Spaenaur

L • 9 ® Fastening System
Système d'attache L • 9 ®
CHART 1 - GUIDE FOR ASSEMBLY TORQUE
Based on using one L • 9 hex bolt and one L • 9 hex nut
with two L • 9 washers (one under the bolt head, one
under the nut) with “as supplied” finishes.
NOMINAL CLAMP TORQUE BY TORQUE
SIZE LOAD BOLT HD.* BY NUT*
INCHES LBS. (FT-LBS) FT-LBS)
1/4-20 3,450 10 11
1/4-28 3,950 12 13
5/16-18 5,700 19 21
5/16-24 6,300 20 23
3/8-16 8,450 30 33
3/8-24 9,550 35 38
7/16-14 11,550 55 60
7/16-20 12,900 60 65
1/2-13 15,450 85 95
1/2-20 17,400 95 105
9/16-12 19,800 120 140
9/16-18 22,100 135 150
5/8-11 24,550 170 185
5/8-18 27,800 190 205
3/4-10 36,350 265 290
3/4-16 40,600 330 355
7/8-9 50,300 475 505
7/8-14 55,400 520 585
1-8 65,900 550 775
1-14 73,800 700 900
1-1/8-7 83,000 1,025 1,150
1-1/8-12 93,100 1,150 1,325
1-1/4-7 105,400 1,400 1,600
1-1/4-12 116,700 1,600 1,750
1-1/2-6 152,800 2,900 3,250
1-1/2-12 171,900 3,300 3,650
*Nut and bolt assembly - NOT tapped hole
HARDNESS SPECIFICATIONS CHART
Bolt Head marked
with L • 9 and nine radial
lines to assure
identification.
L • 9 hardened washers
provide smooth
bearing surfaces
and uniform load
distribution. They
will not dish or cup
in service.
CHART 2 - L • 9 DESIGN DETAILS
Washer face under head eliminates
corner drag when head wrenching.
Radiused filler reduces stress
concentration at juntion of shank and head.
Notch effect of threads reduces
by radius-root threads.
Thicker than standard Hex Heads and
Nuts provide additional wrench surface
(See Chart 6).
*IMPORTANT: Torque values do not apply when L • 9 washers are omitted, or if any of the
L • 9 system components are substituted, or if finish, as supplied, is altered in any way
(including addition of lubricant). These torque values are average values established under
laboratory test conditions. Actual results in individual applications may vary by ±15%. This
variation is in accordance with accepted industry standards. When L • 9 hex screws with
tension washers are used in tapped holes, above torque values may require adjustment to
compensate for variables, such as joint material hardness, depth of thread engagement,
internal thread condition, etc.
The L • 9 system must be used as a complete system, with no substitutes or alterations of
components or finishes (including lubrication). Substituting or altering any component, or
altering the “as supplied” finishes can cause fastener or joint failure.
PLATING SPECIFICATIONS CHART
Chamfers on nut
bearing faces
eliminate corner
drag.
Nuts also marked
with nine radial
lines or circumferential
dashes to
assure identification.
Zinc plated and dichromated
bolts, in combination with zinc
plated and waxed nuts, provide
resistance to corrosion and
controlled lubrication for
uniform tightening.
B
Bolts All diameters Rockwell C38-42
Nuts 1/4 thru 5/8 Rockwell C28-34
3/4 thru 1-1/2 Rockwell C32-38
Washers Rockwell 15N 82-85
CLAMP LOAD EXCEEDS
EXTERNAL LOAD CHART
PRODUCT TYPE PLATE THICK. OF PLATE-INCHES BAKE FINISH
Bolts Zinc .0002-.0004 6 Hours @ 375-425°F Yellow Dichromate
Nuts & Washers Zinc .0002-.0004 6 Hours @ 375-425°F Yellow Dichromate
NOTE: These specifications exceed the requirements of ASTM B633 Fe/Zn 5, Type ll
(Zinc) and B766, Class 5, Type ll (Cadmium).These finishes will meet a 96-hour salt spray
test as specified by ASTM B117.
L • 9 BOLT STRENGTH SPECIFICATIONS CHART
UNRC - 2A COARSE THREAD
UNRF - 2A FINE THREAD
CATALOG 13
To reduce possibility of fatigue failure, make
sure bolt tension exceeds the known or
estimated maximum dynamic load. In this
way, the bolt’s life under dynamic loading
will approach its life under static loading.
NOMINAL THREADS TENSILE PROOF THREADS TENSILE PROOF
DIAMETER-IN. PER INCH STRENGTH-LBS. LOAD-LBS. PER INCH STRENGTH-LBS. LOAD-LBS.
1/4 20 5,720 4,610 28 6,550 5,270
5/16 18 9,430 7,590 24 10,440 8,410
3/8 16 13,950 11,230 24 15,800 12,730
7/16 14 19,130 15,410 20 21,360 17,210
1/2 13 25,540 20,570 20 28,780 23,180
9/16 12 32,760 26,390 18 36,540 29,430
5/8 11 40,680 32,770 18 46,080 37,120
3/4 10 60,120 48,430 16 67,140 54,080
7/8 9 83,160 66,990 14 91,620 73,800
1 8 109,080 87,870 14 122,220 98,450
1-1/8 7 137,340 110,630 12 154,080 124,120
1-1/4 7 174,420 140,500 12 193,140 155,580
1-1/2 6 252,900 203,720 12 284,580 229,240
Tensile Strength Values - based on 180,000 psi minimum. Yield Strength - 155,000 psi
minimum. Proofload Strength Values - based on 145,000 psi minimum.
See additional L • 9 ®
information - page B182.
Tel: 1-800-265-8772 Fax: 519-744-0818
B177