Extra-Long High-Straightness Bolts for Electric Motors

Long bolts for motor through-bolts, where straightness matters more than strength.

Key specifications

MaterialCarbon Steel / Stainless Steel (customizable)
Installationinserted through long bores in sequence
StandardGB/T 3098.1, customer drawing (straightness)
Typical substratemotor tie rods, long-stroke clamps
Key inspectionsstraightness, coaxiality, tensile strength

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Product overviewOverview

Above a length-to-diameter ratio of about 10, stiffness falls sharply and a small straightness error turns into a side force during assembly. The bolt either will not pass through a long bore or, once tightened, introduces a bending moment. For these parts straightness, thread-to-shank coaxiality and surface finish matter more than tensile class.

Material: Carbon Steel / Stainless Steel (customizable). It is inserted through the bores in sequence before tightening.

Key featuresFeatures

Straightness controlled over the full length, critical at high slenderness.
Thread and shank coaxial, so the bolt enters long bores without binding.
Ground finish reduces friction during insertion.
Heat treatment before finishing to avoid distortion.

Typical applicationsApplications

Motor through-bolts
Long-stroke fixture clamping
Hydraulic cylinder tie rods

Selection notesSelection

Above a slenderness ratio of 15, agree the straightness measurement method (runout or surface plate) before ordering.

Frequently asked questionsFAQ

How do I specify the Extra-Long High-Straightness Bolts for Electric Motors?

Above a slenderness ratio of 15, agree the straightness measurement method (runout or surface plate) before ordering. Material: Carbon Steel / Stainless Steel (customizable). It is inserted through the bores in sequence before tightening.

What matters during installation of the Extra-Long High-Straightness Bolts for Electric Motors?

Insert it through the bores in sequence before tightening. Straightness controlled over the full length, critical at high slenderness.

Specifications

Material	Carbon Steel / Stainless Steel (customizable)
Standard	GB/T 3098.1, customer drawing (straightness)
Installation	inserted through long bores in sequence
Typical substrate	motor tie rods, long-stroke clamps
Key inspections	straightness, coaxiality, tensile strength

Manufacturing and inspection

Straightness measured on a runout fixture or surface plate with a dial indicator, per length or overall.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.