Audited Supplier
| Head | Hex Flat head |
| Size | 1.5-2-2.5-3-4-5-6-8-10mm |
| Material | S2, CRV |
| Treatment | Integral Heat Treatment |
| Hardness | HRC 55-60 |
| Surface Treatment | Fine Grinding, Mirror Spray Plastic Treatment |
| Standard | DIN, GB, ANSI, BSW, JIS, GOST |
| Packaging | Carton Boxes + Pallets |
| Carton Sizes | 430*430*330mm |
| Brand | Union |
| Certification | ISO9001:2015, BSCI |
| Origin | China |
Hex keys, also known as Allen keys or Allen wrenches, are a vital tool for mechanics, engineers, and machinists working with hex fasteners. These L-shaped bars allow torquing bolts, screws, and other fasteners in hard-to-reach spots and tight quarters where bulky wrenches are unusable. With a versatile and compact design, hex keys provide efficient access and usability across limitless applications.
What is a Hex Key?
Hex keys consist of a short L-shaped metal bar with a hexagonal shaft on the long arm that engages with hexagonal socket screws and bolts. The short arm provides improved leverage and access for generating torsion and driving the fastener. The most common size range is from .028" across flats up to 3/8", covering imperial and metric fasteners. Long-arm versions give even greater reach.
| Main Fastener Coating | |||
| Types | Application | Spray Test Hours | Characteristics |
| Mirror Nickel-plating | ALL Metal | 72Hours | Stable Excellent polishing performance Improve Wear resistance Wide range of applications |
| Matt Nickel-plating | ALL Metal | 72Hours | |
| Black Nickel-plating | ALL Metal | 48Hours | High absorption rate of solar energy Used in solar collector panels. |
| Manganese Phosphate | ALL Metal | 72Hours | Enhanced resistance |
| Sand Blast | ALL Metal | - | Remove paint, rust, and residue scratches or casting marks |
| Electrophoresis | ALL Metal | 1000Hours | Maintain metallic luster Anti-corrosion properties |
| Color Electroplating | ALL Metal | 96Hours | Improve mental strength Prevent metal oxidation |
| Steel Material Chemical Composition | ||||||||
| Types | C | Si | V | Cr | Mn | Ni | Mo | Characteristic |
| CR-MO | 0.18-0.23 | 0.15-0.35 | - | 0.40-0.60 | 0.90-1.20 | - | 0.13-0.20 | 41xx-series SAE steel grades Excellent strength-to-weight ratio Stronger and harder Not easily welded |
| CRV | 0.5 | 0.3 | 0.18 | 0.80-1.10 | 0.70-0.90 | - | - | 6000-series SAE steel grades Suitable for hardening Resist abrasion, oxidation, and corrosion Improve material elasticity |
| S2 | 0.40-0.55 | 0.90-1.20 | <0.50 | - | 0.30-0.50 | <0.30 | 0.30-0.60 | One of seven types of shock-resisting steels under the AISI Classification High strength High toughness Wear resistance High hardness Resistance to shock loading |
| 45# | 0.42-0.05 | 0.17-0.37 | - | ≤0.25 | 0.50-0.80 | ≤0.25 | - | Compared with A3, it has higher strength and resistance to deformation. |
| A3 | 0.95-1.05 | 0.10-0.50 | 0.15-0.50 | 4.75-5.50 | 0.40-1.00 | - | 0.90-1.40 | High-quality high carbon alloy tool steel |
