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Angled close-up of a silver socket adapter with knurled band and dark flat screwdriver bit, showing the socket's square recess and embossed logoClose view of a slotted screwdriver bit seated in a silver socket adapter, showing knurled grip, embossed marking, hex shank and flat blade tip

4mm Flat Bit Attachment, 1/4-Inch Drive, Chrome Vanadium & S2 Steel

Precision 4mm flat bit attachment with dual-steel construction for controlled manual screwdriving and assembly work.

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Description

Product Description

Brief Overview

This 4mm flat bit attachment combines chrome vanadium outer construction with hardened S2 steel bit material—a proven dual-steel formula that delivers durability and precision control for manual screwdriving applications. The 1/4-inch square drive connects seamlessly to standard ratchets, quick-release handles, or pneumatic adapters, making it equally effective in assembly workshops and field repair scenarios. If you work with multiple bit sizes, consider stocking the complete 3mm through 8mm flat bit range for maximum coverage across your customer base.

Key Features

  • Dual-Steel Construction: Chrome vanadium outer sleeve with hardened S2 steel bit—optimizes strength without brittleness
  • Compact Design: 37mm overall height with 18mm blade depth fits confined spaces and tight screw pockets
  • Precision Blade Profile: Flat-ground tip (11.9mm outer diameter) prevents cam-out and bit slip during insertion
  • 1/4-Inch Drive: Universal compatibility with ratchet handles, impact adapters, and quick-change systems
  • Knurled Grip Ring: Textured surface ensures control during manual hand-ratchet operation
  • Industrial-Grade Machining: Each bit is precision-turned and heat-treated for consistent performance

Business Advantages for Resellers

High-Margin Consumables & Accessories:

  • Flat bits wear and break in active shops—repeat purchase driver
  • Compact packaging allows high-volume floor/wall display
  • Pairs naturally with ratchet handle sets and bit socket kits
  • Excellent margin on bulk orders (3–8mm range)

Workshop Essential:

  • Assembly technicians, automotive shops, and manufacturing floors stock these in multiples
  • Low unit cost makes it an impulse add-on to larger tool orders
  • Positions your inventory as a complete manual-drive solution

OEM Integration:

  • Works with existing 1/4-inch drive infrastructure your customers already own
  • No training or education required—immediate utility
  • Reduces customer need to source bits from multiple vendors

Technical Specifications

Parameter Value
Bit Size 4 mm
Drive Connection 1/4-Inch Square Drive
Outer Diameter (D2) 11.9 mm
Blade Depth (T) 18 mm
Overall Height (L) 37 mm
Material Chrome Vanadium Steel (Outer) / S2 Steel (Bit)
Part Number 740204
Surface Finish Matte Chrome / Dark Tempered Steel

Recommended Stock Strategy

Stock the 4mm alongside the 3.5mm, 5mm, 5.5mm, and 6mm variants to build a complete flat-bit line. Shops that use one size typically need backups and complementary sizes for assembly variety. Bundle pricing on mixed-size packs will accelerate turnover and increase average transaction value.

Bottom Line: A straightforward, reliable flat bit attachment built for shops that value precision screwdriving without unnecessary complexity. Professional-grade materials, proven drive compatibility, and natural repeat-purchase demand make this a staple for any tool distributor serving assembly and repair markets.