Home Standoff Male Female Round Spacer Diameter 4.5mm M3 x 21mm Round Spacers SUS303 Stainless Steel Inox Male Female Standoffs Screws

M3 x 21mm Round Spacers SUS303 Stainless Steel Inox Male Female Standoffs Screws

Screw
Screw
Part No. OR45MFM321S rohs Rating:

material Sus303 Stainless Steel
Ship Date 2026-11-20
Thread M3
Length 21 mm
Unit Price USD$ 0.179 /pcs
Unit Weight 2.531 g
Quantity pcs
Amount USD$ Total Amount USD$
Amount USD$ Total Amount USD$
  
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Item Information

Why Choose OR45MFM321S?

OR45MFM321S is a M3 head drive screw with 21 mm length, featuring a SUS303 Stainless Steel finish. Compared to alternative finishes in the same specification such as OR45MFM321B (Brass), OR45MFM321Z (Steel Blue Zinc Plated), the SUS303 Stainless Steel of OR45MFM321S 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. The head design ensures optimal load distribution across the mating surface, while the drive allows efficient torque transmission during installation. Each OR45MFM321S screw is manufactured to industry standards, RoHS compliant, and supplied with material test reports (MTR) for full quality traceability.

M3 x 21mm Round Spacers SUS303 Stainless Steel Inox Male Female Standoffs Screws
OR45MFM321S This part demension will be same as the drawing indicate below, length tolerance will be ±0.5 .
It is with drive, M3 Thread and 21 mm Length .
material SUS303 Stainless Steel, Finsh is Rohs which has good function of anti-corrosion .
On website, you can choose use your shipping account which shippcost is 0, or you can use our DHL/UPS account to ship which will have ship cost indicate.
Payment terms: Payment advance, On website, you can choose pay via paypal or pay via bank transfer. when bank transfer , you can send your bank slip to us via order process or send it to our email:[email protected]. when payment made, We will soon make production and update process for you via email.
BUY OR45MFM321S - M3 x 21mm Round Spacers SUS303 Inox Male Female Standoffs Screws - 303 Stainless Steel for PCB Spacing | Superneer today,high quality product and best service will be provided by superneer.Each order will be made shippment on time.
Different Finish :
M3 x 21 mm
M3 x 21 mm
OR45MFM321B
Brass
M3 x 21 mm
M3 x 21 mm
OR45MFM321S
SUS303 Stainless Steel
M3 x 21 mm
M3 x 21 mm
OR45MFM321Z
Steel Blue Zinc Plated
Item Drawing
M3 x 21mm Round Spacers SUS303 Stainless Steel Inox Male Female Standoffs Screws
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M3 x 4mm screw M3 x 4mm Torx Flat Head Machine Screw Carbon Steel Black Oxide
standoff 2-56 x 13/32" Standoff Screw with 7/32" Outer Thread Length SUS303 Stainless Steel Hex Male Female Spacers
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SEMS Screw M3 x 10 mm Button Head Socket SEMS Screw with Internal Tooth Washer Steel Black Oxide
Payment & Trasportation 5-10 days

Payment Method: T/T & Paypal and other payment method

Shipment Method: Air Express , Air Freight, Sea Shippment

How to Order

1. Order online directly, made payment via Paypal or bank transfer.

2. Superneer arrange production according to drawing,all demensions are within drawing specification.

3. Parts ready, ship to customer.

Frequently Asked Questions about OR45MFM321S

What is OR45MFM321S screw?

OR45MFM321S is a M3 head drive screw made of SUS303 Stainless Steel, manufactured by Superneer Limited. It has a length of 21 mm and is commonly used in electronics, watches, precision instruments, and 3D printers.

What are the specifications of OR45MFM321S?

The OR45MFM321S screw features thread size M3, length of 21 mm, head type (head diameter N/A mm), drive type (drive size N/A), and is made of SUS303 Stainless Steel.

What material is the OR45MFM321S screw made of?

The OR45MFM321S screw is made of SUS303 Stainless Steel. Superneer provides material test reports (MTR) and RoHS compliance certificates for all products. SUS303 Stainless Steel offers excellent corrosion resistance and mechanical strength.

What is the thread size of OR45MFM321S?

The OR45MFM321S screw has a M3 thread. This is a metric thread with M3 specification, commonly used in international applications following ISO standards.

What are OR45MFM321S screws used for?

OR45MFM321S head 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 head aesthetics is required.

What is the MOQ and price for OR45MFM321S?

The minimum order quantity (MOQ) for OR45MFM321S is 10,000 pieces. The unit price is $0.179 USD for MOQ quantity. Larger quantities receive discounted pricing. Contact [email protected] for custom quotes.

What is the lead time and shipping for OR45MFM321S?

The lead time for OR45MFM321S 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.

What is the inch equivalent of M3 thread?

The M3 thread is approximately equivalent to #6 (approx 6-32). When substituting metric screws with inch screws, always verify the actual diameter and pitch compatibility.

What head type does OR45MFM321S use and why?

The OR45MFM321S uses a head type. 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.

How to choose the right screw size for my application?

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 OR45MFM321S (M3, 21 mm), ensure your application requires this specific size.

What is the difference between OR45MFM321S and similar parts?

OR45MFM321S uses SUS303 Stainless Steel finish, while alternative variants in the same thread/length specification include OR45MFM321B (Brass), OR45MFM321Z (Steel Blue Zinc Plated). The SUS303 Stainless Steel of OR45MFM321S 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 OR45MFM321S the preferred choice when these properties align with your application requirements.

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