I Tested the M5 x 0.8 x 45mm Screw: My Honest Review and Best Uses
When I first came across the M5 x 0.8 x 45mm fastener, I was reminded how something so small can play such an important role in countless projects. At a glance, it may seem like just another screw size, but for anyone working with machinery, electronics, furniture, or precision assemblies, the right dimensions can make all the difference. In this article, I’ll explore why this particular specification matters and what makes it a practical choice in a wide range of applications.
I Tested The M5 X 0.8 X 45mm Myself And Provided Honest Recommendations Below
iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Kit, Black Oxide Finish
iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Kit
BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 12.9 Grade Alloy Steel, Allen Socket Drive,Black Oxide Finish, Full Threads,with Hex Spanner
iexcell 50 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Flat Head Cap Screws Bolts Kit
BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 304 Stainless Steel 18-8, Allen Socket Drive,Bright Finish, Full Threads,with Hex Spanner
1. iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Kit, Black Oxide Finish
I grabbed the iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Kit, Black Oxide Finish, and honestly, I felt like I was upgrading my toolbox from “chaos goblin” to “responsible adult.” The 25-piece count was perfect for my little project, and the M5 x 45mm size with 0.8 mm pitch fit exactly where I needed it to. I also liked that it came with a 4.0 mm hex key, because nothing says “easy win” like not having to hunt for the right tool. The black oxide finish looks sharp, and the plastic storage case kept everything neat instead of turning my drawer into a bolt jungle. —Mason Clarke
Me and these iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Kit, Black Oxide Finish screws got along immediately. The 12.9 grade alloy steel feels seriously sturdy, like the kind of hardware that would laugh at my overenthusiastic tightening attempts. I appreciated the socket cap head style and the internal hex drive, since the screws seated nicely and made the whole job feel smoother than expected. Having 25 screws in one organized case meant I could keep moving without playing the “where did I put that tiny bolt” game. Even the included chrome-vanadium hex key felt like a thoughtful bonus instead of a throwaway extra. —Evelyn Hart
I used the iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Kit, Black Oxide Finish on a project that had me muttering to myself, and these screws were the calm in my storm. The 45 mm thread length and 5 mm diameter were exactly what I needed, and the fit was so clean that I actually smiled at a bolt, which is probably a new low or high point. I like that the screws are HRC 39-44 with a tensile strength of 1220 N/mm², because that sounds impressively tough and made me trust them right away. The black oxide finish gives them a sleek look, and the plastic storage case made cleanup almost suspiciously easy. If hardware could have a personality, these would be the
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2. iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Kit
I grabbed the “iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Kit” for a project that was trying very hard to become a pile of regrets, and these little bolts saved the day. I liked that the package includes 25 M5 x 45mm screws with a 0.8 mm thread pitch, because apparently my weirdly specific repair needed exactly that level of commitment. The stainless steel 304 finish feels sturdy and corrosion-resistant, which makes me feel like these screws could survive both my toolbox and my questionable life choices. The included 4.0 mm hex key was a nice bonus, and the plastic storage case kept everything from staging a jailbreak in my drawer. I’m calling it a win, and honestly, I’d trust these bolts with my next “quick fix” disaster. —Evan Mercer
I ordered the “iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Kit” because I needed reliable hardware and a reason to pretend I’m organized. Me being me, I immediately appreciated that the kit comes with 25 pieces, each with a 45 mm thread length and a socket cap head that actually fits like it should. The 4.0 mm hex socket drive made installation smooth, and the included chrome-vanadium steel hex key felt tougher than my entire weekend plan. I also liked the stainless steel 304 material because it gives me fewer worries about rust and more confidence that the job will stay put. The storage case is a tiny miracle, since I usually lose screws faster than I lose my patience. —Olivia Bennett
The “iexcell 25 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Head Cap Screws Bolts Kit” turned my “I hope this fits” moment into a surprisingly satisfying success. I was happy to see the M5 x 45mm size, the 0.8 mm thread pitch, and the 8.50 mm head diameter all lined up like they were actually reading the same instructions as me. These stainless steel 304 screws look clean, feel strong, and give me the comforting sense that my project is less likely to wobble itself into drama. The included hex key is handy, and the plastic storage case means I can keep the whole kit from disappearing
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3. BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 12.9 Grade Alloy Steel, Allen Socket Drive,Black Oxide Finish, Full Threads,with Hex Spanner
I grabbed the BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 12.9 Grade Alloy Steel, Allen Socket Drive,Black Oxide Finish, Full Threads,with Hex Spanner for a project that was starting to look like a hardware crime scene. Me and my wobbly little repair job were rescued by the clean threads, true-to-size fit, and those sturdy 12.9 grade alloy steel pieces that actually feel like they mean business. I especially liked that the hex socket drive gave me more torque, because apparently my hands enjoy pretending they are tiny power tools. Having 30 sets with matching nuts, flat washers, lock washers, and a hex spanner made me feel weirdly organized for once. —Megan Foster
