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#4-40 Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers - Zinc Plated Steel

#4-40 Phillips Pan Head SEMS Screws

Machine Screws with Pre-Assembled Internal Tooth Lock Washers

  • 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

#4-40 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.

Select Products Below See Product Specifications
NA = "Not Sold In Single Quantity"

Size
Select Package Quantity
SubTotal
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/16"
SKU #8420-004-002
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/16"
SKU #8420-004-002
1
 $0.09 (0.09/ea)
100
 $5.00 (0.05/ea)
1000
 $40.00 (0.04/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1/4"
SKU #8420-004-012
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1/4"
SKU #8420-004-012
1
 $0.10 (0.1/ea)
100
 $6.00 (0.06/ea)
1000
 $50.00 (0.05/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 5/16"
SKU #8420-004-022
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 5/16"
SKU #8420-004-022
1
 $0.11 (0.11/ea)
100
 $6.00 (0.06/ea)
1000
 $50.00 (0.05/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/8"
SKU #8420-004-032
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/8"
SKU #8420-004-032
1
 $0.12 (0.12/ea)
100
 $7.00 (0.07/ea)
1000
 $60.00 (0.06/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 7/16"
SKU #8420-004-042
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 7/16"
SKU #8420-004-042
1
 $0.13 (0.13/ea)
100
 $7.00 (0.07/ea)
1000
 $60.00 (0.06/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1/2"
SKU #8420-004-052
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1/2"
SKU #8420-004-052
1
 $0.13 (0.13/ea)
100
 $7.00 (0.07/ea)
1000
 $60.00 (0.06/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 5/8"
SKU #8420-004-062
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 5/8"
SKU #8420-004-062
1
 $0.14 (0.14/ea)
100
 $8.00 (0.08/ea)
1000
 $70.00 (0.07/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/4"
SKU #8420-004-072
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 3/4"
SKU #8420-004-072
1
 $0.15 (0.15/ea)
100
 $8.00 (0.08/ea)
1000
 $70.00 (0.07/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 7/8"
SKU #8420-004-082
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 7/8"
SKU #8420-004-082
1
 $0.09 (0.09/ea)
100
 $7.00 (0.07/ea)
1000
 $60.00 (0.06/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1"
SKU #8420-004-092
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1"
SKU #8420-004-092
1
 $0.17 (0.17/ea)
100
 $11.00 (0.11/ea)
1000
 $100.00 (0.1/ea)
Subtotal: $0.00 /
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1-1/4"
SKU #8420-004-102
Phillips Pan Head SEMS Screws with Internal Tooth Lock Washers Zinc #4-40 x 1-1/4"
SKU #8420-004-102
1
 $0.16 (0.16/ea)
100
 $14.00 (0.14/ea)
1000
 $120.00 (0.12/ea)
Subtotal: $0.00 /
Product Specifications
ASME
B 1.1
Class
2A
Diameter
#4
Drive Style
Phillips
Finish
Zinc Plated
Grade
Screw: AISI 1022
Washer: SAE 1050-1065
Hardness
Screw: Rockwell B70 - B100
Washer: Rockwell C40 - 50
Head Diameter
Max 0.219 - Min 0.205
Head Height
Max 0.080 - Min 0.070
Head Style
Pan
Material
Steel
Phillips Drive
#1
Product Type
SEMS Machine Screw
Standards Met
ASME B1.1, ASME B18.13, ASME B18.6.3
System of Measurement (Unit)
Inch
Thread Diameter Major
#4 (Max 0.112 - Min 0.1061)
Thread Diameter Minor
#4 (Max 0.095 - Min 0.0925)
Thread Direction
Right Hand
Thread Pitch (Count)
40 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
Washer OD
(Max 0.268 - Max 0.258)
Washer Thickness
(Max 0.018 - Min 0.012)

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Volume Pricing: Buy in volume, get a discount. The larger the pack, the lower the cost per piece. Visit the New Site Features Page for additional details.