{"product_id":"vlier-ssph55a-threaded-spring-plunger-1-4-28-stainless-steel","title":"Vlier SSPH55A Threaded Spring Plunger 1\/4-28 Stainless Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VLIER SSPH55A is a threaded spring plunger designed to provide repeatable, spring-loaded positioning and indexing force in precision assemblies. Featuring a 1\/4-28 thread with a 1 inch thread length and a stainless steel body and nose, this standard-length plunger delivers an initial end force of 1 pound and a final end force of 4 pounds. The plunger tip diameter measures 0.118 inches with a 3\/16 inch projection. Its stainless steel construction makes it well suited to environments where corrosion resistance and durability are required. Licensed machinists, tooling technicians, and assembly mechanics typically install this type of component during fixture builds or production line setup.\u003c\/p\u003e\u003cp\u003eThis spring plunger is used in tooling fixtures, jigs, machine housings, and precision assemblies where controlled detent or positioning force is needed. The 1\/4-28 fine thread allows for accurate depth adjustment and secure installation in tapped holes. Applications include workholding equipment, dial or selector mechanisms, and any assembly requiring a compact, internally threaded spring-loaded element. With no locking element present, installation torque can be adjusted freely during setup without the resistance of a friction-lock feature.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1\/4-28 fine thread with 1 inch thread length for precise depth control\u003c\/li\u003e\n\u003cli\u003eStainless steel body and nose for corrosion resistance in demanding environments\u003c\/li\u003e\n\u003cli\u003eInitial end force of 1 pound, middle end force of 2.5 pounds, final end force of 4 pounds\u003c\/li\u003e\n\u003cli\u003e3\/16 inch plunger projection with tip diameter range of 0.117 to 0.118 inches\u003c\/li\u003e\n\u003cli\u003eNo locking element, allowing unrestricted torque adjustment during installation\u003c\/li\u003e\n\u003cli\u003eStandard plunger length type for straightforward drop-in replacement or new builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style or new-installation threaded spring plunger for use in any tapped 1\/4-28 bore requiring a standard-length stainless steel spring plunger with a 3\/16 inch projection.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by machinists or assembly technicians using a hex key sized to the 0.079 inch hex drive. Always ensure the receiving tapped hole is clean and dimensionally correct for the 1\/4-28 thread before installation. Do not over-torque the body, as this can compress the spring beyond its rated travel and reduce detent performance. Verify plunger projection and force requirements against the assembly specification before final seating.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-28\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Length\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Length\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlunger Projection\u003c\/strong\u003e: 3\/16 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Plunger Diameter\u003c\/strong\u003e: 0.117 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Plunger Diameter\u003c\/strong\u003e: 0.118 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInitial End Force\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMiddle End Force\u003c\/strong\u003e: 2.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal End Force\u003c\/strong\u003e: 4 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Size\u003c\/strong\u003e: 0.079 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose Material\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking Element\u003c\/strong\u003e: None\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlunger Length Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VLIER\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: SSPH55A\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VLIER","offers":[{"title":"Default Title","offer_id":52041624748338,"sku":"SSPH55A","price":16.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6ffe0e870bd4ef2be590539fc196a090_d8d0651f-b567-46f6-b42b-972cdce1ee9c.jpg?v=1790027844","url":"https:\/\/voomisupply.com\/products\/vlier-ssph55a-threaded-spring-plunger-1-4-28-stainless-steel","provider":"Voomi Supply","version":"1.0","type":"link"}