We love Spitz etc. Great for going down. Not so great for going up. Cost ~£1.50
Can we find somewhere to buy the ~100 cones we need to complete our Bivvi collection?
Hilti HKD-S
10mm hole, wedge set by driver that passes through standard M8 thread, as used by CUCC since 1990.
Not a problem if hole too deep.
http://cucc.survex.com/expo/years/1990/drill.htm
via. Ukcaving forum: HKD-S (Plain steel) - M8 x 30 = 11.65+ VAT /100
Jarv Notes: Thinner walls than spits, only 1 deep ridge vs. 3 on true spit. Seems a bit of a halfway house?
Through Bolts (Aka suicide bolts)
According to Inglethief, standard is:
"10mm dia. x 90mm stainless steel through bolts, norm for climbing 8mm dia. x 100mm"
Suicide bolts cheap from hardware manufac:
Q. Can we get normal hangers for these? Commercially available seem to be for 8/10mm bore.
Q. What is the strength of a bolt, wrt. diam and length? Proportional to Diam^2 * length ? Or far far more complex?
Energy to drill hole should be proport. diam^2 * length.
Q. Worth getting a 6mm SDS drill bit, or using current 8mm with 'pecker / electric drill?
My feeling is that up-climbing / suicide may as well be mild steel, but stainless is best for any M8x100 etc. used to rig.
So should we make it so suicide bolts = 6mm steel, all 8mm are 100mm stainless? Or risk mixing the two types for standardisation of diameter?
Sane:
- 8mm x 100mm = 6400 units of strength
- 10mm x 90mm = 9000
Suicide:
- M8x50 = 3200
- M6x40 = 1440
- M6 (easily) available in 40,45,55,70,85,95
- M8 in 50,65,80,100,105,120
Costs:
- M6x40 Zinc: 7p,
- M8x50 Zinc: 10p, M8x100 Zinc: 14p
- M8x100 Stainless: 75p (implies ~identical to the Inglethief price, once included 100% markup for 'outdoor equipment')
Costs scoped from PVRDIRECT web catalogue linked below 30-12-07
Nb: Gladiator's wire was rigged off M18s (depth unspecified), ref. The Hollow Mountain p.94
http://www.pvrdirect.co.uk/products.aspx?tier1=Fixings&tier2=Rawl+Bolts+Fixings&tier3=Throughbolts+-+Zinc+%26+Yellow&cmd=list Zinc/Steel
http://www.pvrdirect.co.uk/products.aspx?id=-1&tier1=Fixings&tier2=Rawl+Bolts+Fixings&tier3=Throughbolts+-+Stainless+Steel Stainless. Boxes of 50/100.
