SEMS Machine Screws, Phillips Pan Head w/ Internal Lock Washer, Zinc Plated Steel, 1/4"-20 x 1/2"
Machine Screws with Pre-Assembled Internal Tooth Lock Washers
| Quantity | Unit price |
|---|---|
| To 99 |
$0.25*
|
| To 999 |
$0.15*
|
| From 1000 |
$0.13*
|
- asme: B 1.1
- Class: 2A
- Color: Blue/Silver
- Diameter: 1/4"
- Drive Style: Phillips
- Elongation: 30%
- Head Type: Pan Head
- Thread Direction: Right Hand
- Thread Type: Coarse
- Finish: Zinc Plated
- Fit: 2A
- Grade: Screw
- Hardness: Screw
- Head Height: (Max 0.175 - Min 0.162)
- Head Diameter: (Max 0.492 - Min 0.473)
- Head Style: Pan
- Length: 1/2"
- Material: Steel
- Phillips Drive: #3
- Product Type: SEMS Machine Screw
- Standards Met: ASME B1.1, ASME B18.13, ASME B18.6.3
- System of Measurement: Inch
- Thread Diameter Major: 1/4" (Max 0.2489 - Min 0.2408)
- Thread Diameter Minor: 1/4" (Max 0.2164 - Min 0.2127)
- Thread Direction: Right Hand
- Thread Pitch: 20 Per Inch
- Thread Size: 1/4"-20
- Thread Standard: UNC
- Thread Type: Coarse
- Tolerance (IFI): Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
- Washer OD: (Max 0.478 - Min 0.466)
- Washer Thickness: (Max 0.028 - Min 0.023)
- Yield PSI: 55,000 - 75,000 PSI
- Machine screws with pre-assembled lock washers
- Features a free-spinning internal tooth lock washer beneath the head
- Internal tooth lock washer provides a clean, finished look and prevents snags
- Single part design saves time and hassle
- Excellent solution for bulk projects of production lines
- Zinc plated steel
1/4"-20 Phillips Pan Head SEMS with Internal Tooth Lock Washers are essentially a pre-assembled machine screws with lock washers (similar to a Keps Nut). The lock washer is beneath the head of the screw and is free-spinning. This pre-assembly saves time and hassle on production lines and in any application where a machine screw with lock washer may be necessary, since they do not need to be put together, and there is no need to worry about losing a screw or washer. Internal tooth lock washers are often used over external for their finished edge that hides the locking teeth for a finished look, or snag prevention for close parts. Because of the integrated lock washer, SEMS screws are often referred to as lock screws, or locking screws.
Frequently Used With
