Grade 14.9 Ultra-High Strength Connecting Rod Bolt

Class 14.9 connecting-rod bolts, a beyond-standard grade controlled by agreement.

Key specifications

MaterialCustomized per specification
Installationset from measured torque/clamp-force data
StandardGB/T 3098.1 (reference), GB/T 3098.17 (hydrogen embrittlement)
Typical substratehigh-output connecting rods
Key inspectionstensile strength, hydrogen embrittlement, decarburisation

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Product overviewOverview

It is worth stating plainly that class 14.9 is not part of GB/T 3098.1 or ISO 898-1, whose highest standard class is 12.9 (about 1220 MPa). 14.9 is a purchaser-supplier agreement grade with a nominal tensile strength around 1400 MPa, and it demands cleaner steel, tighter heat treatment and more careful surface finishing than any standard class.

Material: Customized per specification. It is set to the torque the measured clamp-force curve supports.

Key featuresFeatures

Agreement grade beyond the GB/T 3098.1 range, so acceptance criteria must be written down.
Nominal tensile strength around 1400 MPa with tight inclusion control.
Vacuum heat treatment avoids hydrogen pickup.
Hydrogen-free finishes preferred; plated parts baked and preload-tested.

Typical applicationsApplications

High-output engine connecting rods
Motorsport and performance powertrains
Compressors and high-pressure pumps

Selection notesSelection

Do not assume a 14.9 grade exists as a catalogue item; confirm the design basis before specifying it.

Frequently asked questionsFAQ

How do I specify the Grade 14.9 Ultra-High Strength Connecting Rod Bolt?

Do not assume a 14.9 grade exists as a catalogue item; confirm the design basis before specifying it. Material: Customized per specification. It is set to the torque the measured clamp-force curve supports.

What matters during installation of the Grade 14.9 Ultra-High Strength Connecting Rod Bolt?

Set it to the torque that the measured clamp-force curve supports. Agreement grade beyond the GB/T 3098.1 range, so acceptance criteria must be written down.

Specifications

Material	Customized per specification
Surface Treatment	As required
Standard	GB/T 3098.1 (reference), GB/T 3098.17 (hydrogen embrittlement)
Installation	set from measured torque/clamp-force data
Typical substrate	high-output connecting rods
Key inspections	tensile strength, hydrogen embrittlement, decarburisation

Manufacturing and inspection

Tensile, yield, elongation and impact energy against the agreed specification.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.