50 Piece 1/4-20 By 3/8 Inch Alloy Steel 10.9 Grade Hex Socket Button Head Cap Screws Bolts Kit With Black Oxide Finish For DIY Projects Automotive Machinery Heavy Duty Fasteners
✔️ 50 pcs, 1/4-20 x 3/8 in, alloy steel 10.9, black oxide
This kit includes 50 hex socket button head screws and a single hex key, all neatly stored in a durable plastic storage box. It’s ideal for DIY projects, automotive repairs, and heavy-duty machinery assembly that require a clean, secure finish.
✅ Thread size: 0.250 in (6.36 mm), length 0.375 in (9.53 mm), head dia 0.428 in (10.87 mm)
✅ Drive: hex socket (internal hex), hex size 5/32 in
✅ Material: alloy steel 10B21, black oxide finish for anti-rust
✅ Strength: 10.9 grade, hardness 32-39 HRC, tensile 1040 N/mm²
✅ Includes 1 hex key, chrome-vanadium steel, nickel plated
✅ Pack: 50 screws + 1 hex key in plastic storage box
💡 What is a common use for 1/4-20 hex socket button head screws in DIY and automotive projects?
Handy for clean, low-profile fastening where head height matters.
- 1/4-20 thread is common in hobby, automotive, and machinery fasteners
- Button head provides a low-profile finish to avoid snagging
- Hex socket drive lets you install with a hex key securely
- Includes 50 screws and 1 hex key in a portable storage box