -364 with a 6.725 inch ID, 7.145 inch OD, and a 0.21 inch cross-section, so as long as your groove is cut for a standard -364, these should drop right in.

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