
A PEEK fastening-accessory range for research instruments, analytical equipment, electrochemical fixtures, and laboratory assemblies. The current list contains 25 specifications: 12 nut models and 13 flat-washer models spanning metric sizes from M2 through M20.
This accessory range groups PEEK metric nuts and flat washers by M-size for easier matching with PEEK screws, laboratory fixtures, and instrument structures. Confirm the mating thread first, then determine whether a nut, flat washer, or both are required for the assembly.
This accessory range groups PEEK metric nuts and flat washers by M-size for easier matching with PEEK screws, laboratory fixtures, and instrument structures. Confirm the mating thread first, then determine whether a nut, flat washer, or both are required for the assembly.
Combine the available product-type and metric-size filters to narrow the specification table.
| Model / Specification | Product Type | Metric Size | Combination Qty. | Reference Qty. |
|---|---|---|---|---|
| M2 Nut | Nut | M2 | — | 1000 |
| M2 Flat Washer (2 pcs) | Flat Washer | M2 | 2 pcs | 1000 |
| M2.5 Nut | Nut | M2.5 | — | 1000 |
| M2.5 Flat Washer (2 pcs) | Flat Washer | M2.5 | 2 pcs | 1000 |
| M3 Nut | Nut | M3 | — | 1000 |
| M3 Flat Washer (2 pcs) | Flat Washer | M3 | 2 pcs | 1000 |
| M4 Nut | Nut | M4 | — | 1000 |
| M4 Flat Washer (1 pcs) | Flat Washer | M4 | 1 pcs | 1000 |
| M5 Nut | Nut | M5 | — | 1000 |
| M5 Flat Washer (1 pcs) | Flat Washer | M5 | 1 pcs | 1000 |
| M6 Nut | Nut | M6 | — | 1000 |
| M6 Flat Washer (1 pcs) | Flat Washer | M6 | 1 pcs | 1000 |
| M8 Nut | Nut | M8 | — | 1000 |
| M8 Flat Washer (1 pcs) | Flat Washer | M8 | 1 pcs | 1000 |
| M10 Nut | Nut | M10 | — | 1000 |
| M10 Flat Washer (1 pcs) | Flat Washer | M10 | 1 pcs | 1000 |
| M12 Nut | Nut | M12 | — | 1000 |
| M12 Flat Washer (1 pcs) | Flat Washer | M12 | 1 pcs | 1000 |
| M14 Flat Washer (1 pcs) | Flat Washer | M14 | 1 pcs | 1000 |
| M16 Nut | Nut | M16 | — | 1000 |
| M16 Flat Washer (1 pcs) | Flat Washer | M16 | 1 pcs | 1000 |
| M18 Nut | Nut | M18 | — | 1000 |
| M18 Flat Washer (1 pcs) | Flat Washer | M18 | 1 pcs | 1000 |
| M20 Nut | Nut | M20 | — | 1000 |
| M20 Flat Washer (1 pcs) | Flat Washer | M20 | 1 pcs | 1000 |
Review the entire model list in one table for BOM preparation and repeat ordering.
| Model / Specification | Product Type | Metric Size | Combination Qty. | Reference Qty. | System |
|---|---|---|---|---|---|
| M2 Nut | Nut | M2 | — | 1000 | Metric |
| M2 Flat Washer (2 pcs) | Flat Washer | M2 | 2 pcs | 1000 | Metric |
| M2.5 Nut | Nut | M2.5 | — | 1000 | Metric |
| M2.5 Flat Washer (2 pcs) | Flat Washer | M2.5 | 2 pcs | 1000 | Metric |
| M3 Nut | Nut | M3 | — | 1000 | Metric |
| M3 Flat Washer (2 pcs) | Flat Washer | M3 | 2 pcs | 1000 | Metric |
| M4 Nut | Nut | M4 | — | 1000 | Metric |
| M4 Flat Washer (1 pcs) | Flat Washer | M4 | 1 pcs | 1000 | Metric |
| M5 Nut | Nut | M5 | — | 1000 | Metric |
| M5 Flat Washer (1 pcs) | Flat Washer | M5 | 1 pcs | 1000 | Metric |
| M6 Nut | Nut | M6 | — | 1000 | Metric |
| M6 Flat Washer (1 pcs) | Flat Washer | M6 | 1 pcs | 1000 | Metric |
| M8 Nut | Nut | M8 | — | 1000 | Metric |
| M8 Flat Washer (1 pcs) | Flat Washer | M8 | 1 pcs | 1000 | Metric |
| M10 Nut | Nut | M10 | — | 1000 | Metric |
| M10 Flat Washer (1 pcs) | Flat Washer | M10 | 1 pcs | 1000 | Metric |
| M12 Nut | Nut | M12 | — | 1000 | Metric |
| M12 Flat Washer (1 pcs) | Flat Washer | M12 | 1 pcs | 1000 | Metric |
| M14 Flat Washer (1 pcs) | Flat Washer | M14 | 1 pcs | 1000 | Metric |
| M16 Nut | Nut | M16 | — | 1000 | Metric |
| M16 Flat Washer (1 pcs) | Flat Washer | M16 | 1 pcs | 1000 | Metric |
| M18 Nut | Nut | M18 | — | 1000 | Metric |
| M18 Flat Washer (1 pcs) | Flat Washer | M18 | 1 pcs | 1000 | Metric |
| M20 Nut | Nut | M20 | — | 1000 | Metric |
| M20 Flat Washer (1 pcs) | Flat Washer | M20 | 1 pcs | 1000 | Metric |
The listed specification is recorded as a two-piece flat-washer combination for M3.
