This engine bolt set is specifically designed for the 1967–1968 Triumph 650 TR6R and T120R models. It provides all the essential hardware needed to join the crankcase halves and secure related engine components, ensuring both structural integrity and an authentic restoration.
Key Features
- Authenticity: All hardware is manufactured to original Triumph specifications, ensuring a precise fit and period-correct appearance.
- Application: Designed for joining the crankcase halves and securing the rear castings above the primary chaincase.
- Material: Typically supplied in steel with a protective zinc finish for durability and corrosion resistance.
Thread Types: Includes both 26 TPI (CEI) and 22 TPI (BSF/UNF) threads, matching the original Triumph hardware requirements for this era.
Set Composition
- 2 x 70-2888 Stud 3-7/8″ x 5/16-26 TPI
- 1 x 70-4856 Stud 5-1/16″ x 5/16-26 TPI
- 1 x 70-5963 Stud 4-3/4″ x 5/16-26 TPI
- 1 x 70-4541 Bolt 2-1/2″ x 5/16-22 TPI
- 1 x 70-4540 Bolt 1-3/4″ x 5/16-22 TPI
- 1 x 70-4098 Bolt 1-7/8″ x 5/16-22 TPI
- 1 x 70-4542 Stud 3/8 – 20/16 x 4 1/21
- 1 x 70-6929 Bolt 4-1/2″ x 3/8″
- 10 x S1-51 Nuts 5/16-26 TPI
- 13 x S25-3 5/16″ Plain washers
- 2 x S25-2 Plain Washers 3/8″
- 1 x PO172A Nut 3/8″-26 TPI
Notes on Use
- The longest stud (5-1/16″) is typically used at the front of the crankcase and also serves as a mounting point for exhaust pipe stays on models with downswept exhaust headers.
- The included nuts and washers are designed to work with the supplied studs and bolts, ensuring secure assembly and proper load distribution.
- Always refer to your workshop manual for correct installation procedures and torque specifications.
Typical Applications
- Models: Triumph 650 TR6R, T120R (1967–1968)
- Function: Crankcase assembly, engine mounting, and exhaust stay attachment
- Why Use a Complete Bolt Set?
- Restoration Quality: Ensures correct fit and finish, preserving the value and reliability of your classic Triumph.
- Convenience: All necessary hardware is included, eliminating the need to source individual pieces.
- Safety: Replacing old or corroded fasteners reduces the risk of engine failure due to hardware fatigue or mismatch.
Part Number, Description, Typical Use
- 70-5963 4-3/4″ x 5/16-26 TPI stud Crankcase, exhaust stay
- 70-4856 5-1/16″ x 5/16-26 TPI stud Front crankcase, exhaust stay
- 70-2888 3-7/8″ x 5/16-26 TPI stud Crankcase
- 70-4541 2-1/2″ x 5/16-22 TPI bolt Crankcase top
- 70-4540 1-3/4″ x 5/16-22 TPI bolt Crankcase
- 70-4098 1-7/8″ x 5/16-22 TPI bolt Small hex, crankcase
- S1-51 5/16-26 TPI nut Stud/bolt fastening
- S25-3 5/16″ plain washer Under nuts/bolts
Always verify compatibility with your specific engine before installation.
