Connecting Rod

Connecting Rod Bolt
Sold each - 12 required per engine

Maintain engine reliability during rebuild work with this OE Connecting Rod Bolt. The connecting rod bolt is a critical internal engine fastener used to secure the connecting rod cap to the connecting rod body around the crankshaft journal.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 914 (1970-1976)

Diagram Ref No 20

Although small, this component is subjected to extreme loads every time the engine runs. It must maintain precise clamping force under high RPM, combustion pressure, heat and vibration. For this reason, connecting rod bolts should be treated as essential engine rebuild hardware and replaced whenever the connecting rods are removed or serviced.

What Does a Connecting Rod Bolt Do?

The connecting rod bolt clamps the rod cap securely to the connecting rod.

Its main functions include:

• Securing the connecting rod cap
• Maintaining bearing alignment
• Supporting correct crankshaft rotation
• Preserving bearing crush
• Withstanding high engine loads
• Helping prevent internal engine failure

Correct clamping force is vital for engine durability and safe operation.

Why Do Connecting Rod Bolts Fail?

Connecting rod bolts operate under severe stress and can weaken over time.

Common causes of failure include:

• Metal fatigue
• Overstretching during previous installation
• Incorrect torque procedures
• High RPM engine use
• Heat cycling
• Thread damage
• Reuse during engine rebuilds
• General age and wear

Many connecting rod bolts are considered single-use components and should not be reused once removed.

When Should They Be Replaced?

Replacement is strongly recommended when:

• Rebuilding the engine
• Removing connecting rods
• Replacing big end bearings
• Servicing the crankshaft
• Building a performance engine
• Inspecting high-mileage engines
• Previous torque history is unknown

Replacing rod bolts during rebuild work is inexpensive protection against serious engine damage.

Why Replacement Matters

A failed connecting rod bolt can cause catastrophic engine failure.

Benefits of replacement include:

• Correct clamping force
• Improved engine reliability
• Protection of crankshaft and bearings
• Reduced risk of rod cap movement
• Professional rebuild standards
• Long-term engine durability
• Greater peace of mind

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110317200

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Connection rod bolt.
12 needed per engine.
Price is for each

Fits:
Porsche 911 1970-71

Bolt length - 73mm

Diagram Ref No 21

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110317102

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Connection rod bolt.
12 needed per engine.
Price is for each

Fits:
Porsche 911 1970-71

Bolt length - 73mm

Diagram Ref No 21

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110317102

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Connection rod bolts M10 and nuts.
SET OF 12.

Fits:
Porsche 911TE (1972 - 1973)
Porsche 911TV (1972 - 1973)
Porsche 911TK (1973 - 1973)
Porsche 911S (1970 - 1973)
Porsche RS (1973 - 1973)
Porsche RSR 2.8L (1973 - 1973)
Porsche 911 2.7 (1974 - 1977)
Porsche 911 3.0L Carrera (1976 - 1977)
Porsche 911 SC 3.0L (1978 - 1983)
Porsche 911 Turbo 3.0 (1975 - 1977)

Diagram Ref No 18

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91410317101

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Connection rod bolts M12 and nuts, SET OF 12.



Fits:
Porsche 911S (1969)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 20.

Related reference numbers
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90110317200

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Connection Rod Bush.
6 per engine. Price is for each.

Fits:
Porsche 911/912 1965-69
Porsche 911 1970-83
Porsche 911 (930) Turbo 1975-77
Porsche 914-6 1970-76
Porsche 959 1987-88

Diagram Ref No 19.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110313102

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Connection Rod Bush.
6 needed per engine.
Price is for each

Fits:
Porsche 911/912 1965-69
Porsche 911 1970-83
Porsche 911 (930) Turbo 1975-77
Porsche 914-6 1970-76
Porsche 959 1987-88

Diagram Ref No 19

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90110313102

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Connection rod nut.
This connecting rod nut is used on the big-end of the connecting rod, clamping the rod cap securely to the rod during engine operation.
12 per engine. Price is for each

Fits:
Porsche 911 1965 - 1983
Porsche 911 (930) Turbo 1975 - 1977
Porsche 914 1970 - 1976

Diagram ref no 21.