The current specification list includes an M14 flat washer but no M14 nut, so no additional nut model is assumed.
Yes. Provide the complete M-size and quantity list so matching components can be reviewed together.
Confirm the mating screw or thread size, required quantity, assembly geometry, and any special operating requirements.
Standard configurations can be selected by thread size and specification. For mixed-size orders, project quantities, or application-specific requirements, include the requested model, dimensions, quantity, operating environment, and mating components so the selection can be reviewed efficiently.
Specifications are provided for model selection. Availability, final pricing, shipping, suitability, and delivery terms are subject to the current marketplace listing or formal quotation.
25 standard PEEK nut and flat-washer specifications covering M2–M20. Filter by product type, metric size, and USD reference price, then purchase through Amazon or eBay or request direct support for mixed-size, bulk, and project requirements.
Confirm the required component type and mating M-size before comparing price. For screw models, length should be confirmed from assembly thickness and required thread engagement.
Combine the available filters to narrow the standard model list and compare reference USD pricing.
| Model / Specification | Product Type | Metric Size | Combination Qty. | Reference Price | Reference Qty. | Purchase |
|---|---|---|---|---|---|---|
| M2 Nut | Nut | M2 | — | $3 | 1000 | Amazon eBay |
| M2 Flat Washer (2 pcs) | Flat Washer | M2 | 2 pcs | $2 | 1000 | Amazon eBay |
| M2.5 Nut | Nut | M2.5 | — | $3 | 1000 | Amazon eBay |
| M2.5 Flat Washer (2 pcs) | Flat Washer | M2.5 | 2 pcs | $2 | 1000 | Amazon eBay |
| M3 Nut | Nut | M3 | — | $3 | 1000 | Amazon eBay |
| M3 Flat Washer (2 pcs) | Flat Washer | M3 | 2 pcs | $2 | 1000 | Amazon eBay |
| M4 Nut | Nut | M4 | — | $3 | 1000 | Amazon eBay |
| M4 Flat Washer (1 pcs) | Flat Washer | M4 | 1 pcs | $2 | 1000 | Amazon eBay |
| M5 Nut | Nut | M5 | — | $3 | 1000 | Amazon eBay |
| M5 Flat Washer (1 pcs) | Flat Washer | M5 | 1 pcs | $2 | 1000 | Amazon eBay |
| M6 Nut | Nut | M6 | — | $3 | 1000 | Amazon eBay |
| M6 Flat Washer (1 pcs) | Flat Washer | M6 | 1 pcs | $2 | 1000 | Amazon eBay |
| M8 Nut | Nut | M8 | — | $4 | 1000 | Amazon eBay |
| M8 Flat Washer (1 pcs) | Flat Washer | M8 | 1 pcs | $2 | 1000 | Amazon eBay |
| M10 Nut | Nut | M10 | — | $4 | 1000 | Amazon eBay |
| M10 Flat Washer (1 pcs) | Flat Washer | M10 | 1 pcs | $2 | 1000 | Amazon eBay |
| M12 Nut | Nut | M12 | — | $4 | 1000 | Amazon eBay |
| M12 Flat Washer (1 pcs) | Flat Washer | M12 | 1 pcs | $2 | 1000 | Amazon eBay |
| M14 Flat Washer (1 pcs) | Flat Washer | M14 | 1 pcs | $2 | 1000 | Amazon eBay |
| M16 Nut | Nut | M16 | — | $5 | 1000 | Amazon eBay |
| M16 Flat Washer (1 pcs) | Flat Washer | M16 | 1 pcs | $3 | 1000 | Amazon eBay |
| M18 Nut | Nut | M18 | — | $6 | 1000 | Amazon eBay |
| M18 Flat Washer (1 pcs) | Flat Washer | M18 | 1 pcs | $3 | 1000 | Amazon eBay |
| M20 Nut | Nut | M20 | — | $8 | 1000 | Amazon eBay |
| M20 Flat Washer (1 pcs) | Flat Washer | M20 | 1 pcs | $3 | 1000 | Amazon eBay |
The current model list includes an M14 flat washer record but no corresponding M14 nut record.
