| Standard | ASTM A193 / ASME B18.31.2 dimensional reference · A193M Grade B16 |
|---|---|
| Material | ASTM A193/A193M Grade B16 chromium-molybdenum-vanadium alloy steel, quenched and tempered |
| Strength Grade | B16 |
| Size Range | M12 and above / 1/2 in and above |
| Surface Treatment | Plain / Black Oxide / Phosphate / Project-Approved High-Temperature Coating |
Product Description
We manufacture ASTM A193/A193M Grade B16 stud bolts from chromium-molybdenum-vanadium alloy steel bar, quenched and tempered, in metric sizes from M12 and imperial sizes from 1/2 in, with lengths to your drawing. They are made for steam piping, valves, turbine casings, boiler and heat-recovery equipment, hot process flanges and pressure vessels, where your specification calls for B16.
B16 is not a stronger B7. Room-temperature tensile and yield can match B7 in some diameter ranges. B16’s chemistry and heat treatment are for creep and stress-relaxation resistance at temperature. Please send us the design code, allowable-stress table, service temperature and exposure time so we can confirm the grade before production.
Matching nuts: we supply A194 Grade 7 and ship the studs and nuts as one set, with one set of documents. For assemblies in service, we confirm thread series, coating, high-temperature lubricant and tightening method with you before production.
What ships with every order
Made to order. B16 studs are not a stock item for most sizes. Typical lead time is 15–30 days; we confirm the lead time when we quote.
To quote quickly, send us: diameter, length, thread, service temperature, nut grade, coating, marking and documentation requirements. We quote within one working day.
| Product type | ASTM A193 Grade B16 high-temperature stud bolts |
|---|---|
| Material standard | ASTM A193/A193M Grade B16 |
| Material family | Quenched and tempered chromium-molybdenum-vanadium alloy steel |
| Common nut pairing | ASTM A194 Grade 7 heavy hex nuts where approved by code and project |
| Size range | M12 and above / 1/2 in and above |
| Length | Made to the customer drawing or project specification |
| Lead time | Made to order; typically 15–30 days, confirmed with quotation |
| Thread and dimensions | UNC / 8UN / metric; ASME B18.31.2 or customer drawing as applicable |
| Surface condition | Plain / Black oxide / Phosphate / Project-approved high-temperature coating |
| Temperature boundary | Determined from governing code allowables, pressure, exposure time and joint design; no single universal ASTM A193 service limit |
| Documentation | Material test certificate with heat number, hardness and dimensional reports, and certificate of conformity with every order; third-party inspection accepted before shipment |
Manufacturing
Selection
B16 studs are used for steam valves, piping flanges, turbine casings and boiler equipment when sustained-temperature strength and clamp-load retention govern.
Power generation fastenersHot process flanges and pressure closures may specify B16 where code allowables and creep or relaxation behavior make it preferable to B7.
Oil and gas fastenersReview chemistry, diameter-based strength, heat treatment, creep, allowable stress and nut pairing before approving any substitution.
Compare ASTM A193 B7 and B16Assembly
FAQ
Use B16 when the governing code or project specifies it for sustained elevated-temperature service where creep, stress relaxation or high-temperature allowable stress drives selection. Do not choose from a universal temperature cutoff alone.
ASTM A194 Grade 7 heavy hex nuts are a common starting point for B16 systems. The final nut grade must follow the governing code, piping class, temperature and project bill of materials.
No. Geometry may match, but chemistry, heat treatment, diameter-based mechanical properties and elevated-temperature behavior differ. Any substitution requires engineering and purchaser approval.
B16 is alloy steel, not stainless or nickel alloy. Coating or a different bolting alloy must be selected when process or environmental corrosion governs.
Send ASTM edition, diameter, length, thread, design temperature, pressure code or piping class, nut grade, coating, lubricant, test and certificate scope, quantity and delivery requirement.
Send the ASTM edition, design temperature, code, diameter, length, thread, nut grade, coating, lubricant, inspection scope and quantity. We can quote traceable B16 and Grade 7 stud-nut assemblies.
Get engineering support and pricing for this product — our team responds within 24 hours.
