{"product_id":"the-light-source-inc-pcb38","title":"The Light Source Purlin Clamp Aluminum Truss Beam Clamp | 3\/8\" | Black","description":"\u003cp\u003eThe Light Source Inc. Purlin Clamp is engineered for AV integrators, riggers, and production crews who need a reliable, code-conscious attachment point on structural steel. It slides onto bar joists, purlins, and I-beams up to 1 inch thick, providing a fixed anchor for fixtures, speakers, drape motors, and other production loads in permanent install and touring temporary-hang scenarios.\u003c\/p\u003e\u003cp\u003eThe extruded aircraft-grade aluminum body resists corrosion and keeps weight low without sacrificing structural integrity. Micro-grooves machined into the clamping surface bite into the beam flange to prevent rotation and lateral creep under dynamic loading — a meaningful advantage over smooth-face alternatives when vibration from subwoofers or motor pull cycles is a factor.\u003c\/p\u003e\u003cp\u003eIn late 2024, The Light Source Inc. revised the PC line load ratings to increase safety margins beyond OSHA minimums, adding the -HD variant for heavier applications. The standard PCB3\/8 carries a 210 lb. working load limit with 3\/8\"-16 TPI hardware, making it the right choice for lighting fixtures, small speaker enclosures, and ancillary rigging points where a 1\/2\" clamp would be oversized. Supplied hardware covers immediate deployment: a square head set screw locks the clamp to the member and a grade 5 hex head bolt provides the load connection point.\u003c\/p\u003e","brand":"TMB","offers":[{"title":"Default Title","offer_id":52451890626744,"sku":"200172","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/7382\/4696\/files\/200172_LIGHTSOURC-PCB3_8_ALT01sqr.jpg?v=1784125342","url":"https:\/\/soundpro.com\/products\/the-light-source-inc-pcb38","provider":"SoundPro","version":"1.0","type":"link"}