Determining Hardness on a Socket Head Cap Screw
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Outstanding HDF Member
Joined: Oct 2008
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From: Northern Illinois
Determining Hardness on a Socket Head Cap Screw
I've got some Chrome Socket Head Cap Screws that I think are Grade 8 but I'm not sure.
How do I tell?
On a regular hex Head Bolt, there would be 6-hash marks, but there's nothing on the Socket Head Cap Screws except the letters Y F S
Anyone know?
How do I tell?
On a regular hex Head Bolt, there would be 6-hash marks, but there's nothing on the Socket Head Cap Screws except the letters Y F S
Anyone know?
Road Warrior
Joined: Nov 2008
Posts: 1,595
Likes: 8
From: Vancouver Island British Colombia Canada
Cap screw?.......... If it's small enough that a 1/4 inch drive ratchet can be used, it will only be grade #2. Does your manual give a torque setting? if it's in inch pounds, the strength will be low. If it's in foot pounds, I think they start at around #5.
Hatch.
Hatch.
Cruiser
Joined: Oct 2011
Posts: 139
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From: Pennsylvania
I work with fasteners all the time, to my knowledge all SHCS (a bolt that takes a hex wrench (allen) to tighten) are manufactured from alloy steel and considered grade 8. Just so you know that makes them very brittle if they are in shear (they don't bend, they break) but very strong if they are in a clamp (tension) application. When they are chrome plated, the plater uses a heated chemical bath but not hot enough to anneal (soften) the bolts.
Unofficial HDF Chaplain
Joined: Dec 2009
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From: san diego
theres nothing that you're putting chrome bolts on that has to be all that tight. (80 lbs & up) even the case bolts are only 35ft lbs (give or take) don't worry about it. I have EVERY bolt on my deuce chrome cap screws and never had any problem, its a non issue. You're screwing it ,into aluminum it cant take all that much torque anyhow
Last edited by harleycharlie1992; Dec 26, 2011 at 08:15 PM.
Seasoned HDF Member
Joined: Dec 2004
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From: Texas! Ya mean there's someplace else?
YFS is the Fang Sheng Screw Company. They're in Taiwan and make some high quality stuff, mostly metric. It's probably a Grade 8, as they say their socket head cap screws are made of an alloy steel. Usually a Grade 5 or Grade 2 will just say carbon steel.
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Outstanding HDF Member
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From: Northern Illinois
I work with fasteners all the time, to my knowledge all SHCS (a bolt that takes a hex wrench (allen) to tighten) are manufactured from alloy steel and considered grade 8. Just so you know that makes them very brittle if they are in shear (they don't bend, they break) but very strong if they are in a clamp (tension) application. When they are chrome plated, the plater uses a heated chemical bath but not hot enough to anneal (soften) the bolts.
Thanks, that makes a lot of sense, just wish they're was a marking on them so you could tell for sure. The bolts are for the Floorboard Brackets (tension). The OEM Harley bolts say Grade 8 if I recall correctly. I am replacing the OEM bolts with Chrome bolts that are a little longer.
Floorboard Brackets
Believe it or not, the bolts I am asking about came from a Harley dealer, and they came out of the "Harley Book". Kind of a shame they're selling bolts from Taiwan. The parts guy just wasn't sure what grade they were. I'm replacing Grade 8 bolts from the Floorboard Brackets, and just want to make sure the replacement bolts are just as strong as the OEM's.
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From: navarre ohio
i worked in a bike shop..most of the chrome bolts we got said they were grade 5.. they might just be under grading them to be safe after the polishing and chemical treating of chromeing them.. most things using chrome bolts don't need gr8. the only bolts that need to be grade 8 are axles, floorboards, brakes, headbolts.. on them items it is a pretty good bet they are going to use the rite bolts for liability issues..
Seasoned HDF Member
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From: Billings,Mt.
From Fastenal.........
Fastenal Product Specification Sheet
Alloy Steel Socket Head Cap Screws
Mechanical/Chemical Specification ASTM A574
Material Alloy Steel
Treatment Quenched and Tempered
Min Tensile #0 thru 1/2 in. 180,000 PSI
(See Mechanical Strengths) over 1/2 thru 2 in. 170,000 PSI
Proof Load #0 thru 1/2 in. 140,000 PSI
over 1/2 thru 2 in. 135,000 PSI
Min Yield 153,000 PSI (* required when equipment is not available for full-size testing)
Core Hardness #0 thru 1/2 in. Rockwell C39 to C45
over 1/2 thru 2 in. Rockwell C 37 to 45
Dimensions ANSI/ASME B18.3 (See Socket Head Cap Screw Dimensions)
Threads Class 3A, UNRC and UNRF series #0 thru 1-in.
Class 2A, UNRC and UNRF series over 1 thru 1-1/2 in.
Class 2A, UNRC series over 1-1/2 in.
Description/ Applications The socket head cap screw is an internally wrenched fastener designed for high tensile strength applications. Supplies greater tensile strength than equivalent size grade 5 or 8 hex cap screws. They are ideal for precision work with close tolerance and applications needing a well tooled appearance. Primarily they are used in tool and die fixturing applications because the head can be counterbored into a work piece to provide a smooth or flat surface.
Fastenal Product Specification Sheet
Alloy Steel Socket Head Cap Screws
Mechanical/Chemical Specification ASTM A574
Material Alloy Steel
Treatment Quenched and Tempered
Min Tensile #0 thru 1/2 in. 180,000 PSI
(See Mechanical Strengths) over 1/2 thru 2 in. 170,000 PSI
Proof Load #0 thru 1/2 in. 140,000 PSI
over 1/2 thru 2 in. 135,000 PSI
Min Yield 153,000 PSI (* required when equipment is not available for full-size testing)
Core Hardness #0 thru 1/2 in. Rockwell C39 to C45
over 1/2 thru 2 in. Rockwell C 37 to 45
Dimensions ANSI/ASME B18.3 (See Socket Head Cap Screw Dimensions)
Threads Class 3A, UNRC and UNRF series #0 thru 1-in.
Class 2A, UNRC and UNRF series over 1 thru 1-1/2 in.
Class 2A, UNRC series over 1-1/2 in.
Description/ Applications The socket head cap screw is an internally wrenched fastener designed for high tensile strength applications. Supplies greater tensile strength than equivalent size grade 5 or 8 hex cap screws. They are ideal for precision work with close tolerance and applications needing a well tooled appearance. Primarily they are used in tool and die fixturing applications because the head can be counterbored into a work piece to provide a smooth or flat surface.
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