Typically, the countersink hole has 3 types degree, 82°, 90° and 135°.
Parameter for countersink hole as below,
1. Countersink hole size is less than 6.5mm can be drilled normally, if the hole size more than 6.5mm, then need to expand the drill, the size controlled by +/-0.15mm. 2. Unbalanced structure can not make countersink hole. 3. Countersink hole board thickness should be no less than 1.2mm, otherwise, special case for judgement. 4. Board thickness ≤2.0mm, depth and size tolerance is +/-0.2mm; Board thickness ＞2.0mm, depth and size tolerance is +/-10%.
Our Advantage (Why us)
Our UL/Rohs standards insure quality assemblies from start to finish. Whether it's a simple custom product or a complex turnkey production run, XingDa will adhere to the highest quality standards.
XingDa offers the latest in assembly capabilities and qualifications insuring that quality is built into every product we produce.
When it comes to your build you want a partner you can depend on. Our management team has over 10years of combined industry knowledge. Our engineering team has over 8 years experience.
Protecting your interests
Protecting your Intellectual Property is job one! Our staff colleague of trained professionals are all working under a strict confidentiality contract and treat your important documentation as they would their own.
XingDa pride ourselves on our ability to custom tailor programs around our customers' needs. We take time to listen to your unique business needs and then set out to surpass them.
Q: What is your delivery policy? A: We guarantee that we will ship at least 100% of your finished PCBA within the promised lead time,unless there is holiday or power failure. The assembly order does not start until the last component is received, so occasionally there are delays in receiving material that are beyond our control and therefore not considered as a late shipment. Q: On turn-key orders, what do about part crossing or substitutions? A: Greenteck holds no inventory, therefore we will not substitute parts on your bill of material with parts we already have. We can suggest crosses or assist with component selection if necessary, but we require customer approval before ordering. Q: How to order components for Turn-Key orders? A :We order to your exact bill of material ordering 3-5% for most components. Occasionally we are faced with minimum / multiple orders where extra components must be purchased. These parts are for approval received from customers prior to ordering.
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