Stud Bolt Chart for ASME B16.5 Flanges
This chart lists the number, diameter and length of stud bolts for every ASME B16.5 flange from Class 150 to Class 2500, for raised-face and ring-joint facings. Each stud is used with two heavy hex nuts.
Teshi Group manufactures stud bolts as an OEM in ASTM A193 B7, B7M, B16, B8 and B8M with A194 2H, 2HM, 8 and 8M nuts, cut to these lengths and supplied plain, galvanised or PTFE coated.
Stud Bolt Chart for ASME B16.5 Flanges — tables
Class 150 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ½" | 55 | — |
| ¾" | 4 | ½" | 65 | — |
| 1" | 4 | ½" | 65 | 75 |
| 1¼" | 4 | ½" | 70 | 85 |
| 1½" | 4 | ½" | 70 | 85 |
| 2" | 4 | ⅝" | 85 | 95 |
| 2½" | 4 | ⅝" | 90 | 100 |
| 3" | 4 | ⅝" | 90 | 100 |
| 3½" | 8 | ⅝" | 90 | 100 |
| 4" | 8 | ⅝" | 90 | 100 |
| 5" | 8 | ¾" | 95 | 110 |
| 6" | 8 | ¾" | 100 | 115 |
| 8" | 8 | ¾" | 110 | 120 |
| 10" | 12 | ⅞" | 115 | 125 |
| 12" | 12 | ⅞" | 120 | 135 |
| 14" | 12 | 1" | 135 | 145 |
| 16" | 16 | 1" | 135 | 145 |
| 18" | 16 | 1⅛" | 145 | 160 |
| 20" | 20 | 1⅛" | 160 | 170 |
| 24" | 20 | 1¼" | 170 | 185 |
Class 300 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ½" | 65 | 75 |
| ¾" | 4 | ⅝" | 75 | 90 |
| 1" | 4 | ⅝" | 75 | 90 |
| 1¼" | 4 | ⅝" | 85 | 95 |
| 1½" | 4 | ¾" | 90 | 100 |
| 2" | 8 | ⅝" | 90 | 100 |
| 2½" | 8 | ¾" | 100 | 115 |
| 3" | 8 | ¾" | 110 | 120 |
| 3½" | 8 | ¾" | 110 | 125 |
| 4" | 8 | ¾" | 115 | 125 |
| 5" | 8 | ¾" | 120 | 135 |
| 6" | 12 | ¾" | 120 | 140 |
| 8" | 12 | ⅞" | 140 | 150 |
| 10" | 16 | 1" | 160 | 170 |
| 12" | 16 | 1⅛" | 170 | 185 |
| 14" | 20 | 1⅛" | 180 | 190 |
| 16" | 20 | 1¼" | 190 | 205 |
| 18" | 24 | 1¼" | 195 | 210 |
| 20" | 24 | 1¼" | 205 | 220 |
| 24" | 24 | 1½" | 230 | 255 |
Class 600 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ½" | 75 | 75 |
| ¾" | 4 | ⅝" | 90 | 90 |
| 1" | 4 | ⅝" | 90 | 90 |
| 1¼" | 4 | ⅝" | 95 | 95 |
| 1½" | 4 | ¾" | 110 | 110 |
| 2" | 8 | ⅝" | 110 | 110 |
| 2½" | 8 | ¾" | 120 | 120 |
| 3" | 8 | ¾" | 125 | 125 |
| 3½" | 8 | ⅞" | 140 | 140 |
| 4" | 8 | ⅞" | 145 | 145 |
| 5" | 8 | 1" | 165 | 165 |
| 6" | 12 | 1" | 170 | 170 |
| 8" | 12 | 1⅛" | 190 | 195 |
| 10" | 16 | 1¼" | 215 | 215 |
| 12" | 20 | 1¼" | 220 | 220 |
| 14" | 20 | 1⅜" | 235 | 235 |
| 16" | 20 | 1½" | 255 | 255 |
| 18" | 20 | 1⅝" | 275 | 275 |
| 20" | 24 | 1⅝" | 285 | 290 |
| 24" | 24 | 1⅞" | 330 | 335 |
Class 900 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ¾" | 110 | 110 |
| ¾" | 4 | ¾" | 115 | 115 |
| 1" | 4 | ⅞" | 125 | 125 |
| 1¼" | 4 | ⅞" | 125 | 125 |
| 1½" | 4 | 1" | 140 | 140 |
| 2" | 8 | ⅞" | 145 | 145 |
| 2½" | 8 | 1" | 160 | 160 |
| 3" | 8 | ⅞" | 145 | 145 |
| 4" | 8 | 1⅛" | 170 | 170 |
| 5" | 8 | 1¼" | 190 | 190 |
| 6" | 12 | 1⅛" | 190 | 195 |
| 8" | 12 | 1⅜" | 220 | 220 |
| 10" | 16 | 1⅜" | 235 | 235 |
| 12" | 20 | 1⅜" | 255 | 255 |
