A Hobart SC-129-91 Screw supports secure component alignment while allowing controlled movement for steady performance.
The screw holds and aligns connected components at a fixed spacing so moving or mounted parts can operate in the correct position. Its shoulder design and precise 5/16" diameter by 1" length matter because they provide controlled bearing surface, consistent fit and stable support under repeated equipment use.
The screw could need to be replaced if the equipment develops looseness, misalignment, vibration or uneven movement during operation. Physical signs can include worn threads, a bent shank or scoring on the shoulder, while environmental signs may include rust, corrosion or residue buildup that can affect fit and performance.
We provide same-day shipping on in-stock real OEM replacement parts Monday—Friday until 9 PM ET, as well as on Saturday until 4 PM ET for online air orders. Orders placed after the cutoff times are processed and shipped the next business day.
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Yes! Customer support for real OEM parts is available 8 AM to 9 PM ET Monday—Friday with chat, email and phone among the options. Go to our Contact Us page to see our contact details.
Absolutely! Customers are able to return most new, unopened real OEM parts within 90 days of delivery, so go to our Returns page for more information on the policy. For parts that have been installed and no longer work, fill out the form in the Defective Parts & Warranty Inquiries section.