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CRV steel at 58-62HRC is what we settled on, and it's good balance—hard enough for impact driving but not so brittle you'll get edge chipping on slotted heads in soft brass. We've got them running at roughly 75mm to 150mm bit lengths, shank size is the standard 1/4" hex, so they'll chuck into any impact driver or torque wrench without adapters. Magnetic tip retention isn't great for heavy structural bolts over, say, 8mm diameter, but for general assembly and furniture work it'll hold a #2 Phillips in place just fine.
Laser engraving the logo is actually a durability move more than a branding one. We usually do it on the handle ferrule or the shank near the stop collar, and the etch depth gives about 0.1mm of permanent mark that survives acetone, IPA wipes, and the thermal cycling of autoclave sterilization (not that you'd autoclave a screwdriver normally, but some cleanroom folks do). The chemical resistnce on the engraving is better than pad printing or hot stamping—solvents won't lift it unless you're literally soaking in MEK for hours.
Surface treatment matters here because of galvanic corrosion potential with stainlss steel fasteners. So we've got chrome plating, nickel coating, bronze finish, black oxide, and sandblasted surfaces. Chrome looks clean but can flake if the pre-treatment isn't done right—we're using a 3-micron nickel undercoat before the chrome layer, which is tighter tolerance than most stamped bits at this price point. Sandblasting gives a matte texture that reduces glare under inspection lights, and some buyers go with it specifically for that. Black oxide is fine for dry environments but in humid labs you'll want at least nickel or bronze to avoid surfce rust forming after 2-3 wipe-downs.
Also, teh TPR handle—what it does is provide a 50 Shore A durometer grip, which is softer than the polypropylene handles on the cheap Amazon kits but not as tacky as TPE. We've got stock right now for bulk packaing in polybags, blister pads, or a plastic case that holds eight bits in the insert. Blister pack is the most common for retail, but for your team's bench drawers we pretty much always recommend just bulk in poly bag tubes—takes up less space and you're not paying for the plastic card waste.
The hardness is 58-62HRC across the whole bit length, not just the tip, which is actually better than some with dual-tempered tips that get brittle near the shank neck. One concrete thing that happened: a trial run of 75mm bits in 302 stainless steel cross-recess screws showed tip deformation at 58HRC on the low end, so we recommend the 60-62 end range for any high-torque repetitive work. COA comes with each lot.
We typically start at 500 pieces for custom orders with laser engraving, but we can work with smaller quantities depending on your needs. Just reach out and we'll see what we can do.
Yes, we can provide a mill test report or hardness test certificate for each batch. Just let us know what format you need when placing your order.
Absolutely, we can combine Philips and slotted heads in various lengths—75mm, 100mm, or 150mm—all in the same bulk or blister pack. Just specify the mix.
Usually around 15 to 20 working days after sample approval, depending on the order size. If you need it faster, we can sometimes rush it.
Yes, they're magnetized to hold screws firmly, even at 58-62HRC hardness. We test them to ensure they stay put during impact driving.
