Kerr Lakeside
Kerr Lakeside 1/4-20 x 1/2 in. Flat Head Socket Screw 100 pcs
Pack of 100 alloy-steel flat-head socket screws, 1/4-20 x 1/2 in., black-oxide finish, Rc 38-43 hardness, 180,000 psi tensile strength, ASTM A574/ANSI B18.3 compliant
- Flat head sits flush in countersunk holes
- 180,000 psi tensile strength from alloy steel
- Rockwell hardness Rc 38-43 resists wear
- Meets ASTM A574 and ANSI B18.3 standards
- 100-piece pack in compact 1.5 x 1.88 x 3.13 in. box
Flat-head socket screws in bulk
Kerr Lakeside supplies 100 pieces of 1/4-20 by 1/2 inch flat-head socket cap screws. Each fastener is made from alloy steel with a black oxide finish and a Rockwell hardness of 38-43. The coarse UNC thread runs the full half-inch length. They meet ASTM A574 and ANSI B18.3 standards and are RoHS compliant.
Ideal for mechanics and assembly work
These screws suit anyone needing a ready stock of high-strength inch-series fasteners with a hex drive. Buyers who require metric threads, a different head style, or a smaller pack quantity should look elsewhere. The 0.84 lb pack measures 1.5 by 1.88 by 3.13 inches.
Tensile strength rated at 180000 psi
The alloy steel construction delivers a tensile strength of 180000 pounds per square inch, confirming suitability for demanding clamping loads. This single figure decides whether the fastener matches the joint design requirements.
Highlights
- Flat head sits flush in countersunk holes
- 180,000 psi tensile strength from alloy steel
- Rockwell hardness Rc 38-43 resists wear
- Meets ASTM A574 and ANSI B18.3 standards
- 100-piece pack in compact 1.5 x 1.88 x 3.13 in. box
Specifications
| Brand | Prospect Fastener |
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Questions about this item
Will these 1/4-20 x 1/2 in. flat head socket screws sit flush in a countersunk hole made for standard ANSI B18.3 hardware?
Yes. The flat head follows ANSI B18.3 dimensions so it seats flush in a standard countersink. The black-oxide alloy steel body meets ASTM A574 and has a Rockwell hardness of RC 38-43.
Can I mix these coarse-thread UNC screws with existing 1/4-20 UNC fasteners in the same assembly?
Yes. They share the same 1/4-20 UNC coarse thread and right-hand thread direction, so they engage identically with existing nuts or tapped holes.
How can I confirm the 100-piece pack contains the correct 1/4-20 x 1/2 in. flat head socket screws after opening?
Each screw shows a 1/4 in. hex drive, flat head, full 1/2 in. thread length and black-oxide finish. The pack weighs about 0.84 lbs and measures 1.5 x 1.88 x 3.13 in.
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