Description
Monster Overview:
Fix your project right the first time with M3.5-1.57 Flat-Head 6-Lobe PT Alternative Thread-Forming Screws from Monster Bolts. Their 30° trilobular profile cold-flows thermoplastic bosses, creating chip-free, vibration-resistant threads. A bright CR+3 zinc finish followed by a hydrogen-relief bake delivers RoHS-compliant corrosion protection, while through-hardened carbon steel provides production-grade strength for enclosures, automotive interiors, and other heavy-duty plastic assemblies.
Monster Features
- Flat Countersunk Head 90°: Sits flush for a snag-free, professional finish.
- 6-Lobe Drive: Star / Torx® / hexalobular recess (T20) supplies high torque with minimal cam-out.
- 30° PT Trilobular Thread: 1.57 mm pitch forms strong internal threads at lower drive torque.
- Through-Hardened Steel: ≥M3.5 sizes are fully hardened for maximum shear strength.
- Zinc & Bake Finish: Clear CR+3 zinc plating plus post-plate bake—fully RoHS compliant.
- Full Thread: Fully threaded shank grips plastics of any thickness.
Monster Specifications
| Feature | Details |
|---|---|
| Diameter / Pitch | M3.5 × 1.57 mm (PT trilobular, 30°) |
| Available Lengths | 6 mm – 30 mm (fully threaded) |
| Head / Drive | Flat Countersunk 90° / T20 6-Lobe |
| Thread Form | PT Alternative, 30° trilobular thread-forming |
| Material | Through-Hardened Carbon Steel |
| Finish | CR+3 Zinc, baked (RoHS) |
| System of Measurement | Metric |
| Trademark Notice | EJOT® and PT® are registered trademarks of EJOT® GmbH & Co. KG. These screws are not manufactured or authorized by EJOT. |
More Monster Bolts
Need stainless versions or different head styles? Explore our complete Metric PT-Style Screw collection .
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