SEMS Machine Screws, Phillips Pan Head with External Lock Washer, Zinc Plated Steel, 1/4"-28 x 5/8"
Machine Screws with Pre-Assembled External Tooth Lock Washers
| Quantity | Unit price |
|---|---|
| To 99 |
$0.16*
|
| To 999 |
$0.14*
|
| From 1000 |
$0.12*
|
- 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: Fine
- Finish: Zinc Plated
- Fit: 2A
- Grade: AISI 1022
- Hardness: Rockwell B70 - B100
- Head Height: (Max 0.175 - Min 0.162)
- Head Diameter: (Max 0.492 - Min 0.473)
- Head Style: Pan
- Length: 5/8"
- 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: 28 Per Inch
- Thread Size: 1/4"-28
- Thread Standard: UNF
- Thread Type: Fine
- Tolerance (IFI): Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
- Washer OD: (Max 0.510 - Min 0.494)
- 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 external tooth lock washer beneath the head
- Single part design saves time and hassle
- Excellent solution for bulk projects of production lines
- Zinc plated steel
1/4"-28 Phillips Pan Head SEMS with External Tooth Lock Washers are essentially a pre-assembled machine screw with lock washer. 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. External Tooth SEMS screws provide greater torsional resistance than internal tooth lock washers. Because of the integrated lock washer, SEMS screws are often referred to as lock screws, or locking screws.
Frequently Used With