Installed on the connecting rod bolts at the big end, this nut provides the required clamp load to keep the rod assembly rigid under combustion forces and inertia at speed. Built to OEM-style dimensions (commonly listed as M10), it supports accurate torqueing and secure retention under high RPM loads and repeated heat cycles - ideal for rebuilds, top-end refreshes, or bottom-end assembly work.

Con-rod fasteners live in one of the harshest areas of the engine. Nuts can be damaged, corroded, or compromised by previous over-torqueing or repeated reuse. Replacing with OE Match hardware helps ensure accurate torque application and dependable clamp load retention - critical for bearing life and engine reliability.

When to replace:
•  During any engine rebuild involving connecting rod removal
•  Nuts show thread damage, rounding, corrosion, or heat marking
•  Evidence of incorrect prior assembly/torque history
•  Preventive replacement on high-mileage or unknown-history engines

Related reference numbers
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90110317302

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Connection rod nut.
12 per engine. Price is for each.



Fits:
Porsche 911 1984-89
Porsche 911 (930) Turbo 1978-89
Porsche 964 1989-94
Porsche 993 1994-98
Porsche 996 Turbo / GT2 1998-05
Porsche 997 Turbo / GT2 2005-08

Click 'Zoom in' for large parts diagram.
Diagram Ref No 11.

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99310317403

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Con Rod Nut 
Sold each - 12 required per car

The OE Match Con Rod Nut is a critical internal engine fastener used to secure the connecting rod cap to the connecting rod assembly. Suitable for various Porsche 911, 964, 993, 996 Turbo and 997 Turbo engines, this precision-engineered component plays a vital role in maintaining the structural integrity of the engine's rotating assembly.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)
• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97
• Porsche 993 (911) TURBO S 1994-97
• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT2 2007-09

Diagram Ref No 11

The connecting rod assembly is subjected to enormous forces during engine operation, particularly at high RPM. The con rod nuts must maintain precise clamping force to ensure the connecting rod cap remains securely attached under extreme combustion and inertial loads. Even the slightest loss of clamping force can result in catastrophic engine failure.

For this reason, con rod nuts are considered a critical engine rebuild component and should always be replaced during engine overhauls, connecting rod servicing or performance engine builds.

What Does a Con Rod Nut Do?

The con rod nut secures the connecting rod cap to the connecting rod body, clamping around the crankshaft journal bearing.

Its functions include:

• Maintaining connecting rod cap security
• Preserving bearing crush and alignment
• Supporting crankshaft rotation
• Withstanding high engine loads
• Maintaining precise clamping force
• Supporting engine reliability
• Protecting internal engine components

The connecting rod assembly relies entirely on the integrity of its fastening hardware to survive the extreme loads generated during operation.

Why Do Con Rod Nuts Fail?

Con rod nuts are subjected to repeated tensile loads, heat cycles and vibration throughout their service life.

Common causes of failure include:

• Metal fatigue
• Repeated engine stress cycles
• Overstretching during previous installation
• Improper torque procedures
• High mileage wear
• Performance engine operation
• Corrosion during storage
• Reuse during multiple rebuilds

Many con rod nuts are designed as single-use fasteners and can lose their ability to maintain proper clamping force if reused.

When Should Con Rod Nuts Be Replaced?

Replacement is strongly recommended whenever the connecting rods are disassembled.

Typical situations include:

• Engine rebuilds
• Crankshaft replacement
• Connecting rod servicing
• Bearing replacement
• Performance engine upgrades
• Motorsport engine preparation
• Full engine restoration projects
• Preventative rebuild maintenance

As con rod nuts are relatively inexpensive compared to the cost of engine repairs, replacing them during rebuild work is considered essential best practice.

Why Replacement Matters

The con rod nut is one of the most critical fasteners within the entire engine.

Benefits of replacement include:

• Maintains correct clamping force
• Supports bearing integrity
• Reduces risk of engine failure
• Improves engine reliability
• Protects expensive internal components
• Essential for professional engine builds
• Supports high-performance applications
• Provides peace of mind during rebuilds

For air-cooled and turbocharged Porsche engines, correct connecting rod hardware is fundamental to long-term durability and performance.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99310317403

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Connection Rod Nut.
8 per engine. Price is for each.

Connecting rods nuts must be replaced every time they are removed. Do not reuse old rod nuts.

Fits:
Porsche 912 1965-69
Porsche 356 A / B / C 1950-65

Click picture for large parts diagram.
Diagram Ref No 23.

Related reference numbers
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50203114

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