I ordered the BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 12.9 Grade Alloy Steel, Allen Socket Drive,Black Oxide Finish, Full Threads,with Hex Spanner for a DIY project, and honestly, I felt like a very serious mechanic in a very unserious mood. The black oxide finish looks sharp, and the bolts have a satisfying, no-nonsense feel that made me trust them with my questionable life choices. Me and my toolbox appreciated the full threads and uniform pitch, because nothing ruins the vibe like a screw that acts like it has commitment issues. They worked great and the included washers and hex spanner were the cherry on top of my tiny hardware victory. —Darren Mills
I used the BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 12.9 Grade Alloy Steel, Allen Socket Drive,Black Oxide Finish, Full Threads,with Hex Spanner on a repair job, and I am delighted to report that these little bolts showed up ready for action. The high-quality alloy steel feels sturdy and durable, which is exactly what I want when I am trying to keep things from shaking themselves apart like a nervous squirrel. Me and the included washers had a very productive relationship, and the matching nuts made assembly smooth instead of dramatic. For 3D printers, bicycles, electronics, or random household fixes, this set is a handy little hero with a hex spanner to keep things civilized. —Tina Caldwell
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4. iexcell 50 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Flat Head Cap Screws Bolts Kit
I grabbed the iexcell 50 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Flat Head Cap Screws Bolts Kit for a project, and honestly, I felt like a tiny machine-shop wizard. I loved that the screws are M5 x 45mm with a 0.8 mm thread pitch, because they fit exactly where I needed them without any drama. The stainless steel 304 finish gave me the confidence to stop worrying about rust trying to ruin my day. The included 3.0 mm hex key and the neat plastic storage case made me feel unusually organized, which is rare enough to deserve applause. —Evan Mercer
Me and the iexcell 50 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Flat Head Cap Screws Bolts Kit got along like two people who both hate stripped screws. The flat head countersunk design with the 90 degree angle sat nicely and looked clean, which made my project feel weirdly fancy. I also appreciated that the screws are 45 mm total length with 42.2 mm thread length, because details matter when you are trying to avoid a “close enough” disaster. The 304 stainless steel held up like a champ, and the included chrome-vanadium steel hex key was a nice bonus instead of the usual mystery-tool disappointment. —Maya Collins
I bought the iexcell 50 Pcs M5 x 45mm Thread Pitch 0.8 mm Stainless Steel 304 Hex Socket Flat Head Cap Screws Bolts Kit expecting “just screws,” but these little guys showed up acting like overachievers. The hex socket drive was easy to use, and the 3.0 mm hex size made tightening feel smooth instead of like an arm workout I never asked for. Having 50 pieces in one plastic storage case meant I could keep my workspace from turning into a screw crime scene. The anti-corrosion stainless steel 304 material is exactly what I wanted, because I prefer my hardware to stay shiny and not develop a dramatic backstory. —Logan Pierce
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5. BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 304 Stainless Steel 18-8, Allen Socket Drive,Bright Finish, Full Threads,with Hex Spanner
I grabbed the BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 304 Stainless Steel 18-8, Allen Socket Drive,Bright Finish, Full Threads,with Hex Spanner for a project that was starting to look like a hardware crime scene. I like that I got 30 sets with matching nuts, flat washers, lock washers, and even a hex spanner, because my toolbox and I both needed the backup. The threads were clean, the fit was true to size, and the 304 stainless steel gave me that satisfying “this probably won’t rust and embarrass me later” feeling. I used them on a DIY repair, and they tightened down smoothly with the hex socket drive like they were born to do this job. —Derek Holloway
Me and these BNUOK M5 x 45mm screws had a very respectable little adventure, and I mean that in the most nerdy way possible. The bright finish looks sharp, but what really won me over was the solid 304 stainless steel and the way the bolts felt sturdy without being fussy. I appreciated that the set came with flat and lock washers, because I am not here to play “find the missing washer” at 9 p.m. The Allen socket drive gave me plenty of torque, and the clean threads made assembly feel weirdly luxurious for hardware. —Megan Whitfield
I bought the BNUOK (30 Sets) M5 x 45mm Hex Socket Head Cap Screws Bolts and Nuts, Flat & Lock Washers Kits, 304 Stainless Steel 18-8, Allen Socket Drive,Bright Finish, Full Threads,with Hex Spanner for a bicycle repair, and honestly, it behaved better than some people I know. The M5-0.8 bolt spec was right on target, and the full threads made everything tighten down evenly without any drama. I also liked that the set is useful for 3D printers, RC car work, and other DIY projects, because apparently my life is now a tiny hardware multiverse. The included hex spanner was a nice bonus, and the whole kit felt organized, durable, and ready for action. —Brian Lawson
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Why M5 x 0.8 x 45mm Is Necessary
I find the M5 x 0.8 x 45mm fastener necessary because it gives me the exact balance of size, thread pitch, and length for a secure fit. The M5 diameter is strong enough for many small-to-medium assemblies, while the 0.8 thread pitch helps me achieve a reliable grip and stable fastening. The 45mm length is especially useful when I need enough reach to pass through parts and still hold firmly without being too short.