Yes. Provide the complete metric-size and quantity list so matching components can be reviewed together.
They are reference prices for comparison. Marketplace pricing, shipping, taxes, quantity, and availability may change.
It indicates that the listed flat-washer specification is recorded as a two-piece combination.
Standard configurations can be selected by thread size and specification. For mixed-size orders, project quantities, or application-specific requirements, include the requested model, dimensions, quantity, operating environment, and mating components so the selection can be reviewed efficiently.
Specifications are provided for model selection. Availability, final pricing, shipping, suitability, and delivery terms are subject to the current marketplace listing or formal quotation.
Partial references citing our materials (from Google Scholar)

Carbon Dioxide Reduction
1. ACS Nano Strain Relaxation in Metal Alloy Catalysts Steers the Product Selectivity of Electrocatalytic CO2 Reduction
The bipolar membrane (Fumasep FBM) in this paper was purchased from SCI Materials Hub, which was used in rechargeable Zn-CO2 battery tests. The authors reported a strain relaxation strategy to determine lattice strains in bimetal MNi alloys (M = Pd, Ag, and Au) and realized an outstanding CO2-to-CO Faradaic efficiency of 96.6% with outstanding activity and durability toward a Zn-CO2 battery.
2. Front. Chem. Boosting Electrochemical Carbon Dioxide Reduction on Atomically Dispersed Nickel Catalyst
In this paper, Vulcan XC-72R was purchased from SCI Materials Hub. Vulcan XC 72R carbon is the most common catalyst support used in the anode and cathode electrodes of Polymer Electrolyte Membrane Fuel Cells (PEMFC), Direct Methanol Fuel Cells (DMFC), Alkaline Fuel Cells (AFC), Microbial Fuel Cells (MFC), Phosphoric Acid Fuel Cells (PAFC), and many more!
3. Adv. Mater. Partially Nitrided Ni Nanoclusters Achieve Energy-Efficient Electrocatalytic CO2 Reduction to CO at Ultralow Overpotential
An AEM membrane (Sustainion X37-50 Grade RT, purchased from SCI Materials Hub) was activated in 1 M KOH for 24 h, washed with ultra-purity water prior to use.
4. Adv. Funct. Mater. Nanoconfined Molecular Catalysts in Integrated Gas Diffusion Electrodes for High-Current-Density CO2 Electroreduction
In this paper (Supporting Information), an anion exchanged membrane (Fumasep FAB-PK-130 obtained from SCI Materials Hub (www.scimaterials.cn)) was used to separate the catholyte and anolyte chambers.
SCI Materials Hub: we also recommend our Fumasep FAB-PK-75 for the use in a flow cell.
5. Appl. Catal. B Efficient utilization of nickel single atoms for CO2 electroreduction by constructing 3D interconnected nitrogen-doped carbon tube network
In this paper, the Nafion 117 membrane was obtained from SCI Materials Hub.
In this paper, Proton exchange membrane (Nafion 117), Nafion D520, and Toray 060 carbon paper were purchased from SCI Materials Hub.
7. National Science Review Confinement of ionomer for electrocatalytic CO2 reduction reaction via efficient mass transfer pathways
An anion exchange membrane (PiperION-A15-HCO3) was obtained from SCI Materials Hub.
8. Catalysis Communications Facilitating CO2 electroreduction to C2H4 through facile regulating {100} & {111} grain boundary of Cu2O
Carbon paper (TGPH060), membrane solution (Nafion D520), and ionic membrane (Nafion N117) were obtained from Wuhu Eryi Material Technology Co., Ltd (a company under SCI Materials Hub).
