Lubrication is what makes torque predictable. PCC-1-2026 Section 8 asks for it whatever tightening method is used. Here is how to apply it. A printable PDF (PB-TD-218) is below. Values are for reference; confirm against the current edition of the governing standard. Send us your bolting list for a quote or call (281) 581-0176.
Related: Nut Factor (K) Guide · Coatings for Bolting · All technical docs
Where to apply
- On all working surfaces: stud threads, nut threads, nut bearing faces and washer faces.
- Fill the threads from root to crest at both ends of the stud.
- Carry it past the point where the nut will sit, so the nut runs on lubricated thread the whole way.
- A small bead of excess should be visible once the nut is on.
Where not to apply
- Not on the gasket.
- Not on the flange gasket seating surfaces.
- No grease or tape across the sealing face to hold the gasket in place (Sec. 7).
Choosing a lubricant
- Use a lubricant compatible with the process fluid and the bolting material.
- Its maximum temperature rating does not predict nut factor or disassembly (App K).
- Use the nut factor that matches the lubricant and coating in your torque calculation. See the Nut Factor (K) Guide.
References: ASME PCC-1-2026, Guidelines for Pressure Boundary Bolted Flange Joint Assembly. Summaries are paraphrased; clause numbers refer to ASME PCC-1-2026 unless noted. Patriot Bolt manufactures bolting and does not perform bolting, training or joint assembly services.