Round Head Square Neck Screws | McMaster-Carr

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Material

Stainless Steel

Finish

Hot-Dipped Galvanized

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Threading

Partially Threaded

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Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Hardness

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Thread Fit

Metric Class 6g

Metric Class 6h

Metric Class 8g

Unified Standard Class 2A

Unified Standard Class 3A

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U.S.–Mexico–Canada Agreement (USMCA) Qualifying

DFARS Specialty Metals

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838 Products

Carriage Bolts

Medium-Strength Grade 5 Steel Square-Neck Carriage Bolts

Medium-Strength Grade 5 Steel Square-Neck Carriage Bolts

Suitable for fastening most machinery and equipment

18-8 Stainless Steel Square-Neck Carriage Bolts

18-8 Stainless Steel Square-Neck Carriage Bolts

Good chemical resistance to water and mild chemicals such as cleaning solutions

Medium-Strength Metric Class 8.8 Steel Square-Neck Carriage Bolts

Medium-Strength Metric Class 8.8 Steel Square-Neck Carriage Bolts

Suitable for fastening most machinery and equipment

Low-Strength Steel Square-Neck Carriage Bolts

Low-Strength Steel Square-Neck Carriage Bolts

About half the strength of medium-strength bolts for light duty fastening

Highly Corrosion-Resistant 316 Stainless Steel Square-Neck Carriage Bolts

Highly Corrosion-Resistant 316 Stainless Steel Square-Neck Carriage Bolts

Excellent resistance to salt water and harsh chemicals such as bleach

High-Strength Grade 8 Steel Square-Neck Carriage Bolts

High-Strength Grade 8 Steel Square-Neck Carriage Bolts

Often used in high-stress applications, such as valves, pumps, and motors

Bronze Square-Neck Carriage Bolts

Bronze Square-Neck Carriage Bolts

Electrically conductive and corrosion resistant to salt water, gases, and sewage

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)