Rockwood SP1057 Double Cone Head Machine Screw 5/16-18 x 2-1/4" Type 16HD
Rockwood SP1057 Double Cone Head 5/16-18 x 2-1/4" Machine Screw
Does not include set screws (SP1026) - if needed, order separately.
Rockwood SP1057 Double Cone Head Machine Screw | 5/16-18 x 2-1/4"
The Rockwood SP1057 is a high-strength architectural fastener designed specifically for Type 16HD (Heavy Duty) back-to-back mounting. Featuring a Double Cone Head design, this screw is the essential hardware for securing offset pull handles to 1-3/4" thick commercial doors. Its dual-head geometry allows for a seamless, structural connection between two handles, ensuring they remain perfectly aligned and rigid under constant use.
Heavy-Duty Engineering for Commercial Entrances
- Type 16HD Specialized Mounting: This is the primary replacement fastener for Rockwood’s back-to-back offset mounting systems. It enables a secure "sandwich" fit through the door, providing maximum stability for large architectural pulls.
- Superior Strength (HD): As part of the Heavy Duty (HD) line, this screw features a large overall profile and industrial-grade construction to prevent the loosening or wobbling common in high-traffic retail, school, and hospital settings.
- Hex Drive for Positive Tightening: Designed with a socket head for use with a 3/16" Allen wrench. This allows for high-torque "positive tightening," ensuring the hardware stays tight without the risk of stripping the head.
- Vibration Resistant: The thru bolt design is inherently more secure than surface-mounted screws, making it the best choice for doors that experience heavy daily vibration and use.
Technical Specifications
- Model: Rockwood SP1057
- Mounting Type: Type 16HD (Back-to-Back Offset)
- Thread Size: 5/16-18
- Thread Length: 2-1/4"
- Overall Length: 3-1/4"
- Drive: 3/16" Hex (Allen)
- Door Compatibility: Standard 1-3/4" Thick Doors
- Handle Compatibility: Offset Pull Handles
| Brand | Rockwood |
| Thread Pattern | 5/16-18 |
| Screw Type | Double Cone Head |
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