Hex Cap Screws / Tap Bolts (Inch) are the workhorse fasteners of construction, machinery, and heavy equipment. With a hexagonal head for wrench tightening, they deliver high clamping force and dependable strength.
Monster Bolts stocks a full range including Grade 8 alloy steel (black oxide or zinc yellow), 18-8 stainless steel for corrosion resistance, and premium L9 zinc yellow (Made in USA) for critical high-strength applications.
Why Choose Monster Bolts Hex Cap Screws?
- Heavy-Duty Strength: Grade 8 alloy steel and L9 USA-made fasteners for maximum tensile strength.
- Material Options: 18-8 stainless steel for excellent corrosion resistance.
- Coating Choices: Black oxide for a clean finish or zinc yellow for added visibility and mild corrosion protection.
- Tap Bolt Ready: Full-thread and partial-thread options available depending on size and spec.
Where They Work Best
- Construction and infrastructure projects needing high-strength fasteners.
- Machinery, engines, and equipment where durability is critical.
- Outdoor or corrosive environments with 18-8 stainless steel.
- High-performance applications using L9 USA-made zinc yellow bolts.
Looking for metric sizes? Visit our Metric Hex Cap Screws collection.
Questions on grade, finish, or length? Call (850) 764-2658 or email support@MonsterBolts.com — our team will match the right bolt to your project.
1/4"-20 Hex Cap Bolts screws Grade 8 Alloy Steel with Black Oxide
Sale priceFrom $1.70
1/4"-20 Grade 8 Indented Hex Flange Screws (Frame Bolts) – Black Phosphate & Oil
Sale priceFrom $2.53
1/4"-20 Stainless Steel Hex Cap Bolts / screws, 18-8 (A2)
Sale priceFrom $1.99
1/4"-20 Hex Cap Bolts / screws Grade 8 Alloy Steel, Zinc-Yellow
Sale priceFrom $1.68
5/16"-18 Hex Cap Bolts / screws Grade 8 Alloy Steel w/ Black Oxide
Sale priceFrom $2.63
5/16-18 Grade 8 Indented Hex Flange Screws (Frame Bolts) – Black Phosphate & Oil
Sale priceFrom $4.28
5/16"-18 Stainless Steel Hex Cap Bolts / screws 18-8 (A2)
Sale priceFrom $3.08
5/16"-18 Hex Cap Bolts / screws Grade 8 Alloy Steel, Zinc-Yellow
Sale priceFrom $2.13
3/8"-16 Hex Cap Bolts / screws Grade 8 Alloy Steel, Zinc-Yellow
Sale priceFrom $2.74
1/4"-20 L9 Hex Head Cap Screw – Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $29.70
1/2"-20 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $108.56
3/4"-10 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $135.44
3/4"-16 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $146.32
7/8"-9 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $162.49
7/8"-14 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $206.41
1"-8 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $157.45
1-1/8"-7 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $379.13
1-1/8"-12 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $426.26
1-1/4"-7 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $362.35
1-1/4"-12 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $423.92
1-1/2"-6 L9 Hex Head Cap Screw – Coarse Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $767.94
1-1/2"-12 L9 Hex Head Cap Screw – Fine Thread Alloy Steel Zinc Yellow CR+3 (Made in U.S.A.)
Sale priceFrom $585.81