{"product_id":"electro-hardware-ths1004m01f21-brass-thumb-screw-4-40","title":"Electro Hardware THS1004M01F21 Brass Thumb Screw 4-40","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ELECTRO HARDWARE THS1004M01F21 is a brass thumb screw with a knurled head and shoulder, designed for hand-tightened fastening applications in mechanical assemblies, enclosures, and panel work. Threaded to 4-40 UNC, it delivers reliable engagement in fine-threaded applications without the need for tools. The knurled head provides a secure grip for repeated removal and reinstallation. At 0.75 inches overall length and a head diameter of 0.375 inches, this fastener suits tight-clearance installations where a standard slotted or hex fastener is not practical. It carries a zinc finish over a solid brass body.\u003c\/p\u003e\n\u003cp\u003eThis thumb screw is suited for light-duty industrial, electrical, and instrumentation panel assembly where hand-operated fastening is required. The integral shoulder provides positive seating and helps prevent over-insertion. Typical applications include equipment covers, access panels, junction boxes, and fixture mounting in settings where tools may not be available or frequent access is needed by technicians and assembly personnel.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4-40 UNC thread for fine-threaded engagement in light-duty assemblies\u003c\/li\u003e\n  \u003cli\u003eKnurled head allows tool-free hand tightening and removal\u003c\/li\u003e\n  \u003cli\u003eWith-shoulder design provides positive seating and controlled insertion depth\u003c\/li\u003e\n  \u003cli\u003eSolid brass construction with zinc finish for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eCompact head profile: 0.375 inches diameter, 0.1875 inches height\u003c\/li\u003e\n  \u003cli\u003eMeets multiple material and finish standards including ASTM B633\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in applications requiring a 4-40 UNC threaded thumb screw with a knurled head and shoulder. Suitable for standard inch-measurement threaded inserts and tapped holes conforming to UNC 4-40 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation requires no special tools — the knurled head is intended for hand tightening only. Verify the mating thread is clean and free of debris before installation to avoid cross-threading the fine 4-40 thread. Do not apply excessive torque, as over-tightening a hand-turn fastener can damage the threads or the mating material. Follow applicable assembly standards for the equipment type being serviced.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Type\u003c\/strong\u003e: Knurled\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Type\u003c\/strong\u003e: With Shoulder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Diameter\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Height\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Diameter\u003c\/strong\u003e: 0.312 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShoulder Length\u003c\/strong\u003e: 0.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Material\u003c\/strong\u003e: Brass\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ASTM B633; QQ-A-225A Comp 2; QQ-B-626B Comp 22; QQ-N-290A; QQ-S-633; QQ-S-763; T-3; Type 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161516\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ELECTRO HARDWARE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: THS1004M01F21\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ELECTRO HARDWARE","offers":[{"title":"Default Title","offer_id":51733387804978,"sku":"THS1004M01F21","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/089603be8ed25c382e5b06b448da7164_7b08e4e7-68e1-4723-be36-ce6980340d86.jpg?v=1788755044","url":"https:\/\/voomisupply.com\/products\/electro-hardware-ths1004m01f21-brass-thumb-screw-4-40","provider":"Voomi Supply","version":"1.0","type":"link"}