screws, nuts & bolts

[badkuk]

i'm the kinda guy na kada bukas ng engine hood e merong nawawalang screw/nut/bolts. san makakahanap ng spare? my instinct say hardware store, pero parang magkaiba ata ung pambahay sa pang oto na screws/nuts/bolts

[rapeez]

dude, IMO hi-tensile use for car.

[badkuk]

sorry, i'm not sure i follow...hi-tensile nuts/bolts/screws?

[GoThicbLuE]

Punta ka ng recto, sa T. Mapua, maraming bilihan ng kahit anong screws doon. for industrial use dun ako bumibili ng gamit nung may machine shop pa ko.

[GoThicbLuE]

Sorry nakalimutan ko Tonsuy ang store name nung isa tatlo yun iisa mayari....

[khayib]

To Suy sa may T. Mapua. You must know the size and thread pitch.

[jackaroo]

San juan area, try Y2K along pinaglabanan near N domingo st.

[xpac]

parang meron sa concorde.

[yebo]

yung mga bolts na nasa labas ng engine parehas lang yan ng mabibili mo sa ordinary hardware. ordinary bolts, nuts and screws lang mga yan. usually walang markings yan sa head, basically grade 1 bolts.

ang mga bolts sa loob ng engine, like cylinder head bolts, rocker arm bolts, connecting rod bearing cap bolts, main bearing cap bolts, etc etc ay special bolts. high grade high temperature bolts mga yan, usually grade 8 high temp. ma-distinguish mo yan sa marking dun sa bolt head - ang grade 8 high temp bolt ay may 6 na lines na parang asterisk (*) and dun sa center ng asterisk may triangle.

grade 3 = 1 line sa head ng bolts, very very uncommon.
grade 4 = 2 lines (parang V pero di magkaduktong yung line), also not commonly used.
grade 5 = 3 lines na parang Y pero di rin magkaduktong yung lines. this is the most common bolt used in automotive chasis and mountings, and also the most common industrial bolt/screw.
grade 6 = 4 lines na parang X, di magkaduktong yung mga lines
grade 7 = 5 lines na parang asterisk pero 5-pointed lang
grade 8 = 6 lines parang asterisk (*)

a triangle in the center of the bolt head means high temp (triangle means "fire" or "heat" in chemistry, remember?)

pag japanese or european ang car mo then it will most probably be a metric thread bolt, that is the bolt size is expressed in millimeters. the thread pitch is expressed in threads/10 mm, or sometimes in millemeters/thread.

pag american car then it will be in asme thread size, or inches. size is expressed in diameter X threads/inch, like 1/2x13 UNC, meaning 1/2 inch diameter x 13 threads/inch coarse pitch thread. or 1/2X18 UNF, meaning 1/2 inch diameter x 18 threads/inch fine pitch thread.

usually pag high tension applications ay fine pitch thread ang gamit dahil mas maliit kasi ang lead angle ng thread so mas mataas ang torque rating (a higher lead angle tends to make the bolt loose under tension).

[jackaroo]

yebo
Great info.
Do stainless bolts come in these different grades?
What's the usual type of metal used for the special bolts?

[5Speed]

agree ako sa mga sinabi ni ser yebo...hehehe

teka, mechanical engineer ka ba ser yebo? yang sagot mo kasi eh parang kaparehas nung isa kong dating kaopisina na dito na ME eh....hehehe yun ang tanungan namin nang mga turnilyo at kung anu-anong metal na may gear na ginagamit namin sa project....hehehe


BTW stainless steel bolts have different grades....and different grades din sa bawat location/country. me British, American, Japanese...etc....

[pajerokid]

auto supply lang katapat niyan, but of course you do have to match the bolt strenghts as yebo mentioned.

Sa Eldorado cubao, lahat ng turnilyo pang Mitsu meron.

[badkuk]

5speed:BTW stainless steel bolts have different grades....and different grades din sa bawat location/country. me British, American, Japanese...etc....

re grading...my bro once mentioned that stainless steel itself(not necessarily nuts and bolts) have difference grades...some lower grade ssteel are used on sinks n other fixtures...ung highest grade steel naman ginagamit for surgery n stuff...virtually corrosion resistant....

[boyscout]

yung mga plastic screws sa loob ng engine bay iba rin ba yon sa ordinary plastic screws?