4-40 x 5/16" Round Head Slotted Machine Screw SUS304 Stainless Steel Inox

MRL0405S is a 4-40 Round Head head Slot drive screw made of SUS304 Stainless Steel, manufactured by Superneer Limited. It has a length of 5/16 inches and is commonly used in electronics, watches, precision instruments, and 3D printers.

The MRL0405S screw features thread size 4-40, length of 5/16 inches, head type Round Head (head diameter 0.193-0.211 inches), drive type Slot (drive size 0.031-0.039" width), and is made of SUS304 Stainless Steel.

The MRL0405S screw is made of SUS304 Stainless Steel. Superneer provides material test reports (MTR) and RoHS compliance certificates for all products. SUS304 Stainless Steel offers excellent corrosion resistance and mechanical strength.

The MRL0405S screw has a 4-40 thread. This is a UNC (Unified National Coarse) thread with 4-40 specification, widely used in North American applications.

MRL0405S Round Head head Slot drive screws are used in electronics assembly, PCB mounting, precision instruments, watches, 3D printers, optical devices, medical equipment, and consumer products where reliable fastening with Round Head head aesthetics is required.

The minimum order quantity (MOQ) for MRL0405S is 10,000 pieces. The unit price is $0.026 USD for MOQ quantity. Larger quantities receive discounted pricing. Contact [email protected] for custom quotes.

The lead time for MRL0405S is 15-25 days for production. Shipping to USA takes 5-15 days via sea freight, with shipping cost starting from $50 USD. Air freight is available for urgent orders. DDP and FOB terms are both available.

The 4-40 thread is approximately equivalent to M2.5 to M3 (approx). When substituting inch screws with metric screws, always verify the actual diameter and pitch compatibility.

The MRL0405S uses a Round Head head type. Round Head head provides a specific head design optimized for its intended application. This head type is selected based on the specific application requirements for load distribution, aesthetics, and accessibility.

To choose the right screw: 1) Determine the required thread size based on the tapped hole or nut; 2) Select the appropriate length based on the material thickness; 3) Choose the head type based on clearance and aesthetics; 4) Select the drive type based on torque requirements; 5) Choose the material based on environmental conditions. For MRL0405S (4-40, 5/16 inches), ensure your application requires this specific size.

MRL0405S uses SUS304 Stainless Steel finish, while alternative variants in the same thread/length specification include MRL0405Z (Blue Zinc Plated Steel), MRL0405B (Black Zinc Plated Steel). The SUS304 Stainless Steel of MRL0405S is specifically selected because it offers superior corrosion resistance for outdoor, marine, and humid environments, excellent hygiene properties for food and medical equipment, and good mechanical strength at low cost relative to exotic alloys. This distinction makes MRL0405S the preferred choice when these properties align with your application requirements.