Welded Bellows Specs

Complete AT-Series welded bellows specification catalog — 248 standard models from 10mm to 1,200mm OD. SS316L, AM350, Hastelloy C-22, and Titanium material options with dimensional data.

Welded Bellows Overview

Alpha Technology is a leading manufacturer of high-performance welded bellows designed for high-vacuum (HV) and ultra-high-vacuum (UHV) applications. Our products are engineered for precision, high cycle life, and reliability in demanding environments such as semiconductor manufacturing, aerospace, and advanced scientific research. For guidance on selecting the right model for your application, refer to our Bellows Design & Selection Guide and Material Selection Guide.

AT-Series Specifications (Full Catalog)

Model O.D (mm) I.D (mm) Model O.D (mm) I.D (mm)
AT-001 10 5 AT-042 31.75 19.05
AT-002 10.5 5 AT-043 31 18
AT-003 12 5 AT-044 31.9 15.8
AT-004 12.5 5 AT-045 31.8 19
AT-005 12.5 7 AT-046 33 22
AT-006 13.5 6 AT-047 33 24
AT-007 15 6.5 AT-048 34 14.2
AT-008 15.1 5.5 AT-049 34 21
AT-009 16.2 8 AT-050 34.2 13.7
AT-010 16.205 8.585 AT-051 35 22
AT-011 17 10 AT-052 36.4 17
AT-012 18 6.5 AT-053 36.7 23
AT-013 18 9 AT-054 37 19
AT-014 18 10.5 AT-055 37.5 26
AT-015 18.5 12.2 AT-056 38.1 25.4
AT-016 20 10 AT-057 39.4 19
AT-017 21 15 AT-058 39.4 26.7
AT-018 21.5 11.5 AT-059 39.4 27
AT-019 24 10 AT-060 39.5 19.8
AT-020 24 12 AT-061 40 22
AT-021 25 10 AT-062 40 25
AT-022 25 15 AT-063 41.275 19.05
AT-023 26 12.7 AT-064 41.5 22
AT-024 26 13.7 AT-065 41.8 31.8
AT-025 26 13.8 AT-066 42 29.6
AT-026 26 13.8 AT-067 42.9 30.15
AT-027 26 14 AT-068 44 28
AT-028 26 15.97 AT-069 44 31
AT-029 26.162 17.5 AT-070 44.2 31
AT-030 26.5 15 AT-071 44.2 28
AT-031 27 14 AT-072 44.4 19
AT-032 28 15 AT-073 44.45 19.05
AT-033 28 13 AT-074 44.5 19
AT-034 28 14.1 AT-075 45 25
AT-035 28.3 14.1 AT-076 45 27
AT-036 28.3 19.05 AT-077 45 30
AT-037 29.87 17.2 AT-078 46 26
AT-038 30 19 AT-079 46 33
AT-039 30 16.6 AT-080 48 31.8
AT-040 30.1 16.9 AT-081 48.5 33.8
AT-041 31.5 16.9 AT-082 49.2 30
Next Series: AT-083 to AT-164
AT-083 49.2 39.3 AT-124 65.3 52.4
AT-084 49.4 36.5 AT-125 66 53.5
AT-085 49.4 37.6 AT-126 67 55
AT-086 49.5 33 AT-127 68 50
AT-087 50 30 AT-128 68.5 55.5
AT-088 50 35 AT-129 70 50
AT-089 50.4 31.8 AT-130 71 55.5
AT-090 50.8 31.6 AT-131 74 46
AT-091 50.8 38.1 AT-132 74.6 61.9
AT-092 51 31.4 AT-133 74.6 61.9
AT-093 51 31.8 AT-134 75 50.8
AT-094 51 40.5 AT-135 76.2 60
AT-095 52 28 AT-136 76.2 50.8
AT-096 52.4 39.6 AT-137 79 63.8
AT-097 52.4 39.6 AT-138 79 49
AT-098 53.8 41.5 AT-139 80 49
AT-099 54 41 AT-140 80 50
AT-100 55 35 AT-141 80 58
AT-101 55 38 AT-142 80 60
AT-102 55.6 42.8 AT-143 80 67
