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GB Stud Hole Fitting Flange Protectors


Suitable for high-face flanges.
Quick fitting. Simply insert plugs into the bolt holes.
Will not tear or crack. Weather and petroleum resistant.
Size: DN10 to DN600
Material: LDPE, low density polyethylene
Standard Color: Blue
Standards: GB, GOST, DIN.
Custom-made: Resistant to temperatures from -50 degrees C to +60 degrees C.UV-stabilised.

DN d1 d2 Hole
10 60 42 14
15 65 50 14
20 75 60 14
25 85 70 14
32 100 82 18
40 110 90 18
50 125 104 18
65 145 125 18
80 160 139 18
100-6 170 151 18
100 180 164 18
105-25.40 190 166 23
125-6 200 179 18
125 210 189 18
125-25.40 220 194 26
150-6 225 204 18
150 240 214 23
150-25.40 250 223 26
200 295 271 23
200-25 310 283 26
250-10 350 324 23
DN d1 d2 Hole
250-16 355 326 26
250-25 370 336 30
300-10 400 368 23
300-16 410 376 26
300-25 430 395 30
350-10 460 433 23
350-16 470 439 26
400-10 515 487 26
400-16 525 490 30
450-10 565 537 26
450-16 585 550 30
500-10 620 590 26
500-16 650 613 34
600-10 725 690 30
600-16 770 723 36


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