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Fillister Head Spring Bolts

Fillister head spring bolts, also known as center 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: 1/4" – 1 1/8"
Lengths: 3/8" – 11 3/4"

Diameters: M6 – M24

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


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


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

fillister head spring bolts
fillister head spring bolts
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