| 14" | 20 | 1½" | 275 | 280 |
| 16" | 20 | 1⅝" | 285 | 290 |
| 18" | 20 | 1⅞" | 325 | 335 |
| 20" | 20 | 2" | 350 | 360 |
| 24" | 20 | 2½" | 440 | 455 |
Class 1500 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ¾" | 110 | 110 |
| ¾" | 4 | ¾" | 115 | 115 |
| 1" | 4 | ⅞" | 125 | 125 |
| 1¼" | 4 | ⅞" | 125 | 125 |
| 1½" | 4 | 1" | 140 | 140 |
| 2" | 8 | ⅞" | 145 | 145 |
| 2½" | 8 | 1" | 160 | 160 |
| 3" | 8 | 1⅛" | 180 | 180 |
| 4" | 8 | 1¼" | 195 | 195 |
| 5" | 8 | 1½" | 250 | 250 |
| 6" | 12 | 1⅜" | 260 | 265 |
| 8" | 12 | 1⅝" | 290 | 300 |
| 10" | 12 | 1⅞" | 335 | 345 |
| 12" | 16 | 2" | 375 | 385 |
| 14" | 16 | 2¼" | 405 | 425 |
| 16" | 16 | 2½" | 445 | 470 |
| 18" | 16 | 2¾" | 495 | 525 |
| 20" | 16 | 3" | 540 | 565 |
| 24" | 16 | 3½" | 615 | 650 |
Class 2500 stud bolts
| NPSin | No. of studs | Stud diain | LengthRaised face, mm | LengthRing joint, mm |
|---|---|---|---|---|
| ½" | 4 | ¾" | 120 | 120 |
| ¾" | 4 | ¾" | 125 | 125 |
| 1" | 4 | ⅞" | 140 | 140 |
| 1¼" | 4 | 1" | 150 | 150 |
| 1½" | 4 | 1⅛" | 170 | 170 |
| 2" | 8 | 1" | 180 | 180 |
| 2½" | 8 | 1⅛" | 195 | 205 |
| 3" | 8 | 1¼" | 220 | 230 |
| 4" | 8 | 1½" | 255 | 260 |
| 5" | 8 | 1¾" | 300 | 310 |
| 6" | 8 | 2" | 345 | 355 |
| 8" | 12 | 2" | 380 | 395 |
| 10" | 12 | 2½" | 490 | 510 |
| 12" | 12 | 2¾" | 540 | 560 |
Notes
- Lengths are in millimetres for a 2 mm raised face (Class 150 and 300) or 7 mm raised face (Class 600 and above), and for ring-joint flanges with the standard ring.
- Stud lengths are those tabulated in ASME B16.5 and do not include the height of the points.
- Different lengths are needed for lap joint flanges, for spectacle blinds or orifice plates in the joint, and when bolt tensioners are used.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
Stud bolt chart for ASME B16.5 flanges: common questions
How many stud bolts does a 6 inch Class 300 flange need?
Twelve stud bolts of ¾" diameter, 120 mm long for a raised-face joint, each with two heavy hex nuts.
Does stud bolt length include the nuts?
The tabulated length allows for two heavy hex nuts, the two flange thicknesses, the raised faces and the gasket. It excludes the point at each end of the stud.
Related products, data sheets and standards
Stud Bolts & Heavy Hex Nuts
OEM manufacturer
View online · PDFASME B16.5ASME B16.5 Class 150 flange dimensions
Class 150 weld neck, slip-on, blind, socket weld, threaded and lap joint flange dimensions, NPS ½–24, in mm.
View online · PDFASME B16.5ASME B16.5 Class 300 flange dimensions
Class 300 flange outside diameter, thickness, hub and drilling dimensions, NPS ½–24, in mm.
View online · PDFOEM manufacturerFasteners
M10–M64 · ½"–4" · Alloy / SS
OpenOEM manufacturerIndustrial Flanges
NPS ½"–60" · CS / SS / Alloy
Open
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