Center Spring Bolts

Center spring bolts, also known as fillister head spring bolts, are manufactured and stocked by Auto Bolt. Special dimensions, such as head heights, head types, and thread lengths, can be produced. Configurations are available in either inch or metric sizes. Special tooling can be created to produce nonstandard headmarks.

Size Ranges:

Diameters: 5/16” – 5/8”
Lengths: 3/4” – 60”

Standard Materials:

Carbon Steels: SAE 1008, 1010, 1018, 1038, 1541, and 10B21.
Alloy Steels: SAE 1335, 4037, 4140, 5140, 8620, 8637, and 8740.
Stainless Steels: 302, 304.

Coatings:

Zinc, zinc yellow, phos & oil, black oxide, cadmium, and organics. Other coatings on request.

Manufacturing Specifications:

Auto Bolt manufactures certified quality products using industry standards such as ASTM, ASME, ANSI, SAE, ISO, and DIN.

Technical Drawings

Refer to the following blueprints to learn more about the dimensions and specifications of these products:

Spring Center Metric

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