5/8 Textured Tube (Extension Arm)
Solid steel extension gobo arm designed for 2-1/2" and 4-1/2" grip head knuckles. Features diamond-knurled anti-twist surface texturing and solid 5/8" Baby Pin termination to eliminate modifier rotational slippage under heavy flag and luminaire payloads.
SKU:
PTT-PSV20-058
5/8 Textured Tube (Extension Arm)
Engineering Fact Sheet & Mechanical Specifications
Reach & Payload Metrics Imperial / Metric
| Primary Mounting Mount | 1-1/8" Junior Pin & 5/8" Baby Pin Solid Stainless Steel |
| Working Load Limit (WLL) | 20.0 lbs (20" Arm) to 6.0 lbs (60" Arm) at full 90Β° horizontal cantilever |
| Torque & Bending Limit | Ο = r Γ F β€ 45 NΒ·m (33.2 ft-lbs) Knuckle Clamping Limit |
| Safety Design Factor | 5:1 ASME B30.26 / B30.10 |
Materials Science & Metallurgy Rigging Standard
| Structural Alloy | ASTM A513 Type 5 DOM 1026 Carbon Steel / 6061-T6 Structural Aluminum |
| Section Spec | Cold-Drawn Over Mandrel BWG 14-Gauge (.083" / 2.11mm) |
| Friction Brake Disc | CDA 360 Solid Brass |
| Corrosion Rating | ASTM B841 (1,000+ Hrs Salt Fog) |
Cinema Rigging Physics & Fulcrum Safety
Hollywood Rigging ProtocolsFulcrum Moment Balance
3:1 REAR COUNTERWEIGHTCalculate required counterweight using W_cw = (W_payload Γ L_front + W_arm Γ L_cg) / L_rear. Always secure rear counterweight sandbags or barbell weights with safety linchpins before hoisting lighting fixtures.
1-1/2" Speed-Rail Rigidity
SCHEDULE 40 PIPEStandard 1.900" OD Schedule 40 6061-T6 aluminum pipe delivers a section modulus of Z = 0.326 inΒ³ and moment of inertia Ix = 0.310 in&sup4;, eliminating structural deflection and bending oscillations over extended overhead reaches.
Right-Hand Rigging Invariant
CLOCKWISE GRAVITY LOCKAlways rig cantilevered arms so gravity acts clockwise relative to the T-handle lock. Downward fixture weight actively tightens the brass friction disc against the knuckle, preventing catastrophic slip.
Complete Your Rigging & Boom Setup
Pairs seamlessly with 4-1/2" Lollipop Grip Heads, Heavy Combo Stands, 1-1/2" Speed-Rail pipe, and 25β35 lb heavy saddle sandbags.
Standard Hardware Lifetime Warranty
All Norms rigging hardware and stands are backed by a complete lifetime warranty against manufacturing defects.
Product Info
| Variations | 20" or 30" or 40" or 60" |
| Color | Chrome or Void Black |