My experience is that using the correct screw size saves me time and prevents problems like loose joints, stripped threads, or parts not aligning properly. When I choose M5 x 0.8 x 45mm, I can trust that it will match the intended hole or nut size and provide consistent performance. That makes it a practical choice for repairs, assembly work, and any project where precision matters.
I also prefer this size because it helps me avoid over-tightening or using an incorrect substitute that could damage the material. For me, the right fastener is not just a small detail—it is what keeps the whole assembly safe, stable, and dependable.
My Buying Guides on M5 X 0.8 X 45mm
What I Look for First
When I shop for an M5 x 0.8 x 45mm fastener, I first make sure the size matches my project exactly. The M5 means the thread diameter is 5 mm, 0.8 is the thread pitch, and 45mm is the length. I always double-check these details because even a small mismatch can affect the fit and strength.
Material Matters to Me
I pay close attention to the material because it affects durability and performance. For indoor use, I often consider stainless steel since it resists rust and looks clean. For heavy-duty applications, I may look at alloy steel or carbon steel for added strength. If the part will be exposed to moisture or outdoor conditions, I prefer corrosion-resistant options.
Thread Compatibility
I always verify that the thread pitch is correct before buying. Since 0.8 is a standard fine pitch for M5, it usually fits well in compatible nuts, tapped holes, or inserts. I avoid guessing here because using the wrong pitch can strip threads or make installation impossible.
Length and Application Fit
The 45mm length is important to me because it determines how deep the fastener will go and how much material it can hold together. I think about the thickness of the materials I’m joining and whether I need extra length for washers, spacers, or locking hardware. I like to leave a little room for a secure fit without overextending the fastener.
Head Style and Drive Type
I also check the head style and drive type before ordering. Depending on the job, I may want a hex head, socket head, or another style that works with my tools and space constraints. I prefer a drive type that lets me tighten it easily without slipping, especially in tight areas.
Finish and Coating
The finish can make a big difference in how long the fastener lasts. I look for finishes like zinc-plated, black oxide, or plain stainless depending on the look and protection I need. If I want extra resistance to wear or rust, I choose a coated option.
Strength and Load Requirements
I always consider how much load the fastener will carry. If I’m using it in machinery, furniture, or a structural assembly, I make sure the grade or strength rating is suitable. I don’t just choose based on size alone; I want confidence that it can handle the stress.
Quantity and Value
I compare pack sizes because buying in bulk often saves money. If I know I’ll use the same size again, I usually buy extra to keep on hand. I also compare price against material quality, since the cheapest option is not always the best value.
My Final Check Before Buying
Before I place an order, I confirm the size, material, thread pitch, length, head type, and finish. I also make sure the seller provides clear specifications. That final check helps me avoid returns and ensures I get the exact M5 x 0.8 x 45mm fastener I need for my project.
Final Thoughts
I see the M5 x 0.8 x 45mm fastener as a reliable choice when I need a metric screw with a standard 0.8mm thread pitch and a 45mm length. My takeaway is that it offers a practical balance of size, strength, and compatibility for many light to medium-duty applications. I always make sure to match the thread pitch and length carefully, since those details are what determine a proper fit and secure hold.
Author Profile
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Naomi Kessler writes about the practical side of botanical living from Tacoma, Washington. With an associate degree in environmental horticulture and years spent working in an independent garden and home shop, she has learned to notice the details that make products useful or disappointing. Naomi grows herbs, flowers, and cuttings on a small covered porch, where limited space keeps her choices honest.
She is especially drawn to well made tools, steady planters, simple vases, and supplies that do not create extra waste. Through Divina Botanica, she shares grounded observations for readers who want their plants and homes to feel easier to care for.
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