{"id":2302,"date":"2026-07-04T11:27:52","date_gmt":"2026-07-04T03:27:52","guid":{"rendered":"https:\/\/metalstampingparts.ltd\/?page_id=2302"},"modified":"2026-07-04T11:27:52","modified_gmt":"2026-07-04T03:27:52","slug":"stamped-spring-clip-set-stress-relaxation-rfq-guide","status":"publish","type":"page","link":"https:\/\/metalstampingparts.ltd\/fil\/stamped-spring-clip-set-stress-relaxation-rfq-guide\/","title":{"rendered":"Stamped Spring Clip Set and Stress Relaxation RFQ Guide"},"content":{"rendered":"

Short answer:<\/strong> Stamped spring clips should be quoted with permanent set and stress relaxation requirements when contact force matters over time. The RFQ should define free height, working height, overtravel, material temper, heat exposure, plating, cycling, storage compression, force measurement points, sample stage, and whether force is checked before and after aging or repeated assembly.<\/p>\n

A spring clip can look correct at first article and still lose force after compression, heat, vibration, or repeated assembly. For grounding clips, battery contacts, EMI fingers, and latch springs, the important question is not only initial height. It is whether the clip still works after the condition it will actually see.<\/p>\n

Use this page with the spring contact force test guide<\/a>, stamped spring clips guide<\/a>, beryllium copper spring contact guide<\/a>, and vibration fatigue validation guide<\/a>.<\/p>\n

Spring clip set and relaxation details<\/h2>\n\n\n\n\n\n\n\n\n
Detail<\/th>\nWhy it matters<\/th>\nRFQ evidence<\/th>\n<\/tr>\n<\/thead>\n
Working height<\/td>\nFree height alone does not prove installed force.<\/td>\nInstalled height, overtravel, contact point, and test direction.<\/td>\n<\/tr>\n
Permanent set<\/td>\nA clip can stay bent after compression and lose contact pressure.<\/td>\nAllowed height loss or force loss after compression.<\/td>\n<\/tr>\n
Heat exposure<\/td>\nCopper alloys, stainless, and plated clips relax differently under heat.<\/td>\nTemperature, time, sample state, and force after aging.<\/td>\n<\/tr>\n
Surface condition<\/td>\nPlating cracks or wear can change resistance while force still looks acceptable.<\/td>\nPlating stack, contact zone, visual limit, and resistance check.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Define force over time, not only shape<\/h2>\n

Many drawings show free height, material thickness, and a few bend dimensions. That is a useful start, but it does not define long-term function. If the clip is compressed in the final product, ask how force will be measured at working height and what happens after the clip stays compressed, sees heat, or is cycled several times.<\/p>\n

Material choice should be tied to the condition. Phosphor bronze, beryllium copper, stainless steel, brass, and plated steel do not behave the same after forming and heat exposure. If the buyer has a required force window, the RFQ should state whether the supplier is responsible for choosing material temper or only making to a supplied drawing.<\/p>\n

Separate compression set from fatigue failure<\/h2>\n

Permanent set and fatigue are related but not identical. A clip can lose height without cracking, or it can crack after repeated travel while still looking fine in a short compression check. The sample plan should match the field risk: storage compression, repeated mating, vibration, heat aging, or one-time assembly overtravel.<\/p>\n

For plated clips, define whether force loss, plating cracks, contact wear, and resistance drift are checked together. A clip that keeps force but develops unstable contact resistance can still fail. For electrical surfaces, connect the plan to the contact resistance guide<\/a> and the fretting corrosion guide<\/a>.<\/p>\n

RFQ details to include<\/h2>\n