Zinc Plated & Hot Dip Galvanized Double End Stud Bolts — Grade 8.8 Carbon Steel, SS304 / SS316 / SS316L, M8–M64
Double ended stud bolts in carbon steel grade 8.8 with zinc plating and stainless steel SS304, SS316 and SS316L, full threaded M8 to M64.
Grade 8.8 Double Ended Stud Bolt
,SS316L Stainless Steel Threaded Rod
,Zinc Plated Corrosion Resistant Stud
Fully threaded double end stud bolts supplied in four material families — carbon steel class 8.8, stainless SS304, SS316 and low-carbon SS316L — with four coating options matched to the corrosion class of the job. Both ends are rolled to ASME B18.31.2, DIN 976, DIN 975, ISO and GB, giving a continuous uninterrupted thread over the full stud length for flange, valve and structural assembly. Diameters run from M8 to M64 with cut-to-order lengths up to 3000 mm.
| Material | Grade / Class | Standard reference | Finish | Typical Application |
|---|---|---|---|---|
| Carbon Steel | Class 8.8 (also 4.8 / 5.8 / 10.9 / 12.9 on request) | ISO 898-1 | Zinc plated (clear / blue / yellow / black), HDG, PTFE, Xylan, plain | Structural steel, machinery, general assembly |
| Stainless Steel SS304 | A2-70 | ISO 3506-1 (A193 B8 equivalent on request) | Passivated, plain | Food, chemical, general corrosion service |
| Stainless Steel SS316 | A4-70 | ISO 3506-1 (A193 B8M equivalent on request) | Passivated, plain | Marine, offshore, chloride environments |
| Stainless Steel SS316L | A4L-70 | ISO 3506-1 | Passivated, plain | Welded assemblies, petrochemical, low-carbon requirement |
- Grade 8.8 tensile strength – 800 MPa nominal tensile, 640 MPa yield, suitable for preloaded flange joints.
- Four coating routes in one part number — zinc, HDG, PTFE and Xylan, so one supplier covers indoor assembly, coastal structures and high-temperature flanges
- HDG to 55–85 μm — measured and reported per batch, suitable for C4/C5 outdoor and coastal service
- De-embrittlement after plating — electroplated class 10.9 and above are baked at 200–230 °C for 4 hours, with records available on request
- Rolled full-length thread — stronger root than cut thread, smooth nut run-on, no thread damage during installation
- Correct nut pairing — class 8 hex nuts (ISO 4032) or ASTM A563 Gr. C for carbon steel; A194 8 / 8M for stainless grades
- 100% dimensional inspection — go/no-go gauged, tensile tested and salt spray sampled on every production lot
- Full document pack — EN 10204 3.1 mill certificate, heat number traceability, coating thickness report, salt spray report
Specifications
| Standard | ASME B18.31.2, DIN 976 (stud) / DIN 975 (threaded rod), ISO, JIS, GB |
| Diameter | M8 – M64 (also 1/4" – 2-1/2") |
| Length | 20 – 3000 mm, cut to order; available length varies by diameter — confirmed at quotation |
| Thread | Metric coarse / fine, UNC, UNF, BSW, BSP |
| Material | Carbon steel class 8.8; stainless SS304 / SS316 / SS316L |
| Finish | Zinc plated, plain, passivated, black oxide, HDG, PTFE, Xylan |
| Tolerance | 6g / 6H, go and no-go gauge verified |
| Accessories | Class 8 hex nuts (ISO 4032) / ASTM A563 Gr. C; A194 8 / 8M for stainless; plain and spring washers |
Pipeline flanges and valves, pressure vessels, steel structures and towers, wind power, oil and gas skids, petrochemical plants, bridge and tunnel construction, heavy machinery and automotive assembly. For offshore and coastal projects specify HDG, SS316 or SS316L; for high-temperature flange service see our PTFE / Xylan coated A193 B7 stud bolts.
Bulk in export cartons on plywood pallets, or packed per customer request. Standard lead time 8–20 days after order confirmation; stock sizes ship within 3 working days. Trade terms FOB, CIF, CFR, EXW, DDP.
Send us your drawing, standard and material grade – we will quote the exact stud bolt specification within 24 hours.
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