Alloy steel stainless steel stud nut
（等长）双头螺柱GB 897~901
腰状杆螺柱连接副 螺柱GB/T 13807.2
PN16.0~32.0MPa（阶段）双头螺柱JB/T 2773~2774
压力容器（法兰）用等长双头螺柱JB1164，JB/T 4707
管法兰用螺柱SH 3404，HG 20613（欧系），HG 20634（美系），HGJ 75
（拧入或管道用）双头螺柱 H 15~16
火力发电厂高温紧固件DL 439
Details
Standard | Material Type & Grade | Normal Size (in.) | Length | Screw Thread | Mechanical Requirement | |||||
σb (MPa) | σ0.2 (MPa) | δ4 (%) | ψ (%) | Hardness | ||||||
ASME/ANSI B 16.5 ASME/ANSI B 18.2.1 ASME/ANSI B 1.1 | A 193 | B7 | ≤2.5 | According to order | UNC, 8UN Accuracy of thread Grade 2A | ≥860 | ≥725 | 16 | 50 | ≤HB321 |
B7M | ≤2.5 | ≥690 | ≥550 | 18 | ≤HB235 | |||||
B16 | ≤2.5 | ≥860 | ≥725 | ≤HB321 | ||||||
B8/B8M/B8C/B8T (CL. 1) | All diameters | ≥515 | ≥205 | 30 | 50 | ≤HB223 | ||||
B8/B8C/B8T (CL. 2) | ≤0.75 | ≥860 | ≥690 | 12 | 35 | ≤HB321 | ||||
＞0.75~1 | ≥795 | ≥550 | 15 | |||||||
＞1~1.25 | ≥725 | ≥450 | 20 | |||||||
＞1.25~1.5 | ≥690 | ≥345 | 28 | 45 | ||||||
B8M (CL. 2) | ≤0.75 | ≥760 | ≥655 | 15 | 45 | |||||
＞0.75~1 | ≥690 | ≥550 | 20 | |||||||
＞1~1.25 | ≥655 | ≥450 | 25 | |||||||
＞1.25~1.5 | ≥620 | ≥345 | 30 | |||||||
A 453 | 660 B | All diameters | ≥895 | ≥585 | 15 | 18 | HB248~341 | |||
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