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Bolt 5/16 x 4 Hx Lag Blt 18-8 SS (1000 pcs)
Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Bolts
Metallics BLS16SSB – Frequently Asked Questions
1) Are these 5/16 x 4 lag bolts stainless, and can they be used outdoors or in wet locations?
They are 18-8 stainless steel, the standard 300-series austenitic stainless used for corrosion resistance. That makes the BLS16SSB suitable for exterior and damp installations where a plain or zinc-plated lag would rust, such as deck framing, exterior equipment mounts, and coastal or wash-down areas. 18-8 is not hardened like a Grade 5 steel lag, so it trades some strength for corrosion resistance.
2) What size wrench or socket do I need to drive a 5/16 inch hex lag bolt?
A 5/16 inch hex head lag screw takes a 1/2 inch wrench or socket across the flats. Drive it with a socket and impact or ratchet, not a screwdriver, since the BLS16SSB is a hex head lag rather than a slotted or driver-bit fastener.
3) Do I need to pre-drill a pilot hole for 5/16 x 4 inch stainless lag screws?
Yes. Lag screws in this diameter should be installed in a pilot hole in solid wood, otherwise the wood splits or the head twists off. That matters more with 18-8 stainless than with hardened steel lags, because stainless is softer and galls more readily when driven dry under high torque. Clamping pressure comes from the threads biting the second member, so bore the clearance hole through the first member and the pilot into the holding member.
4) Will stainless lag bolts react with aluminum or galvanized brackets?
18-8 stainless in direct contact with aluminum or galvanized steel in a wet location sets up galvanic corrosion, and the aluminum or zinc is what gives way. Where the BLS16SSB goes through aluminum strut, flashing, or galvanized plate outdoors, isolate with a nylon or neoprene washer, or match the fastener material to the bracket instead.
5) Can I use these lag bolts to mount electrical equipment and conduit supports?
That is the intended use. These Metallics lag bolts are stocked as electrical fasteners, and a 5/16 x 4 stainless hex lag is the common anchor for strut, conduit clamps, junction box backings, and exterior fixture mounts fastened into wood framing or blocking. For masonry you need a sleeve or wedge anchor instead, since a lag screw needs either wood or a lag shield.
6) Does the BLS16SSB come with nuts or washers?
No. It is a lag bolt, which threads directly into wood and takes no nut. The 1,000-piece box of BLS16SSB is bolts only, so order flat washers separately if you want bearing area under the hex heads, and match them in 18-8 stainless so you do not pair a stainless lag with a plated washer outdoors.
How fast can I get the Metallics BLS16SSB delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics BLS16SSB come with a warranty?
Absolutely. The Metallics BLS16SSB is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics BLS16SSB?
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