Specifications
Metal-core construction, visible obsidian head, controlled-use installation.
Great Lakes Specialty Fasteners does not supply fully obsidian load-bearing screws. Our products are metal-core Torx fasteners with a visible obsidian head element for approved non-structural, low-torque applications where finish and repeatability matter.
Construction & Load Path
| Threaded shank | Stainless or titanium metal core carries the thread, tensile load, and installation load. |
|---|---|
| Torx recess | Drive interface is formed in metal. Installation torque is transmitted through metal only. |
| Visible head | Machined obsidian head face or head shell provides the exposed visual surface after installation. |
| Retention method | Obsidian element is seated into a metal head geometry and retained by mechanical support plus industrial bonding. |
| Product role | Visible premium hardware for non-structural assemblies, service covers, trim, and design-led closures. |
Commercial Quote Range
| Drive size | T6 through T30 |
|---|---|
| Metric range | M2, M2.5, M3, M4, M5, M6 |
| Imperial range | #2-56 through 1/4-20 for selected account programs |
| Length range | 4 mm to 40 mm typical, longer parts subject to drawing review |
| Head styles | Low dome, pan, shallow countersunk, trim head, and customer-specific visible-head formats |
Material Stack
| Core metals | 18-8 stainless, 316 stainless, and selected titanium options for approved programs |
|---|---|
| Visible material | Graded obsidian selected for color consistency, finish response, and edge stability |
| Metal finish | Dark-finished metal center and head components to reduce visual contrast around the Torx recess |
| Finish classes | Polished black, satin black, matte low-glare, and edge-softened exhibit finish |
| Packaging | Tray packs, foam-safe kits, count-controlled cartons, and custom labels |
Configuration Options
- Head geometry: low dome, trim head, shallow countersunk, and custom visible-head forms can be reviewed.
- Thread format: metric and selected imperial thread systems can be supported for repeat account programs.
- Finish control: batch appearance can be controlled to stored finish masters for visible account programs.
- Packaging & ID: count, tray pattern, label text, and lot coding can be tailored to the buyer’s release process.
Installation Envelope
- Controlled torque only: the approved driver size and installation procedure must be defined before release.
- Known substrate only: approved programs require a defined host material and assembly context.
- Pilot signoff required: recurring production begins only after the pilot lot has been accepted for the intended assembly.
- Serviceability by review: removal and reinstall cycles are reviewed case by case, not assumed.
Application Exclusions
- No structural use: we do not approve structural, preload-critical, or safety-critical fastening duties.
- No impact installation: uncontrolled field driving and impact-driver use are outside the approved envelope.
- No abuse environments: repeated field abuse, blind high-speed installation, and high-cycle service are declined.
- No implied equivalence to steel hardware: the product is a specialty visible fastener system, not a commodity industrial screw.
What To Send With An RFQ
- Part definition: drawing, thread format, drive size, head style, and target finish.
- Assembly details: host material, visibility, service environment, and installation procedure.
- Commercial details: prototype quantity, annual volume, pack format, and requested ship date.
- Special requirements: export documents, custom labels, batch-retention needs, and account-specific packaging.
Need a drawing reviewed before you open a pilot lot?
Our applications team will tell you quickly whether the part fits our approved use envelope and what information is still missing from the quote package.