AT-103 57 30 AT-144 81 65
AT-104 57.15 38.1 AT-145 84 65
AT-105 57.15 44.45 AT-146 84 68
AT-106 58.2 46 AT-147 84 71.4
AT-107 58.9 45.05 AT-148 85 63
AT-108 59 39 AT-149 88 66
AT-109 60 40 AT-150 88.5 65
AT-110 60 47 AT-151 88.9 50.8
AT-111 60.32 38.1 AT-152 88.9 63.5
AT-112 61 35 AT-153 90 50
AT-113 61.9 49.1 AT-154 90 55
AT-114 62 24 AT-155 90 58
AT-115 62 34 AT-156 90 65
AT-116 62 50 AT-157 90 68
AT-117 63.35 46 AT-158 90 70
AT-118 63.5 43.5 AT-159 92 56
AT-119 64 34 AT-160 92 76
AT-120 64.5 39 AT-161 92 76.3
AT-121 65 43 AT-162 93.65 63.5
AT-122 65 45 AT-163 95 70
AT-123 65.07 52.37 AT-164 95 73
Next Series: AT-165 to AT-248
AT-165 98.43 81.74 AT-207 177 126.5
AT-166 100 65 AT-208 180 140
AT-167 100 75 AT-209 180 150
AT-168 100 80 AT-210 180 167
AT-169 102 85.95 AT-211 185 135
AT-170 104.7 87.8 AT-212 185 150
AT-171 105 75 AT-213 190 150
AT-172 105 80 AT-214 190 164.4
AT-173 107.95 91.9 AT-215 200 160
AT-174 108 80 AT-216 200 167
AT-175 115 85 AT-217 200 170
AT-176 115 98.5 AT-218 200 177
AT-177 119 89 AT-219 208 180
AT-178 120 80 AT-220 209.55 190.5
AT-179 120 90 AT-221 210 171
AT-180 120 95 AT-222 215 180
AT-181 120.8 101.6 AT-223 218 190
AT-182 123.78 104.8 AT-224 218 198
AT-183 124.5 89 AT-225 221 196
AT-184 125 95 AT-226 227 192
AT-185 125 102 AT-227 235 200
AT-186 125 108 AT-228 241.6 215.6
AT-187 130 90 AT-229 250 215
AT-188 130 110 AT-230 254 224
AT-189 132 102 AT-231 270 216
AT-190 140 95 AT-232 270 230
AT-191 140 110 AT-233 285 252
AT-192 140 120 AT-234 290 265
AT-193 145 110 AT-235 310 280
AT-194 148 125 AT-236 350 300
AT-195 147 131 AT-237 364 320
AT-196 150 110 AT-238 380 340
AT-197 150 120 AT-239 400 360
AT-198 150 125 AT-240 400 390
AT-199 157 127 AT-241 490 400
AT-200 158.7 115 AT-242 500 460
AT-201 160 120 AT-243 534 494
AT-202 160 130 AT-244 660 610
AT-203 162 142 AT-245 800 720
AT-204 165 135 AT-246 950 750
AT-205 169 149 AT-247 1000 800
AT-206 170 140 AT-248 1200 900

Material Selection Guide

Material Key Characteristics Temperature Range Magnetic
316L Stainless Steel Standard vacuum material, excellent weldability and corrosion resistance. -269°C to 400°C No
AM-350 High strength and high fatigue resistance for long-stroke applications. -269°C to 427°C Yes
Hastelloy C-22 Ultimate resistance to aggressive chemicals and oxidation. -269°C to 600°C No
Titanium (Gr. 2) High strength-to-weight ratio and fully non-magnetic. -269°C to 450°C No
* Custom dimensions and specialized flange configurations are available upon request. Explore our Process & Design page to understand our engineering workflow.

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