The Swivel Anchor That Follows the Worker
The STB5K ALPHA is a reusable bolt-on anchor for steel substrates with a D-ring that swivels a full 360° and pivots front to back through 180° — the connection point tracks the worker instead of side-loading as the task moves. It supports permanent and temporary installations, works as a single-user anchor point or in combination with other approved anchors, and the mounting bolt is included, so it is ready to use straight out of the bag.
Rated at 5,000 lbs tensile strength with a 310 lb maximum user capacity, the ALPHA is finished in galvanized zinc with yellow passivation for corrosion protection indoors and out, and is built tough for job-over-job durability. It meets ANSI Z359.18 and Z359.7 and is suitable for OSHA 1910 and 1926 work in vertical, horizontal, or overhead orientations.
Who Needs This Product
This product is an anchorage connector — the fixed tie-off point of a personal fall protection system. The structural steel it bolts to is the anchorage; the worker wears a full body harness; a lanyard or self-retracting lifeline connects the two. The ALPHA supplies the rated connection point with a swivel that keeps the connector aligned as the worker moves around it.
Features
360° swiveling D-ring
The D-ring rotates a full circle and pivots 180° front to back, keeping the connecting device aligned with the worker for best mobility.
Permanent or temporary
Supported for both permanent installations and temporary, take-it-with-you anchor points on steel structures.
Bolt included
Ships with the mounting bolt in the bag — ready to install without a hardware run.
Corrosion protected
Galvanized zinc with yellow passivation works in outdoor and indoor environments alike.
Built for job after job
Compact but built tough to withstand jobsite abuse and stay in service job over job.
Any orientation
Use it in vertical, horizontal, or overhead applications on qualifying steel.
Technical Specifications
| SKU | STB5K |
|---|---|
| Type | ALPHA swivel bolt-on steel anchorage connector |
| Tensile strength | 5,000 lbs |
| Maximum user capacity | 310 lbs (single user) |
| Weight | 1.2 lbs |
| Material | Steel |
| Finish | Galvanized zinc with yellow passivation |
| D-ring articulation | 360° swivel; 180° front-to-back pivot |
| Key dimensions | 4.8 in (123 mm) tall; 3 in (76 mm) base; 2 in (53 mm) ring |
| Installation | Bolt-on; mounting bolt included |
| Standards | ANSI Z359.18, ANSI Z359.7; OSHA 1910, OSHA 1926 |
Qualify the steel first. The ALPHA anchor is only as strong as the steel it bolts to. A competent person must verify the structural steel substrate and the bolted connection per the user manual before anyone ties off. One worker per anchor point, 310 lbs maximum including tools.
Compliance Standards
ANSI Z359.18
Meets the American National Standard for anchorage connectors used in personal fall protection systems.
ANSI Z359.7
Third-party product testing and certification requirements of the Z359 fall protection code.
OSHA 1910
Suitable for general industry fall protection applications when installed per the manual.
OSHA 1926
Suitable as an anchorage connector under OSHA construction fall protection rules.
Typical Applications
Installation Overview
Follow the manufacturer's manual. The sequence below is an overview only.
- Verify the steel. A competent person confirms the structural steel substrate can support the loads required by the manual.
- Prepare the mount. Drill the mounting hole in the steel member at the planned location per the user manual.
- Bolt the anchor. Install the ALPHA with the included bolt and torque to the manual specification.
- Check articulation. Confirm the D-ring swivels and pivots freely with no binding or play in the base.
- Connect. Attach the lanyard or SRL connector to the D-ring; one worker per anchor.
- Relocate or leave in place. Unbolt and move it as a temporary point, or leave it installed permanently.
Inspection and Retirement
Inspect before each use, with a documented competent-person inspection at least every 6 months. Pull the equipment from service for any of the conditions below.
- Base and body: deformation, cracks, or corrosion in the steel.
- D-ring: smooth 360° swivel and 180° pivot with no binding, spreading, or excessive play.
- Bolt and connection: full engagement, correct torque, no thread damage.
- Finish: galvanizing worn through with active rust on load-bearing surfaces.
- Markings: product label and rating legible.
Retirement triggers: any fall arrest loading, a D-ring that binds or has spread, deformation or corrosion of the base, bolt or thread damage, or any condition where the inspector cannot verify the anchor is fit for service.
Fall ProtectionDistributors, LLC Free Tool · No Signup · OSHA 1926.502 Free Interactive Tool Fall Protection Calculator Pick your system. Run the math. Generate a plan. 1Pick Your SystemDetermine fall restraint vs. fall arrest based on your work surface, edge access, and clearance. 2Run the MathCalculate exact fall clearance required below the work surface for your SRL or lanyard setup. 3Generate a PlanGet a printable OSHA-compliant Fall Protection Plan structured around 29 CFR 1926.502(k).
Frequently Asked Questions
Frontline STB5K Submittals and Documentation
Frontline STB5K Spec Sheet (PDF)Dimensions, materials, strength ratings, and the full compliance summary. Frontline STB5K Test Report (PDF)Third-party laboratory test results documenting the strength rating. Frontline STB5K User Manual (PDF)Installation, use, inspection, and retirement procedures.Compatible and Related Products
- Frontline STWD5K ALPHA Swivel Weld-on Anchor. The same ALPHA swivel head with a weld-on mounting puck.
- Frontline STB01 Steel Bolt Threaded Anchor 3-Pack. Three forged threaded steel anchors in one economical pack.
- Frontline STM585K MEGA Swivel 5K Steel Anchor. The MEGA Swivel family alternative with a key-lock swivel housing.
- Frontline RO Commercial Roof Anchor. The ANSI Z359.18 roof anchor for concrete, metal, and wood decks.
Putting Swivel Anchors on Steel?
Need help specifying the right system for your jobsite? Confirm your application, anchorage, and clearance with us and we will walk through the kit list so the right equipment ships together.
Call 863-703-4522 to talk to a fall protection specialist.
