16 Piece Tough As Nails M4 X 140mm Hex Socket Head Cap Screws 12.9 Grade Carbon Steel Allen Drive Partially Threaded Black Oxide Heavy Duty Hardware Fastener Set Top Shelf Garage Bolts

High Strength M4 Socket Head Cap Bolt Pack
✔️ M4 x 140mm partially threaded carbon steel grade 12.9 screw set

This hardware batch delivers fully quenched hex drive fasteners built for heavy clamping duty across workshop builds and machine chassis repairs.

✅ 12.9 grade carbon steel body provides high tensile strength around 1220 N/mm²
✅ 3 millimeter wrench aligns with the seven millimeter flat countersunk head shape
✅ Half thread covers twenty five millimeters leaving a smooth grip shoulder underneath
✅ Total span measures 5.51 inches / 140 mm for deep mounting reach

💡 Why mechanics and fabricators often choose fully hardened hex drive bolts over standard studs?
Picking the right fastener can be handy when you need reliable clamping in cramped setups.
- Medium carbon steel core handles heavy shear forces without stretching out
- Half threaded shank lets you adjust gap spacing quickly before locking things down
- Blued zinc alternative finish stops corrosion while staying affordable for bulk swaps
- Deep hex pocket takes impact drivers steady to keep your knuckles safe

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