Products
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