Item Brochure

Lufkin

Steel Tape Line Accuracy

The above illustration shows, for a 100’ tape, the actual length variations of temperature within the range of 20° below to 120°

above zero °F. The terminal graduation on the lower edge is at 68°, this being standard temperature. Standard tension for steel

tapes 25 to 100’ long (10 to 30m) supported entire length on a horizontal, flat surface, is 10 pounds (4.5 kg.); for all tapes over

100’, 20lbs., (9kg.). For steel tapes suspended horizontally and

supported only at ends, there can be no set or standard tension for accuracy because of weight and other variations.

The following listings are averages of many tests made by the N.I.S.T. of Lufkin

steel tapes supported throughout and supported

ends only. These averages are taken from the experience of tests and should be used as a working basis only, and not to

replace the test of any individual tape. All tape lengths are 100’.

NOTE: Temperature and tension need to be taken into account

only on precise work. We recommend a government test of

tapes to be used for such work or for use as master standard.

The N.I.S.T. and Lufkin

have a charge for this test.

Derrick

Cat. UPC no. Blade Size Blade Pack Wt. Shelf Repl. UPC No. Repl. UPC No.

No. 037103 Packed Width Length Style lb kg Pack Blade 037103 reel 037103

C2276D 454713 Boxed 1/4” 100’ E1 2.87 1.3 1 OC2276D 454720 - -

C2276ME 454737 Boxed 1/4”(6mm) 100’(30m) E2 2.87 1.3 1 OC2276ME 454744 - -

CD2730DMM 063700 Boxed 6mm 30m E12 2.87 1.3 1 OCD2730DMM 063717 - -

CD2750MME 063687 Boxed 1/4”(6mm) 164’(50m) E13 3.29 1.49 1 - - 12200 450340

• Chrome Clad

blade

• Nominal blade thickness .019”

• Extra large winding drum provides rapid line recovery

and permits tape line to be easily detached from reel

• Special hook ring with ribbed face at zero

• Leather thong is provided to use through eye at rear

when tape is removed from reel

Tension of Supported

Width tape accuracy ends only

inches Kind of tape thru-out in lbs. in lbs.

1/4 Chain tapes 10 24

1/4 Engineer’s (.012”) tapes 10 18

1/4 Engineer’s Extra Heavy Tapes 10 24

3/8 & 1/2 Standard Weight Tapes 10 18

Lufkin

steel tapes are made to government standards. Our bench standards for the United States are certified accurate by the

United States Department of Commerce, N.I.S.T. Tapes for Canada are made to Canadian government standards.

Temperature standard for steel tapes is 68°F, which equals 20°C. Coefficient of ex pansion of steel tapes is 0.00000645’ per

degree F; 0.0000116’ per degree C. This amounts to 0.000645’ or 0.00774” per degree F. on a 100’ tape, and one-half as much

on a 50’ tape. As a figure that is reasonably accurate and also easy to handle, it is customary on very long runs of pipe to allow

1/10” per 100’ for each 10° change.

C2276D

SURVEYING TAPES