Hunan Jia Shan Hardware Tech Co., Ltd.
admin@jshardwaretech.com
86-0731 -82919092
Product Details
Place of Origin: China
Brand Name: JIA SHAN
Certification: ISO 9001
Model Number: Customized
Payment & Shipping Terms
Minimum Order Quantity: 10
Price: 0.01-11
Packaging Details: plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film/ Customized as your requirements
Delivery Time: 5-15days
Payment Terms: L/C,D/A,D/P,T/T,Western Union,
Supply Ability: 100000
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Material:
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Brass
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Thread Size:
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M6
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Shank Length:
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15mm
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Finish:
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Yellow Plating
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Head Type:
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Thumb Screw
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Thread Type:
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Machined Thread
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Material:
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Brass
|
|
Thread Size:
|
M6
|
|
Shank Length:
|
15mm
|
|
Finish:
|
Yellow Plating
|
|
Head Type:
|
Thumb Screw
|
|
Thread Type:
|
Machined Thread
|
Brass Spade Head Thumb Screw M5 12mm Nickel Plated for Precision Instrument Knob Locking
1,Description:
This Brass Spade Head Thumb Screw with M5 thread and 12mm shank features nickel plating and is custom-designed for precision instrument knob locking. As a specialized hand-operated fastener, its core function is to deliver tool-free clamping, quick positioning and reliable locking without conventional screwdrivers, wrenches or power tools, which makes it indispensable for precision equipment adjustment workflows.
Fabricated from premium brass, this thumb screw boasts excellent machinability, stable mechanical properties and natural ductility. It resists galling when repeatedly mated with internal brass or alloy threads inside precision instruments and avoids seizing after frequent tightening and loosening cycles. The uniform nickel plating covers the entire surface, offering bright aesthetic quality, good wear resistance and moderate anti-tarnish protection. This coating prevents the brass base from oxidation and discoloration when exposed to indoor ambient air, fingerprints and light humidity, maintaining a neat appearance and stable surface friction for long-term manual operation.
The standout spade head design defines its function as a thumb screw. The two extended flat spade wings create a broad grip surface for fingertips. Operators can apply direct rotational force by hand to lock or release instrument knobs in seconds. This eliminates the hassle of fetching matching hand tools during fine calibration. For precision instruments, frequent parameter tuning and knob repositioning are routine operations. This thumb screw enables technicians to lock the knob instantly once the target reading or position is reached, preventing accidental shifting caused by vibration or light contact. Its hand-tightening feature also lets users control clamping force subjectively, avoiding over-torque damage to delicate instrument components that often happens with power-driven fasteners.
The precisely rolled M5 metric thread with a 12mm working length ensures consistent, smooth thread meshing. Thread pitch tolerance is tightly controlled to guarantee steady engagement with threaded inserts integrated into instrument housings and knobs. There is no thread jamming or loose backlash that would compromise positioning accuracy. When loosened slightly, the knob can slide or rotate freely for adjustment; once hand-tightened, friction between contact faces secures the knob firmly in the calibrated position.
3,Technical Advantages
It is widely adopted on optical testers, laboratory gauges, small analytical meters and desktop precision measuring instruments. In these applications, stable knob locking directly determines measurement repeatability and reading reliability. Compared to standard socket head screws, this brass spade head thumb screw streamlines calibration operations significantly. It balances locking security, adjustability and ease of use, serving as a critical functional fastener that bridges fine adjustment and position retention for precision instrument knobs.
Available in small packing, carton packing, or pallet configurations to meet your shipping and storage requirements.
Manufactured by JIA SHAN Hardware Company with strict quality control measures and pre-shipment inspection.
