Left-Hand Threaded Hex Head Cap Screws

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Unified Standard Class 2A

Unified Standard Class 3A

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60,000 psi to 99,999 psi

100,000 psi or greater

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DFARS Specialty Metals

279 Products

Screws and Bolts

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

These metric screws help prevent counterclockwise-moving parts from loosening. Use them for medium-strength fastening.

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in medium-strength fastening applications.

Left-Hand Threaded High-Strength
Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in high-strength fastening applications.

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Left-Hand Threaded Alloy
Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening.

Left-Hand Threaded 18-8 Stainless
Steel Socket Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, these screws have good chemical resistance.

Metric Left-Hand Threaded Flat Head Screws

Tighten these metric screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Left-Hand Threaded Flat Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion.

Left-Hand Threaded Button Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic.

Metric Left-Hand Threaded Button Head Screws

Turn these metric screws to the left to tighten; once fastened, they prevent loosening from counterclockwise motion. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Left-Hand Threaded Shoulder Screws

Tighten these shoulder screws by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Screws and Bolts

Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-StrengthGrade 5 Steel Hex Head Screws

Left-Hand Threaded High-StrengthSteel Hex Head Screws

Left-Hand Threaded 18-8Stainless Steel Hex Head Screws

Left-Hand Threaded AlloySteel Socket Head Screws

Left-Hand Threaded 18-8 StainlessSteel Socket Head Screws

Metric Left-Hand Threaded Flat Head Screws

Left-Hand Threaded Flat Head Screws

Left-Hand Threaded Button Head Screws

Metric Left-Hand Threaded Button Head Screws

Left-Hand Threaded Shoulder Screws

Left-Hand Threaded Medium-Strength
Metric Class 8.8 Steel Hex Head Screws

Left-Hand Threaded Medium-Strength
Grade 5 Steel Hex Head Screws

Left-Hand Threaded High-Strength
Steel Hex Head Screws

Left-Hand Threaded 18-8
Stainless Steel Hex Head Screws

Left-Hand Threaded Alloy
Steel Socket Head Screws

Left-Hand Threaded 18-8 Stainless
Steel Socket Head Screws