This information was borrowed from the Taylor-Wharton web site.

Small Intermediate Industrial High Pressure Cylinders
Model DOT Specification Tapping Nominal Dimensions Water Volume Service Pressure Test Pressure
I.D. O.D. Length Weight
( inches ) ( inches ) ( inches ) ( lbs.) ( cu. in. ) ( psi ) ( psi )
( mm ) ( mm ) ( mm ) ( kg ) ( liters ) ( bar ) ( bar )
20 CF 3AA2015 3/4-14 NGT 5.013 5.263 13.750 10.5 220 2015 3360
127 134 349 4.8 3.6 138.9 231.7
40 CF 3AA2015 3/4-14 NGT 6.670 7.000 17.400 23.5 490 2015 3360
169 178 442 10.7 8.0 138.9 231.7
55 CF 3AA2015 3/4-14 NGT 6.670 7.000 22.625 29.0 670 2015 3360
169 178 575 13.2 11.0 138.9 231.7
80 CF 3AA2015 3/4-14 NGT 6.626 7.000 32.375 46.5 1010 2015 3360
168 178 822 21.1 16.6 138.9 231.7
110 CF 3AA2015 3/4-14 NGT 6.626 7.000 43.000 58.0 1360 2015 3360
168 178 1092 26.3 22.3 138.9 231.7
125 CF 3AA2265 3/4-14 NGT 6.626 7.000 43.000 58.0 1360 2265 3775
168 178 1092 26.3 22.3 156.2 260.3
150 CF 3AA2015+ 3/4-14 NGT 7.045 7.375 46.563 61.0 1660 2015 3360
179 187 1183 27.7 27.2 138.9 231.7


Large Industrial High Pressure Cylinders
Model DOT Specification Tapping Nominal Dimensions Water Volume Service Pressure Test Pressure
I.D. O.D. Length Weight
( inches ) ( inches ) ( inches ) ( lbs.) ( cu in.) ( psi ) ( psi )
( mm ) ( mm ) ( mm ) ( kg ) ( liters ) ( bar ) ( bar )
220 CF 3AA2015 3/4-14 NGT 8.50 9.00 51.00 113 2640 2015 3360
216 229 1295 51 43 138.9 231.6
250 CF 3AA2265 3/4-14 NGT 8.50 9.00 51.00 117 2640 2265 3775
216 229 1295 53 43 156.1 260.2
300 CF 3AA2400 3/4-14 NGT 8.75 9.25 55.00 139 2990 2400 4000
222 235 1397 63 49 165.4 275.7
400 CF 3AA2400 3/4-14 NGT 10.00 10.625 56.00 191 3985 2400 4000
254 270 1422 87 65 165.4 275.7
3500 PSI 3AA3500 3/4-14 NGT 8.50 9.25 51.00 188 2640 3500 5835
216 235 1295 85 43 241.3 402.3
3600 PSI 3AA3600 3/4-14 NGT 8.50 9.25 51.00 188 2640 3600 6000
216 235 1295 85 43 248.2 413.7



Different Companies Cylinder Size Conversion Chart
This information was borrowed from the Wright Brothers, Inc. web site.

Size (inches) DOT Number Airgas Airco Air
Products		 Praxair Scott Matheson MG
Industries
9x60 3AA2400 300 300 A T K 1L 300
9x56 3AA2265 or 3AA2015 200 200 B K A 1A 200
8-1/2x31 3AA2015 80 80 C Q B 2 80
6x24 3AA2015 35 30 D1 G C 3 35
4x20 3AA2015 10 12 D F D 4 10
4x15 3AA2015 7 6       6 7
2x15 3E1800 LB 2 LB LB LB LB LB
2x16 3E1800 LX 7X LG ELB   7X LB
41/2x31 3AA2015 E E Med.E ANE ER   E
12x8 8AL 380 5 A Lab380 XF 1B 380
15x48 48A240 350   A1 FX XL 1F 350
15x52 4AA480 150 150 AA FA XG 1K 150
10x53 48A300 65   A3 FC XP 1J 65
9x16-1/2 39NRC D227 212L   TAP Scotty III   Maxicyl
12-1/2x18-1/2 48A240 25           25
8x53 3AL2015 150A 150A B(AL) ALS Al 1R ISOAL
7x38 3AL2216 80A 80A C(AL) ALQ BL 2R 8OAL
7x21 3AL2216 33A 30A DL(AL) ALH CL 3R 33AL