ISO B Industrial Working and Burst Pressures| Body Size | Steel Working PSI | Steel Burst PSI | Brass Working PSI | Brass Burst PSI | | 1/8 | 4,000 | 14,500 | 3,000 | 16,500 | | 1/4 | 5,000 | 22,500 | 3,000 | 15,000 | | 3/8 | 4,000 | 16,500 | 3,000 | 12,000 | | 1/2 | 4,000 | 16,000 | 2,500 | 11,500 | | 3/4 | 4,000 | 16,500 | 2,000 | 12,000 | | 1 | 4,000 | 16,000 | 1,500 | 8,500 | | 1-1/4 | 2,500 | 10,000 | 1,000 | 6,500 | | 1-1/2 | 2,500 | 12,500 | 1,000 | 6,500 | | 2-1/2 | 1,500 | 6,000 | 700 | 5,500 | | | | | | | | Body Size | 303 Stainless Working PSI | 303 Stainless Burst PSI | 316 Stainless Working PSI | 316 Stainless Burst PSI | | 1/8 | 3,500 | 29,000 | 3,500 | 29,500 | | 1/4 | 3,500 | 31,500 | 3,500 | 33,000 | | 3/8 | 3,500 | 26,500 | 3,500 | 28,000 | | 1/2 | 3,500 | 27,500 | 3,500 | 22,000 | | 3/4 | 3,000 | 16,000 | 3,000 | 21,500 | | 1 | 2,000 | 15,000 | 2,000 | 15,000 | | 1-1/4 | 2,000 | 10,000 | 1,000 | 8,500 | | 1-1/2 | 1,500 | 8,500 | 1,000 | 7,000 | | 2-1/2 | 1,000 | 6,500 | 900 | 6,000 |
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