GB3632 Torsion Shear Bolt | TC Bolt for Ship Hull Structure
TheGB3632torsion shear bolt — commonly known as TC Bolt — is a high-strength structural fastener engineered for ship hull framing, transverse bulkhead assembly, and deck-to-beam connections. Its defining feature is the splined shear-off tip that fractures at a factory-calibrated torque, giving the installer instant visual proof that every GB3632torsion shear bolt has reached design preload — no torque wrench required.
TheTorsion Shear Bolt Hexagonal head accepts standard heavy-duty sockets for rapid pneumatic installation, while the spline end is gripped by a dedicated shear wrench. When the calibrated torque is reached, the spline shears clean — confirming the assembled boltnut joint meets the specified clamping force. This eliminates guesswork and is the preferred TC Bolt method for classification society surveyed ship structures.
| Product Name | Torsion Shear Bolt |
| Standard | GB3632 — Torsion Shear Type High Strength Bolt |
| Type | TC Bolt/Torsion Shear Bolt HexagonalHead |
| Size Range | M16, M20, M22, M24, M27, M30 |
| Grade | 10.9S — Heat treated alloy steel |
| Surface Treatment | Plain (black oxide), Hot-Dip Galvanized (HDG), Dacromet |
| Matching Nut | 10H Grade Heavy Hex Nut — complete boltnut set per GB3632 |
| Matching Washer | HRC35-45 Hardened Flat Washer — one under nut, one under bolt head |
| Installation | Electric shear wrench — spline tip shears at calibrated torque for visual verification |
| Application | Torsion shear bolt for ship hull main frame, deck longitudinal, bulkhead stiffener, hatch coaming |
| Inspection | Spline shear witness mark = proof of correct preload; no post-install torque check needed |
For shipyard structural erection, the GB3632torsion shear bolt dramatically reduces quality control inspection time compared to conventional hex bolts — each sheared spline is a permanent installed record. Specify the complete boltnut assembly (bolt + nut + 2 washers per GB3632) for direct procurement. TC Bolt in HDG finish for deck-exposed hull connections; Dacromet option where higher salt spray resistance is needed without the thickness penalty of HDG.
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