Fasteners for the oil industry

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ASTM A193 grade B8 class 1

Hex bolts and stud bolts complete with 2 x flat washers & 2 nuts

1. Quantity 216-off, 5/8” B8 class 1, length across flanges 61mm
2. Quantity 96-off, 5/8” B8 class 1, length across flanges 117mm
3. Quantity 280-off, 3/4” B8 class 1, length across flanges 67mm
4. Quantity 56-off, 3/4” B8 class 1, length across flanges 126mm
5. Quantity 272-off, 3/4” B8 class 1 - length across flanges 72mm
6. Quantity 16-off, 3/4” B8 class 1, length across flanges 113mm
7. Quantity 96-off, 3/4” B8 class 1, length across flanges 138mm
8. Quantity 312-off, 7/8” B8 class 1, length across flanges 75mm
9. Quantity 204-off, 7/8” B8 class 1, length across flanges 78mm

Notes:

I have indicated distance between flanges, please add additional bolt/stud length allowance for the thickness of nuts & washers e.g., 61mm + thickness of nuts & washers. Also, please can you include option with nylock nuts.

We are utilizing ASME B31.1 pipework (ANSI 150 flanges, 4”, 6”, 8”, 10” & 12”) for our rubber lined pipework. Issue we need minimize bolt torques applied as our maximum flange surface pressure preferred with rubber lining is quite low. We also have stipulation need torque to at least 35% of bolt yield strength. I believe our best/lowest yield strength bolt option B8 class 1?