Batteries
1. J. Mater. Chem. A Blocking polysulfides with a Janus Fe3C/N-CNF@RGO electrode via physiochemical confinement and catalytic conversion for high-performance lithium–sulfur batteries
Graphene oxide (GO) in this paper was obtained from SCI Materials Hub. The authors introduced a Janus Fe3C/N-CNF@RGO electrode consisting of 1D Fe3C decorated N-doped carbon nanofibers (Fe3C/N-CNFs) side and 2D reduced graphene oxide (RGO) side as the free-standing carrier of Li2S6 catholyte to improve the overall electrochemical performance of Li-S batteries.
This paper used more than 10 kinds of materials from SCI Materials Hub and the authors gave detailed properity comparsion.
The commercial IEMs of Fumasep FAB-PK-130 and Nafion N117 were obtained from SCI Materials Hub.
Gas diffusion layers of GDL340 (CeTech) and SGL39BC (Sigracet) and Nafion dispersion (Nafion D520) were obtained from SCI Materials Hub.
Zn foil (100 mm thickness) and Zn powder were obtained from the SCI Materials Hub.
Commercial 20% Pt/C, 40% Pt/C and IrO2 catalysts were also obtained from SCI Materials Hub.
3. Journal of Energy Chemistry Vanadium oxide nanospheres encapsulated in N-doped carbon nanofibers with morphology and defect dual-engineering toward advanced aqueous zinc-ion batteries
In this paper, carbon cloth (W0S1011) was obtained from SCI Materials Hub. The flexible carbon cloth matrix guaranteed the stabilization of the electrode and improved the conductivity of the cathode.
4. Energy Storage Materials Defect-abundant commercializable 3D carbon papers for fabricating composite Li anode with high loading and long life
The 3D carbon paper (TGPH060 raw paper) were purchased from SCI Materials Hub.
5. Nanomaterials A Stable Rechargeable Aqueous Zn–Air Battery Enabled by Heterogeneous MoS2 Cathode Catalysts
Nafion D520 (5 wt%), and carbon paper (GDL340) were received from SCI-Materials-Hub.
Carbon cloth (W0S1011) and other electrochemical consumables required for air cathode were provided by SCI Materials Hub.
Oxygen Reduction Reaction
1. J. Chem. Eng. Superior Efficiency Hydrogen Peroxide Production in Acidic Media through Epoxy Group Adjacent to Co-O/C Active Centers on Carbon Black
In this paper, Vulcan XC 72 carbon black, ion membrane (Nafion N115, 127 μL), Nafion solution (D520, 5 wt%), and carbon paper (AvCarb GDS 2230 and Spectracarb 2050A-1050) were purchased from SCI Materials Hub.
2. Journal of Colloid and Interface Science Gaining insight into the impact of electronic property and interface electrostatic field on ORR kinetics in alloy engineering via theoretical prognostication and experimental validation
The 20 wt% Pt3M (M = Cr, Co, Cu, Pd, Sn, and Ir) were purchased from SCI Materials Hub. This work places emphasis on the kinetics of the ORR concerning Pt3M (M = Cr, Co, Cu, Pd, Sn, and Ir) catalysts, and integrates theoretical prognostication and experimental validation to illuminate the fundamental principles of alloy engineering.
Water Electrolysis
1. International Journal of Hydrogen Energy Gold as an efficient hydrogen isotope separation catalyst in proton exchange membrane water electrolysis
The cathodic catalysts of Pt/C (20 wt%, 2–3 nm) and Au/C (20 wt%, 4–5 nm) were purchased from SCI Materials Hub.
2. Small Science Silver Compositing Boosts Water Electrolysis Activity and Durability of RuO2 in a Proton-Exchange-Membrane Water Electrolyzer
Two fiber felts (0.35 mm thickness, SCI Materials Hub) were used as the porous transport layers at both the cathode and the anode.
3. Advanced Functional Materials Hierarchical Crystalline/Amorphous Heterostructure MoNi/NiMoOx for Electrochemical Hydrogen Evolution with Industry-Level Activity and Stability
Anion-exchange membrane (FAA-3-PK-130) was obtained from SCI Materials Hub website.
Fuel Cells
1. Polymer Sub-two-micron ultrathin proton exchange membrane with reinforced mechanical strength
Gas diffusion electrode (60% Pt/C, Carbon paper) was purchased from SCI Materials Hub.
Characterization
1. Chemical Engineering Journal Electrochemical reconstitution of Prussian blue analogue for coupling furfural electro-oxidation with photo-assisted hydrogen evolution reaction
An Au nanoparticle film was deposited on the total reflecting plane of a single reflection ATR crystal (SCI Materials Hub, Wuhu, China) via sputter coater.
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